Don, Thanks for the fast reply. I did have the FR gain fully CW during the test. Anyway, I just checked (for the third time) the solder joints on the control board. Pin 4 on RP6 may have had a cold joint. I touched it up, and will re-assemble and recheck the votltage.
73 Mike, W8EMG ----- Original Message ----- From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]> To: "Mike, W8ENG" <[EMAIL PROTECTED]>; <elecraft@mailman.qth.net> Sent: Monday, November 15, 2004 7:34 PM Subject: Re: [Elecraft] Low voltage on AGC threshold > Mike, > > Since your adjustment range is on the 'edge of the cliff', it would be a > good idea to identify what is causing it before it bites you later on. > Check all the components for proper values and check solder connections very > carefully to determine why you are running out of adjustment range. Look at > the schematic to determine which components are connected to the AGC > threshold pot circuits and check them all with a careful eye, then check > again and when you have finished, check it once more - these things are > difficult to spot even with careful inspection (I know, I've been there, > done that many many times). > > 3.78 volts may be fine for the AGC Threshold adjustment - I often (usually) > find that the proper AGC threshold is between 3.6 and 3.8 volts. > > Just as an afterthought - you do have the RF gain control full clockwise do > you not? It will alter the reading on the AGC threshold measurement point. > > 73, > Don W3FPR > > ----- Original Message ----- > > When setting the AGC threshold I was not able to get 3.8 volts on pin 5 of > U2 as described in the manual. The voltage varied from 2.60 to 3.78 when > adjusting R1 to the extreme settings. Is this close enough or should I have > more room for adjustment? > > I have a faily good DMM, and it compares very closely to the K2 internal > meter, and when checking values on 1% tolerance resisters. All other checks > to date have been fine. > > > > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
