Hi Gary, I find there is no advantage provided there are not strong signals
on the band, which can drive the soundcard into non-linearity. As I often
use the card at "too high" a level, so that I can hear the morse on the PC
speakers, I do find a filter helps when there are others around. I am not
sure whether the audio filter has this advantage unless you are sure that
the RX is not overloading. To get round this I use the IF filter on the RX,
to say just bracket the DX window at night. Under normal conditions an audio
filter will gibe no advantage in fact it might even add noise. I have
sometimes used a notch to do the same thing, but that was some year or two
back. The ARGO FFT system is actually a series of very sharp audio filters,
after all.
I hope you didnt get too much more damage in the lastest winds.
Cheers de Alan G3NYK
[email protected]
----- Original Message -----
From: "Gary - G4WGT" <[email protected]>
To: "LF (Rsgb LF Group)" <[email protected]>
Sent: 12 January 2005 20:10
Subject: LF: Audio Filters
Hi All at LF,
Is it useful to use a audio filter like the DATONG FL3 MULTI-MODE AUDIO
FILTER WITH NOTCH FILTER to help with QRSS receive on LF, does anyone use
one or similar? I don't have one but see the odd one or two crop up on
E-Bay
at reasonable prices.
Your comments appreciated.
Regards
Gary - G4WGT
Web: http://myweb.tiscali.co.uk/wgtaylor
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