WTB: AM FILTER

[Eddy Swynar]

Hi Ed...

Your logic is true...

...However, in this particular instance, it must be remembered that, unlike
otherwise "normal" receivers as you describe,  the SB-300/301 do NOT employ
the services of IF transformers in their respective IF chains, but rather,
simple parallel L/C circuits.

The selectivity of these rigs is thus all garnered by the IF filter(s). I
would imagine that had "regular" IF transformers been used, the selcetivity
afforded by them would, indeed, have made the bandwidth comfortably wide for
AM, with NO filters whatsoever...

A good thought, though, and one which I tried to execute (but failed
miserably! Hi Hi).


~73~ Eddy VE3CUI - VE3XZ





----- Original Message -----
From: <k6uuz at juno.com>
To: <gswynar at durham.net>
Cc: <k6uuz at juno.com>; <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, August 21, 2000 4:41 AM
Subject: Re: Re: WTB: AM FILTER


> Eddy;
>
> I never actually tried it, but a lot of AM radios don't use a filter,
> other than the bandpass of the I.F strip. Thought it was worth a try. The
> cap is for DC blocking. If you already have a blocking cap in place a
> wire will do fine. Don't forget, you can fit several SSB stations into a
> 6 KC bandpass, so expect to hear more stations in a crowded band.
>
> 73,
> Ed Richards
>
> On Mon, 21 Aug 2000 12:09:53 -0400 "Eddy Swynar" <gswynar at durham.net>
> writes:
> > Hi Gang...
> >
> > Well, I never did try that capacitor trick you're referring to, Ed,
> > but one
> > time I DID simply insert a piece of wire where the filter would
> > normally
> > have gone, & it seemed like the receiver (an SB-301) was hearing the
> > ENTIRE
> > radio spectrum---at once!
> >
> > I'd be interested in how the capacitor thing might work---could put
> > a damper
> > on the retirement plans of more than one eBay salesman! Hi Hi...
> >
> > ~73~ Eddy VE3CUI - VE3XZ
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Ed Richards" <k6uuz at JUNO.COM>
> > To: <HEATH at LISTSERV.TEMPE.GOV>
> > Sent: Monday, August 21, 2000 12:39 AM
> > Subject: Re: WTB: AM FILTER
> >
> >
> > > 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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>

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