Re: [Elecraft_K3] change the processor board?
If your K3 is an older one that doesn’t have gold pins for the front panel, it might be oxidation on some of the pins. It might not be, of course, but it may be worth checking by removing the front panel, cleaning the pins and putting it back, maybe even with a little Deoxit or Contralube on them. I’ve not had exactly the same faults with my senior K3 (#266) but twice over its 8+ yr life have had esoteric happenings relating to frequency, power or error messages that were cured by doing this.
GL es 73
Sent: 21 August, 2016 5:50 PM
Subject: [Elecraft_K3] change the processor board?
My K3 now has two distinct bugs. One bug that's been present for
several months occurs during the first few minutes of warm-up (until the
indicated FacePlate FP temperature is above about 27C), when I turn the VFO
control the relays click and the freq jumps to an arbitrary and non-standard
value such as 246.200 MHz. Yes, I wrote two hundred and forty six point
two Megahertz. The second bug is more recent and highly frustrating.
Only on 75/80 meter band does this occur. After about one minute of
transmission the output power will drop back from 100 W down to about 35 W (CW
output for example or simply pressing XMIT to send a constant carrier) .
The only way to clear this condition is by turning off the rig and turning it
back on. This is when running into a known good 50 Ohm dummy load.
It's not heat related, it's not the SWR foldback function kicking in.
Nothing like that. It appears to be a "control related bug'. When it
is limited to about 35 W out (Bird Wattmeter), adjusting the power out control
indicates "100 W" but it's outputting about 35 Watts. All other bands do
not do this while the rig is confirmed in this trouble condition on 75/80
meters. In other words when the power is limited to about 35 W out on
75/80 meters I confirmed a proper 100 W out on all other bands. Very
strange to be limited to the one band.