[Elecraft] PA HOT

[Don Wilhelm]

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.
>
>