Re: [TenTec] #218 filter

["J.Reed" <jhreed@chilitech.net>]

John, I'm probably way off base on this but wouldn't CwGet waterfall simply 
show the DSP bandwidth?  Nothing to do with the roofing filter that I can 
see.... of course, I may be wrong... what do you think?  Jim Reed, W3RYJ.
  ----- Original Message ----- 
  From: John T. Fleming 
  To: 'Discussion of Ten-Tec Equipment' 
  Sent: Tuesday, October 03, 2006 14:34
  Subject: Re: [TenTec] #218 filter


  Bob,

  Thanks for the idea.  I am going to put the 218 in my Orion and use either
  CWGet or a PSK31 program and watch the waterfall screen for the noise
  pattern.  This should give me a good idea what the filter is doing.

  Thanks.

  73,
  John

  -----Original Message-----
  From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
  On Behalf Of Bob Cunnings
  Sent: Tuesday, October 03, 2006 2:06 PM
  To: Discussion of Ten-Tec Equipment
  Subject: Re: [TenTec] #218 filter

  Another way, if you have a PC with a soundcard, is to use a spectrum
  analyzer program like Spectrogram  to characterize the filter using
  band noise as input.

  This is the technique used by K2 builders to set up the adjustable IF
  filters. I used this approach to find the centering adjustment for the
  218 and 217 filters in my Orion (I used a program called Spectrum Lab,
  found at http://www.qsl.net/dl4yhf/ ).

  Bob NW8L



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