I find that RS12/13 had 8 watt transponders. WOW! That's for 40 kHz bandwidth.
Or if one user was in the passband, then he got all 8 watts!? That coiuld be a very loud signal? What was Mode A and KT downlinks like? Were they armchair copy or pull them out of the noise contacts?
To get down to say the 2 watt level for a cubesat, then this suggests only a 10 kHz wide transponder. And with 3 kHz signals, that could only be 3 signals. AND, what is it like near the edges of a super narrow filter? Does the steep phase changes on the edge of the filter then distort SSB?
Bob, WB4APR
On Thu, May 26, 2016 at 1:49 PM, Paul Stoetzer n8hm@arrl.net wrote:
A 15 to 10 Mode K satellite would be fun. 12 meters is allocated to the Amateur Satellite Service, of course, but the limited bandwidth of the band might cause conflicts if the satellite continues to function when the solar cycle starts to perk up again. 15 meters, on the other hand, has plenty of room, especially if you put the uplink somewhere above 21.400.
73,
Paul, N8HM
On Thu, May 26, 2016 at 1:45 PM, Robert Bruninga bruninga@usna.edu wrote:
I may have a launch opportunity for an HF=HF transponder for a possible cubesat idea. Probably something like 12m up and 10m down?
Is this worth doing (re-doing) at this point of technology? Enough bandwidth to support a few voice channels?
Any volunteers to build the translator board?
How is 24 MHz band used? The entire SSB portion of the band is only 60 kHz, so using say 15 kHz for a linear translator to 10m would be quite a slice. But then the downlink at 10m would be OK since it does have an exclusive satellite band and so any inadvertent QSO's would be coming down in a non-competing downlink
Just some open ended thinking after Dayton.
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