Bruce,
When I built and installed my KXB3080 modification I had high current on 80
meters...over 900 ma with a 12 volt supply. However in my case I had high
power on
80 meters...5 watts and around 4 watts on the other bands. To troubleshoot
this problem, I operated the kx1 out of the case for short transmit periods
with about an 8 volt supply. I had used a piece of insulation on the 2 close
wires on the LPF board and verified that this was not my problem. However
whenever I pried the LPF board slightly away from the main board (1mm??) the 80
meter current dropped to a normal value and power on all bands was OK. I never
identified the problem, but apparently something was shorting with the LPF
board snug against the main board. With the LPF board pried slightly away
there is no problem. I do not think it is a cold solder joint since I can now
tap the boards, wires, torroids, etc and nothing bad happens. Perhaps when
installing the LPF board against the main board a piece of tape or other
insulation between the boards would prevent a short. I now get between 3.0
watts and 4.1 watts on the 4 bands with my 13.7 volt supply (current about 600
ma) and about 1.5 watts with an 8.2 volt supply.
I also did the L3 modification and the power resistor modifications.
Possibly something is shorting on your LPF board.....or even the L3
modification. For sure I would not test with full voltage, but with a fused
power supply with something like 7 or 8 volts until you find the trouble.
PS...I had fun with my 5 watts on 80 meters for a few days until my
conservative nature kicked in and I fixed the "problem". No spectrum analyzer
here, so who knows what frequencie(s) my 5 watts was on !!!
Rick KL7CW Palmer Alaska KX1 # 798
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