Thanks for the response, but that's not the issue here.  K3s tuner in
bypass.

With tuner in bypass, and "TUNE" held down, SWR on K3s is 3.6.

Repeat with KAT500 in Manual mode, the SWR reading on K3s is 12.6:1 or
higher.

Repeat in AUTO Mode, and SWR goes to 99.9:1 because the KAT500 breaks
the signal path because it "sees" >10:1 and  ostensibly is faulting
though the Fault light does not come on.

73,

______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 8/8/2017 11:29 AM, Dick Dievendorff wrote:
> The ATU blinks the MODE LED when a tune has been started, but not enough RF
> is arriving from the exciter to proceed. It's waiting for about 20 watts
> from your exciter. If you want to cancel the tune, tap TUNE again.
>
> Don't use both the K3 internal ATU and the KAT500 ATU together.  One or the
> other should be bypassed.  
>
> 73 de Dick, K6KR
>
> -----Original Message-----
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Clay Autery
> Sent: Tuesday, August 8, 2017 09:02
> To: Elecraft Reflector <elecraft@mailman.qth.net>
> Subject: [Elecraft] KAT500 - Blinking Mode Light
>
> Situation:  Tuner inline between K3s and known good dummy load.
>
> 1) Tuner off - K3s tunes 1:1 instantly
> 2) Tuner on in bypass - K3s tunes 1:1 instantly
> 3) Tuner on, and in Manual OR Auto Mode, tuner clicks and then Mode light
> starts blinking.
>
> All components in signal path obviously AND tested known good.
>
> Any ideas where to start troubleshooting the malfunction?
>
> --
> ______________________
> Clay Autery, KY5G
>
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