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K3 not transmitting anymore

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PD2R

K3 not transmitting anymore

Today I was playing with my K3 AGC settings to learn more about them. At
some point I had placed my Heil Pro Set Plus on top of the K3. A strong
signal presented itself resulting in a increased audio level from the K3’s
speaker. Unfortunately VOX was still on and the K3 started transmitting. I
quickly tried to disengage the VOX but mistakenly hit the power button.

When I turned the K3 back on it wouldn’t transmit anymore. Not with the mic
connected to the rear panel nor from the frond panel. Using VOX of XMIT
button makes no difference.
The only way the K3 will transmit is when I use the internal ATU. The
recorded messages from de DVR worked at first but turning the power off and
on once more resulted in the loss of the recorded messages and I am not able
to transmit new messages.

In TEST mode it is exactly the same, no audio from the mic.

I’m afraid I really “foecked oep” this time and that I will have to contact
Elecraft and do some repair work :-(

73, Maarten
PD2R
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Maarten, PD2R
Member of the PI4DX contest group
www.pi4dx.com

Elecraft K3 nr:1849

Dave, G4AON

Re: K3 not transmitting anymore

I had a similar "oops" with my K3, a faulty cable/adapter on the KEY
input socket caused my K3 to go to full CW carrier output on 6m, in a
hurry to stop the transmission, I turned the power supply mains off as
the K3's controls seemed to be locked... Big mistake, the uncontrolled
power down of the K3 while transmitting somehow seems to have put out RF
on the KXV3 RF IN/OUT line and damaged an external 6m pre-amp that was
in use at the time.

There are two issues here:

1. If a power supply fails the K3 doesn't seem to do an orderly shutdown
if it's transmitting at the time of power failure.

2. The KXV3 shouldn't be able to output TX RF power from the receive
external filter/pre-amp sockets.

I have repaired my 6m pre-amp (not the Elecraft PR6), but am wary of
using the K3 on 6m again, my TS480SAT doesn't need a pre-amp and will
continue to be my radio of choice for 6m.

73 Dave, G4AON
K3/100 #80
-----------------
Today I was playing with my K3 AGC settings to learn more about them. At
some point I had placed my Heil Pro Set Plus on top of the K3. A strong
signal presented itself resulting in a increased audio level from the K3’s
speaker. Unfortunately VOX was still on and the K3 started transmitting. I
quickly tried to disengage the VOX but mistakenly hit the power button.

When I turned the K3 back on it wouldn’t transmit anymore.
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PD2R

Re: K3 not transmitting anymore

Thank you Dave for your reply, but it was a entirely different "problem".

I'm embarrassed like you won't believe. Before posting my problem on the
reflector I thought I had checked everything to make sure that is was a
genuine problem. After an hour of doing something else, I turned the K3 back
on and went through all the knobs once more to find out that the MIC gain
was set to "0". I had been playing with the MIC gain earlier before and I
guess at some point turned the knob counter clockwise. Why? I do not have a
clue.

I'm glad though that my "problem" is fixed without having to repair
anything. Except for my ego that is...

Best 73,
A embarrassed person

2009/6/7 Dave, G4AON <[hidden email]>

> I had a similar "oops" with my K3, a faulty cable/adapter on the KEY input
> socket caused my K3 to go to full CW carrier output on 6m, in a hurry to
> stop the transmission, I turned the power supply mains off as the K3's
> controls seemed to be locked... Big mistake, the uncontrolled power down of
> the K3 while transmitting somehow seems to have put out RF on the KXV3 RF
> IN/OUT line and damaged an external 6m pre-amp that was in use at the time.
>
> There are two issues here:
>
> 1. If a power supply fails the K3 doesn't seem to do an orderly shutdown if
> it's transmitting at the time of power failure.
>
> 2. The KXV3 shouldn't be able to output TX RF power from the receive
> external filter/pre-amp sockets.
>
> I have repaired my 6m pre-amp (not the Elecraft PR6), but am wary of using
> the K3 on 6m again, my TS480SAT doesn't need a pre-amp and will continue to
> be my radio of choice for 6m.
>
> 73 Dave, G4AON
> K3/100 #80
> -----------------
>
> Today I was playing with my K3 AGC settings to learn more about them. At
> some point I had placed my Heil Pro Set Plus on top of the K3. A strong
> signal presented itself resulting in a increased audio level from the K3’s
> speaker. Unfortunately VOX was still on and the K3 started transmitting. I
> quickly tried to disengage the VOX but mistakenly hit the power button.
>
> When I turned the K3 back on it wouldn’t transmit anymore.
>

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Maarten, PD2R
Member of the PI4DX contest group
www.pi4dx.com

Elecraft K3 nr:1849

AC7AC

Re: K3 not transmitting anymore

CONTENTS DELETED

The author has deleted this message.

Sid K3SX

Re: K3 not transmitting anymore

This brings up the question of what is a good UPS for the K3 and usually
attendant computer?
I live in a rural area and I have the entire house on a 15 KW backup
generator but it requires 32 seconds to kick in. This morning we lost
power for 5 seconds and I was fortunate the "brains" didn't get scrambled.
Sid

Ron D'Eau Claire wrote:
> Glad to hear it was such an easy fix, Maarten! But you do bring up an issue
> that has appeared on the reflector before: the K3 *wants* an orderly
> shutdown sequence to avoid unusual and troublesome issues.
>

> It's easy to forget that radios like the K3 are more "computer" than "radio"
> - at least as many of us know "radios", Hi!
>
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MontyS

Re: K3 not transmitting anymore

Sid -

Any good computer UPS will keep the K3 running for 32 seconds. I wouldn't
transmit during that time, however, unless you allow for that in your UPS's
capacity. I recently bought a large-capacity APC unit for our plasma TV to
isolate it from the mains (Florida is lightning capital of the world) from
Amazon.com.

Monty K2DLJ

> This brings up the question of what is a good UPS for the K3 and usually
> attendant computer?
> I live in a rural area and I have the entire house on a 15 KW backup
> generator but it requires 32 seconds to kick in. This morning we lost
> power for 5 seconds and I was fortunate the "brains" didn't get scrambled.
> Sid
>

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Geoffrey Mackenzie-Kennedy

Re: K3 not transmitting anymore

In reply to this post by AC7AC

Ron D'Eau Claire wrote:

> An orderly shutdown requires the POWER button be pressed on the K3 before
> the power supply is shut down.

---------------------------------------------------

Ron,

Is there any interface available on the K3 which would allow an external
automatic protective shutdown system to meet this requirement, rather than
having to press the POWER button by hand?

73,
Geoff
GM4ESD

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AC7AC

Re: K3 not transmitting anymore

CONTENTS DELETED

The author has deleted this message.

Joe Planisky

Re: K3 not transmitting anymore

In reply to this post by Geoffrey Mackenzie-Kennedy

From the owners manual (page 44 in rev D2):

"Remote Power On/Off

A remote-control system can pull the POWER ON line to ground (ACC
connector, pg. 18) to turn the K3 ON. To turn it OFF, the controller
must send the K3 a "PS0;" remote-control command via the RS232
interface, then deactivate the POWER ON signal. This sequence ensures
that nonvolatile memory is updated correctly before shut-down."

Note that it doesn't say how long it takes to update the NVRAM after
the above process is completed. In other words, how soon after
deactivating the POWER ON signal can I shut down the 13.8V supply?

73
--
Joe KB8AP

On Jun 7, 2009, at 9:10 AM, Geoffrey Mackenzie-Kennedy wrote:

>
> Is there any interface available on the K3 which would allow an
> external
> automatic protective shutdown system to meet this requirement,
> rather than
> having to press the POWER button by hand?

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wayne burdick

Re: K3 not transmitting anymore

Administrator

Hi Joe,

Give it half a second (literally). In practice it should never take
more than 100-200 ms, but this will give you some margin.

I'll also note this in the Owner's Manual.

73,
Wayne
N6KR

On Jun 7, 2009, at 9:45 AM, Joe Planisky wrote:

> From the owners manual (page 44 in rev D2):
>
> "Remote Power On/Off
>
> A remote-control system can pull the POWER ON line to ground (ACC
> connector, pg. 18) to turn the K3 ON. To turn it OFF, the controller
> must send the K3 a "PS0;" remote-control command via the RS232
> interface, then deactivate the POWER ON signal. This sequence ensures
> that nonvolatile memory is updated correctly before shut-down."
>
> Note that it doesn't say how long it takes to update the NVRAM after
> the above process is completed. In other words, how soon after
> deactivating the POWER ON signal can I shut down the 13.8V supply?
>
> 73
> --
> Joe KB8AP

Geoffrey Mackenzie-Kennedy

Re: K3 not transmitting anymore

In reply to this post by Joe Planisky

Joe,

Many thanks for your help.

I had been toying with the idea of buying a K3 for use at another QTH, but
there the mains supply is not 100% reliable. If bad things can happen if the
13.8V supply shuts down as the result of a mains outage, that is serious.

73,
Geoff
GM4ESD

Joe Planisky wrote on Sunday, June 07, 2009 5:45 PM

> From the owners manual (page 44 in rev D2):
>
> "Remote Power On/Off
>
> A remote-control system can pull the POWER ON line to ground (ACC
> connector, pg. 18) to turn the K3 ON. To turn it OFF, the controller
> must send the K3 a "PS0;" remote-control command via the RS232 interface,
> then deactivate the POWER ON signal. This sequence ensures that
> nonvolatile memory is updated correctly before shut-down."
>
> Note that it doesn't say how long it takes to update the NVRAM after the
> above process is completed. In other words, how soon after deactivating
> the POWER ON signal can I shut down the 13.8V supply?
>
> 73
> --
> Joe KB8AP
>
>
> On Jun 7, 2009, at 9:10 AM, Geoffrey Mackenzie-Kennedy wrote:
>
>>
>> Is there any interface available on the K3 which would allow an external
>> automatic protective shutdown system to meet this requirement, rather
>> than
>> having to press the POWER button by hand?

wayne burdick

K3 power sequencing

Administrator

The preferred way to turn off the K3 is via the POWER switch. Or, from
a computer, by sending a "PS0" command, then waiting at least half a
second later dropping the /POWER_ON line.

You can turn the rig off at the power supply if that is unavoidable.
Just as with a "brownout," when the firmware senses a supply voltage
dip to 9.5 V or lower, it shuts down everything as cleanly as possible.
But it may not have time to update all changed parameters in EEPROM
(current VFO frequencies, etc.). Thus when you turn power back on, you
might find the VFO in the last location you were at when you switched
to the current band.

I once tried turning my K3 off with at power supply several dozen times
to see if I could make anything bad happen. Nothing did. That said, do
use the preferred method if you can.

73,
Wayne
N6KR

On Jun 7, 2009, at 11:03 AM, Geoffrey Mackenzie-Kennedy wrote:

> Joe,
>
> Many thanks for your help.
>
> I had been toying with the idea of buying a K3 for use at another QTH,
> but
> there the mains supply is not 100% reliable. If bad things can happen
> if the
> 13.8V supply shuts down as the result of a mains outage, that is
> serious.
>
> 73,
> Geoff
> GM4ESD
>
>
> Joe Planisky wrote on Sunday, June 07, 2009 5:45 PM
>
>> From the owners manual (page 44 in rev D2):
>>
>> "Remote Power On/Off
>>
>> A remote-control system can pull the POWER ON line to ground (ACC
>> connector, pg. 18) to turn the K3 ON. To turn it OFF, the controller
>> must send the K3 a "PS0;" remote-control command via the RS232
>> interface,
>> then deactivate the POWER ON signal. This sequence ensures that
>> nonvolatile memory is updated correctly before shut-down."
>>
>> Note that it doesn't say how long it takes to update the NVRAM after
>> the
>> above process is completed. In other words, how soon after
>> deactivating
>> the POWER ON signal can I shut down the 13.8V supply?
>>
>> 73
>> --
>> Joe KB8AP
>>
>>
>> On Jun 7, 2009, at 9:10 AM, Geoffrey Mackenzie-Kennedy wrote:
>>
>>>
>>> Is there any interface available on the K3 which would allow an
>>> external
>>> automatic protective shutdown system to meet this requirement,
>>> rather
>>> than
>>> having to press the POWER button by hand?
>
> ______________________________________________________________
> Elecraft mailing list
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> Help: http://mailman.qth.net/mmfaq.htm
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>
>

David Gilbert

Re: K3 not transmitting anymore

In reply to this post by Geoffrey Mackenzie-Kennedy

Personally, I don't see that as a major jeopardy. A UPS is fairly cheap
(certainly in comparison to a K3), kicks in within milliseconds, and
should easily give you enough time to do an orderly shutdown. Most
modern UPS's link to the computer via USB and will provide an orderly
shutdown to the computer, so it might even be possible for Windows to
execute some sort of script to send the PS0 command to the K3 before it
shuts the computer down.

In any case, I think the jeopardy for the K3 is not worse than what can
happen to your computer if it loses the AC mains during a system disk
write operation. The potential loss of valuable data and/or having to
reinstall the operating system is a total pain.

73,
Dave AB7E

Geoffrey Mackenzie-Kennedy wrote:

> Joe,
>
> Many thanks for your help.
>
> I had been toying with the idea of buying a K3 for use at another QTH, but
> there the mains supply is not 100% reliable. If bad things can happen if the
> 13.8V supply shuts down as the result of a mains outage, that is serious.
>
> 73,
> Geoff
> GM4ESD
>
>

AC7AC

Re: K3 not transmitting anymore

In reply to this post by Geoffrey Mackenzie-Kennedy

CONTENTS DELETED

The author has deleted this message.

Phil LaMarche-2

Re: K3 power sequencing

In reply to this post by wayne burdick

With the lightening in Florida, I have a very large UPS on all my equipment
and computers.

Phil

Philip LaMarche
LaMarche Enterprises, Inc.
www.instantgourmetspices.com

www.w9dvm.com
800-395-7795 pin 02
727-944-3226
FAX 727-937-8834
NASFT 30210

K3 #1605

CCA 98 00827
W9DVM

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of wayne burdick
Sent: Sunday, June 07, 2009 2:23 PM
To: Geoffrey Mackenzie-Kennedy
Cc: Elecraft Discussion List
Subject: [Elecraft] K3 power sequencing

The preferred way to turn off the K3 is via the POWER switch. Or, from a
computer, by sending a "PS0" command, then waiting at least half a second
later dropping the /POWER_ON line.

You can turn the rig off at the power supply if that is unavoidable.
Just as with a "brownout," when the firmware senses a supply voltage dip to
9.5 V or lower, it shuts down everything as cleanly as possible.
But it may not have time to update all changed parameters in EEPROM (current
VFO frequencies, etc.). Thus when you turn power back on, you might find the
VFO in the last location you were at when you switched to the current band.

I once tried turning my K3 off with at power supply several dozen times to
see if I could make anything bad happen. Nothing did. That said, do use the
preferred method if you can.

73,
Wayne
N6KR

On Jun 7, 2009, at 11:03 AM, Geoffrey Mackenzie-Kennedy wrote:

> Joe,
>
> Many thanks for your help.
>
> I had been toying with the idea of buying a K3 for use at another QTH,
> but there the mains supply is not 100% reliable. If bad things can
> happen if the 13.8V supply shuts down as the result of a mains outage,
> that is serious.
>
> 73,
> Geoff
> GM4ESD
>
>
> Joe Planisky wrote on Sunday, June 07, 2009 5:45 PM
>
>> From the owners manual (page 44 in rev D2):
>>
>> "Remote Power On/Off
>>
>> A remote-control system can pull the POWER ON line to ground (ACC
>> connector, pg. 18) to turn the K3 ON. To turn it OFF, the controller
>> must send the K3 a "PS0;" remote-control command via the RS232
>> interface, then deactivate the POWER ON signal. This sequence
>> ensures that nonvolatile memory is updated correctly before
>> shut-down."
>>
>> Note that it doesn't say how long it takes to update the NVRAM after
>> the above process is completed. In other words, how soon after
>> deactivating the POWER ON signal can I shut down the 13.8V supply?
>>
>> 73
>> --
>> Joe KB8AP
>>
>>
>> On Jun 7, 2009, at 9:10 AM, Geoffrey Mackenzie-Kennedy wrote:
>>
>>>
>>> Is there any interface available on the K3 which would allow an
>>> external automatic protective shutdown system to meet this
>>> requirement, rather than having to press the POWER button by hand?
>
> ______________________________________________________________
> 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
>
>

Ralph Tyrrell

Re: K3 not transmitting anymore

In reply to this post by PD2R

I am using an Alinco DM-330M power supply. Across the output of the power supply I have a 26 AH battery. If the AC power quits I have many hours to shut down the K3.

I have the output of the power supply set to 13.8 V. Should it be slightly higher? How much?

Sometimes I do not even turn on the power supply when I get on the air.
I keep looking for a power outage, less QRM, QRN.

73, Ty, W1TF (GA), K3 # 696

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Bill K9YEQ

Re: K3 power sequencing

In reply to this post by Phil LaMarche-2

I use a Power Gate PGS40 with a GSM battery backup, same as UPS but cheaper
in terms of how long one can stay on the air, so the issues of what happens
when one loses power, here are none existant. I experience quite frequent
blips so power backup is important.

73,

Bill
K9YEQ
K2 #35; KX1 #35; K3 #1744; mini mods
ATS-3B
-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Phil LaMarche
Sent: Sunday, June 07, 2009 1:58 PM
To: 'wayne burdick'; 'Geoffrey Mackenzie-Kennedy'
Cc: 'Elecraft Discussion List'
Subject: Re: [Elecraft] K3 power sequencing

With the lightening in Florida, I have a very large UPS on all my equipment
and computers.

Phil

Philip LaMarche
LaMarche Enterprises, Inc.
www.instantgourmetspices.com

www.w9dvm.com
800-395-7795 pin 02
727-944-3226
FAX 727-937-8834
NASFT 30210

K3 #1605

CCA 98 00827
W9DVM

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of wayne burdick
Sent: Sunday, June 07, 2009 2:23 PM
To: Geoffrey Mackenzie-Kennedy
Cc: Elecraft Discussion List
Subject: [Elecraft] K3 power sequencing

The preferred way to turn off the K3 is via the POWER switch. Or, from a
computer, by sending a "PS0" command, then waiting at least half a second
later dropping the /POWER_ON line.

You can turn the rig off at the power supply if that is unavoidable.
Just as with a "brownout," when the firmware senses a supply voltage dip to
9.5 V or lower, it shuts down everything as cleanly as possible.
But it may not have time to update all changed parameters in EEPROM (current
VFO frequencies, etc.). Thus when you turn power back on, you might find the
VFO in the last location you were at when you switched to the current band.

I once tried turning my K3 off with at power supply several dozen times to
see if I could make anything bad happen. Nothing did. That said, do use the
preferred method if you can.

73,
Wayne
N6KR

On Jun 7, 2009, at 11:03 AM, Geoffrey Mackenzie-Kennedy wrote:

---

http://www.elecraft.com

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myles landstein

Re: Battery K3 not transmitting anymore

In reply to this post by Ralph Tyrrell

Maybe someone smarter than I can address your battery requirement.

In order to calculate the required times for charging and
'floating' the battery we need to know a few parameters:

A) make/model of the battery, spec's vary from manufacture even
for similar types (agm/gell) etc.
B) Average temp of the battery room.
C) Often overlooked is the length and gauge of the wire to the
battery (do you have a fuse inline recommended but adds
resistance ?) as even a small amount of resistance will effect
change the volts/amps at the battery terminals you need to
compensate for this.
D) Once you have those parameters set you should be able to
calculate the charge rates, the float rates at a minimum.

Seems every one has a different opinion as to how best to charge/
float and other things I always like to start with the manufactures
spec sheets.

You might want to try a product like a superpower gate I have a
few and they work great as batteries are rather expensive and
not taking care of them properly will mean they either won't be
me fully ready for use , or worse have their life reduced.

or at least have a 4 stage 'charger' handy , if you happen to
have a Astron, there as some articles around the web as to how
to modify them to interface w/a battery.

What did I forget to mention?

Best of luck
Myles
N2EHG

On Jun 7, 2009, at 3:57 PM, Ralph Tyrrell wrote:

>
> I am using an Alinco DM-330M power supply. Across the output of the
> power supply I have a 26 AH battery. If the AC power quits I have
> many hours to shut down the K3.
>
> I have the output of the power supply set to 13.8 V. Should it be
> slightly higher? How much?
>
> Sometimes I do not even turn on the power supply when I get on the
> air.
> I keep looking for a power outage, less QRM, QRN.
>
> 73, Ty, W1TF (GA), K3 # 696
>
>
>
>
> ______________________________________________________________
> 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

Myles Landstein
[hidden email]
please note my new email address
dti will soon be eliminated , gmail is my new home update your dir

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N5GE

Re: K3 power sequencing

In reply to this post by Bill K9YEQ

On Sun, 7 Jun 2009 16:45:31 -0500, "Bill K9YEQ" <[hidden email]>
wrote:

I use a Power Gate and three large commercial backup batteries of the
type used in server rooms. The Power Gate keeps them trickle charged.

Tom, N5GE
K3 #806, K3 #1055
XV144, XV432, KRC2
W1 and other small kits.
http://www.n5ge.com

>I use a Power Gate PGS40 with a GSM battery backup, same as UPS but cheaper
>in terms of how long one can stay on the air, so the issues of what happens
>when one loses power, here are none existant. I experience quite frequent
>blips so power backup is important.
>
>
>73,
>
>Bill
>K9YEQ
>K2 #35; KX1 #35; K3 #1744; mini mods
>ATS-3B
>-----Original Message-----
>From: [hidden email]
>[mailto:[hidden email]] On Behalf Of Phil LaMarche
>Sent: Sunday, June 07, 2009 1:58 PM
>To: 'wayne burdick'; 'Geoffrey Mackenzie-Kennedy'
>Cc: 'Elecraft Discussion List'
>Subject: Re: [Elecraft] K3 power sequencing
>
>
>With the lightening in Florida, I have a very large UPS on all my equipment
>and computers.
>
>Phil
>
>
>Philip LaMarche
>LaMarche Enterprises, Inc.
>www.instantgourmetspices.com
>
>www.w9dvm.com
>800-395-7795 pin 02
>727-944-3226
>FAX 727-937-8834
>NASFT 30210
>
>K3 #1605
>
>CCA 98 00827
>W9DVM
>
>
>
>-----Original Message-----
>From: [hidden email]
>[mailto:[hidden email]] On Behalf Of wayne burdick
>Sent: Sunday, June 07, 2009 2:23 PM
>To: Geoffrey Mackenzie-Kennedy
>Cc: Elecraft Discussion List
>Subject: [Elecraft] K3 power sequencing
>
>The preferred way to turn off the K3 is via the POWER switch. Or, from a
>computer, by sending a "PS0" command, then waiting at least half a second
>later dropping the /POWER_ON line.
>
>You can turn the rig off at the power supply if that is unavoidable.
>Just as with a "brownout," when the firmware senses a supply voltage dip to
>9.5 V or lower, it shuts down everything as cleanly as possible.
>But it may not have time to update all changed parameters in EEPROM (current
>VFO frequencies, etc.). Thus when you turn power back on, you might find the
>VFO in the last location you were at when you switched to the current band.
>
>I once tried turning my K3 off with at power supply several dozen times to
>see if I could make anything bad happen. Nothing did. That said, do use the
>preferred method if you can.
>
>73,
>Wayne
>N6KR
>
>On Jun 7, 2009, at 11:03 AM, Geoffrey Mackenzie-Kennedy wrote:
>
>> Joe,
>>
>> Many thanks for your help.
>>
>> I had been toying with the idea of buying a K3 for use at another QTH,
>> but there the mains supply is not 100% reliable. If bad things can
>> happen if the 13.8V supply shuts down as the result of a mains outage,
>> that is serious.
>>
>> 73,
>> Geoff
>> GM4ESD
>>
>>
>> Joe Planisky wrote on Sunday, June 07, 2009 5:45 PM
>>
>>> From the owners manual (page 44 in rev D2):
>>>
>>> "Remote Power On/Off
>>>
>>> A remote-control system can pull the POWER ON line to ground (ACC
>>> connector, pg. 18) to turn the K3 ON. To turn it OFF, the controller
>>> must send the K3 a "PS0;" remote-control command via the RS232
>>> interface, then deactivate the POWER ON signal. This sequence
>>> ensures that nonvolatile memory is updated correctly before
>>> shut-down."
>>>
>>> Note that it doesn't say how long it takes to update the NVRAM after
>>> the above process is completed. In other words, how soon after
>>> deactivating the POWER ON signal can I shut down the 13.8V supply?
>>>
>>> 73
>>> --
>>> Joe KB8AP
>>>
>>>
>>> On Jun 7, 2009, at 9:10 AM, Geoffrey Mackenzie-Kennedy wrote:
>>>
>>>>
>>>> Is there any interface available on the K3 which would allow an
>>>> external automatic protective shutdown system to meet this
>>>> requirement, rather than having to press the POWER button by hand?
>>
>> ______________________________________________________________
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>>
>
>---
>
>http://www.elecraft.com
>
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Amateur Radio Operator N5GE