Jack,
Understood……
After reading your first reply I just went ahead and ran a line to my 12vdc
shack bus. It’s just a shame they don’t include a 12v output from the KPA500 to
run their companion tuner.
Your comments are appreciated.
73
Tom
W4TMW
> On Dec 18, 2014, at 3:55 PM, elecraft-requ...@mailman.qth.net wrote:
>
> Let me rephrase my answer. There is no 12V output form the KPA500. The
> internal 12V regulator is pretty well loaded, taking most of the capacity of
> the regulator. The KAT500 needs upwards of 1 amp when the relays are
> switching, and there is not enough capacity in the KPA?s regulator to handle
> that and maintain its own circuits (some of which are critical to the KPA?s
> operation).
>
> So, no, power to run the KAT500 really cannot be derived from the KPA500.
> Current K3?s _do_ have capacity on their 12V output, and older ones can be
> upgraded to handle the current. Or, you can go the route I traveled - build a
> small relay-switched power distribution box. I use the 12V output form the K3
> to power the relay, which simply switches my main 12V shack supply to the
> peripherals needed when the K3 is on. In my case this includes a W2, KRC2 and
> KPA500 among other devices.
>
> Hope this helps.
>
> 73!
>
> Jack B, W6FB
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