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From: "Steve Andrew"
Subject: Re: Another (FM) antenna question
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Date: Sun, 17 Nov 2002 08:17:56 GMT
NNTP-Posting-Date: Sun, 17 Nov 2002 19:17:56 EST
Organization: BigPond Internet Services (http://www.bigpond.net.au)
Steve Andrew wrote in message
> Phil Allison wrote in message
> > "theother_bob" wrote in message
> > news:aiHB9.firstname.lastname@example.org...
> > > Hello,
> > > I have recently aquired an old (I'm guessing late 50's or early 60's)
> > > Packard Bell stereophonic console, model# RPC-17, Tuner 7TU-4. It's an
> > > tube job, and we've been enjoying it, but it won't pick up our
> > > station (93.3 MHz) because it's drowned out by the nearby 92.5MHz
> > broadcast.
> > > Is it possible to either boost the desired frequency or filter out the
> > > undesirable? (without damaging the tuner)
> > ** A directional antenna is your best chance - aimed at the wanted
> > signal.
> > Some use antenna rotators to solve this one.
> > .............. Phil
> Before you go spending money - It might just be worth seeing if you can
> re-align the IF strip to get a narrower bandwidth. I have and old Fisher
> tuner (also tubes) that had the same problem. I tweaked the IF strip and
> far better adjacent channel rejection without compromising the on-channel
> signal. It will also improve the sensitivity somewhat due to the narrower
Also try tweaking up the front end alignment. If a full re-alignment does
not help, I'd be inclined to try a notch filter between the antenna and the
radio. I've seen the DX TV guys totally notch out an offending station that
is within 500KHz of the required carrier. The filter can be made fixed or
variable. The ARRL handbook carries plenty of info on this, otherwise email
me direct and I can send you what circuits and articles I have ready-scanned
on the subject.
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