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KX3 power on sequence

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Edward A. Dauer

KX3 power on sequence

I have had similar experiences. After a complete power down and later
power up, the KX3 does not know the KXPA100 amp is ready even after both
are powered on, which then requires entering the menu and returning the
right PA setting. Reminiscent of the pre-fix days when turning on a K3
before applying power to the KAT500 would freeze the K3.

Does anyone know if there is a preferred power-up or power-down sequence
for the KX3 / KPA100 / that would avoid having to do that reset? I think
this came up on the reflector once before but I don¹t recall . . .

On the other question, about the KX3 and the PX3, there is an option in
the PX3 that would bypass its power switch and have it come on as soon as
power is supplied, and a second option that does the same but leaves the
power switch operable so long as the power isn¹t removed. Requires moving
a jumper - p.22 of the Manual.

Ted, KN1CBR

>------------------------------
>
>Message: 7
>Date: Mon, 29 Feb 2016 23:03:44 -0500
>From: sancho <[hidden email]>
>To: [hidden email]
>Subject: Re: [Elecraft] Dead PX3?
>Message-ID: <[hidden email]>
>Content-Type: text/plain; charset=us-ascii
>
>I have experienced similar issues only after a complete power down (KX3,
>PX3, KXPA100, computer, AND power supply). Both the PX3 and the KXPA100
>act like they have a mind of their own. The system slowly rights
>itself... first KXPA100 comes on and cycles with the KX3, then the PX3
>just starts working rando. Once all three are up and talking to each
>other, the system is good until the next time I do a complete power down
>and disconnect the antennas.
>
>Before you ask, I have tried to reseat all cables, I have checked to make
>sure PA is enabled in menu, and I have pushed the power on switch on the
>PX3. I have also switched to different USB dongles (I have 3 Elecraft
>KXUSB units).
>
>My solution is not to completely shut the station down unless I have to
>because of lightning.
>
>Jack KD4IZ
>Sent from my iPad

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Don Wilhelm-4

Re: KX3 power on sequence

Ted,

I am not sure what you mean about a "complete power down". If that
involves turning off the power supply, then I cannot comment because my
power supply is turned on 24/7. I have never seen that situation. My
KX3 turns on the KXPA100, no intervention required.

Based on my experience, I would think that turning on the power supply
first, then powering the KXPA100 and lastly the KX3 might prevent the
problem. In other words, if the KXPA100 is not powered on first, the
KX3 will not recognize it when powered on, and may turn the PA Mode
parameter to OFF.

As I said, I never touch the KXPA100, it turns on/off with the power to
the KX3.

I have no answer on your PX3 question.

73,
Don W3FPR

On 3/1/2016 6:23 PM, Dauer, Edward wrote:

> I have had similar experiences. After a complete power down and later
> power up, the KX3 does not know the KXPA100 amp is ready even after both
> are powered on, which then requires entering the menu and returning the
> right PA setting. Reminiscent of the pre-fix days when turning on a K3
> before applying power to the KAT500 would freeze the K3.
>
> Does anyone know if there is a preferred power-up or power-down sequence
> for the KX3 / KPA100 / that would avoid having to do that reset? I think
> this came up on the reflector once before but I don¹t recall . . .
>
> On the other question, about the KX3 and the PX3, there is an option in
> the PX3 that would bypass its power switch and have it come on as soon as
> power is supplied, and a second option that does the same but leaves the
> power switch operable so long as the power isn¹t removed. Requires moving
> a jumper - p.22 of the Manual.
>
>

Bob N3MNT

Re: KX3 power on sequence

I too am a little confused as to "Complete power down". If you do not shut the KX3/KXPA100 down using the power off buttons ( band /autotune) but shut down the external power source, the KX3 senses that and switches to internal bat if installed. This switches the power out to below 10W which sets PA off. When the KX3 is finally shut down it remembers it's last state and comes up as PA off. I have both KX3 and KXPA100 on same supply. I turn on supply then then KX3 which after boot sequence turns on KXPA100. Not sure if this will help, but I have seen what you are experiencing when the power is accidentally shut down before shutting of KX3.

Bob N3MNT

Re: KX3 power on sequence

Hit send too soon.

See page 28 of PX3 manual there is an internal jumper that can be set to have PX3 power up when power supply is turned on.