[Elecraft] Different SWRs on K3 and External Meter

[Jack Brindle]

John;

Where did you have the dummy load connected for the milliwatt calibration? As shown on
page 52 of the K3S manual, it should be connected to the XVTR OUT jack, NOT the
main antenna jack. 

Note that the milliwatt calibration is optional. If you aren’t planning on using a transverter,
there is no need to do it.

Jack, W6FB


> On Feb 5, 2018, at 8:59 PM, John Woodard <john.l.woodard at gmail.com> wrote:
> 
> On Sun, Feb 4, 2018 at 17:45 John Woodard <john.l.woodard at gmail.com> wrote:
> 
>> I just installed the KXV3B board, upgrading from the KXV3A. When I went to
>> do the 1mW calibration at the end, the calibration failed because the SWR
>> was 2.9:1 on 52 MHz. I tried a couple more times, with different dummy
>> loads and cables and found the same result.
>> 
>> 
>> I then connected an external SWR meter to the dummy load and found that
>> the external SWR meter showed a flat 1:1 SWR with the dummy load (as
>> expected) but the K3 SWR value was always higher, typically 1.4 or 1.5:1 up
>> to 2.9:1 on 52 MHz into the dummy load. The tuner works perfectly on all
>> bands, however.
>> 
>> 
>> Has anyone had a similar issue? I can’t quite tell if the problem is in
>> the KAT3 or on the K3 main board, and more importantly what the fix might
>> be.  Also, since the 1mW calibration failed, are there any other
>> workarounds? Many thanks in advance!
>> 
>> 
>> 73 de John, WK8A
>> 
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