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

[Bwana Bob <wb2vuf@qsl.net>]

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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