Ed,
The most common reason for CAL TPA going to 255 is that the K2 was
powered on when the heatsink temperature was below 0 degC. Since the
DAC values do not go negative, in the 8 bit world, the next number lower
than zero is 255.
73,
Don W3FPR
On 11/6/2014 4:14 PM, Eddy via Elecraft wrote:
I've seen this error before. My K2 (S/N 3500+ with latest firmware updates) had
been off, no 12vdc to rig for about 2 months. When I applied DC to the rig and
ATU and tried running the auto-tuner I got PA HOT error on the display, this
after about 1 minute of warm up!
So, went to the KPA100 manual to check tPA calibration, I discovered it was set
two 255 celius, a bit warm for my shack....LOL. Using the Fahrenheit to Celsius
formula in the manual, tPA should have read 18 Celsius. So, I adjusted the
KPA100 to room temperature and KPA100 has been working FB now.
So, any suggestions why tPA would lose its calibration? By-the-way, CAL CUR is
set to 3.5 amps per the manaul.
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