Why on earth would you turn the TX MON up all the way? My front door would be buzzing with it that loud.
Sent from my iPhone ...nr4c. bill > On Feb 16, 2016, at 10:14 PM, Jerry Moore <je...@carolinaheli.com> wrote: > > Hi, I thought I had the sound issue licked with the loose case screws but I > still hear the buzz. I believe I found the issue and it's NOT the speaker > (well I don't believe based on my findings). > > > > Hypothesis: > > I strongly suspect loose transformer cores are the cause of the buzzing that > are especially louder at different harmonics. > > > > Steps to reproduce and isolate the issue: > > 1. CW mode, Test (so no TX), Monitor all the way up (60? I think from > memory..Rig is disassembled atm..). > > 2. Send a string of code, you can hear the tones but a buzzing, listening > to received code results in the same buzzing distortion and appears > harmonic. > > 3. Disconnect all power/cables except ground. > > 4. Tap the covers, top, sides, front back, bottom, Found tapping the rear > bottom results in a perceptible rattle. > > 5. Remove bottom covers and inspect, no discernable cause, tapping board > results in a perceptible rattle. > > 6. Remove Fan assembly, PA-100 unit. Tapping results in perceptible > rattle. > > 7. Inspect KLPA3A board - There's a transformer core that's loose to the > board. > > 8. Tapping the KPA3A board results in a perceptible rattle. > > 9. Inspect the KPA3a board - it contains a transformer core that's loose > to the board. > > > > Conclusion: > > I believe that using a high temperature silicon or other adhesive approved > by Elecraft to secure the transformer cores to the circuit boards will > resolve the issue. > > > > Request: > > I'd like to have an Elecraft representative review my information and make a > determination as to its validity AND recommend an Elecraft acceptable > solution if they agree there's an issue. > > > > Thanks in advance. > > Jer > > > > Jerry Moore > > CDXA, INDEXA, SKCC, Fists > > AE4PB, K3S - S.N. 010324 > > http://www.qrz.com/db/AE4PB > > An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and > Patriotic. > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to n...@widomaker.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
