Best Project first:
If you have multiple projects and limited resources, you need to choose the project that will be the most successful or Get the best bang for the buck.
What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities.
#2, Encourage Non-Amateur-radio people to possibly get-into the Amateur-Radio or SWL Hobby.
#3, Get more people excited about the ISS and is open programs that can allow the average person to participate.
#4, Provide the ISS crew with some entertaining and excitement about their projects.
#5, Language universal projects work best.
The APRS project has a low following and does not generate much excitement or newspaper coverage.
SSTV does great and all 5 of the listed categories.
Why is SSTV better the APRS?
SSTV is a project that will cross over between two hobbies,Short-wave-listening and Amateur radio.Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals.
With 10's of millions of SWL+AR stations receiving these signals month after month, you will see a huge interest in the abilities of Amateur Radio on ISS.
You must have heard the saying "A picture is worth a thousand words".
When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS?Never!
The MarexMG SSTV project was a huge hit.Schools around the world were setting up receiving stations to receive the images.I remember seeing a new story showing how the Great-Lakes ices was changing week after week, based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project front and center.
I am not talking about turning on SSTV for 1 or two weekend per year.
I am talking about turning it on for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
Image cycle duration:
Let's keep is Simple and Safe.
Recommended format:
To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image.I know this is the lowest quality image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity!
And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi.
Maximum number of ISS-transmitted images per hour.
1 image every 5 minutes or 20 per hour.And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV.
Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
We have both. To receive SSTV, the APRS PSAT2 satellite supports it full time with an SSTV image once every 4 minutes full time 24/7/365.on 435.350 MHz.
In addition, users can also uplink their own images to the SSTV transponder on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected] wrote:
Best Project first: If you have multiple projects and limited resources, you need to choose
the project that will be the most successful or Get the best bang for the buck.
What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the
Amateur-Radio or SWL Hobby.
#3, Get more people excited about the ISS and is open programs that can
allow the average person to participate.
#4, Provide the ISS crew with some entertaining and excitement about
their projects.
#5, Language universal projects work best.
The APRS project has a low following and does not generate much
excitement or newspaper coverage.
SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals month
after
month, you will see a huge interest in the abilities of Amateur Radio on
ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember
seeing
a new story showing how the Great-Lakes ices was changing week after week, based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project
front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a row
24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image. I know this is the lowest
quality
image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14
psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day,
7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
"And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi." - I thought if there was a spacewalk ALL amateur radio transmissions would be turned off.
Rick WB3CSY
On Mon, Jul 19, 2021 at 1:14 PM GMM via AMSAT-BB [email protected] wrote:
Best Project first:
If you have multiple projects and limited resources, you need to choose the project that will be the most successful or Get the best bang for the buck.
What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities.
#2, Encourage Non-Amateur-radio people to possibly get-into the Amateur-Radio or SWL Hobby.
#3, Get more people excited about the ISS and is open programs that can allow the average person to participate.
#4, Provide the ISS crew with some entertaining and excitement about their projects.
#5, Language universal projects work best.
The APRS project has a low following and does not generate much excitement or newspaper coverage.
SSTV does great and all 5 of the listed categories.
Why is SSTV better the APRS?
SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals.
With 10's of millions of SWL+AR stations receiving these signals month after month, you will see a huge interest in the abilities of Amateur Radio on ISS.
You must have heard the saying "A picture is worth a thousand words".
When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember seeing a new story showing how the Great-Lakes ices was changing week after week, based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project front and center.
I am not talking about turning on SSTV for 1 or two weekend per year.
I am talking about turning it on for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
Image cycle duration:
Let's keep is Simple and Safe.
Recommended format:
To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image. I know this is the lowest quality image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity!
And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi.
Maximum number of ISS-transmitted images per hour.
1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV.
Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
@WB4APR I didn't know that! When I read about the satellite initially I thought that you only got an SSTV image if someone was transmitting one. I didn't realize that it constantly transmitted what was in it's memory (at least I'm guessing that). I'm going to try that ASAP and let my club know too. Thanks! -David, N9KT
On Mon, Jul 19, 2021 at 1:43 PM Robert Bruninga [email protected] wrote:
We have both. To receive SSTV, the APRS PSAT2 satellite supports it full time with an SSTV image once every 4 minutes full time 24/7/365.on 435.350 MHz.
In addition, users can also uplink their own images to the SSTV transponder on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected] wrote:
Best Project first: If you have multiple projects and limited resources, you need to choose
the project that will be the most successful or Get the best bang for the buck.
What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the
Amateur-Radio or SWL Hobby.
#3, Get more people excited about the ISS and is open programs that can
allow the average person to participate.
#4, Provide the ISS crew with some entertaining and excitement about
their projects.
#5, Language universal projects work best.
The APRS project has a low following and does not generate much
excitement or newspaper coverage.
SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals month
after
month, you will see a huge interest in the abilities of Amateur Radio on
ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember
seeing
a new story showing how the Great-Lakes ices was changing week after
week,
based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project
front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a
row 24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image. I know this is the lowest
quality
image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi
[Usually
during space walks], the radio will also run hotter at 10 psi, than at
14 psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day,
7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Hi Rick:
Its is possible that most of the optional radios are turned off during a space walk.
I am not sure if Ham radio is on the Turn-off list.
Originally the 4x Ham antennas all contained a Patch antenna that was going to be used for external spacesuit helmet cameras
transmitting in the GHZ band. I am not sure if the ham GHZ antennas were actually used for video.
Each antenna is on a different side of Service module, providing good line of site access to the crew during a space walk.
Does anyone know if the existing Ham Patch antennas were ever use for helmet cameras inflight?
More trivia/details on the air pressure.
It is not possible to go from 14psi to 5psi quickly, without suffering from the Bends.
The space suits run at 4.3 psi.
If the pressure was much higher the arms would inflate so much they would be impossible to bend your arms.
The station is gradually de-pressurized from 14 to 10 psi a day or so before a spacewalk.
This allows the whole crew to depressurize to 10 psi.
Then the space walk crew breath pure O2 for an hour or so to get more nitrogen out of their systems.
Next the airlock is closed and the space walk crew de-pressurize the room from 10 to 0, but the suite, only goes down to 4.3 and hopefully no lower.
On 7/19/21 3:49 PM, Rick Walter wrote:
"And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi." - I thought if there was a spacewalk ALL amateur radio transmissions would be turned off.
Rick WB3CSY
My understanding is that the Ham stations are both turned off during space walks, dockings, and other externally significant activities.
Greg KO6TH
GMM via AMSAT-BB wrote:
Its is possible that most of the optional radios are turned off during a space walk.
I am not sure if Ham radio is on the Turn-off list.
The only downside is that its orbit is at a 28 degree latitude and so is low on the southern horizon for northern states. Though the elevation goes up and down over a two week period by several degrees.
Let me know that it is working. Oh, also, the pass has to be in the sun for power and for live images. bob
On Mon, Jul 19, 2021 at 4:03 PM David Spoelstra [email protected] wrote:
@WB4APR I didn't know that! When I read about the satellite initially I thought that you only got an SSTV image if someone was transmitting one. I didn't realize that it constantly transmitted what was in it's memory (at least I'm guessing that). I'm going to try that ASAP and let my club know too. Thanks! -David, N9KT
On Mon, Jul 19, 2021 at 1:43 PM Robert Bruninga [email protected] wrote:
We have both. To receive SSTV, the APRS PSAT2 satellite supports it full time with an SSTV image once every 4 minutes full time 24/7/365.on 435.350 MHz.
In addition, users can also uplink their own images to the SSTV transponder on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected] wrote:
Best Project first: If you have multiple projects and limited resources, you need to choose the project that will be the most successful or Get the best bang for the buck. What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the Amateur-Radio or SWL Hobby. #3, Get more people excited about the ISS and is open programs that can allow the average person to participate. #4, Provide the ISS crew with some entertaining and excitement about their projects. #5, Language universal projects work best.
The APRS project has a low following and does not generate much excitement or newspaper coverage. SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals month after month, you will see a huge interest in the abilities of Amateur Radio on ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember seeing a new story showing how the Great-Lakes ices was changing week after week, based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image. I know this is the lowest quality image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
I can vouch for PSAT and SSTV with PSK however like Bob says it is very hard from the more Northern latitudes. N8URE and I did an experiment last year. I was able to receive waterfall text and some BW SSTV from Maryland and received in Florida. It took many weeks of troubleshooting however.
On Mon, Jul 19, 2021 at 7:28 PM Robert Bruninga [email protected] wrote:
The only downside is that its orbit is at a 28 degree latitude and so is low on the southern horizon for northern states. Though the elevation goes up and down over a two week period by several degrees.
Let me know that it is working. Oh, also, the pass has to be in the sun for power and for live images. bob
On Mon, Jul 19, 2021 at 4:03 PM David Spoelstra [email protected] wrote:
@WB4APR I didn't know that! When I read about the satellite initially I
thought that you only got an SSTV image if someone was transmitting one. I didn't realize that it constantly transmitted what was in it's memory (at least I'm guessing that). I'm going to try that ASAP and let my club know too.
Thanks! -David, N9KT
On Mon, Jul 19, 2021 at 1:43 PM Robert Bruninga [email protected]
wrote:
We have both. To receive SSTV, the APRS PSAT2 satellite supports it
full time
with an SSTV image once every 4 minutes full time 24/7/365.on 435.350
MHz.
In addition, users can also uplink their own images to the SSTV
transponder
on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected]
wrote:
Best Project first: If you have multiple projects and limited resources, you need to
choose the project that will be the most successful or Get the best bang for the buck.
What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the
Amateur-Radio or SWL Hobby.
#3, Get more people excited about the ISS and is open programs that
can allow the average person to participate.
#4, Provide the ISS crew with some entertaining and excitement about
their projects.
#5, Language universal projects work best.
The APRS project has a low following and does not generate much
excitement or newspaper coverage.
SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals
month after
month, you will see a huge interest in the abilities of Amateur Radio
on ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out
SSTV
images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember
seeing
a new story showing how the Great-Lakes ices was changing week after
week,
based on images from Mir SSTV.
If we want to build up a large amount of support for existing and
future
Amateur radio projects on ISS, then we need to put our best project
front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a
row 24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting
time
is only about 36 seconds for each image. I know this is the lowest
quality
image format, but since it’s the shortest, we can keep the radio
cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi
[Usually
during space walks], the radio will also run hotter at 10 psi, than
at 14 psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day,
7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views
of AMSAT-NA.
Acceptable Use and Privacy Policies available at
https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Automatic SSTV images are working. I decoded one a few days ago. APRS to voice is also working.
Some clarifications: The Ham radios are switched off during EVAs.
The ISS is always controlled to 14.7 PSI. The EVA prebreathe procedure on the shuttle reduced the cabin pressure to 10.2 PSI, but this is not possible on ISS. There was a campout procedure where the EVA crewmembers sleep in the ISS airlock at reduced pressure, but this method hasn't been used for years. The current protocol is ISLE (in-suit, light exercise) with a fallback to a 4-hour in-suit prebreathe.
73, Keith (NASA Flight Surgeon)
Keith E Brandt, WD9GET
*This message transmitted with 100% recycled DHMO-free electrons
xb
On 19-Jul-21 15:49, GMM via AMSAT-BB wrote:
Hi Rick:
Its is possible that most of the optional radios are turned off during a space walk.
I am not sure if Ham radio is on the Turn-off list.
Originally the 4x Ham antennas all contained a Patch antenna that was going to be used for external spacesuit helmet cameras
transmitting in the GHZ band. I am not sure if the ham GHZ antennas were actually used for video.
Each antenna is on a different side of Service module, providing good line of site access to the crew during a space walk.
Does anyone know if the existing Ham Patch antennas were ever use for helmet cameras inflight?
More trivia/details on the air pressure.
It is not possible to go from 14psi to 5psi quickly, without suffering from the Bends.
The space suits run at 4.3 psi.
If the pressure was much higher the arms would inflate so much they would be impossible to bend your arms.
The station is gradually de-pressurized from 14 to 10 psi a day or so before a spacewalk.
This allows the whole crew to depressurize to 10 psi.
Then the space walk crew breath pure O2 for an hour or so to get more nitrogen out of their systems.
Next the airlock is closed and the space walk crew de-pressurize the room from 10 to 0, but the suite, only goes down to 4.3 and hopefully no lower.
On 7/19/21 3:49 PM, Rick Walter wrote:
"And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi." - I thought if there was a spacewalk ALL amateur radio transmissions would be turned off.
Rick WB3CSY
Barb, please remind us what SSTV mode is used on NO104?
Sent from my iPhone
On Jul 19, 2021, at 18:28, Robert Bruninga [email protected] wrote:
The only downside is that its orbit is at a 28 degree latitude and so is low on the southern horizon for northern states. Though the elevation goes up and down over a two week period by several degrees.
Let me know that it is working. Oh, also, the pass has to be in the sun for power and for live images. bob
On Mon, Jul 19, 2021 at 4:03 PM David Spoelstra [email protected] wrote:
@WB4APR I didn't know that! When I read about the satellite initially I thought that you only got an SSTV image if someone was transmitting one. I didn't realize that it constantly transmitted what was in it's memory (at least I'm guessing that). I'm going to try that ASAP and let my club know too. Thanks! -David, N9KT
On Mon, Jul 19, 2021 at 1:43 PM Robert Bruninga [email protected] wrote:
We have both. To receive SSTV, the APRS PSAT2 satellite supports it full time with an SSTV image once every 4 minutes full time 24/7/365.on 435.350 MHz.
In addition, users can also uplink their own images to the SSTV transponder on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected] wrote:
Best Project first: If you have multiple projects and limited resources, you need to choose the project that will be the most successful or Get the best bang for the buck. What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the Amateur-Radio or SWL Hobby. #3, Get more people excited about the ISS and is open programs that can allow the average person to participate. #4, Provide the ISS crew with some entertaining and excitement about their projects. #5, Language universal projects work best.
The APRS project has a low following and does not generate much excitement or newspaper coverage. SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals month after month, you will see a huge interest in the abilities of Amateur Radio on ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember seeing a new story showing how the Great-Lakes ices was changing week after week, based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image. I know this is the lowest quality image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Bob, please remind us what SSTV mode is used on NO104?
When in Sun, and battery is high enough. It will send an SSTV image once every 4 minutes on 435.350 +/- Doppler.
If sun is real good, it will be every 2 minutes.
If sun is poor, the dowlink will only contain PSK31 users and Telemetry.
If you want to go two-way with an SSTV uplink, you need to TX on the 29.481 MHz uplink While PSK31 is being uplinked anywhere in the passband (required to key up transm[onder).. Can be done from same transmitter if you can figure out how to mix a PSK31 tone from the PC with the SSTV tone from the same PC, or have an intetnded recipient tx PSK31 while you TX SSTV. The gtransponder is full duplex so you can both hear both signals while transmitting.
BOb
Sent from my iPhone
On Jul 19, 2021, at 18:28, Robert Bruninga [email protected] wrote:
The only downside is that its orbit is at a 28 degree latitude and so is low on the southern horizon for northern states. Though the elevation goes up and down over a two week period by several degrees.
Let me know that it is working. Oh, also, the pass has to be in the sun for power and for live images. bob
On Mon, Jul 19, 2021 at 4:03 PM David Spoelstra [email protected] wrote:
@WB4APR I didn't know that! When I read about the satellite initially I thought that you only got an SSTV image if someone was transmitting one. I didn't realize that it constantly transmitted what was in it's memory (at least I'm guessing that). I'm going to try that ASAP and let my club know too. Thanks! -David, N9KT
On Mon, Jul 19, 2021 at 1:43 PM Robert Bruninga [email protected] wrote:
We have both. To receive SSTV, the APRS PSAT2 satellite supports it full time with an SSTV image once every 4 minutes full time 24/7/365.on 435.350 MHz.
In addition, users can also uplink their own images to the SSTV transponder on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected] wrote:
Best Project first: If you have multiple projects and limited resources, you need to choose the project that will be the most successful or Get the best bang for the buck. What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the Amateur-Radio or SWL Hobby. #3, Get more people excited about the ISS and is open programs that can allow the average person to participate. #4, Provide the ISS crew with some entertaining and excitement about their projects. #5, Language universal projects work best.
The APRS project has a low following and does not generate much excitement or newspaper coverage. SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals month after month, you will see a huge interest in the abilities of Amateur Radio on ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember seeing a new story showing how the Great-Lakes ices was changing week after week, based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image. I know this is the lowest quality image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Bob - I believe Tom is asking what format the SSTV is sent in. Like the ISS images are PD120. I believe NO-104 images are sent in Robot 36 mode. -David, N9KT
On Tue, Jul 20, 2021 at 10:05 AM Tom Schuessler [email protected] wrote:
Barb, please remind us what SSTV mode is used on NO104?
Sent from my iPhone
On Jul 19, 2021, at 18:28, Robert Bruninga [email protected] wrote:
The only downside is that its orbit is at a 28 degree latitude and so is low on the southern horizon for northern states. Though the elevation goes up and down over a two week period by several degrees.
Let me know that it is working. Oh, also, the pass has to be in the sun for power and for live images. bob
On Mon, Jul 19, 2021 at 4:03 PM David Spoelstra <
[email protected]> wrote:
@WB4APR I didn't know that! When I read about the satellite initially I
thought that you only got an SSTV image if someone was transmitting one. I didn't realize that it constantly transmitted what was in it's memory (at least I'm guessing that). I'm going to try that ASAP and let my club know too.
Thanks! -David, N9KT
On Mon, Jul 19, 2021 at 1:43 PM Robert Bruninga [email protected]
wrote:
We have both. To receive SSTV, the APRS PSAT2 satellite supports it
full time
with an SSTV image once every 4 minutes full time 24/7/365.on 435.350
MHz.
In addition, users can also uplink their own images to the SSTV
transponder
on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected]
wrote:
Best Project first: If you have multiple projects and limited resources, you need to
choose the project that will be the most successful or Get the best bang for the buck.
What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the
Amateur-Radio or SWL Hobby.
#3, Get more people excited about the ISS and is open programs that
can allow the average person to participate.
#4, Provide the ISS crew with some entertaining and excitement about
their projects.
#5, Language universal projects work best.
The APRS project has a low following and does not generate much
excitement or newspaper coverage.
SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals
month after
month, you will see a huge interest in the abilities of Amateur Radio
on ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out
SSTV
images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember
seeing
a new story showing how the Great-Lakes ices was changing week after
week,
based on images from Mir SSTV.
If we want to build up a large amount of support for existing and
future
Amateur radio projects on ISS, then we need to put our best project
front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a
row 24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting
time
is only about 36 seconds for each image. I know this is the lowest
quality
image format, but since it’s the shortest, we can keep the radio
cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi
[Usually
during space walks], the radio will also run hotter at 10 psi, than
at 14 psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day,
7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum
available
to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views
of AMSAT-NA.
Acceptable Use and Privacy Policies available at
https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Acceptable Use and Privacy Policies available at
https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at
Thank you David for the format and thank you Bob for the cool information about how things actually work up there. I host a local 2 meter AMSAT info net here in the Dallas area on Tuesdays and Wednesdays of most weeks, and I wanted to bring up the PSAT-2 SSTV as a challenge to all the local folks who find it so easy to grab the ISS frames but are gonna have to work a little harder to get the stuff from this satellite. Bringing up challenges is a good thing. Unfortunately right now most of the North America passes are in the early morning hours but that will change back to full daylight passes in a few weeks.
So then a clarification just so I understand. When in sunlight with full battery the FM downlink carrier is Always-On, or only on when it hears a PSK signal? Does it do SSTV only if the power budget is good an carrier is always on doing an image every four minutes?
I will also go back and read Bob’s documentation on his website and that should help clarify and point people as well.
Sent from my iPhone
On Jul 20, 2021, at 11:16, David Spoelstra [email protected] wrote:
Bob - I believe Tom is asking what format the SSTV is sent in. Like the ISS images are PD120. I believe NO-104 images are sent in Robot 36 mode. -David, N9KT
On Tue, Jul 20, 2021 at 10:05 AM Tom Schuessler [email protected] wrote: Barb, please remind us what SSTV mode is used on NO104?
Sent from my iPhone
On Jul 19, 2021, at 18:28, Robert Bruninga [email protected] wrote:
The only downside is that its orbit is at a 28 degree latitude and so is low on the southern horizon for northern states. Though the elevation goes up and down over a two week period by several degrees.
Let me know that it is working. Oh, also, the pass has to be in the sun for power and for live images. bob
On Mon, Jul 19, 2021 at 4:03 PM David Spoelstra [email protected] wrote:
@WB4APR I didn't know that! When I read about the satellite initially I thought that you only got an SSTV image if someone was transmitting one. I didn't realize that it constantly transmitted what was in it's memory (at least I'm guessing that). I'm going to try that ASAP and let my club know too. Thanks! -David, N9KT
On Mon, Jul 19, 2021 at 1:43 PM Robert Bruninga [email protected] wrote:
We have both. To receive SSTV, the APRS PSAT2 satellite supports it full time with an SSTV image once every 4 minutes full time 24/7/365.on 435.350 MHz.
In addition, users can also uplink their own images to the SSTV transponder on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected] wrote:
Best Project first: If you have multiple projects and limited resources, you need to choose the project that will be the most successful or Get the best bang for the buck. What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the Amateur-Radio or SWL Hobby. #3, Get more people excited about the ISS and is open programs that can allow the average person to participate. #4, Provide the ISS crew with some entertaining and excitement about their projects. #5, Language universal projects work best.
The APRS project has a low following and does not generate much excitement or newspaper coverage. SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals month after month, you will see a huge interest in the abilities of Amateur Radio on ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember seeing a new story showing how the Great-Lakes ices was changing week after week, based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image. I know this is the lowest quality image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
The 435.350 +/- Doppler FM downlink is only on if PSK31 is present OR the satellite is playing an SSTV signal (once every 4 minutes, or 2 minus, or from user uplink (simultanelous with SSTV). Bob, WB4APR
On Tue, Jul 20, 2021 at 1:01 PM Tom Schuessler [email protected] wrote:
Thank you David for the format and thank you Bob for the cool information about how things actually work up there. I host a local 2 meter AMSAT info net here in the Dallas area on Tuesdays and Wednesdays of most weeks, and I wanted to bring up the PSAT-2 SSTV as a challenge to all the local folks who find it so easy to grab the ISS frames but are gonna have to work a little harder to get the stuff from this satellite. Bringing up challenges is a good thing. Unfortunately right now most of the North America passes are in the early morning hours but that will change back to full daylight passes in a few weeks.
So then a clarification just so I understand. When in sunlight with full battery the FM downlink carrier is Always-On, or only on when it hears a PSK signal? Does it do SSTV only if the power budget is good an carrier is always on doing an image every four minutes?
I will also go back and read Bob’s documentation on his website and that should help clarify and point people as well.
Sent from my iPhone
On Jul 20, 2021, at 11:16, David Spoelstra [email protected] wrote:
Bob - I believe Tom is asking what format the SSTV is sent in. Like the ISS images are PD120. I believe NO-104 images are sent in Robot 36 mode. -David, N9KT
On Tue, Jul 20, 2021 at 10:05 AM Tom Schuessler [email protected] wrote:
Barb, please remind us what SSTV mode is used on NO104?
Sent from my iPhone
On Jul 19, 2021, at 18:28, Robert Bruninga [email protected] wrote:
The only downside is that its orbit is at a 28 degree latitude and so is low on the southern horizon for northern states. Though the elevation goes up and down over a two week period by several degrees.
Let me know that it is working. Oh, also, the pass has to be in the sun for power and for live images. bob
On Mon, Jul 19, 2021 at 4:03 PM David Spoelstra [email protected] wrote:
@WB4APR I didn't know that! When I read about the satellite initially I thought that you only got an SSTV image if someone was transmitting one. I didn't realize that it constantly transmitted what was in it's memory (at least I'm guessing that). I'm going to try that ASAP and let my club know too. Thanks! -David, N9KT
On Mon, Jul 19, 2021 at 1:43 PM Robert Bruninga [email protected] wrote:
We have both. To receive SSTV, the APRS PSAT2 satellite supports it full time with an SSTV image once every 4 minutes full time 24/7/365.on 435.350 MHz.
In addition, users can also uplink their own images to the SSTV transponder on 29.481 MHz. See how on http://aprs.org/psat2.html
The transponder is also available for PSK31 users. - Bob, WB4APR
On Mon, Jul 19, 2021 at 1:13 PM GMM via AMSAT-BB [email protected] wrote:
Best Project first: If you have multiple projects and limited resources, you need to choose the project that will be the most successful or Get the best bang for the buck. What are you goals for an Amateur-Radio project for ISS?
#1, Generate interest in Amateur radio capabilities. #2, Encourage Non-Amateur-radio people to possibly get-into the Amateur-Radio or SWL Hobby. #3, Get more people excited about the ISS and is open programs that can allow the average person to participate. #4, Provide the ISS crew with some entertaining and excitement about their projects. #5, Language universal projects work best.
The APRS project has a low following and does not generate much excitement or newspaper coverage. SSTV does great and all 5 of the listed categories. Why is SSTV better the APRS? SSTV is a project that will cross over between two hobbies, Short-wave-listening and Amateur radio. Most Short-wave-listening and Amateur operators are capable of receiving and decoding SSTV signals. With 10's of millions of SWL+AR stations receiving these signals month after month, you will see a huge interest in the abilities of Amateur Radio on ISS.
You must have heard the saying "A picture is worth a thousand words". When MarexMG was running the SSTV Program in Space Station Mir, out SSTV images were showing up in magazines and newspapers around the world.
When was the last time you saw a New paper or magazine story [Non-ham] talking about APRS from ISS? Never!
The MarexMG SSTV project was a huge hit. Schools around the world were setting up receiving stations to receive the images. I remember seeing a new story showing how the Great-Lakes ices was changing week after week, based on images from Mir SSTV.
If we want to build up a large amount of support for existing and future Amateur radio projects on ISS, then we need to put our best project front and center.
I am not talking about turning on SSTV for 1 or two weekend per year. I am talking about turning it on for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
Image cycle duration: Let's keep is Simple and Safe. Recommended format: To provide the greatest access and reduce Heat stress on the radio, I recommend using SSTV format Robot-36.
The reason for the low-quality Robot-36, is because the transmitting time is only about 36 seconds for each image. I know this is the lowest quality image format, but since it’s the shortest, we can keep the radio cooler.
All transmitters run MUCH hotter in Zero Gravity! And if the ISS Air pressure is turned down from 14 psi to 10 psi [Usually during space walks], the radio will also run hotter at 10 psi, than at 14 psi.
Maximum number of ISS-transmitted images per hour. 1 image every 5 minutes or 20 per hour. And depending on heatsink temperature and cooling fan status, we may need to reduce the number of pictures per hour to keep the radio cool.
My goal is to expand the presence of Amateur Radio on ISS and other satellites and the best tools we have on ISS today is Slow Scan TV. Let's generate some worldwide excitement and make this hobby grow.
Turn off APRS!
Turn ON SSTV for a FULL 6 consecutive months in a row 24 hours a day, 7-days a week.
And then start watch the publicly generated by Marex SPACE-CAM1
by Miles, WF1F
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected]org To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
-
Brian Wilkins -
David Spoelstra -
GMM -
Greg D -
Keith E. Brandt, MD, MPH -
Rick Walter -
Robert Bruninga -
sjdevience＠gmail.com -
Tom Schuessler