[Elecraft] [KAT500] Tuning

[Eric Swartz WA6HHQ - Elecraft]

The KAT500 will only initiate a tune based on SWR being above a threshold when it is in auto mode. Its manual mode requires a press of the tune button on the ATU first, followed by RF from the K3, for it to tune.

73,

Eric
www.elecraft.com
_..._

On Dec 8, 2012, at 6:32 PM, iain macdonnell - N6ML <ar at dseven.org> wrote:

> On Sat, Dec 8, 2012 at 6:07 PM, John Reilly <reillyjf at comcast.net> wrote:
>> I don't think I understand how the tuning works with the KAT500. I have a
>> K3, KPA500, and the two 15-pin cables (K3 to KAT, and KAT to KPA).
>> 
>> I set my K3 Tune Power to 25w. I thought when I press tune on the K3, the
>> KAT500 should tune, and it shouldn't key the Amp; however, when I do this, I
>> continue to get around 500w from the Amp.
>> 
>> Could someone please explain how this is supposed to work?
> 
> When you invoke the K3's TUNE function (hold the XMIT button), the K3
> will make a 25W key-down signal. Nothing more fancy than that happens
> at the K3.
> 
> If the KAT500 detects VSWR higher than the configured auto-tune
> threshold, it will inhibit keying to the amp, and attempt to tune
> (from memory first, then a full search if no suitable memory is
> available). If the KAT500 does not detect VSWR higher than the
> threshold, it will not inhibit keying, nor attempt any tune function.
> 
> Are you seeing high VSWR when you invoke the K3's TUNE function?
> 
> 73,
>    ~iain / N6ML