[AMRadio] AM filter for an SB-300


Brian Carling bcarling at cfl.rr.com
Sun Apr 9 15:54:05 EDT 2006


You can find those AM filters around.
I found one for about $35 - 40 for AM on my SB300 the best 
that I remember.

I have seen some for more, but just watch eBay. A lot 
less work than making your own, and not too expensive 
usually!
 
> Mark W1EOF wrote:
> 
> >Probably a long-shot, but I gotta ask: Do any of you have experience either
> >making a AM bandwidth filter, or modifying a SSB filter for a SB-300 or
> >similar receiver? I have one article on modifying a SSB filter by installing
> >four new crystals. Given the expense of buying four crystals I've been
> >re-thinking it.
> 
> I just did exactly this.  I tried modifying an SSB filter - no luck at all.  
> The closest I could get was to eliminate two of the crystals but the blow-by 
> outside the main passband was unbearable.  Then I changed the four crystals in 
> the SSB filter to the frequencies in a Heath AM filter - that worked really 
> well.  To keep the costs down I got the crystals from Petersen Radio at $11 
> each.  
> 
> I used my spectrum analyzer with tracking generator to confirm operation and 
> tweak the parallel cap values.
> 
> Steve WD8DAS
> 
> sbjohnston at aol.com
> 
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