WTB: AM FILTER

[Eddy Swynar]

Hi Gerald...

I was the fellow who built the SB-310 AM filter "clone"...

You're correct: it was NOT cheap, as such---besides the price of 4 custom
cut crystals, you also incur the expense of a "regular" Heath SSB filter,
which is used as the foundation for your new AM jobbie.

Still, considering the rarity of the '310 filter (and the price, should be
be lucky enough to find one!), the effort is certainly worth it. I would say
that the cost of construction, as compared to some of the prices seen on
eBay, make it an even draw...

Oh yes, there IS one added benefit: you're actually doing some
honest-to-goodness, time honoured, Ham inspired HOMEBREWING by rolling your
own, & to me that's almost priceless!

~73~ Eddy VE3CUI - VE3XZ




----- Original Message -----
From: "Gerald C. Lemay" <wa1vwl at GROLEN.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, August 21, 2000 6:24 PM
Subject: Re: WTB: AM FILTER


> That won't work. It's already been tried by several people. Bandwidth will
likely be 50
> to 100 KHz wide. This is what happens when you have a high IF frequency
such as 3.395
> MHz. It's all a matter of frequency versus percent bandwidth. There was a
thread a while
> back about building a crystal filter with 4 crystals the builder obtained
from Jan
> Crystals. It wasn't cheap but then, neither is a 5 KHz filter if and when
you find one .
>
> Ed Richards wrote:
>
> > If you want it that wide, try it without any filter. Just put a small
> > capacitor across the switch contacts.
> > Regards,
> > Ed Richards
> >
> > On Sun, 20 Aug 2000 22:08:11 -0700 Peter Havens
> > <pjhavens at CYBERTRAILS.COM> writes:
> > > Ya'll can laugh if you like, BUT I really am looking for a 3.75 kc
> > > filter
> > > for the '301/303, etc. Actually, I would prefer the 5.0 kc unit, but
> > > who
> > > wouldn't....
> > >
> > >                                                   Peter Havens
> > >                                                   KA2SQJ
> > >
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