[Elecraft] Serial 3000+ K2: AGC threshold setting

Wed Jan 22 23:27:00 2003

Hi

This problem may be the wrong value pot. It should be 50K. I have two
control boards that work properly and the resistance measured across the pot
is about 9.5K with the proper calibration. The pot is at the half way point
on the adjustment range. Try measuring across your pot and if you get about
9K at full clockwise if so, then the pot is the wrong value.

Don Brown
KD5NDB

----- Original Message -----
From: "Dwight K9ERF" <[email protected]>
To: "Wallace, Andy" <[email protected]>; "'Elecraft'"
<[email protected]>
Sent: Wednesday, January 22, 2003 5:25 PM
Subject: Re: [Elecraft] Serial 3000+ K2: AGC threshold setting

> Same problem with #3183, I was able to get 3.6vdc with a fluke meter.
>
> ----- Original Message -----
> From: "Wallace, Andy" <[email protected]>
> To: "'Elecraft'" <[email protected]>
> Sent: Wednesday, January 22, 2003 12:30 PM
> Subject: [Elecraft] Serial 3000+ K2: AGC threshold setting
>
>
> > Hi, Folks. Quick question to the K2 3000+ owners:
> > Did you have trouble setting the AGC threshold? This
> > was done with R1 on the Control Board, measuring at
> > U2 pin 5. Manual recommends 3.9V. I could only get
> > mine to 3.8V and that was with R1 fully counter-clockwise
> > as viewed facing the pot. Did so with RF gain fully
> > clockwise. 8A regulated line is 7.99V on my meter.
> > Leaving it at 3.8, I was able to do the S meter calibration
> > for zero and full-scale ok.
> >
> > Circuit is pretty simple -- RP6 is pretty much it! -- so
> > I am wondering what is up. I checked my work and all seems
> > OK, but will scrutinize more when I can get back to it.
> >
> > Andy
> > _______________________________________________
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> >
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