[Elecraft] K3/KPA500 VSWR on 6m

[wa9fvp]

Does anyone have this problem?

I was having problems on the low end of 6 meters.  VSWR was all over the
place!  The K3 would always measure a 1.2 :1, the KPA500 measured 1.5 to one
and the KAT500 wouldn't match my 6 meter beam.  I agree that there was a
problem with my Hygain 66DX6 but even on my Bird dummy load the SWR
measurements were off.  On Sunday, I re-tuned my 6 meter beam.  I was able
to match the antenna but the VSWR on the K3 was still all over the map.  

I remember when I was building the KPA500 that there was a 4" twisted wire
from the PA board to the RF out jack.  A short twisted wire as a
transmission line on the HF bands is probably OK but On 6 meters, the
inductance in twisted wire, I'm sure, will exhibit loss.  

I replace it the wire with a 4" length of RG58U.  Now all 3 SWR readings
agree and the VSWR is 1.1:1.

Jack WA9FVP



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Jack WA9FVP

Sent from my TRS-80 :-)
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