[TenTec] 1254 Receiver selectivity: crystal or Q-Multiplier?

[ve1bn@ns.sympatico.ca]

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 at ns.sympatico.ca



----- Original Message ----- 
From: "Bwana Bob" <wb2vuf at qsl.net>
To: "Ten Tec" <tentec at 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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