Thanks Gary,
I redid the power calibration and the tuner tunes the dummy load all ok.
It still struggled with the 40 dipole (native swr, as measured by the
K3, is 1.6:1) and would only get a match of 1.4:1. But I put in a short
length of coax as you suggested and now it can find a 1.1:1 match,
although still with some struggle. No external switches, wattmeter etc.
Thanks,
Fred
From: Gary Surrency [mailto:[EMAIL PROTECTED]
Sent: Monday, September 29, 2008 2:43 PM
To: [EMAIL PROTECTED]
Subject: KE7X RE: [Elecraft] KAT3 Problem
Hi Fred,
Can you try a slightly different length of feedline to see if that helps
the tuner find a better match?
Just add or remove a length of coax if that is possible.
Be sure the screws in the KAT3 and ANT1, ANT2 connectors are all very
tight.
Try a different ground connection too, and the K3 is connected as
directly to the antenna as possible (no external antenna switches, SWR
or wattmeters, etc.).
Try lower power levels too (the tuner always uses 5w or less when it
operates).
Make sure the antenna and feedline has no bad connections, and use a SWR
analyzer to check its match if you have one such as the MFJ-259B.
If a powerful AM, FM, TV, or pager antenna is nearby, it might be
affecting the tuner's operation on the antenna.
--
73, Gary AB7MY
=
[EMAIL PROTECTED]
Elecraft Technical Support
Hi,
-Original Message-
From: Cady, Fred [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED]
Date: Monday, Sep 29, 2008 6:28 am
Subject: RE: [Elecraft] KAT3 Problem
To: [EMAIL PROTECTED] mailto:[EMAIL PROTECTED]
Thanks Tom. Been there done that and that's what it acts like
but the
ant selection is OK. I can bypass the atu and it sees the dummy
load
fine. Would there be any filters or anything that are used on 7
and 24
only?
Thanks,
Fred
-Original Message-
From: Tom Hammond [mailto:[EMAIL PROTECTED]
Sent: Monday, September 29, 2008 3:04 AM
To: Cady, Fred
Subject: Re: [Elecraft] KAT3 Problem
Fred:
Double check that you somehow didn't manage to get ANT2 set as
the
default antenna selection for those bands... if so, you're
probably
tuning into NO ANTENNA...!
73,
Tom N0SS
At 21:48 09/28/2008, you wrote:
Hi,
Just getting K3 going and KAT3 does not tune properly on
7 and 24 MHz.
I'm pretty sure it worked earlier today on a 40 m dipole
I put up but
now it doesn't tune the dipole or a dummy load. When
trying to tune the
dummy load and checking the L C I get Ca = Ct=0.66 nF
and L=0.75 uH
and 2.5:1 SWR. If I change Ca = 0.04 nF and L = 0.1 uH I
get 1.0:1 but
when hitting tune again the KAT3 goes back to the
previous 2.5:1
settings. All other bands except 24 MHz seem ok.
Any thoughts?
Thanks,
KE7X
Fred Cady
Fcady at ieee dot org
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