Hi Nitin,
This circuit works great as Audio LP filter. I use it in my Bitx20 with great results.
Filtering high frequencies spikes it also reduce the need for an AGC.
http://lpistor.chez-alice.fr/filtrebf.htm
Try to look for circuit using MAX293 or similar (MAX291 or 292 use Butterworh or Bessel, not elliptic filters), you will find a lot on internet.
Some also includes an active HP filter built around an OP-Amp.
Sometime this kind of filter is called SCAF.
73 and HNY,
Yan.
---
Yannick DEVOS - XV4Y
http://xv4y.radioclub.asia/
http://varc.radioclub.asia/
http://www.qslwatch.com/
Le 22 déc. 2011 à 23:19, Nitin Muttin a écrit :
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> Has anyone got any simple noise cancelling circuits either dsp or otherwise which would remove the high tones on ssb reception, this includes the background radio noise. I understand that there was an article in the QST November 2011 issue.
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> 73's
> Nitin [VU3TYG]
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