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Low Power Out from 6400 - any suggestions?
Last weekend while operating from my van for a Parks on the Air activation, my 6400 output power suddenly dropped to a few tenths of a watt. Happened in mid-QSO. Radio was connected to three 98 AHr batteries that were fully charged. No difference whether transmitting into resonant antennas or dummy load. I rebooted; no change. Power button was solid green on receive; solid red on transmit. I was operating SSB when the problem stated, but same issue in either SSB or CW. I was not using the internal ATU. Radio had operated normally for a dozen or more QSOs before it failed. Luckily I had my trusty Elecraft K2 with me, so the outing wasn't a complete bust.
When I got home and brought the radio into my home station, it initially exhibited the same symptoms. After about 45 minutes, during which time I was looking at all the settings in SmartSDR, searching the forum for hints, and occasionally keying the radio into a dummy load, the power output suddenly increased to about 70W maximum. I had not made any changes to any radio settings before the power output changed. So now the radio "sort of" works, although not at rated output. I double-checked my station power supply; it is steady at 13.8V DC in both receive and transmit. I'm running SmartSDR v.2.7.6. Max power is set to 100W in the TX tab of the Radio set up.
Any ideas what would cause this type of behavior? I was planning to use the radio in my van for Winter Field Day, but without understanding what happened, I'm reluctant to use the rig for a contest.
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