Re: {Collins} 51S-1 AGC Modification Question



Good evening, Craig.

Uli, DK4SX, came up with the following mod a couple of months ago to solve that problem.  I tried it in my winged-emblem 51S-1 and it works great.

"Connect the series combination of a non polarized 4.7 uF (microfarad) capacitor and a 10 kOhms resistor in parallel to R73 and C192. Do not alter those values or remove R73 and C192. They are needed for a correct and quick response in case of the beginning of speech syllables in ssb etc. Location is easily found on the parts photograph page 6-13 in the handbook."

Amazingly enough, I was able to find a 4.7-uF non-polarized capacitor at the local Radio Shack.  Wonders never cease.

Note that you only want to lengthen the decay time, not the attack time.

Rick WA1RKT
Londonderry, NH
Catch me on 14.300 MHz Intercon / MMSN most days


----- Original Message -----
From: "Craig Anderson" <w9cla@xxxxxxxxxxxxxxxxxxx>
To: "collins" <collins@xxxxxxxxxxxxx>
Sent: Sunday, November 16, 2014 7:13:48 PM
Subject: {Collins} 51S-1 AGC Modification Question

I have a mid-1973 RE 51S-1 and it works great but the AGC time constant is
very fast which is great for digital modes but not SSB.  Is there a mod out
there for lengthening the AGC attack and decay times?

Craig W9CLA



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