[Elecraft] "Turn on the KPA500" Error

[Don Wilhelm]

Stewart,

It sounds like you have the XV144 JP7 jumpered and not JP8 - otherwise 
you would not be able to power the XV144 on/off with the front panel switch.
With the jumper on JP8 and none on JP7, the XV144 will power itself on 
when you select the 144MHz band (actually the K3 TRN address that 
matches the address set into the the XV144 DIP switches).

In order for this selection to happen, you must have 12 volts at the 
power jack of the XV144 whenever the K3 is powered on.

If you are turning the XV144 off at its power supply, then I suspect it 
will load the K3 AUX signal and cause "strange behavior" in the K3.

The solution is to leave power on the XV144 - no debugging necessary.

73,
Don W3FPR

On 8/19/2016 9:46 AM, Stewart Bryant wrote:
> I have a K3 connected to an XV144 in the preferred configuration shown 
> in the manual with the AUX port used for band switching.
>
> Occasionally I find that with the XV144 powered down the K3 hangs 
> complaining that the KPA500 needs to be turned on. I can cure this by 
> powering on the XV144 or by disconnecting the Aux lead from the XV144.
>
> Is this a fault on one of my component's (K3, cable or XV144), a bug 
> or a feature.
>