[amsat-bb] Falconsat-3 and APRS HT's?

Roy Dean royldean at gmail.com
Tue Oct 3 12:07:58 UTC 2017


You are going to have a very hard time copying Falconsat with
omni/whip antenna's.   Yes, it's a strong downlink, but "strong" for
amateur satellites is misleading... It's nowhere near as strong as the
ISS voice radio, for example, which is easily picked up on my scanner

It's supposed to be over one watt, but I can pick up AO-85 with a
stronger signal, if that gives you any idea.   Also, Falconsat has
some really serious polarity fade, so there's another issue.   I can
go from roughly S7 to 'nuttin by rotating my arrow 10°.


> Ok, so I must be doing something wrong.  I have an RTL-SDR dongle hooked
> to a deep-fringe TV antenna in the attic which is my all-purpose scanner
> setup.  I can barely make out the 9600 baud downlink from FalconSat-3 in
> the GQRX Waterfall, seeing a good bit of fading during the pass.  At
> best it's a faint bar; mostly not there at all.  My D74 hand-held, with
> a Diamond RH-77B whip antenna decodes nothing, assuming there was
> something to decode.  Tried this on 3 passes this afternoon.  Nada.
> APRS traffic on 145.39, by comparison, shows up really well.
> I thought I read that the satellite had a nice strong downlink.
> 435.103, plus or minus.  I've not done much of anything with 9600 baud
> packet, so don't have much experience to draw from.  What's wrong?
> Equipment, operating, or expectations?
> Greg  KO6TH

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