Hello AMSAT-ers
The University of Louisiana has a slot on a ULA mission to GTO launch to GTO for a 1u. WE are asking the community what payload should we fly, how to mitigate the radiation and who wants to help the students?
http://www.ulalaunch.com/ula-announces-2016-cubesat-stem-winners.aspx?title= United+Launch+Alliance+Announces+CubeSat+STEM+Education+Program+Winners http://www.ulalaunch.com/ula-announces-2016-cubesat-stem-winners.aspx?title =United+Launch+Alliance+Announces+CubeSat+STEM+Education+Program+Winners&Cat egory=News &Category=News
73's and see you on the baot
nick k5qxj
Given my recent interest and the previous thread on 'deep space tracking,' a linear transponder on a HEO bird could offer an interesting 'test bird' to conducting ranging operations and orbit determination with. It is more 'deep space like' than the current LEO birds, but is still in earth orbit and can be modeled with TLEs (so that we can check against NORAD updates to see how 'good' we are doing).
If the design is similar to what will be used on the CQC bird (or at least an approximation that could work in a 1U), then we (as in the amateur satellite community) could test out the required earth station hardware / backend processing for something like this, as well as get vital training for future missions such as the CQC bird and potential other HEO missions.
Couple of points to back up the idea:
1. I'm guessing a 1U in HEO is probably tough power budget wise, so link budgets will probably be tight. PN sequence ranging (in my limited understanding of the subject) requires way less SNR than normal communications and data transfer since your just looking for correlations against the known PN sequence, so it is maybe viable given a tighter link budget.
2. A 5GHz up/10 GHz down payload is probably not viable in a 1u (link budgets, size constraints, etc). So, something like a 23cm up, 70cm down bent pipe transponder would be interesting. The problem here will likely be community 'backlash' in that L-band uplink stations are less common in the Amateur Community. I would offer the argument of 'use it or lose it' to help protect the 23cm uplink band, and also the fact that AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder). So maybe having another 23cm uplink bird will interest people in adding a band to their station (if two birds isn't enough, maybe three is?). If L-Band up is too hard to swallow, then a 2m up/70cm down bent pipe in HEO would still be interesting, compatible with most Amateur ground stations, and could still be used to test ranging operations.
3. Heavy Forward Error Correction on a separate low rate TLM downlink would probably be a good idea (like AO-73, again due to probably tight power budget).
4. training, Training, TRAINING! I know AMSAT has conducted ranging on their own in the past, but its been a while. There are probably new members in the community that would like to get into this sort of thing and learn this type of skill (I include myself in that list), and the folks that have done it before could help train up a younger/newer generation of AMSAT folks, which would help protect the 'technical leadership in the field of small sats' future of AMSAT.
I have no good answer for the radiation part of your question. Also, I'd love to help out the students, but have my hands full here with our own students at VT.
Just throwing out an idea for a payload.......
Congrats on getting a ride!
-Zach, KJ4QLP
Research Associate Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 10/24/2016 2:38 AM, Nick Pugh wrote:
Hello AMSAT-ers
The University of Louisiana has a slot on a ULA mission to GTO launch to GTO for a 1u. WE are asking the community what payload should we fly, how to mitigate the radiation and who wants to help the students?
http://www.ulalaunch.com/ula-announces-2016-cubesat-stem-winners.aspx?title= United+Launch+Alliance+Announces+CubeSat+STEM+Education+Program+Winners http://www.ulalaunch.com/ula-announces-2016-cubesat-stem-winners.aspx?title =United+Launch+Alliance+Announces+CubeSat+STEM+Education+Program+Winners&Cat egory=News &Category=News
73's and see you on the baot
nick k5qxj
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Some sort of linear transponder would be an ideal payload, even if you'd need a really darn good station to use it (usage of low bit rate digital modes through the transponder could help). The last ULA launch to GTO that I could find orbit details for was to 35,789 km x 3,830 km with a 19 degree inclination. A transponder may only be usable by the best equipped stations at apogee, but many more stations could use it at perigee.
73,
Paul, N8HM
On Mon, Oct 24, 2016 at 11:20 AM, Zach Leffke [email protected] wrote:
Given my recent interest and the previous thread on 'deep space tracking,' a linear transponder on a HEO bird could offer an interesting 'test bird' to conducting ranging operations and orbit determination with. It is more 'deep space like' than the current LEO birds, but is still in earth orbit and can be modeled with TLEs (so that we can check against NORAD updates to see how 'good' we are doing).
If the design is similar to what will be used on the CQC bird (or at least an approximation that could work in a 1U), then we (as in the amateur satellite community) could test out the required earth station hardware / backend processing for something like this, as well as get vital training for future missions such as the CQC bird and potential other HEO missions.
Couple of points to back up the idea:
- I'm guessing a 1U in HEO is probably tough power budget wise, so link
budgets will probably be tight. PN sequence ranging (in my limited understanding of the subject) requires way less SNR than normal communications and data transfer since your just looking for correlations against the known PN sequence, so it is maybe viable given a tighter link budget.
- A 5GHz up/10 GHz down payload is probably not viable in a 1u (link
budgets, size constraints, etc). So, something like a 23cm up, 70cm down bent pipe transponder would be interesting. The problem here will likely be community 'backlash' in that L-band uplink stations are less common in the Amateur Community. I would offer the argument of 'use it or lose it' to help protect the 23cm uplink band, and also the fact that AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder). So maybe having another 23cm uplink bird will interest people in adding a band to their station (if two birds isn't enough, maybe three is?). If L-Band up is too hard to swallow, then a 2m up/70cm down bent pipe in HEO would still be interesting, compatible with most Amateur ground stations, and could still be used to test ranging operations.
- Heavy Forward Error Correction on a separate low rate TLM downlink
would probably be a good idea (like AO-73, again due to probably tight power budget).
- training, Training, TRAINING! I know AMSAT has conducted ranging on
their own in the past, but its been a while. There are probably new members in the community that would like to get into this sort of thing and learn this type of skill (I include myself in that list), and the folks that have done it before could help train up a younger/newer generation of AMSAT folks, which would help protect the 'technical leadership in the field of small sats' future of AMSAT.
I have no good answer for the radiation part of your question. Also, I'd love to help out the students, but have my hands full here with our own students at VT.
Just throwing out an idea for a payload.......
Congrats on getting a ride!
-Zach, KJ4QLP
Research Associate Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 10/24/2016 2:38 AM, Nick Pugh wrote:
Hello AMSAT-ers
The University of Louisiana has a slot on a ULA mission to GTO launch to GTO for a 1u. WE are asking the community what payload should we fly, how to mitigate the radiation and who wants to help the students?
http://www.ulalaunch.com/ula-announces-2016-cubesat-stem-win ners.aspx?title= United+Launch+Alliance+Announces+CubeSat+STEM+Education+Program+Winners http://www.ulalaunch.com/ula-announces-2016-cubesat-stem-wi nners.aspx?title =United+Launch+Alliance+Announces+CubeSat+STEM+Education+ Program+Winners&Cat egory=News &Category=News
73's and see you on the baot
nick k5qxj
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
I would also support and emphasize some form of transponder. I'm exactly the kind of newer operator that Zach makes reference to that has never has anything outside of an LEO bird to work with. While I lack anything outside of 70cm/2m all-mode capability at the moment, if a new bird were launched with a 23cm (or really any other band) transponder I will certainly upgrade my station in order to work it. I'm not picky on mode or bands, just having some form of transponder in a higher orbit is what excites me.
I'm also certainly willing to assist with training and student support where I can. I'm somewhat tied up in my own graduate research for the next 4-5 months, but once that's complete I'll have a large academic load removed from the shoulders.. no reason I couldn't grab another one to pick up.
73!
Dave, KG5CCI
On Mon, Oct 24, 2016 at 10:38 AM, Paul Stoetzer [email protected] wrote:
Some sort of linear transponder would be an ideal payload, even if you'd need a really darn good station to use it (usage of low bit rate digital modes through the transponder could help). The last ULA launch to GTO that I could find orbit details for was to 35,789 km x 3,830 km with a 19 degree inclination. A transponder may only be usable by the best equipped stations at apogee, but many more stations could use it at perigee.
73,
Paul, N8HM
On Mon, Oct 24, 2016 at 11:20 AM, Zach Leffke [email protected] wrote:
Given my recent interest and the previous thread on 'deep space tracking,' a linear transponder on a HEO bird could offer an interesting 'test bird' to conducting ranging operations and orbit determination
with.
It is more 'deep space like' than the current LEO birds, but is still in earth orbit and can be modeled with TLEs (so that we can check against NORAD updates to see how 'good' we are doing).
If the design is similar to what will be used on the CQC bird (or at
least
an approximation that could work in a 1U), then we (as in the amateur satellite community) could test out the required earth station hardware / backend processing for something like this, as well as get vital training for future missions such as the CQC bird and potential other HEO
missions.
Couple of points to back up the idea:
- I'm guessing a 1U in HEO is probably tough power budget wise, so link
budgets will probably be tight. PN sequence ranging (in my limited understanding of the subject) requires way less SNR than normal communications and data transfer since your just looking for correlations against the known PN sequence, so it is maybe viable given a tighter link budget.
- A 5GHz up/10 GHz down payload is probably not viable in a 1u (link
budgets, size constraints, etc). So, something like a 23cm up, 70cm down bent pipe transponder would be interesting. The problem here will likely be community 'backlash' in that L-band uplink stations are less common in the Amateur Community. I would offer the argument of 'use it or lose it' to help protect the 23cm uplink band, and also the fact that AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder). So maybe having another 23cm uplink bird will interest people in adding a band to their station (if two birds isn't enough, maybe three is?). If L-Band up is too hard to swallow, then a 2m up/70cm down bent pipe in HEO would still be interesting, compatible with most Amateur ground stations, and could still be used to test ranging operations.
- Heavy Forward Error Correction on a separate low rate TLM downlink
would probably be a good idea (like AO-73, again due to probably tight power budget).
- training, Training, TRAINING! I know AMSAT has conducted ranging on
their own in the past, but its been a while. There are probably new members in the community that would like to get into this sort of thing
and
learn this type of skill (I include myself in that list), and the folks that have done it before could help train up a younger/newer generation
of
AMSAT folks, which would help protect the 'technical leadership in the field of small sats' future of AMSAT.
I have no good answer for the radiation part of your question. Also, I'd love to help out the students, but have my hands full here with our own students at VT.
Just throwing out an idea for a payload.......
Congrats on getting a ride!
-Zach, KJ4QLP
Research Associate Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 10/24/2016 2:38 AM, Nick Pugh wrote:
Hello AMSAT-ers
The University of Louisiana has a slot on a ULA mission to GTO launch
to
GTO for a 1u. WE are asking the community what payload should we fly,
how
to mitigate the radiation and who wants to help the students?
http://www.ulalaunch.com/ula-announces-2016-cubesat-stem-win ners.aspx?title= United+Launch+Alliance+Announces+CubeSat+STEM+Education+Program+Winners http://www.ulalaunch.com/ula-announces-2016-cubesat-stem-wi nners.aspx?title =United+Launch+Alliance+Announces+CubeSat+STEM+Education+ Program+Winners&Cat egory=News &Category=News
73's and see you on the baot
nick k5qxj
Sent via [email protected]. 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!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
On 10/24/2016 10:20, Zach Leffke wrote:
AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder)
I would just like to correct this information, so that everyone is aware and not surprised by what will be in orbit. Fox-1Cliff and Fox-1D have the L/v band capability that Zach mentioned. RadFxSat-2 (Fox-1E) will not.
Thanks.
Jerry Buxton, NØJY
AHHH, sorry, i screwed that one up.
Two birds with L-band up (1Cliff and 1D), but not the one with the linear (1E).
Somehow I can't get that straight in my head (this isn't the first time I've mixed that up).
So many Foxes of various band/mode combos on the way! I suppose in a way this is a good problem!
Sorry, Jerry (and everyone else). I hope I didn't cause too much confusion there. And thank you very much for the correction.
-Zach, KJ4QLP
Research Associate Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 10/24/2016 2:34 PM, Jerry Buxton wrote:
On 10/24/2016 10:20, Zach Leffke wrote:
AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder)
I would just like to correct this information, so that everyone is aware and not surprised by what will be in orbit. Fox-1Cliff and Fox-1D have the L/v band capability that Zach mentioned. RadFxSat-2 (Fox-1E) will not.
Thanks.
Jerry Buxton, NØJY
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Nick, Zach et al,
The suggestion for an L band uplink, or any uplink or downlink above 70cm for that matter, is very welcome. We absolutely need to populate the higher UHF and SHF bands in a way that we can justify their allocation to the amateur radio and amateur satellite services when we amateurs sit with regulators to defend them. Higher bands are more challenging to use, but they do offer advantages -- wider bandwidths, higher data rates, etc.
73, Edson PY2SDR
--- - We humans have the capability to do amazing things if we work together. - Nós seres humanos temos a capacidade de fazer coisas incríveis se trabalharmos juntos.
On Mon, Oct 24, 2016 at 5:07 PM, Zach Leffke [email protected] wrote:
AHHH, sorry, i screwed that one up.
Two birds with L-band up (1Cliff and 1D), but not the one with the linear (1E).
Somehow I can't get that straight in my head (this isn't the first time I've mixed that up).
So many Foxes of various band/mode combos on the way! I suppose in a way this is a good problem!
Sorry, Jerry (and everyone else). I hope I didn't cause too much confusion there. And thank you very much for the correction.
-Zach, KJ4QLP
Research Associate Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 10/24/2016 2:34 PM, Jerry Buxton wrote:
On 10/24/2016 10:20, Zach Leffke wrote:
AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder)
I would just like to correct this information, so that everyone is aware and not surprised by what will be in orbit. Fox-1Cliff and Fox-1D have the L/v band capability that Zach mentioned. RadFxSat-2 (Fox-1E) will not.
Thanks.
Jerry Buxton, NØJY
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
On 10/24/16 14:23, Edson W. R. Pereira wrote:
Nick, Zach et al,
The suggestion for an L band uplink, or any uplink or downlink above 70cm for that matter, is very welcome. We absolutely need to populate the higher UHF and SHF bands in a way that we can justify their allocation to the amateur radio and amateur satellite services when we amateurs sit with regulators to defend them. Higher bands are more challenging to use, but they do offer advantages -- wider bandwidths, higher data rates, etc.
A project is underway to do just that. See this story:
http://www.arrl.org/news/amsat-seeks-volunteers-to-support-phase-4-five-and-...
--- Zach N0ZGO
Is there a reason why S band is not being considered. It was good on AO-40 (sobsob). Probably because of local QRM etc. 73 Bob W7LRD
----- Original Message -----
From: "Edson W. R. Pereira" [email protected] To: "amsat-bb" [email protected] Sent: Monday, October 24, 2016 12:23:55 PM Subject: Re: [amsat-bb] HEO opertunity
Nick, Zach et al,
The suggestion for an L band uplink, or any uplink or downlink above 70cm for that matter, is very welcome. We absolutely need to populate the higher UHF and SHF bands in a way that we can justify their allocation to the amateur radio and amateur satellite services when we amateurs sit with regulators to defend them. Higher bands are more challenging to use, but they do offer advantages -- wider bandwidths, higher data rates, etc.
73, Edson PY2SDR
--- - We humans have the capability to do amazing things if we work together. - Nós seres humanos temos a capacidade de fazer coisas incríveis se trabalharmos juntos.
On Mon, Oct 24, 2016 at 5:07 PM, Zach Leffke [email protected] wrote:
AHHH, sorry, i screwed that one up.
Two birds with L-band up (1Cliff and 1D), but not the one with the linear (1E).
Somehow I can't get that straight in my head (this isn't the first time I've mixed that up).
So many Foxes of various band/mode combos on the way! I suppose in a way this is a good problem!
Sorry, Jerry (and everyone else). I hope I didn't cause too much confusion there. And thank you very much for the correction.
-Zach, KJ4QLP
Research Associate Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 10/24/2016 2:34 PM, Jerry Buxton wrote:
On 10/24/2016 10:20, Zach Leffke wrote:
AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder)
I would just like to correct this information, so that everyone is aware and not surprised by what will be in orbit. Fox-1Cliff and Fox-1D have the L/v band capability that Zach mentioned. RadFxSat-2 (Fox-1E) will not.
Thanks.
Jerry Buxton, NØJY
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
I would like to see 23cm and above seriously considered. My military experience (30 years) demonstrated to me how easily we can communicate with lots of bandwidth up there. My detachments did it all the time, easy peasy. Granted that military radios are pretty much point and shoot, and easy use for relatively untrained soldiers. Ham gear for 23cm is common in Europe, and there is no reason we in the USA can't have that capability. I have a 23cm module for my FT-736R and a home brew helical with which I rag chew with the other hams on 23 in the middle Tennessee area. I am not suggesting we all mold and cast our own wave-guides, but just put some effort into the old Ham Radio "home brew" thing. One thing about S and L and the other microwave bands is that we have bandwidth out the wazoo.
73, Dave N4CVX
Sent from my iPad
On Oct 24, 2016, at 17:06, Bob- W7LRD [email protected] wrote:
Is there a reason why S band is not being considered. It was good on AO-40 (sobsob). Probably because of local QRM etc. 73 Bob W7LRD
----- Original Message -----
From: "Edson W. R. Pereira" [email protected] To: "amsat-bb" [email protected] Sent: Monday, October 24, 2016 12:23:55 PM Subject: Re: [amsat-bb] HEO opertunity
Nick, Zach et al,
The suggestion for an L band uplink, or any uplink or downlink above 70cm for that matter, is very welcome. We absolutely need to populate the higher UHF and SHF bands in a way that we can justify their allocation to the amateur radio and amateur satellite services when we amateurs sit with regulators to defend them. Higher bands are more challenging to use, but they do offer advantages -- wider bandwidths, higher data rates, etc.
73, Edson PY2SDR
- We humans have the capability to do amazing things if we work together.
- Nós seres humanos temos a capacidade de fazer coisas incríveis se
trabalharmos juntos.
On Mon, Oct 24, 2016 at 5:07 PM, Zach Leffke [email protected] wrote:
AHHH, sorry, i screwed that one up.
Two birds with L-band up (1Cliff and 1D), but not the one with the linear (1E).
Somehow I can't get that straight in my head (this isn't the first time I've mixed that up).
So many Foxes of various band/mode combos on the way! I suppose in a way this is a good problem!
Sorry, Jerry (and everyone else). I hope I didn't cause too much confusion there. And thank you very much for the correction.
-Zach, KJ4QLP
Research Associate Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 10/24/2016 2:34 PM, Jerry Buxton wrote:
On 10/24/2016 10:20, Zach Leffke wrote:
AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder)
I would just like to correct this information, so that everyone is aware and not surprised by what will be in orbit. Fox-1Cliff and Fox-1D have the L/v band capability that Zach mentioned. RadFxSat-2 (Fox-1E) will not.
Thanks.
Jerry Buxton, NØJY
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Agreed, but thinking back to AO-51, weren't there some geographic limitations to the use of 23cm as an uplink? Have things changed since then?
I'd love to get some use from my 23cm setup on the birds again, and the AO-40 downlink is sitting in the attic, totally unused.
Greg KO6TH
Dave Mann wrote:
I would like to see 23cm and above seriously considered. My military experience (30 years) demonstrated to me how easily we can communicate with lots of bandwidth up there. My detachments did it all the time, easy peasy. Granted that military radios are pretty much point and shoot, and easy use for relatively untrained soldiers. Ham gear for 23cm is common in Europe, and there is no reason we in the USA can't have that capability. I have a 23cm module for my FT-736R and a home brew helical with which I rag chew with the other hams on 23 in the middle Tennessee area. I am not suggesting we all mold and cast our own wave-guides, but just put some effort into the old Ham Radio "home brew" thing. One thing about S and L and the other microwave bands is that we have bandwidth out the wazoo.
73, Dave N4CVX
Sent from my iPad
On Oct 24, 2016, at 17:06, Bob- W7LRD [email protected] wrote:
Is there a reason why S band is not being considered. It was good on AO-40 (sobsob). Probably because of local QRM etc. 73 Bob W7LRD
----- Original Message -----
From: "Edson W. R. Pereira" [email protected] To: "amsat-bb" [email protected] Sent: Monday, October 24, 2016 12:23:55 PM Subject: Re: [amsat-bb] HEO opertunity
Nick, Zach et al,
The suggestion for an L band uplink, or any uplink or downlink above 70cm for that matter, is very welcome. We absolutely need to populate the higher UHF and SHF bands in a way that we can justify their allocation to the amateur radio and amateur satellite services when we amateurs sit with regulators to defend them. Higher bands are more challenging to use, but they do offer advantages -- wider bandwidths, higher data rates, etc.
73, Edson PY2SDR
- We humans have the capability to do amazing things if we work together.
- Nós seres humanos temos a capacidade de fazer coisas incríveis se
trabalharmos juntos.
On Mon, Oct 24, 2016 at 5:07 PM, Zach Leffke [email protected] wrote:
AHHH, sorry, i screwed that one up.
Two birds with L-band up (1Cliff and 1D), but not the one with the linear (1E).
Somehow I can't get that straight in my head (this isn't the first time I've mixed that up).
So many Foxes of various band/mode combos on the way! I suppose in a way this is a good problem!
Sorry, Jerry (and everyone else). I hope I didn't cause too much confusion there. And thank you very much for the correction.
-Zach, KJ4QLP
Research Associate Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 10/24/2016 2:34 PM, Jerry Buxton wrote:
On 10/24/2016 10:20, Zach Leffke wrote:
AMSAT is planning an L-Band uplink for two of the 5 foxes (including 1E which will be a linear transponder)
I would just like to correct this information, so that everyone is aware and not surprised by what will be in orbit. Fox-1Cliff and Fox-1D have the L/v band capability that Zach mentioned. RadFxSat-2 (Fox-1E) will not.
Thanks.
Jerry Buxton, NØJY
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Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. 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! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
"Is there a reason why S band is not being considered. It was good on AO-40 (sobsob). Probably because of local QRM etc" Yes Bob, unfortunately high levels of WiFi etc interference make 2400 MHz unusable in Urban areas, it's why the ISS HamTV transmitter has to operate on 2395 MHz outside the Amateur-Satellite Service allocation. The power budget would be the determining factor as to which payload could be flown. For a standard 1U CubeSat without the complexity and risk of fold-out solar panels or fold-out antennas you are probably looking at about 400 mW RF output to an omni-directional antenna. This might suggest that in addition to a telemetry beacon you might support a 25 kHz bandwidth 435 to 145 MHz linear transponder.
A 1260/435 MHz transponder would be an alternative but would require significantly higher gain ground station antennas.
73 Trevor M5AKA
On Oct 24, 2016, at 17:06, Bob- W7LRD [email protected] wrote:
Is there a reason why S band is not being considered. It was good on AO-40 (sobsob). Probably because of local QRM etc. 73 Bob W7LRD
participants (11)
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Bob- W7LRD -
Dave Mann -
David Swanson -
Edson W. R. Pereira -
Greg D -
Jerry Buxton -
M5AKA -
Nick Pugh -
Paul Stoetzer -
Zach Leffke -
Zach Metzinger