[amsat-bb] FM signal on FO-29?

[Zach Leffke]

Sweet, second cross link signal to look into!  I missed that, you got 
the gears turning.......

So lets see....  145.900MHz to 146.000MHz for FO-29 passband.

A quick look through JE9PEL satlist reveals these downlinks:

AO73 tlm bcn, 145.935 MHz
AO73 transponder, 145.970-145.950 MHz
AO85, 145.978 MHz
First-MOVE cubesat (NORAD ID 39439), 145.970MHz
DUCHIFAT, 145.980 MHz
QB50p1/FUNcube3 (EO-79) transponder, 145.970-145.945 MHz
VELOX-I, 145.980 MHz
UKube-1/FUNcube-2, 145.915 MHz
DeorbitSail, 145.975 MHz
CAS-3E (XW-2E) transponder, 145.935-145.915 MHz
CAS-3F (XW-2F) transponder, 146.000-146.980 MHz
Fox-1B, 145.960 MHz
Fox-1C, 145.920 MHz

I guess its not that surprising when FO-29 has half of the 2m Satellite 
Service allocation for its uplink.  Next thing to do is figure out which 
ones are the most likely to be successful based on power levels, 
modulation schemes, transmission rate, which ones are using Forward 
Error Correction, etc.  And then look at the orbits for possible chain 
events.

fun stuff!

Does anyone know the uplink receiver sensitivity and antenna gain/design 
on FO-29?

-Zach, KJ4QLP


On 11/08/2015 05:33 PM, Paul Stoetzer wrote:
> Speaking of FM signals on FO-29, you'll be able to hear the AO-85
> transponder through FO-29 when their paths cross as well. I wonder if
> you could get a high enough SNR to decode the DUV...
>
> 73,
>
> Paul, N8HM
>
> On Sun, Nov 8, 2015 at 5:30 PM, Clayton W5PFG <w5pfg at amsat.org> wrote:
>> I wouldn't recommend playing the FM audio heard via FO-29 to a group of
>> children. Normally it's not English.  It's most likely NOT a religious
>> broadcast based on their choice of crude words.
>>
>> 73
>> Clayton
>> W5PFG
>>
>> On 11/8/2015 16:13, Zach Leffke wrote:
>>> So yes, in the last couple weeks I've seen a LOT of FM activity on
>>> FO-29.  And based on my experience with Friday's pass, which was
>>> ascending, I'm leading towards the Central/South America QRM theory.
>>> Lots of strong FM activity as the pass started and the satellite was
>>> over the lower latitudes, but as FO-29 ascended over higher latitudes
>>> towards the north pole, the FM activity died down.
>>>
>>> -Zach, KJ4QLP
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