On Sun, 17 Jun 2007 12:21:06 -0400, Uncle Peter wrote:

"Michael Black" wrote in message
...
=?iso-8859-1?B?Rm9y52FDZWx0YQ==?= ) writes:
Hello,

It depends on what you need. Don't forget that the first single signal
selectivity came to receivers in the thirties, via a single crystal
filter.
I'm suddenly blank about the name, but it was a balanced transformer
feeding a crystal on one side and a trimmer capacitor on the other. You'd
trim out the crystal holder's capacitance with the trimmer.

Lamb? WAG.

IIRC, that's what the BC-348 employed. My BC-348 has several
inspection stampings dating to circa 1938-39.

73
Jonesy W3DHJ

--
Marvin L Jones | jonz | W3DHJ | linux
38.24N 104.55W | @ config.com | Jonesy | OS/2
*** Killfiling google posts: http://jonz.net/ng.htm