seeking info on AMSAT (any platform) utilization of >2 GHz frequencies
Hi, I am experimenting with RF carriers above 2 GHz in my lab. According to FCC and ITU tables there are several AMATEUR-SATELLITE bands allocated above 2 GHz, to very very high frequencies.
What is the status of those frequencies in terms of past, present or planned utilization on AMSAT / other satellites ?
If those bands haven't been used, should they be not used or plans to use them to protect them from being de-assigned to other services? Is there room for experimental RF super high frequency and extremely high frequency payloads on any mission to make some use of these great resource?
73 de Samudra N3RDX The information contained in this communication is confidential, may be privileged and is intended for the exclusive use of the above named addressee(s). If you are not the intended recipient(s), you are expressly prohibited from copying, distributing, disseminating, or in any other way using any information contained within this communication. If you have received this communication in error please contact the sender by telephone or by response via mail. We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses.
As one goes up in frequency the Doppler goes up. That said, these would be great on a geostationary bird or something that moved much slower than the short Leo passes for most of our satellites. There are some satellites build and pending launch for amsat phase IV in geosynchronous orbit. Those launches are not cheap though and rides are much more difficult to come by. At least a few of the sats awaiting launches will use the microwave bands you speak of for their uplink and downlink. The advantage of using that spectrum is multiple MHZ of passband (think the entirety of all amateur spectrum 6m and below easily on one transponder 24x7x~365.25 to anyone in the footprint. It would be nice if amsat would provide better support for these projects and the teams that work on them.
Eric
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On Jul 16, 2018, at 5:29 AM, Samudra Haque [TTLLC] [email protected] wrote:
Hi, I am experimenting with RF carriers above 2 GHz in my lab. According to FCC and ITU tables there are several AMATEUR-SATELLITE bands allocated above 2 GHz, to very very high frequencies.
What is the status of those frequencies in terms of past, present or planned utilization on AMSAT / other satellites ?
If those bands haven't been used, should they be not used or plans to use them to protect them from being de-assigned to other services? Is there room for experimental RF super high frequency and extremely high frequency payloads on any mission to make some use of these great resource?
73 de Samudra N3RDX The information contained in this communication is confidential, may be privileged and is intended for the exclusive use of the above named addressee(s). If you are not the intended recipient(s), you are expressly prohibited from copying, distributing, disseminating, or in any other way using any information contained within this communication. If you have received this communication in error please contact the sender by telephone or by response via mail. We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. _______________________________________________ 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
ISS has a downlink transmitter at S-Band (~2.4 GHz) (ref: https://amsat-uk.org/satellites/hamtv-on-the-iss/) Phase4A has an uplink at S-Band (~2.4 GHz) and a downlink at X-Band (~10.5 GHz) (ref: https://amsat-uk.org/2016/06/24/phase-4a-geostationary-transponders/) AMSAT-NA is pursuing the 'Five and Dime Strategy' for future missions with C-Band (~5.66 GHz) uplinks and downlinks at X-Band (~10.5 GHz) (missions include Phase4B, Golf-T, and beyond). (ref, good place to start: https://www.amsat.org/update-on-amsat-phase-4-ground-terminal-development/)
I think historically there have been some birds that operate in the higher bands. AO-40 comes to mind with downlinks in multiple microwave bands topping out at 24 GHz (didn't miss a period there...that was twenty four gigahertz, not two point four gigahertz, though AO-40 had that too). (ref: http://www.ne.jp/asahi/hamradio/je9pel/ao40freq.htm)%C2%A0 There may be some others from the Phase 3 era with microwave uplink/downlinks, but I'm not as sure of the history there..
Many of the QB-50 downlinks included experimental S-Band downlinks (experimental in the sense of not required for the QB-50 mission, so still licensed under the Amateur Satellite Service). Many University 'beepsats' use S-Band downlinks in the Amateur Satellite allocations, though many of those operate(d) under an Experimental License.
So generally speaking, I thinks it is safe to say that YES! the Microwave satellite bands are very much alive and while there might not be a whole lot of operational stuff up there at the moment, there are many nearer term and longer term plans to continue to use those bands. The more the merrier!
-Zach, KJ4QLP
Research Associate Aerospace Systems Lab Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 7/16/2018 5:40 PM, Eric Fort wrote:
As one goes up in frequency the Doppler goes up. That said, these would be great on a geostationary bird or something that moved much slower than the short Leo passes for most of our satellites. There are some satellites build and pending launch for amsat phase IV in geosynchronous orbit. Those launches are not cheap though and rides are much more difficult to come by. At least a few of the sats awaiting launches will use the microwave bands you speak of for their uplink and downlink. The advantage of using that spectrum is multiple MHZ of passband (think the entirety of all amateur spectrum 6m and below easily on one transponder 24x7x~365.25 to anyone in the footprint. It would be nice if amsat would provide better support for these projects and the teams that work on them.
Eric
Sent using SMTP.
On Jul 16, 2018, at 5:29 AM, Samudra Haque [TTLLC] [email protected] wrote:
Hi, I am experimenting with RF carriers above 2 GHz in my lab. According to FCC and ITU tables there are several AMATEUR-SATELLITE bands allocated above 2 GHz, to very very high frequencies.
What is the status of those frequencies in terms of past, present or planned utilization on AMSAT / other satellites ?
If those bands haven't been used, should they be not used or plans to use them to protect them from being de-assigned to other services? Is there room for experimental RF super high frequency and extremely high frequency payloads on any mission to make some use of these great resource?
73 de Samudra N3RDX The information contained in this communication is confidential, may be privileged and is intended for the exclusive use of the above named addressee(s). If you are not the intended recipient(s), you are expressly prohibited from copying, distributing, disseminating, or in any other way using any information contained within this communication. If you have received this communication in error please contact the sender by telephone or by response via mail. We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. _______________________________________________ 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
Back in 2002, AO-40 was running K Band down (24,048 MHz)
G3WDG and I both had K band receivers. Charlie was running a ~10' dish? and I had just a 0.5m dish.
Charlie used circular polarization, so his receive signal didn't suffer from spin modulation. I was using a linear feed, so the signal would fade out for 2-3 secs or so as the polarization shifted from horizontal that I was running.
Here's my reception of Charlie's signal - our first successful L/k contact:
https://drive.google.com/file/d/1J_U7GIdrCr7A12XTqYmgs9L4HATyaMOJ/view?usp=s...
Here's Charlie's audio of me:
https://drive.google.com/file/d/13ffNjzyZcWNwino06wTFQn-5NVBBbmaF/view?usp=s...
Mike, N1JEZ
On 7/16/2018 6:21 PM, Zach Leffke wrote:
I think historically there have been some birds that operate in the higher bands. AO-40 comes to mind with downlinks in multiple microwave bands topping out at 24 GHz (didn't miss a period there...that was twenty four gigahertz, not two point four gigahertz, though AO-40 had that too). (ref: http://www.ne.jp/asahi/hamradio/je9pel/ao40freq.htm) There may be some others from the Phase 3 era with microwave uplink/downlinks, but I'm not as sure of the history there..
-Zach, KJ4QLP
Research Associate Aerospace Systems Lab Ted & Karyn Hume Center for National Security & Technology Virginia Polytechnic Institute & State University Work Phone: 540-231-4174 Cell Phone: 540-808-6305
On 7/16/2018 5:40 PM, Eric Fort wrote:
As one goes up in frequency the Doppler goes up. That said, these would be great on a geostationary bird or something that moved much slower than the short Leo passes for most of our satellites. There are some satellites build and pending launch for amsat phase IV in geosynchronous orbit. Those launches are not cheap though and rides are much more difficult to come by. At least a few of the sats awaiting launches will use the microwave bands you speak of for their uplink and downlink. The advantage of using that spectrum is multiple MHZ of passband (think the entirety of all amateur spectrum 6m and below easily on one transponder 24x7x~365.25 to anyone in the footprint. It would be nice if amsat would provide better support for these projects and the teams that work on them.
Eric
Sent using SMTP.
On Jul 16, 2018, at 5:29 AM, Samudra Haque [TTLLC] [email protected] wrote:
Hi, I am experimenting with RF carriers above 2 GHz in my lab. According to FCC and ITU tables there are several AMATEUR-SATELLITE bands allocated above 2 GHz, to very very high frequencies.
What is the status of those frequencies in terms of past, present or planned utilization on AMSAT / other satellites ?
If those bands haven't been used, should they be not used or plans to use them to protect them from being de-assigned to other services? Is there room for experimental RF super high frequency and extremely high frequency payloads on any mission to make some use of these great resource?
73 de Samudra N3RDX
On 07/16/18 17:52, Mike Seguin wrote:
Here's my reception of Charlie's signal - our first successful L/k contact:
https://drive.google.com/file/d/1J_U7GIdrCr7A12XTqYmgs9L4HATyaMOJ/view?usp=s...
Here's Charlie's audio of me:
https://drive.google.com/file/d/13ffNjzyZcWNwino06wTFQn-5NVBBbmaF/view?usp=s...
Mike,
Thank you for posting those great audio recordings! It's snippets of successful contacts like keep me interested in getting into microwave (satellite or terrestrial).
--- Zach N0ZGO
The Chinese lunar satellite DSLWP-B seems to have x-band transmissions for images.
https://twitter.com/bg2bhc/status/1007206364727291904?s=19
"*13 June 2018* IW1DTU reported strong X-band signals on 8478.000 MHz from DSLWP-B"
http://dk3wn.info/blog/satelliten/dslwp/
73, John Brier KG4AKV
On Mon, Jul 16, 2018, 17:19 Zach Metzinger [email protected] wrote:
On 07/16/18 17:52, Mike Seguin wrote:
Here's my reception of Charlie's signal - our first successful L/k
contact:
https://drive.google.com/file/d/1J_U7GIdrCr7A12XTqYmgs9L4HATyaMOJ/view?usp=s...
Here's Charlie's audio of me:
https://drive.google.com/file/d/13ffNjzyZcWNwino06wTFQn-5NVBBbmaF/view?usp=s...
Mike,
Thank you for posting those great audio recordings! It's snippets of successful contacts like keep me interested in getting into microwave (satellite or terrestrial).
--- Zach N0ZGO
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 7/16/2018 07:29, Samudra Haque [TTLLC] wrote:
What is the status of those frequencies in terms of past, present or planned utilization on AMSAT / other satellites ?
GOLF-TEE will have a 10 GHz downlink, GOLF-1 is planned to have a 5 GHz uplink and 10 GHz downlink. https://www.amsat.org/greater-orbit-larger-footprint-an-introduction-to-the-...
Jerry Buxton, NØJY
Thank you all posters on this thread for the great set of information
Samudra N3RDX
-----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Samudra Haque [TTLLC] Sent: Monday, July 16, 2018 8:29 AM To: [email protected] Subject: [amsat-bb] seeking info on AMSAT (any platform) utilization of >2 GHz frequencies
Hi, I am experimenting with RF carriers above 2 GHz in my lab. According to FCC and ITU tables there are several AMATEUR-SATELLITE bands allocated above 2 GHz, to very very high frequencies.
What is the status of those frequencies in terms of past, present or planned utilization on AMSAT / other satellites ?
If those bands haven't been used, should they be not used or plans to use them to protect them from being de-assigned to other services? Is there room for experimental RF super high frequency and extremely high frequency payloads on any mission to make some use of these great resource?
73 de Samudra N3RDX The information contained in this communication is confidential, may be privileged and is intended for the exclusive use of the above named addressee(s). If you are not the intended recipient(s), you are expressly prohibited from copying, distributing, disseminating, or in any other way using any information contained within this communication. If you have received this communication in error please contact the sender by telephone or by response via mail. We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. _______________________________________________ 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 The information contained in this communication is confidential, may be privileged and is intended for the exclusive use of the above named addressee(s). If you are not the intended recipient(s), you are expressly prohibited from copying, distributing, disseminating, or in any other way using any information contained within this communication. If you have received this communication in error please contact the sender by telephone or by response via mail. We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. The information contained in this communication is confidential, may be privileged and is intended for the exclusive use of the above named addressee(s). If you are not the intended recipient(s), you are expressly prohibited from copying, distributing, disseminating, or in any other way using any information contained within this communication. If you have received this communication in error please contact the sender by telephone or by response via mail. We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses.
participants (7)
-
Eric Fort -
Jerry Buxton -
John Brier -
Mike Seguin -
Samudra Haque [TTLLC] -
Zach Leffke -
Zach Metzinger