David Howie wrote: > Some how I have managed to get the TPA set to 255C when the unit is first > switched on ie cold.I have reset it to ambient temperature using the CAL > function but do I need to repeat the calibration procedure adjusting the > bias control R6. No, you do not need to do the R6 adjustment again. Just do CAL TPA. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco