|[AMRadio] AM filter for an SB-300|
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
> 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
> 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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