[Elecraft] OT: Argonaut help needed

[Vic K2VCO]

w6jd at comcast.net 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