Questions about crystal filters on Heath product line

[Ed Kotkiewicz]

"Paul R. Young" wrote:

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

EK> Just as a sidebar, you can drop the "M" and "Pxxx"  They merely say that the case is
"M"etal and the Pxxx is a paint number.  They do not have any performance significance.

This is a interesting issue that repeats itself again and again.  I have a slightly larger
file then what is stated above.  Some of the earlier equipment filters (SSB and AM but not
CW) had filters with tighter specs.  For instance, the HW-100 filters are tighter spec
then the HW-101.

And Bob,  the only thing to feel stupid about on this reflector is to NOT ask a question.
There are a lot of very helpful people here on the reflector.  I made a recommendation
some time ago to Dave (or moderator) that we really needed to have a place to point
newbies to for answers to repeated questions.  This is kind of hard since some guys get
mail only.  Sure would be nice though.  I point a lot of folks to Dale Wentz's Heathkit
site for service bulletins.

Ed

> 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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