The Cubesats thread that I started several days ago has morphed into a general dscussion of AMSAT satellites. Mr Moderator, please change the thread accordingly. Before that happened, some excellent technical points were made about Cubesats. What;s the best way to get them into the hands of designers and builders? Speaking personally, I was impressed by how little things have chaged since the early days. As the French say, "plus ca change, plus la meme chose." Proolems with negative power budgets, antenna deployment, thermal design, lack of rad-hard components, and IHU failures, to just a few, were evident in the 1970s and 1980s, and were written about at the time. If anything, they have been made worse by the inadequate financial resources and lack of technical sophistication which are all too common in the Cubesat world. To those who participated, thank you. 73 Ray W2RS
Hello Ray,
Some sort of standard would be good. That way AMSAT could potentially offload some of the overall costs.
For example a commercial transceiver for a CubeSat is $10,000 USD. That many CubeSat builders likely go to as they are not radio experts. But ISIS uses a standard form factor.
https://www.cubesatshop.com/product/isis-uhf-downlink-vhf-uplink-full-duplex...
A standard reference like the PC104 interface is taught in many schools as part of computer engineering. So students would have less of a learning curve adapting it to their CubeSat design. As nothing is proprietary.
If a design of a transceiver that can be tested and found space worthy can be developed for a more reasonable cost. It would incentivize schools to allow their CubeSats to be used for amateur radio en mass.
Dimitrios VA3DSZ
On Tue., Feb. 2, 2021, 10:25 Ray Soifer via AMSAT-BB, amsat-bb@amsat.org wrote:
The Cubesats thread that I started several days ago has morphed into a general dscussion of AMSAT satellites. Mr Moderator, please change the thread accordingly.
Before that happened, some excellent technical points were made about Cubesats. What;s the best way to get them into the hands of designers and builders?
Speaking personally, I was impressed by how little things have chaged since the early days. As the French say, "plus ca change, plus la meme chose." Proolems with negative power budgets, antenna deployment, thermal design, lack of rad-hard components, and IHU failures, to just a few, were evident in the 1970s and 1980s, and were written about at the time. If anything, they have been made worse by the inadequate financial resources and lack of technical sophistication which are all too common in the Cubesat world.
To those who participated, thank you.
73 Ray W2RS
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. Not an AMSAT-NA member? Join now to support the amateur satellite program!
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Amsat America is handicapped by ITAR. Our HFSat is flight ready and I am requesting my organization to let me publish the entire transponder details. This is a linear transponder with 21 Mhz uplink and 29 Mhz downlink. - f
On Tue 2 Feb, 2021, 9:50 PM Dimitrios Simitas, va3dsz@gmail.com wrote:
Hello Ray,
Some sort of standard would be good. That way AMSAT could potentially offload some of the overall costs.
For example a commercial transceiver for a CubeSat is $10,000 USD. That many CubeSat builders likely go to as they are not radio experts. But ISIS uses a standard form factor.
https://www.cubesatshop.com/product/isis-uhf-downlink-vhf-uplink-full-duplex...
A standard reference like the PC104 interface is taught in many schools as part of computer engineering. So students would have less of a learning curve adapting it to their CubeSat design. As nothing is proprietary.
If a design of a transceiver that can be tested and found space worthy can be developed for a more reasonable cost. It would incentivize schools to allow their CubeSats to be used for amateur radio en mass.
Dimitrios VA3DSZ
On Tue., Feb. 2, 2021, 10:25 Ray Soifer via AMSAT-BB, amsat-bb@amsat.org wrote:
The Cubesats thread that I started several days ago has morphed into a general dscussion of AMSAT satellites. Mr Moderator, please change the thread accordingly.
Before that happened, some excellent technical points were made about Cubesats. What;s the best way to get them into the hands of designers and builders?
Speaking personally, I was impressed by how little things have chaged since the early days. As the French say, "plus ca change, plus la meme chose." Proolems with negative power budgets, antenna deployment, thermal design, lack of rad-hard components, and IHU failures, to just a few, were evident in the 1970s and 1980s, and were written about at the time. If anything, they have been made worse by the inadequate financial resources and lack of technical sophistication which are all too common in the Cubesat world.
To those who participated, thank you.
73 Ray W2RS
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. Not an AMSAT-NA member? Join now to support the amateur satellite program!
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.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
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. Not an AMSAT-NA member? Join now to support the amateur satellite program!
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.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
On 2/2/21 10:40 AM, Ashhar Farhan wrote:
Our HFSat is flight ready and I am requesting my organization to let me publish the entire transponder details. This is a linear transponder with 21 Mhz uplink and 29 Mhz downlink.
I'm extremely pleased to hear this! It's been a long time since we had an entirely-HF LT satellite.
For those who don't like homebrewing equipment at VHF/UHF, this offers a great opportunity to roll your own satellite rig (or use a pair of uBITs, right?).
--- Zach N0ZGO
Zach,
Indeed, this would be nice and back to the old fun HF days.
I also looking forward to same.
73
Jean Marc (3B8DU)
On Feb 2, 2021, at 8:47 PM, Zach Metzinger zmetzing@pobox.com wrote:
On 2/2/21 10:40 AM, Ashhar Farhan wrote:
Our HFSat is flight ready and I am requesting my organization to let me publish the entire transponder details. This is a linear transponder with 21 Mhz uplink and 29 Mhz downlink.
I'm extremely pleased to hear this! It's been a long time since we had an entirely-HF LT satellite.
For those who don't like homebrewing equipment at VHF/UHF, this offers a great opportunity to roll your own satellite rig (or use a pair of uBITs, right?).
--- Zach N0ZGO
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. Not an AMSAT-NA member? Join now to support the amateur satellite program!
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.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
There are two HF satellites currently operational if you want to play HF!
That is, the 10 meter uiplinks on PSAT and PSAT2. THey are both linear uplink transponders with an FM downlink. They were designed for PSK31 uplink, but PSAT2 has also been opened up for SSTV uplink as well.
There is no reason it cannot do SSB VOICE as well. Just TX on 29.481 SSB and hear yourself on 435.350 FM downlink. Of course, there needs to be someone on PSK31 at the same time to trigger the transponder. Can someone talk over their own PSK31 transmit?
ANyone want to try it and let us know? The transponder on PSAT can do the same thing, but the uplink is in the CW portion of the 10m band and would violate the band plans.
Bob, WB4APR
On Tue, Feb 2, 2021 at 12:06 PM Jean Marc Momple jean.marc.momple@gmail.com wrote:
Zach,
Indeed, this would be nice and back to the old fun HF days.
I also looking forward to same.
73
Jean Marc (3B8DU)
On Feb 2, 2021, at 8:47 PM, Zach Metzinger zmetzing@pobox.com wrote:
On 2/2/21 10:40 AM, Ashhar Farhan wrote:
Our HFSat is flight ready and I am requesting my organization to let me publish the entire transponder details. This is a linear transponder with 21 Mhz uplink and 29 Mhz downlink.
I'm extremely pleased to hear this! It's been a long time since we had
an entirely-HF LT satellite.
For those who don't like homebrewing equipment at VHF/UHF, this offers a
great opportunity to roll your own satellite rig (or use a pair of uBITs, right?).
--- Zach N0ZGO
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.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org 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. Not an AMSAT-NA member? Join now to support the amateur satellite program!
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.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
I've transmitted PSK31 and SSTV simultaneously using HDSDR and my SDR HF radio. HDSDR will take audio from multiple sources and transmit it at the same time. Even with a conventional radio, it should be possible to send both PSK31 and voice audio simultaneously from the computer to the radio. One would just configure the radio as if it were using any other digital mode and then use the computer mic to talk instead of the radio mic.
The PSK does not need to send any characters to be detected, so I just leave on a PSK carrier from FLDIGI. I'm not sure how well the detection would work with SSB on top of it though. I could try it.
-Stephen N8URE
"If a design of a transceiver that can be tested and found space worthy can be developed for a more reasonable cost. It would incentivize schools to allow their CubeSats to be used for amateur radio en mass."
This is the ultimate goal of the AMSAT Linear Transponder Module, flown previously on HuskySat-1 and also slated to fly on MESAT1.
73,
Paul, N8HM
On Tue, Feb 2, 2021 at 11:20 AM Dimitrios Simitas va3dsz@gmail.com wrote:
Hello Ray,
Some sort of standard would be good. That way AMSAT could potentially offload some of the overall costs.
For example a commercial transceiver for a CubeSat is $10,000 USD. That many CubeSat builders likely go to as they are not radio experts. But ISIS uses a standard form factor.
https://www.cubesatshop.com/product/isis-uhf-downlink-vhf-uplink-full-duplex...
A standard reference like the PC104 interface is taught in many schools as part of computer engineering. So students would have less of a learning curve adapting it to their CubeSat design. As nothing is proprietary.
If a design of a transceiver that can be tested and found space worthy can be developed for a more reasonable cost. It would incentivize schools to allow their CubeSats to be used for amateur radio en mass.
Dimitrios VA3DSZ
On Tue., Feb. 2, 2021, 10:25 Ray Soifer via AMSAT-BB, amsat-bb@amsat.org wrote:
The Cubesats thread that I started several days ago has morphed into a general dscussion of AMSAT satellites. Mr Moderator, please change the thread accordingly.
Before that happened, some excellent technical points were made about Cubesats. What;s the best way to get them into the hands of designers and builders?
Speaking personally, I was impressed by how little things have chaged since the early days. As the French say, "plus ca change, plus la meme chose." Proolems with negative power budgets, antenna deployment, thermal design, lack of rad-hard components, and IHU failures, to just a few, were evident in the 1970s and 1980s, and were written about at the time. If anything, they have been made worse by the inadequate financial resources and lack of technical sophistication which are all too common in the Cubesat world.
To those who participated, thank you.
73 Ray W2RS
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. Not an AMSAT-NA member? Join now to support the amateur satellite program!
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.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
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. Not an AMSAT-NA member? Join now to support the amateur satellite program!
View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.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
participants (8)
-
Ashhar Farhan -
Dimitrios Simitas -
Jean Marc Momple -
Paul Stoetzer -
Ray Soifer -
Robert Bruninga -
sjdevience＠gmail.com -
Zach Metzinger