Re: demodulating UO-11 Telemetry

["John A. Magliacane" <kd2bd@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

> 
> P. HADDOCK escribi=F3:
> > =
> 
> >         I was wondering if anyone out there has used the hamtronics DE-=
> 202
> > before to demodulate the 1200 bps FM AFSK telemetry from UO-11. The UO-=
> 11
> > uses AFSK tones of 1200 Hz (logic "0") and 2400 Hz (logic "1").  Any
> > comments regarding using this demodulator would be appreciated.
> > =
> 
> > 73.. Paul
> > =
> 
> 
> I think it is PSK not AFSK, isn't it?
> 

It's phase-coherent AFSK on an FM carrier, at least on 145.826 MHz.

G3RUH designed a nice demodulator many years ago.  It uses correlation
decoding techniques capable of receiving signals that are not exactly
noise-free.  I've used both the G3RUH UoSAT demodulator in addition to
a simple XR2211-based PLL demodulator for UoSAT-OSCAR-9 and -11 reception
with excellent results.  A standard narrow-band FM receiver is all that
is required for reception.


73, de John, KD2BD

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