Fw: AM Crystal filter for SB-303

[Dave Edwards]

I have a large size SB300 filter that I am using with
one of my SB303's.
It is too large for proper mounting, so I used double
sided tape and attached it somewhere on the chassis.
wired it as per manual, and it works great!
..Dave





Quoting Eddy Swynar <gswynar at DURHAM.NET>:

> Yes, the large-sized SSB filter from the SB-300 that
I took apart did,
> indeed, have a micro-mini toroid as part of the L/C
network therein---but
> there was also a super-small mini ceramic trimmer
there, too...
>
> The smaller-sized SSB filter that I dis-assembled (SB-
301) had what looked
> like a couple of transistor radio-sized IF cans
inside it.
>
> In any event, I would recommend simply swapping out
four of the crystals
> with new ones cut for the AM bandwidth. PERIOD. The
extra two other
> crystals
> in the SSB filter can be removed as well, as the AM
filter utilizes but 4
> crystals in total.
>
> ~73~ Eddy VE3CUI - VE3XZ
>
>
>
> ----- Original Message -----
> From: "w1id" <w1id at fcgnetworks.net>
> To: "Eddy Swynar" <gswynar at DURHAM.NET>;
<HEATH at LISTSERV.TEMPE.GOV>
> Sent: Wednesday, February 28, 2001 1:26 PM
> Subject: Re: Fw: AM Crystal filter for SB-303
>
>
> > On Tuesday, February 27, 2001 at 08:07:16 PM, Eddy
Swynar wrote:
> >
> > > Hi All...
> > >
> > > Can anyone reading this tell Larry if the SB-301
type IF filters are
> directly interchangeable (sp?) with those used in the
newer SB-303...?
> > ----------------------------------------------------
-----------
> > They are all interchangable, all the same impedance
and characteristics.
> You can mix and match as long as they are all the
same size. Other than
> that, you'd have to drill holes to make thme fit, but
then again, they'd
> still work. As far as building or homebrewing a 5KHz
AM filter is
> concerned,
> I've opened up one of my excess SSB filters and
didn't see an adjustable
> coil. Only saw a fixed, multifilar toroid inductor.
It probably reads close
> to what the author of the AM filter post was talking
about. No big deal.
> I've been wanting to build one but have been
sidetracked by other projects.
> Seems like the Jan Crystals option would be a good
way to start instead of
> having to pay $110, which is more than I paid for my
SB-300/401 twins and
> about twice what I paid for my SB-303. I know Inrad
used to sell those
> filters a long time ago so they must still have
the "receipe" somewhere.
> > w1id
> > e-mail: w1id at fcgnetworks.net
> >
> >
> >
> >
>
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