[Elecraft] KPA500 - KAT500 stopping K3 boot

[Dick Dievendorff]

KAT500 sleeping (12v supply connected, power button "off") is fine.

The problem occurs when the KAT500 has no 12V power; it pulls down the AUXBUS pin. 

K3 MCU firmware was changed to display a reminder if the AUXBUS is held low for too long during startup.

>From K3 firmware release notes:

MCU 4.93 / DSP 2.83, 10-16-2014

* KAT500 POWER-ON REMINDER ON K3 DISPLAY: If a powered-off KAT500 is pulling the auxBus signal low when the K3 is first turned on, "TURN ON KAT500" is displayed. Previously this condition would lock up the K3 without explanation

73 de Dick, K6KR



-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of w4sc
Sent: Thursday, August 8, 2019 13:06
To: Elecraft at mailman.qth.net
Subject: [Elecraft] KPA500 - KAT500 stopping K3 boot

Is there an issue with the KPA500 being OFF with power up -> booting of the K3?  Does it need to be actually powered up, i.e. and in operational state?  OR is just having it in the “sleeping” state (REAR switch ON, FRONT PANEL SW-OFF) OK?

I know about KAT500 and AUX-BUSS stopping K3 bootup, and have an “automatic” solution that works great.

Ben W4SC


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