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From: georgep@vice.TEK.COM (George Pell)
Newsgroups: sci.electronics
Subject: Re: if transformer?
Message-ID: <1918@vice.TEK.COM>
Date: Wed, 23-Sep-87 17:27:09 EDT
Article-I.D.: vice.1918
Posted: Wed Sep 23 17:27:09 1987
Date-Received: Sat, 26-Sep-87 11:03:35 EDT
References: <IVImuXy00Uo5Q7c0jH@andrew.cmu.edu>
Organization: Tektronix Inc., Beaverton, Or.
Lines: 22

In article <IVImuXy00Uo5Q7c0jH@andrew.cmu.edu>, sr16+@andrew.cmu.edu (Seth Benjamin Rothenberg) writes:
> I am trying to build a circuit I found in an old Lafayette Electronics
> Book (from before it became Lafayette Department Stores), but
> I am not sure it is legal now.  It uses 'i-f transformers' to transmit
> an audio signal over an AC line at 400KHz.  The Radio Shack
> salesman near me said that the FCC now allows only 46-49Mega Hz
> for this type of stuff.  Is this true?  Does anyone know where I
> can get so-called if transformers?  If the above-mentioned
> circuit is not legal, is there a circuit around that is?

Your first mistake was to believe the Radio Shack salesman.  He
doesn't know what he is talking about.  Radio Shack even sells
devices (wireless intercoms, BSR remote controllers, etc) which
operate over the AC line.  These do not operate at 46-49 Mhz, but
at the Khz frequency range.

You should be able to find a replacement IF transformer, used for
AM superhet radios, hanging on the parts rack at Radio Shack. 

Find yourself a more knowledgeable salesman.

geo