[Elecraft] Kpa 500 problem when auxiliary cable connected ...

[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.
>
>