Thanks, Don, I’ll check it out when I have a chance next week. I appreciate your suggestions. At the moment, the K60XV and the K2 are about 35 miles apart….
> On Nov 28, 2020, at 5:53 PM, Don Wilhelm <[email protected]> wrote: > > Bill, > > You might want to inspect the K60XV soldering carefully for bridges and > anything unsoldered. > > When this fault condition occurs, what is the voltage on K60XV P1 pin 6. If > VRFDET becomes active during receive, the K2 may behave as you describe > because the firmware 'thinks' the K2 is transmitting. The fact that you do > not see it on the transverter bands further amplifies my thoughts on the > source of the problem being the VRFDET signal. > > I cannot think of a component problem that would create your condition, so > that is why I asked you to review the soldering. Look at the component > placement too - make sure all the components are in the right hole and not in > a nearby via hole. Check D3 and D4 for proper orientation. > > 73, > Don W3FPR > > On 11/28/2020 5:21 PM, Bill Coleman wrote: >> A few weeks ago, I managed to cobble enough of the parts together to build a >> K60XV. It came together great, and works both on 60m as well as a base for a >> transverter. >> I thought that would have been the happy end of the story, except I’ve had >> some odd trouble with it installed. I saw this briefly the day after the SS >> CW contest, and on the second day of the SS Phone contest. In each case, >> removing the K60XV solved the problem and it did not recur. >> Here’s what I’ve observed. After leaving the K2/100 turned on for several >> hours, the rig is in receive mode, but the AGC is fully activated, with all >> ten bars showing on the S-meter. The receiver audio is entirely blanked. >> This condition is intermittent and random. It tends to last for several >> seconds to many minutes. It happens on all bands at the same time EXCEPT it >> does NOT happen on any TRN band that is configured (I have one configured >> for 50 MHz/28 MHz). This lead me to believe the K60XV was involved. During >> the SS Phone, I removed the K60XV and replaced it with a Re-work eliminator >> and K2/100 and the rig worked just fine for the next 10 hours. >> During the last three days, I opened the K2 up and laid the KPA100 on the >> workbench and left the K2 powered up with the K60XV installed. The problem >> manifested itself within hours. I was able to run a few diagnostics. >> The AGC activation happens in all all AGC modes, SLO, FAST and OFF. I was >> able to get a scope probe on the emitter of Q12 on the Control board. When >> the blanking occurs, I see a train of pulses around 2 mS apart - around 500 >> Hz. 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]
