[Elecraft] K3 SWR Question3

Ed G ed.n3cw at gmail.com
Sun Jan 20 12:17:21 EST 2019


Hello,
     My K3 is exhibiting some SWR meter behavior I don’t quite understand. To eliminate any possible effects of antennas or cabling, I hooked a Palstar DL2K dummy load directly to the K3 antenna connector. All bands except 40 meters seem fine, with SWR reading as you would expect with a dummy load. The anomaly I am seeing is that SWR as shown on the K3 meter looks fine at 7.01 MHz (approx. 1.2:1), but as I go up in frequency, the SWR as shown on the K3 meter rises. When I transmit into the dummy load on 7.298 MHz, the K3 meter reads almost 3:1.   I can switch in the K3 internal tuner and bring the SWR down to 1:1.  
     I also tried an older Cantenna dummy load with the same puzzling results.  Any ideas as to what may be causing this 40 meter only problem?  I first noticed this problem during NAQP SSB when using my Steppir, which of course retunes itself as I change frequency. When going from the low part of the phone band to the high part on 40 meters, I noticed SWR increasing on the K3 meter, even though it was not increasing and stayed at 1.2:1 on my inline LP-100A.  The K3 also started to fold back power.  That prompted me to do the further testing with the dummy load as I discussed above.
--Ed—


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