[Elecraft] R1 and the AGC

[Kevin Cozens]

At 08:33 AM 09/16/2003 -0700, Earl, K6SE wrote:
>On K2s with S/Ns 3000 and above, R1 is a pot.  The procedure for
>adjustment is to set it for 3.8 to 3.9 VDC on pin 5 of U2 on the control
>board (this is from memory -- if I'm wrong, others please correct me).
[snip]
>If your 8-volt regulator outputs a bit more than 8.00 VDC, R1 will have
>to be set to a value considerably lower than the nominal 50k.  My
>regulator outputs 8.32 VDC, so my final value for R1 was about 22k.

I have a similar problem. My 8V regulator is putting out 8.45V. I have put 
some trim pots in place of R1 so I can play with its value. Since the new 
K2's have a pot for R1, I will look at the latest manual on the web site 
and see what the procedure is for getting the right value since I have yet 
to read the conditions one needs to set up when looking for 3.8V on pin 5 
of U2. Based on the quoted text above, I will expect to wind up with a 
value less than 22K. The initial adjustments I have made have helped. It is 
now starting to hear as well as a shortwave receiver nearby.


Cheers!

Kevin.  (http://www.interlog.com/~kcozens/)

Owner of Elecraft K2 #2172        |"What are we going to do today, Borg?"
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