Questions about crystal filters on Heath product line

[Paul R. Young]

Bob,

I have a limited amount of info on these filters but you can add it to yours.

What you call the "smaller case"  is approx 2 1/4 in long x 7/8 in wide and
has mounting holes approx 1 1/4 in apart.  The filter terminals are approx
1 7/8 in apart.

What you call the "large case" is approx 2 1/2 in long x 1 1/4 in wide and
has mounting holes approx 2 in apart (on diagonal).  The filter terminals
are approx 2 1/4 in apart (on diagonal).

SB-300 uses the 404-M202 P23 CW filter, the 404-M201 P22 AM filter and the
404-200 SSB filter.
SB-301/303 use the 404-284-1 CW filter, the 404-M285 P364 AM filter and the
404-283 SSB filter.

Paul

>Well, I'm feeling a little stupid.  It turns out that there
>have been lots of different crystal filters used on the
>Heath SB-xxx line although it looks like the biggest
>difference is mechanical.  Has anyone come up with a list of
>part numbers, electrical specifications and radio's that the
>various crystal filters were used on?  I have a start based
>on my two radios (an SB-100 and a SB-303) plus some other
>filters I have in my parts box.  All are for 3395 kHz IF and
>all (??) seem to be 2K ohm in and out impedance.  What I
>have so far
>
>404-283    SSB filter, smaller case  Used on SB-303 note 1
>404-548    CW Filter, smaller case,  Used on __???____
>404-284-1  CW filter, smaller case   Used on SB-303 note 1
>
>404-200    SSB filter, large case, used on SB-100 note 2
>404-M201(?) AM filter, ?? case, used on SB-300
>404-200     SSB filter used on SB-300 note 3
>404-202     CW filter used on SB-300  Note 3
>
>Notes:
>1.  Also used on SB-300,301, 310 and 313 according to Penson
>2.  No room in SB-100 for CW filter (??)
>3.  Yes, this is a conflict with note 1 but seems to be the
>case??
>
>So I'm throughly confused.  Don't have manuals for most of
>these rigs.  All help and information throughly appreciated.
>
>Bob Groh, WA2CKY
>
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