[Elecraft] New KX3 field-test firmware provides more accurate KXPA100 power setting

[Wayne Burdick]

Hi all,

The KX3’s PWR control can be used to directly set the KXPA100’s power output, assuming the KX3 and amp are connected by a control cable, and PA MODE = ON. However, the PWR setting is an estimate based on factory calibration at 75 W; actual output varies with load impedance, supply voltage, and per-band amplifier gain. The estimate is typically within +/- 1 dB, adequate for most purposes.

The latest field-test firmware for the KX3 allows the operator to obtain more accurate amplifier output, if desired, using the KX3's TUNE function. After activating TUNE, power will be automatically adjusted to within about +/- 2 watts based on data read from the amplifier itself. This would typically be done after setting PWR or changing bands, and perhaps after switching antennas. 

If you're interested in testing the new firmware, please email me directly. (If you don't get an email back, it's because I've gotten too many volunteers.)

Thanks,

Wayne
N6KR