Hi Paul, For comparison, here are the 50 watt TX gain values from the calibration I did last November when I installed the KPA3A 100 watt PA in my K3 (s/n 67xx):
1900 kHz TXGain HP 10 3750 kHz TXGain HP 06 5336 kHz TXGain HP 08 7150 kHz TXGain HP 08 10125 kHz TXGain HP 08 14200 kHz TXGain HP 05 18110 kHz TXGain HP 05 21200 kHz TXGain HP 03 24930 kHz TXGain HP 03 29000 kHz TXGain HP 05 52000 kHz TXGain HP 04 Do you know if your 100 watt PA module uses RF bipolar transistors or MOSFETs (the KPA3A uses MOSFETs; the original KPA3 uses bipolars)? I don't know if the MOSFET version has higher gain than the bipolars, but I suspect not. I've been in a separate conversation with Hal, W7YNC, who is an LDMOS RF amplifier designer professionally. There is some uncertainty about whether the higher TX gain parameters mean higher TX drive signal amplitude or the converse. In any event, your TX gain values don't have wild swings from band to band, although the difference between 20 meter and 30 meter gains is substantial. Perhaps some others who have done TX gain calibrations recently (or could repeat them) on K3 units with the bipolar PA transistors could post their results? 73, Mike, K8CN ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
