[Elecraft] KX3/KXPA100 Power Output Difference

Jim Ruff w7jhr at yahoo.com
Fri Dec 1 21:33:03 EST 2017


I using a KX3/KXPA100 and I'm noticing that when I'm in TX the RF meter on the rig matches the set power of the rig, but on the KXP100 meter, it shows 10 or more watts less output.  Some examples:Rig   Amp50w  40w60w  50w70w  60w80w  70w
Here is what i've checked so far.  The Powerwerx PS is showing 13.8v when receiving and dips to 12.9v when in TX, so I don't believe I have a voltage problem.  I've moved the rig's power connection  back and forth from the front of the Powerwerx  PS to the top power pole connection on the back of the KXPA100 with no change.I've also re-tuned all bands from 10-40 meters with my LDG100 remote tuner and the highest SWR I receive is 1.4:1 on 30 and 40 meters.  All of the other bands are 1:1 to 1.2:1, so I don't think I'm getting any power foldback because of high SWR..  Does anyone have any thoughts on what's causing this differential, and if two power output meters are never going to be in sync, which meter is the most accurate?
Also, as an aside. Is there something wrong with the KX3 group from Yahoo? I haven't recieved a digest in days and when I try to get into the group I get an error message
Thanks,Jim W7JHR


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