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RE: DSP Noise Reduction on Receive





> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of Jon Ogden
> Sent: Sunday, February 09, 2003 11:12 PM
> To: amsat-bb@AMSAT.Org
> Subject: [amsat-bb] DSP Noise Reduction on Receive
>
>
> Hi gang,
>
> I decided to try an experiment this afternoon and see how
> well my Timewave
> DSP-599zx works for improving the audio SNR on AO-40 signals.
>  Here's what I
> found out:
>
> For the beacon, the Timewave is not very useful.  It appears that the
> Timewave filter response has a suck-out right around 1000 Hz.
>  I'm not sure
> why, but no matter how you tweak either the High Pass or Low Pass
> adjustments, it doesn't take that out.  From what I can tell,
> it looks like
> that part of the audio spectrum is needed to properly decode
> the beacon.

You have something set wrong.  My DSP-599zx is just wonderful on the beacon.
Perhaps you have the notch engaged or something?

Mike.  KD9KC
El Paso, TX


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