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Re: DSP Noise Reduction on Receive

on 2/9/03 5:28 PM, Mike Olbrisch at kd9kc@elp.rr.com wrote:

>> 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?

I found the problem.  I had set a manual notch as opposed to the automatic
variable notch.  It appears that even if you don't have the "tone" button
turned on, the manual notch is still in place.  I took it out and now copy
the beacon FB with the DSP.

Thanks for the tip!


Jon Ogden
NA9D (ex: KE9NA)

Citizen of the People's Democratic Republik of Illinois

Life Member: ARRL, NRA
Member:  AMSAT, DXCC

http://www.qsl.net/na9d   <- Updated on 1/22/03!!!

"A life lived in fear is a life half lived."

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