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R: AO-40 Downconverter IF




----- Original Message -----
From: Terry Schieler <terrys@wirelessusa.com>
To: AMSAT BB <amsat-bb@AMSAT.Org>
Sent: Friday, September 27, 2002 3:47 PM
Subject: [amsat-bb] AO-40 Downconverter IF


> >Hello all,
> >
> >I have recently completed building the WDG-040 2.4 GHz downconverter with
a
> >144 mHz IF for AO-40 reception on my FT-847. The manual says that the
> >converter outputs to 144 mHz, but does not say precisely what 2.4 gHz
input
> >frequency outputs to 144 mHz.
> >
> >In other words, does this mean that 2.4 gHz (even) would come down at 144
> >mHz (even) and that 2401 mHz would actually show up at 145 mHz?  Or would
> it
> >be more likely that 2401 mHz (the actual satellite TX freqency band)
would
> >come down to 144 mHz on my receiver.  I hope my question is clear.
> >
> >Thanks,
> >
> >Terry, W0FM
>

Hi Terry W0FM,

Look at the XTAL frequency of  your converter local oscillator.

If at the end of all frequency multiplication the LO applied to the mixer
is  2256 MHz  than 2400-2256= 144 MHz and 2402-2256= 146 MHz

If it is the case you should receive the AO40 beacon around 145,330 MHz
+/- Doppler

73" de i8CVS Domenico

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