Bwana Bob -
I have a 455 kc/200Hz filter. Have no need for it now that I no longer
make any highly selective IF strips. Commercially made by
Filtronetics.
Can send you a photo or two of it if you are interested. It is metal
cased for lowest blow-by, etc, and plugs in, two pins each bottpm
end.
Don, ve1bn@ns.sympatico.ca
----- Original Message -----
From: "Bwana Bob" <wb2vuf@qsl.net>
To: "Ten Tec" <tentec@contesting.com>
Sent: Tuesday, December 27, 2005 6:52 PM
Subject: [TenTec] 1254 Receiver selectivity: crystal or Q-Multiplier?
I would like to improve the SSB/CW selectivity of my 1254 receiver.
455 kHz filters narrower than 4 kHz are very expensive. I thought of
trying to make a filter out of 455 kHz ceramic resonators, but then I
started thinking back to my Novice days and the Q-Multiplier. Has anyone
seen a schematic of a solid-state I.F. Q-Multiplier. It certainly would
be easy to connect, because it would shunt the second mixer output , so
I wouldn't have to cut into the I.F. chain. I want to avoid cutting the
PCB.
BTW, the 1254 is a very nice receiver, stable, sensitive, built like a
tank with its steel case, and it doesn't overload.
73,
Bob WB2VUF
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