[Elecraft] Arc Fault Detector Woes

[Val]

Gentelmen,


Read the details and not the message subject only. It is not a matter of a
faulty detector and a HF caused false AFCI trip. There is no way 100W RF to
trip a detector that is OK at 500W. Tom guessed it right, it should be the
KPA3-100. As the issue is on 80M only (maybe on 160M too?) and the other
bands are OK, the DC circuits (as the power supply connector) can be ruled
out. 


It could be a faulty choke or a capacitor causing a LF parasitic
oscillations. Actually the arc fault detector is watching for LF waves that
every arc use to emit. Remember where the radio started from.


73, Val LZ1VB


----- Цитат от Tom Doligalski via Elecraft
(elecraft at mailman.qth.net), на 04.01.2021 в 19:57 -----  Over the last
several weeks I’ve been having problems with the arc fault detector
(AFCI) in my fusebox.This does not control the power to the shack, but to
our garage door operners.


It seemed random at first, but I think I’ve tracked it down a bit.


Running an Elecraft K3/KPA500/KAT500 combo. The AFCI ONLY trips when on 80
CW, running 100 watts (the KPA500 in standby bode). If the KPA500 is ON
(running 500 watts) there is no problem.


Seems fine on other bands….


80M antenna is a Carolina Windom. The usual baluns/line isolator/grounding
stuff.


Any ides?


Kinda worried that there is an issue with the 100 W amp in the K3.


73. 


Tom W4KX
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