[amsat-bb] HF Satellite Transponder
glasbrenner at mindspring.com
Thu May 26 22:17:37 UTC 2016
It was extremely strong. I often worked it listening with a magmount antenna. 2w and 20khz would work fine.
73, Drew KO4MA
> On May 26, 2016, at 5:42 PM, Robert Bruninga <bruninga at usna.edu> wrote:
> I find that RS12/13 had 8 watt transponders. WOW! That's for 40 kHz
> 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 at 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.
>> Paul, N8HM
>> On Thu, May 26, 2016 at 1:45 PM, Robert Bruninga <bruninga at usna.edu>
>>> 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.
>>> Bob, WB4aPR
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> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
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> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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