[amsat-bb] HF Satellite Transponder

[Andrew Glasbrenner]

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
> 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 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.
>> 
>> 73,
>> 
>> Paul, N8HM
>> 
>> On Thu, May 26, 2016 at 1:45 PM, Robert Bruninga <bruninga at 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.
>>> 
>>> Bob, WB4aPR
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> _______________________________________________
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