I’m going to set it up in the damp basement at my other QTH. That’s where I saw the problem originally. Will let you know if it comes back.
> On Dec 7, 2020, at 11:43 AM, Don Wilhelm <[email protected]> wrote: > > Bill, > > It does sound like it is fixed. Just be aware that some intermittents do > find their way back, so knowing the symptoms you can recognize it quickly. > > 73, > Don W3FPR > > On 12/6/2020 6:30 PM, Bill Coleman wrote: >> Don, >> >> I set the K2 up this weekend to try to reproduce this problem. Once again I >> opened it up and re-installed the K60XV board. I put a scope probe on P1 pin >> 6. >> >> I did not see the AGC failure mode right away, but I did find an >> intermittent oscillation on pin 6 at about 15 MHz. It would come and go, but >> no AGC activation. >> >> I removed the board and re-soldered all the components around the LM358. >> Then I inspected the board and scraped away any residual solder flux in that >> area of the board between any pins. >> >> I also re-soldered the 4.0 MHz resonator, although I did not hear or detect >> any relay activation when it failed before. >> >> After that, I put the board back in with the scope probe and ran it on the >> workbench for a day. I saw no AGC failure mode and no more 15 MHz >> oscillation. >> >> So, maybe it is fixed? Fingers crossed. >> >> > Bill Coleman, AA4LR, PP-ASEL Mail: [email protected] Web: http://boringhamradiopart.blogspot.com Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
