Elecraft

RE: KE7X RE: KAT3 Problem

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Cady, Fred

RE: KE7X RE: KAT3 Problem

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:[hidden email]]
Sent: Monday, September 29, 2008 2:43 PM
To: [hidden email]
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
=========
[hidden email]
Elecraft Technical Support

Hi,

-----Original Message-----
From: "Cady, Fred" [hidden email]
Date: Monday, Sep 29, 2008 6:28 am
Subject: RE: [Elecraft] KAT3 Problem
To: [hidden email]

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 [[hidden email]] 
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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Cranz Nichols

RE: KE7X RE: KAT3 Problem

Fred:

"native swr, as measured by the K3, is..."

How did you get the K3 to measure the native SWR numerically?

That is exactly what I need to do - on another project.

cln
WB5BKL

----- Original Message ----- > ------------------------------

>
> Message: 7
> Date: Tue, 30 Sep 2008 06:26:32 -0600
> From: "Cady, Fred" <[hidden email]>
> Subject: RE: KE7X RE: [Elecraft] KAT3 Problem
> To: "Gary Surrency" <[hidden email]>
> Cc: [hidden email]
> Message-ID:
> <[hidden email]>
> Content-Type: text/plain; charset="us-ascii"
>
> 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)

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Ken Wagner K3IU

Re: KE7X RE: KAT3 Problem

Put the KAT3 in BYPASS mode, press and hold TUNE (not ATU TUNE), read display.
73,
Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Cranz Nichols wrote:

Fred:

"native swr, as measured by the K3, is..."

How did you get the K3 to measure the native SWR numerically?

That is exactly what I need to do - on another project.

cln
WB5BKL

----- Original Message ----- > ------------------------------

Message: 7
Date: Tue, 30 Sep 2008 06:26:32 -0600
From: "Cady, Fred" [hidden email]
Subject: RE: KE7X RE: [Elecraft] KAT3 Problem
To: "Gary Surrency" [hidden email]
Cc: [hidden email]
Message-ID:
[hidden email]
Content-Type: text/plain; charset="us-ascii"

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)

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