[TenTec] Argosy "Thump"

[ynkedragon at aol.com]

 I made the recommended change of C12 in my Argosy and found it to be a major improvement to this great little radio.  I did not continue with the suggested addition of a r.f. gain control 'cause I really didn't think I needed it after the capacitor change.
 
 73 de K3YD
-----Original Message-----
From: nn8b at yahoo.com
To: TenTec at contesting.com
Sent: Thu, 17 Aug 2006 9:00 AM
Subject: Re: [TenTec] Argosy "Thump"


I have the complete article run in Ham Radio Magazine
in 1986 about mods for the Argosy.

The mod for the AGC is:

"Improving audio AGC characteristics 
One of my biggest complaints was the popping
characteristic of the Argosy's audio AGC. While most
of the modifications presented so far improve to a
great degree the AGC's reaction to unwanted
out-of-band signals and in-band background noise, a
simple additional modification will virtually
eliminate popping. This change consists of replacing
C12 on the i-f/af board 80785 with a 22-uF, 35VDC
tantalum capacitor, which exhibits a favorable
charging curve that cancels out the annoying "pop," at
the same time providing a more suitable response time
for the AGC. With this capacitor in place, the attack
and release times were measured at 20 milliseconds and
2 seconds, respectively. This constitutes an almost
perfect compromise between CW and SSB. 
 
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