Kpa 500 problem when auxiliary cable connected ...

[Jorge Mejia P]

I had been successfully using my KPA500 with an Icom and a  K3 , alternatively with the use of the Key Line interrupter and a separate key line.
Suddenly I cannot change bands on theKPA500  or go on Tx, even though the  auxiliary cable  is well seated and the Key line interrupter is well screwed to the K3 . The kpa500 works fine with the K3 alone, or when I disconnect the auxiliary cable from the K3 ,then I can change bands and use it with the Icom as long as I turn it off and the on again .

This happens even when the K3  is off . I have also tried disconnecting the k3s serial cable to the computer and even from the PS ,  but no luck.

Wonder if any one has experienced such a problem.

Any ideas?

Thank you
Jorge HK4CZE


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[Jorge Mejia P]

Para: [hidden email]
Asunto: Kpa 500 problem when auxiliary cable connected ...

I had been successfully using my KPA500 with an Icom and a  K3 , alternatively with the use of the Key Line interrupter and a separate key line.
Suddenly I cannot change bands on theKPA500  or go on Tx, even though the  auxiliary cable  is well seated and the Key line interrupter is well screwed to the K3 . The kpa500 works fine with the K3 alone, or when I disconnect the auxiliary cable from the K3 ,then I can change bands and use it with the Icom as long as I turn it off and the on again .

This happens even when the K3  is off . I have also tried disconnecting the k3s serial cable to the computer and even from the PS ,  but no luck.

Wonder if any one has experienced such a problem.

Any ideas?

Thank you
Jorge HK4CZE


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[Jack Brindle-2]

Make sure the RADIO setting in the K3 didn’t get changed away from K3. More specifically, it sounds like it was changed to ANALOG without having the proper pin connected to the Icom’s analog band data signal.

If that isn’t the problem, then I’ll have more questions to see how we might fix the issue.

73!

- Jack Brindle, W6FB
Elecraft Engineering

> On Aug 12, 2016, at 7:23 PM, Jorge Mejia P <[hidden email]> wrote:
>
>
>
> Para: [hidden email]
> Asunto: Kpa 500 problem when auxiliary cable connected ...
>
> I had been successfully using my KPA500 with an Icom and a  K3 , alternatively with the use of the Key Line interrupter and a separate key line.
> Suddenly I cannot change bands on theKPA500  or go on Tx, even though the  auxiliary cable  is well seated and the Key line interrupter is well screwed to the K3 . The kpa500 works fine with the K3 alone, or when I disconnect the auxiliary cable from the K3 ,then I can change bands and use it with the Icom as long as I turn it off and the on again .
>
> This happens even when the K3  is off . I have also tried disconnecting the k3s serial cable to the computer and even from the PS ,  but no luck.
>
> Wonder if any one has experienced such a problem.
>
> Any ideas?
>
> Thank you
> Jorge HK4CZE
>
>
> ______________________________________________________________
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>
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[Jack Brindle-2]

Oops. That should be the RADIO setting in the KPA500…

- Jack, W6FB

> On Aug 12, 2016, at 8:14 PM, Jack Brindle <[hidden email]> wrote:
>
> Make sure the RADIO setting in the K3 didn’t get changed away from K3. More specifically, it sounds like it was changed to ANALOG without having the proper pin connected to the Icom’s analog band data signal.
>
> If that isn’t the problem, then I’ll have more questions to see how we might fix the issue.
>
> 73!
>
> - Jack Brindle, W6FB
> Elecraft Engineering
>
>
>> On Aug 12, 2016, at 7:23 PM, Jorge Mejia P <[hidden email]> wrote:
>>
>>
>>
>> Para: [hidden email]
>> Asunto: Kpa 500 problem when auxiliary cable connected ...
>>
>> I had been successfully using my KPA500 with an Icom and a  K3 , alternatively with the use of the Key Line interrupter and a separate key line.
>> Suddenly I cannot change bands on theKPA500  or go on Tx, even though the  auxiliary cable  is well seated and the Key line interrupter is well screwed to the K3 . The kpa500 works fine with the K3 alone, or when I disconnect the auxiliary cable from the K3 ,then I can change bands and use it with the Icom as long as I turn it off and the on again .
>>
>> This happens even when the K3  is off . I have also tried disconnecting the k3s serial cable to the computer and even from the PS ,  but no luck.
>>
>> Wonder if any one has experienced such a problem.
>>
>> Any ideas?
>>
>> Thank you
>> Jorge HK4CZE
>>
>>
>> ______________________________________________________________
>> 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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>
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> Please help support this email list: http://www.qsl.net/donate.html
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[markmusick]

Jorge,
Have you checked the KPA500 menu to see what the transceiver setting is? It
could have changed for some unknown reason. It should be set to K3 for the
K3 to change bands on the KPA500.
When you say it works fine alone, is the KPA500 changing bands correctly
when you change bands on the K3 using the band change button on the K3 not
RF sensing?

Mark, WB9CIF

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Jorge
Mejia P
Sent: Saturday, August 13, 2016 12:45 AM
To: [hidden email]
Subject: [Elecraft] Kpa 500 problem when auxiliary cable connected ...

I had been successfully using my KPA500 with an Icom and a  K3 ,
alternatively with the use of the Key Line interrupter and a separate key
line.
Suddenly I cannot change bands on theKPA500  or go on Tx, even though the
auxiliary cable  is well seated and the Key line interrupter is well screwed
to the K3 . The kpa500 works fine with the K3 alone, or when I disconnect
the auxiliary cable from the K3 ,then I can change bands and use it with the
Icom as long as I turn it off and the on again .

This happens even when the K3  is off . I have also tried disconnecting the
k3s serial cable to the computer and even from the PS ,  but no luck.

Wonder if any one has experienced such a problem.

Any ideas?

Thank you
Jorge HK4CZE


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[Don Wilhelm]

Jorge,

Are you attempting to use the band decode lines on both the Icom and the
K3 at the same time?
That will cause problems unless there is some kind of isolation provided.

The fact that the K3 and KPA500 work "alone" indicates that there may be
some conflict on the band data lines.
When the K3 is off, the band data lines will go to an 'all zero'
condition which decodes to 60 meters.

73,
Don W3FPR

On 8/12/2016 8:44 PM, Jorge Mejia P wrote:
> I had been successfully using my KPA500 with an Icom and a  K3 , alternatively with the use of the Key Line interrupter and a separate key line.
> Suddenly I cannot change bands on theKPA500  or go on Tx, even though the  auxiliary cable  is well seated and the Key line interrupter is well screwed to the K3 . The kpa500 works fine with the K3 alone, or when I disconnect the auxiliary cable from the K3 ,then I can change bands and use it with the Icom as long as I turn it off and the on again .
>
> This happens even when the K3  is off . I have also tried disconnecting the k3s serial cable to the computer and even from the PS ,  but no luck.
>
>

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[Jim Brown-10]

On Mon,8/15/2016 10:28 AM, Don Wilhelm wrote:
> Are you attempting to use the band decode lines on both the Icom and
> the K3 at the same time?
> That will cause problems unless there is some kind of isolation provided.

And remember that the KPA500 does NOT need band information from the rig
-- it reads frequency with a short burst of RF and switches to the right
band. So does the KAT500. Just hit a dit or tap the mic. The only
interconnection that is NEEDED is the AMP KEY line.

The only thing that a full AUX cable adds is that it allows you to push
buttons on the KPA500 to make the K3 change bands. I don't use an AUX
cable, just RCA-RCA for AMP KEY. During contests, I do that with N1MM.
Outside of contests, I use the rocker band switch on the K3.

73, Jim K9YC

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[Eric Swartz - WA6HHQ]

The KPAK3AUX cable also switches the KPA500 band prior to transmit when you
change bands on the K3/K3S. If the cable is not present, the amp will still
change bands instantly upon transmission from any rig by measuring the
frequency, including the K3/K3S. Either method works well.

The KPAK3AUX cable also contains the AMP KEY signal, eliminating the need for
the RCA PTT cable.

If the KAT500 is also connected via the aux cables between the K3/K3S and the
KPA500, them KPAK3AUX sends frequency information from the K3 to the ATU to
select sub-band tuner segments prior to transmission.

The KAT500 will also interrupt the AMP KEY line in the KPAK3AUX cables during tune.

73,
Eric
/elecraft.com/
---
On 8/15/2016 10:39 AM, Jim Brown wrote:

> On Mon,8/15/2016 10:28 AM, Don Wilhelm wrote:
>> Are you attempting to use the band decode lines on both the Icom and the K3
>> at the same time?
>> That will cause problems unless there is some kind of isolation provided.
>
> And remember that the KPA500 does NOT need band information from the rig -- it
> reads frequency with a short burst of RF and switches to the right band. So
> does the KAT500. Just hit a dit or tap the mic. The only interconnection that
> is NEEDED is the AMP KEY line.
>
> The only thing that a full AUX cable adds is that it allows you to push
> buttons on the KPA500 to make the K3 change bands. I don't use an AUX cable,
> just RCA-RCA for AMP KEY. During contests, I do that with N1MM. Outside of
> contests, I use the rocker band switch on the K3.

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