P3 Failure and such

[Bob McGraw - K4TAX]

I’ve always found and was taught that one should not just dump the power on station shut-down. This could be the cause of many mysterious and lucid operation

 Likewise; on power up:
(A). Power supply on first
(B). Transceiver on next
(C). P3 on if not powered from the K3
(D). KAT500 on if not powered from the K3

Shutdown the items in reverse order. NEVER just dump the power as there is a Power Down Imminent (PDI) circuit which saves data and then correctly shuts down the systems.

73
Bob, K4TAX

Sent from my iPhone

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[NK7Z]

In my case, I use the K3 power switch to shut down the station rig and
P3.  Thanks!

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 4/12/21 11:55 AM, Bob McGraw K4TAX wrote:

> I’ve always found and was taught that one should not just dump the power on station shut-down. This could be the cause of many mysterious and lucid operation
>
>   Likewise; on power up:
> (A). Power supply on first
> (B). Transceiver on next
> (C). P3 on if not powered from the K3
> (D). KAT500 on if not powered from the K3
>
> Shutdown the items in reverse order. NEVER just dump the power as there is a Power Down Imminent (PDI) circuit which saves data and then correctly shuts down the systems.
>
> 73
> Bob, K4TAX
>
> Sent from my iPhone
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>

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[Jim Brown-10]

On 4/12/2021 12:19 PM, Dave Cole wrote:
> In my case, I use the K3 power switch to shut down the station rig and P3.

That's I do, sort of -- I use my #1 K3's 12V accessory output to drive a
relay that turns off everything in my station except the other radio.
The K3s are fed with short, fat copper from a 100Ah LiFePO4 battery;
everything else runs from a 100Ah SLA battery. That SLA's load includes
antenna switching, P3/SVGAs, three video monitors, two LP100A power
monitors, and LED strips that are task-lighting for the operating position.

Batteries are float charged using re-purposed Thinkpad power supplies
with Genasun solar charge regulators.

73, Jim K9YC
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