[Heath] Fw: AM Crystal filter for SB-303

[Glen Zook]

One problem with the AM filter for the SB-301 and SB-303 is that it is WAY too narrow for decent AM operation.  The AM filter for the SB-300 was 3.5 kHz wide and the AM filter for the SB-301 and SB-303 was 3.75 kHz wide.  That is just way too narrow for good sounding AM audio.
The AM filter that was supplied with the SWL versions, SB-310 and SB-313, is 5.0 kHz wide and the audio does "sound" better than with the 3.5 kHz or 3.75 kHz filters.  However, even the 5.0 kHz filter constrains the audio.
One can get somewhat better sounding AM audio by tuning to one side and, basically, receiving only one side band. Glen, K9STH

Website: http://k9sth.net
      From: Guy Giacopuzzi <gggdds at js-net.com>
 To: heath at puck.nether.net 
 Sent: Monday, December 22, 2014 5:59 PM
 Subject: Re: [Heath] Fw: AM Crystal filter for SB-303
   
 Only the AM section is bad?  To confirm it's the filter, it should only be the am section; after that, I would look at the am detector circuit...I've never heard of a xtal filter "going bad"...
  
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