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From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.swap,rec.radio.cb,misc.forsale,ne.forsale,sci.electronics
Subject: Re: TRF Receiver
Message-ID: <1991Apr9.220744.4049@milton.u.washington.edu>
Date: 9 Apr 91 22:07:44 GMT
References: <1991Apr9.124118.27031@mlb.semi.harris.com>
Distribution: na
Organization: University of Washington, Seattle
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In article <1991Apr9.124118.27031@mlb.semi.harris.com> rps@sunman.mlb.semi.harris.com (Ray Sumperyl) writes:

> Can anybody supply me with a schematic for a tube TRF receiver?

	No such devices have been built by THAT name in most of
a century.  Any of the '60s vintage Radio Amateur Handbooks, though,
will have 'grid-dip meter' construction articles, and a grid
dip meter is exactly a TRF receiver (not terribly sensitive, though,
as they usually leave out the preamplification).  After mid-60's,
the grid-dip meters used MOSFETs (what's a 'grid' in a MOSFET?).

	John Whitmore