[Elecraft] K3/100 TX problem on 20m

[Paul Kent]

Thanks again, Mike.
My K3 has the bipolar 100w PA.

I also have a properly-functioning K3S/100 with the CMOS PA. Just for 
comparison I ran the HP TX gain calibration on the K3S and it produced these 
numbers:

160m/19
80m/08
60m/10
40m/12
30m/13
20m/08
17m/08
15m/05
12m/10
10m/10
6m/06

The numbers are significantly different from those of the K3 but that probably 
doesn’t mean much. I even thought about swapping the PA modules between the K3 
and K3S as a test but they are not compatible for a direct swap.

Paul, K0PK

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[Elecraft] K3/100 TX problem on 20m

[Paul Kent]

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Thanks, Mike.

The 50w TX gain numbers are: 160m/32, 80m/36, 60m/48, 40m/40, 30m/32, 20m/18, 
17m/11, 15m/08, 12m/05, 10m/05, 6m/02

Paul, K0PK
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[Elecraft] K3/100 TX problem on 20m

[Paul Kent]

My K3/100 gives a high DC current warning when transmitting on 20m with power 
settings above 75 watts. Maximum output is about 80 watts and is unstable. All 
other bands perform normally with full 100w output and normal current draw. (50 
ohm dummy load) I have done the TX gain and wattmeter calibrations, finding no 
issues and with no change in symptoms. The output LPF is shared with 30m and I 
replaced all the capacitors in that circuit, also with no change in symptoms. 
Any ideas on what may be causing this problem?
Paul, K0PK
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