[Elecraft] K3 Internal Tuner Question

[Ron D'Eau Claire]

John, that is a common question.

The KAT3 is providing a 1:1 SWR between the KAT3 and the PA *inside* the K3
so the K3's PA is 'seeing' the correct load. The KAT3 cannot change the
impedance of the antenna presented to the ANT connector. 

You didn't say how much coax ran from the K3 to the Palstar. For an accurate
comparison it should be zero (use an adapter) or at most an couple of inches
of coax.

You can replace the antenna with a good dummy load, and they should read
much closer, although most dummy loads have some error as well, nor are SWR
meters precision instruments; they don't need to be for efficient
transmission line operation at H.F. 

Ron AC7AC


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of John Dziedziejko
Sent: 02 January 2012 04:13
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3 Internal Tuner Question

I installed the KAT3 over the weekend and the construction and calibration
was successful. This evening I hooked everything back up to check reception,
tuning and swr. I have it set to AUTO, when I tap the ATU TUNE switch the
tuner does its thing and I read a 1.0:1 swr on the K3 meter. I have a
Palstar Wattmeter installed between the K3 and the antenna and for some
reason I am getting a high swr on the Palstar meter of 5:1 and don't
understand why. I have a multiband vertical antenna with a 4:1 Unun at the
base of the antenna. Am I missing something here?

A little hand holding would be appreciated.

Regards,

John W9QP



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