[Elecraft] K3S/100 - TX current on 20m

[aj4tf]

Something that I have recently noticed on my K3S/100 :  DC current draw on 20
meters is significantly higher (+4 amps) than the other HF bands at the same
power setting and input conditions into a dummy load (into antenna, same
thing).   This is both before and after performing a TX Gain Cal.  

Test conditions:  mode Data A,  input single test tone from FLDIGI software
(4-5 bars ALC), tone level & frequency not changed during the tests, ATU
bypassed, ANT1 selected.  Power supply voltage in RX,  14.3 V,  RX current
1.2 - 1.3 amps.  

This ONLY occurs on 20m, the other HF bands seem to be OK. (6m is higher
than the HF bands by about 2 amps, not sure if that is normal or not).   For
example, with 80W out: 80m, 60m, 40m, 30m, 17m, 15m, 12m, 10m are all close
to 16 amps, but 20m is 20 amps.  (6m is 18 amps).

I searched the archive and found a few references to "bad low pass filter".  
I have already emailed details to support at elecraft.com but wondered if there
is something I can check in the meantime until they get back to me.

73 David AJ4TF



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