[EMAIL PROTECTED] wrote:
Silk purse from a sow's ear?
First of all, I want to thank the several people who have helped by
sending me scans of the Argonaut 515 schematics or who have offered to
copy the manual. I really am overwhelmed by the kindness of K6VNL,
K0EVZ, K4ZM, W2XS, and others.
I don't think the 515 is exactly a sow's ear. It is a single-conversion
design, like the K2, and Tentec abandoned the mickey-mouse practice of
multiplying the VFO output that they had used in the 509 in favor of a
pre-mix scheme to provide the injection frequencies. The 9 MHz IF came
with a 4-pole filter, which was probably a poor choice. Some owners
replaced it with the better 8-pole filter from the 540, which has been
done to my radio.
My plan is to see what I can learn in the process of evaluating the
performance of the receiver in this radio and trying to improve it. The
modular construction should be a help in this.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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