Hi Darrell: Your report is very similar to what I experienced.
>From an earlier email.... > Wayne suggested this too: > > "The simplest cure for this may be a different capacitor in the > oscillator that makes it too inefficient at reduced bias to even start. > > You might try 10 pF at C8 or 680 pF at C7 I installed a 10pf cap at C8 and it worked. I'm sure someone else did the same thing with success. Good luck. 73, Ken K3IU -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Darrell Bellerive Sent: Saturday, May 20, 2006 5:37 PM To: elecraft@mailman.qth.net Subject: [Elecraft] K2 AGC Off Problem Just finished alignment and test, part II of K2 #5093. All seems to be working as it should, except for the AGC off function. This problems appears to be the same as a few others have had, the cause of which was a bad 5.068 MHz crystal (X1). Perhaps I have the same problem. When the AGC is turned off the S-meter pegs at 40 over and the receiver is muted. The AGC threshold at pin 5 of U2 measures 3.8 volts whether AGC is on or off. The voltage at pin 1 of U2 goes from 3.8 volts with the AGC on to 5.4 volts with the AGC off. All components in the AGC circuit have been inspected again for correct values and placement. All solder joints have been reheated. I cannot measure the 5.068 MHz oscillator with my frequency counter (MFJ-259) at pin 6 or 7 of U1. Perhaps this counter loads down the circuit too much for it to oscillate? Listening with a portable shortwave receiver (5 kHz steps) finds a weak carrier at 5.070 that goes on and off with the power on the K2. Before I email Elecraft support, what else should I check? Darrell VA7TO _______________________________________________ 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
