Bewildering K3/KPA500 power cycling.

[Wes Stewart-2]

This has bothered me since I got my KPA500 but it hasn't been a show stopper so
I haven't brought it up before.

It's actually somewhat difficult to describe since it makes no real sense, but I
will try.

If both the K3 and the KPA are off (KPA rear breaker is on) and I power up the
K3, the KPA powers up.  If I power off the K3, the KPA stays powered.  If I
power on the K3 the KPA then powers off and the front panel button is inactive.  
If I want the KPA power on, I have to cycle the rear panel breaker or power
cycle the K3. This is nuts, but my question is, is it "normal"?

Wes  N7WS.

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[Jack Brindle-2]

Nope. You need to check the aux io cable. I would bet the power-on pin is connected on both sides. It should not be. Fix that and the KPA should behave normally.

Jack, W6FB

Sent from my iPhone

> On Jul 6, 2016, at 12:02 PM, Wes Stewart <[hidden email]> wrote:
>
> This has bothered me since I got my KPA500 but it hasn't been a show stopper so I haven't brought it up before.
>
> It's actually somewhat difficult to describe since it makes no real sense, but I will try.
>
> If both the K3 and the KPA are off (KPA rear breaker is on) and I power up the K3, the KPA powers up.  If I power off the K3, the KPA stays powered.  If I power on the K3 the KPA then powers off and the front panel button is inactive.  If I want the KPA power on, I have to cycle the rear panel breaker or power cycle the K3. This is nuts, but my question is, is it "normal"?
>
> Wes  N7WS.
>
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[Wes Stewart-2]

Thanks.  I use a VGA cable, modified by breaking off the unneeded pins. I missed
one.

On 7/6/2016 1:28 PM, Jack Brindle wrote:
> Nope. You need to check the aux io cable. I would bet the power-on pin is connected on both sides. It should not be. Fix that and the KPA should behave normally.
>
> Jack, W6FB
>

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[Jack Brindle-2]

Did you check the VGA cable to make sure that all pins were straight-through and none connected together? Standard VGA cables break this rule and have several common pins. This, of course will wreak havoc with the AUX IO system since it requires all pins to be separate. It also means that some things will be connected improperly on the KPA500 (or the K3) which will give very unpleasant surprises.

- Jack, W6FB

> On Jul 6, 2016, at 2:59 PM, Wes Stewart <[hidden email]> wrote:
>
> Thanks.  I use a VGA cable, modified by breaking off the unneeded pins. I missed one.
>
> On 7/6/2016 1:28 PM, Jack Brindle wrote:
>> Nope. You need to check the aux io cable. I would bet the power-on pin is connected on both sides. It should not be. Fix that and the KPA should behave normally.
>>
>> Jack, W6FB
>>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Please help support this email list: http://www.qsl.net/donate.html
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[Wes Stewart-2]

Yes, I'm using SVGA extension cables ($2.80 @Cable Wholesale) that are straight
through. The male) ends have the the unneeded/unused pins broken out.  I had
missed removing a pin 8.  It's gone now and all is well.

On 7/6/2016 7:24 PM, Jack Brindle wrote:

> Did you check the VGA cable to make sure that all pins were straight-through and none connected together? Standard VGA cables break this rule and have several common pins. This, of course will wreak havoc with the AUX IO system since it requires all pins to be separate. It also means that some things will be connected improperly on the KPA500 (or the K3) which will give very unpleasant surprises.
>
> - Jack, W6FB
>
>
>> On Jul 6, 2016, at 2:59 PM, Wes Stewart <[hidden email]> wrote:
>>
>> Thanks.  I use a VGA cable, modified by breaking off the unneeded pins. I missed one.
>>
>> On 7/6/2016 1:28 PM, Jack Brindle wrote:
>>> Nope. You need to check the aux io cable. I would bet the power-on pin is connected on both sides. It should not be. Fix that and the KPA should behave normally.
>>>
>>> Jack, W6FB
>>>
>> ______________________________________________________________
>> 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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