Thanks for the ideas guys.
I've emailed support at Elecraft to see what their thoughts are. I did
some additional testing.
I connected K3-B to my KPA-500/KAT-500 combo and I'm finding that the
K3-B sees a 1.5:1 swr while driving the KPA-500. The SWR of the KPA and
KAT swr meters both measure near 1.0:1. All other bands show 1.0:1
while driving the amp. K3-A sees a 1.0:1 SWR on 40m while driving the
KPA-500.
Something is up with measuring SWR on 40m with K3-B, even after
calibrating the wattmeter.
Rich - N5ZC
On 7/19/2014 7:10 PM, Richard Thorne wrote:
I have a strange swr issue I'm trying to resolve.
I have two K3's for an SO2R setup, lets call them K3-A and K3-B. On 40
meters the swr that the K3 displays on K3-A indicates what is to be
expected 1.5:1 at 7.001 and 2.0:1 at 7.105, however on K3-B the K3
displays 1.0:1 at 7.001 and 2.7:1 at 7.105.
I'm using the same exact coax to connect to both rigs and I'm going
directly to ant port 1 on both rigs. Neither rig has the ATU in line
(K3-B doesn't even have an internal ATU). The antenna is a 2 element
40m yagi.
I've used an external Daiwa swr/power meter which agrees with rig
K3-A's swr when connected to either radio.
So it appears that the displayed swr on rig K3-B is giving an
incorrect reading.
Any ideas? Is it time to calibrate the wattmeter?
Thanks
Rich - N5ZC
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