[Elecraft] KAT500 to K3 and KPA500 Cabling

[Gary Gregory]

Perhaps I should explain further. I have not used (read never) had the Y
cable in use as I don't have another device needing to share the AUX output
for the K3 and have always used the supplied Auxbus cables and I still do
so.

The 'feature' seemed to appear after I switched the longer Auxbus cable
with the shorter cable as it made for better cable routing at the time.

When I switched the K3 power on the KPA500 had the rear switch on also and
both the K3 and KPA500 turned on. The KPA500 front panel power switch does
not work to power off the amplifier until the K3 is switched off and then
it works as expected.

I know folks wanted this to happen when the kpa500 was released and now I
have it working I am reluctant to see it stopped.

I see no reason why this works as it does as the only difference I have
made appears to be switching the Auxbus cables.

Puzzling, but not at all unwelcome behavior...:-)

73's
Gary

On 12 December 2012 08:36, Richard Ferch <ve3iay at storm.ca> wrote:

> According to the description of the AUX Connector Interface in the KPA500
> manual, pulsing pin 8 low momentarily will turn the KPA500 on or off. It's
> not supposed to be held low (FWIW, there's an exclamation point in the
> manual beside the note that explains this). The KPAK3AUX cable does not
> have pin 8 connected, but the Y cable does, so perhaps connecting pin 8
> together between the K3 and the KPA500 is responsible.
>
> Pins 1, 6, and 7 are also used for different purposes by the K3 vs. the
> KPA500. In particular, the KPA500 manual says that pin 7 "must not be
> connected to K3". Pins 1, 6, 7 and 8 are all not connected in the KPAK3AUX
> cable, and this is presumably why.
>
> I'm not sure I'd want to risk using the Y cable in place of the KPAK3AUX
> cable, or at least not without removing a few pins first.
>
> 73,
> Rich VE3KI
>
>
>  And if you end up having the KPA500 powering up when you turn on the K3
>> it's one of those undocumented features.....:-)
>>
>> I have checked my settings and I cannot see what has changed, but the
>> behavior is not unwelcome, just mystifying.
>>
>> Gary
>>
>> On 12 December 2012 04:34, AE4CW <ae... at att.net> wrote:
>>
>>  Yes, it does appear that the "Y" cable that comes with the
>>> "KPAK3AUX Optional KPA500 to K3 AUX Cable" kit can be used
>>> to connected the KAT500 to the KPA500.  I am doing so and
>>> all seems to work correctly.  And, of course, the KPAK3AUX
>>> cable should be used between the K3 and the KAT500.
>>> You end up with an unused branch of the "Y" cable, but it's
>>> a lot more compact than another three foot KPAK3AUX cable!
>>>
>>
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-- 
*Gary - VK1ZZ
Motorhome Portable
The Shack*
*Elecraft K3
P3 Panadapter
KPA500FT
KAT500FT**
KX3-K
*