KPA500 - KAT500 stopping K3 boot

[w4sc-2]

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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[Mark Musick]

Ben,
You no longer have to worry about the KAT500 stopping the K3 power on. That was fixed in a 4.xx firmware update eons ago. If you have a 5.xx firmware version in your K3 you have nothing to worry about.
As far as I know there never was an issue with the KPA500. I never had any issues with my KPA500 and after loading the updated firmware no issue with my KAT500 either.

73,
Mark, WB9CIF

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of w4sc
Sent: Thursday, August 8, 2019 20:06
To: [hidden email]
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


Sent from Mail for Windows 10

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[Nr4c]

Turn the KAT500 ON. Amp can be OFF.

Sent from my iPhone
...nr4c. bill

> On Aug 8, 2019, at 4:05 PM, w4sc <[hidden email]> wrote:
>
> 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
>
>
> Sent from Mail for Windows 10
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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>
> This list hosted by: http://www.qsl.net
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[Elecraft mailing list]

Check your cables. It may be that you are using a straight-through cable with the power pins connected between the K3 and the KPA. These two pins (pin 8 on both sides) must not be connected.

73!
Jack, W6FB

> On Aug 8, 2019, at 1:05 PM, w4sc <[hidden email]> wrote:
>
> 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
>
>
> Sent from Mail for Windows 10
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
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[Dick Dievendorff-4]

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: [hidden email] <[hidden email]> On Behalf Of w4sc
Sent: Thursday, August 8, 2019 13:06
To: [hidden email]
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


Sent from Mail for Windows 10

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