[Elecraft] K3 KAT3 strange behaviour

[Adrian]

On 12/05/2010 11:40 PM, elecraft-request at mailman.qth.net wrote:
> From: Gary Gregory<garyvk4fd at gmail.com>
> Subject: [Elecraft] K3 KAT3 strange behaviour
> To:elecraft at mailman.qth.net
> Message-ID:
> 	<AANLkTikt6d7NR2b_TDN=FY1ADzF0Vs7F9SA6NWtLYMyq at mail.gmail.com>
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>
> G'Day all.
>
> Just now, using a double extended zepp I find it tunes all bands except 20M
> consistently but for a couple of weeks it has been fine.
>
> The KAT3 will tune to 1.1:1 BUT the swr meter fluctuates to 3:1 but does*not
> * generate HI SWR on the display.
>
> All other bands this behavior does not occur.
>
> Press and hold tune at 5W and up to 100W the swr shows stable. Without the
> KAT3 the zepp is 1.4:1 and reads stable.
>
> SSB Tx however produces this fluctuating swr reading which reaches as high
> as 3:1
>
> Scratching my head here as all other bands 80 thru 10M this swr problem does
> not appear.
>
> It started during a qso and the other station reported a jump in signal
> strength from S2 to S9 on 20M
>
> Any clues from the group would be most helpful.
>
> 73's
> Gary
>
Gary, I noticed the fluctuating K3 swr meter behaviour when driving an 
amp here (no KAT3 in mine). Changing the length of coax seems to have 
quite an effect on settling it down.

If you can add 1/8 ~ 1/4 wl of coax in the length with a joiner, it 
would be interesting to see your results.

Adrian ... vk4tux