[TenTec] InRAD 2.1 kHz Filter for the Argonaut 509 (The Argo from Hell)

[Geoffrey S. Mendelson]

Richard Arland wrote:
> Gang:

Two Argo 509 questions:

1. Have you thought about replacing the Dual gate MOSFET in the front end
   with a 3n211? I once read that the mod was "drop in and tweak", giving
   beter sensitivity and the 3n211 has built in overvoltage and static 
   protection? Has anyone seen this mod documented?

2. I dug up my argo 509 today and found it has one problem. The dial pointer
   won't go below .075. Otherwise the rig works fine, and the tuning 
   using the dial skirt numbers is accurate.  The PTO is in good shape, 
   so besides from astetic (sp?) concerns should I fix it?

   Is it an easy fix? To me it looked like the front cover had to come
   off which does not seem easy.

Thanks and 73,

Geoff (N3OWJ,4X1GM)
-- 
Geoffrey S. Mendelson, Jerusalem Israel gsm at mendelson.com 
IL Voice: 972-544-608-069  IL Fax: 972-2-648-1443 U.S. Voice: 1-215-821-1838 
I may be an old fart, but I'm a high-tech, up to date old fart. :-)