[Elecraft] K3/KPA500/KAT500 revs 4.83/1.38/1.58

[Cady, Fred]

Here is how to make it fail:
Disconnect the power completely from the KAT500 (maybe the micro in it stays on when it is "powered" off).
Turn off the K3 with its power switch with the KPA turned on.
Turn on the K3 with the KPA500 on.
I get either a blank K3 LCD display or it is hung up.

To recover:
Turn the power supply to the k3 off.
Plug in the power cable to the KAT500 (I use the same supply as the K3 with a Rig runner that powers everything up at once when the K3 turns on).
Turn the K3 and KAT500 power supply on.
Hit the Power On button on the K3.

YMMV.

73 all,
Fred KE7X

"The Elecraft K3: Design, Configuration and Operation 2nd ed"
"The Elecraft KX3 - Going for the summit"
www.ke7x.com or www.lulu.com 
(Coming soon: "The Elecraft KPA500 and KAT500 - the K-Line Dream Station")

-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Arie Kleingeld PA3A
Sent: Saturday, February 22, 2014 3:51 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3/KPA500/KAT500 revs 4.83/1.38/1.58

Yes,
The KAT500 needed to be powered first. I also used to do that. That was in the 'older firmware times'.

With the current FW, up till now  I never bumped into any issue no matter which device was turned on first.

Arie PA3A


Jack Brindle schreef op 21-2-2014 20:34:
> The KAT500 needs to be powered on whenever the K3 is on in order to avoid loading the Auxbus. It can be powered up at the same time, but must be on before the K3 completes its initialization.
>
> The KPA500 has no restriction, and can be powered on any time before or after the K3 is turned on.
>
> Jack Brindle, W6FB
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