I did some SSTV years ago via AO-40. Really fun. But with a LEO satellite, you will need to be actively adjusting for Doppler shift in real time, as SSTV is frequency sensitive. You might try some of the faster modes, especially since a pass is over in just a few minutes. Greg KO6TH
I just did a dry run with my station, and think I'm ready to try an actual pass. I will be operating in "Robot36" mode on CAS-4B (17:00z) and CAS-4A (17:30z) this afternoon as first attempt. I plan on shooting for the lower portion of the 2m passband (going to target the lowest published downlink frequency). I will likely announce several times prior to first transmitting to fine tune. My test image is very simple black and white call/grid. If anybody hears it, please feel free to respond with an image (short notice, I know), or voice. If you don't hear me, then something came up to pull me away from my computer or I simply can't get in.
--Roy K3RLD
Roy,
Have you checked this out with the control ops? I don't know but are there any duty cycle issues to worry about? And given that a linear transponder has a finite power budget what does it do to the other users? Maybe not a big deal but I wonder if the sys ops for these birds have any words of wisdom for us before we all start cranking up MMSSTV and banging away.
John
On Tue, Dec 31, 2019 at 11:14 AM Roy Dean via AMSAT-BB amsat-bb@amsat.org wrote:
I did some SSTV years ago via AO-40. Really fun. But with a LEO satellite, you will need to be actively adjusting for Doppler shift in real time, as SSTV is frequency sensitive. You might try some of the faster modes, especially since a pass is over in just a few minutes. Greg KO6TH
I just did a dry run with my station, and think I'm ready to try an actual pass. I will be operating in "Robot36" mode on CAS-4B (17:00z) and CAS-4A (17:30z) this afternoon as first attempt. I plan on shooting for the lower portion of the 2m passband (going to target the lowest published downlink frequency). I will likely announce several times prior to first transmitting to fine tune. My test image is very simple black and white call/grid. If anybody hears it, please feel free to respond with an image (short notice, I know), or voice. If you don't hear me, then something came up to pull me away from my computer or I simply can't get in.
--Roy K3RLD _______________________________________________ Sent via AMSAT-BB@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! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Heard you but was caught off-guard... I assumed you would TX on FM, but it seemed to be the normal USB downlink.
Won't be around for the upcoming CAS-4A pass, but have fun & good luck!
-Scott, K4KDR
=======================
On Tue, Dec 31, 2019 at 11:13 AM Roy Dean via AMSAT-BB amsat-bb@amsat.org wrote:
I did some SSTV years ago via AO-40. Really fun. But with a LEO satellite, you will need to be actively adjusting for Doppler shift in real time, as SSTV is frequency sensitive. You might try some of the faster modes, especially since a pass is over in just a few minutes. Greg KO6TH
I just did a dry run with my station, and think I'm ready to try an actual pass. I will be operating in "Robot36" mode on CAS-4B (17:00z) and CAS-4A (17:30z) this afternoon as first attempt. I plan on shooting for the lower portion of the 2m passband (going to target the lowest published downlink frequency). I will likely announce several times prior to first transmitting to fine tune. My test image is very simple black and white call/grid. If anybody hears it, please feel free to respond with an image (short notice, I know), or voice. If you don't hear me, then something came up to pull me away from my computer or I simply can't get in.
--Roy K3RLD
PLEASE do NOT use FM on a linear transponder!!!
There are very good reasons why there are FM satellites and there are linear satellites. FM on a linear passband screws things up in a number of ways, as can be heard whenever a linear has Mexican taxi cabs in its footprint.
Please, just don’t even suggest such a thing.
On Tue, Dec 31, 2019 at 11:30 Scott via AMSAT-BB amsat-bb@amsat.org wrote:
Heard you but was caught off-guard... I assumed you would TX on FM, but it seemed to be the normal USB downlink.
Won't be around for the upcoming CAS-4A pass, but have fun & good luck!
-Scott, K4KDR
=======================
On Tue, Dec 31, 2019 at 11:13 AM Roy Dean via AMSAT-BB <amsat-bb@amsat.org
wrote:
I did some SSTV years ago via AO-40. Really fun. But with a LEO satellite, you will need to be actively adjusting for Doppler shift in real time, as SSTV is frequency sensitive. You might try some of the faster modes, especially since a pass is over in just a few minutes.
Greg
KO6TH
I just did a dry run with my station, and think I'm ready to try an
actual
pass. I will be operating in "Robot36" mode on CAS-4B (17:00z) and
CAS-4A
(17:30z) this afternoon as first attempt. I plan on shooting for the lower portion of the 2m passband (going to target the lowest published downlink frequency). I will likely announce several times prior to first transmitting to fine tune. My test image is very simple black and white call/grid. If anybody hears it, please feel free to respond with an
image
(short notice, I know), or voice. If you don't hear me, then something came up to pull me away from my computer or I simply can't get in.
--Roy K3RLD
Sent via AMSAT-BB@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! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
participants (4)
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John Kludt -
Mark D. Johns -
Roy Dean -
Scott