[Elecraft] "Turn on the KPA500" Error

[Don Wilhelm]

Stewart,

Yes, you will either have to keep the XV144 powered or disconnect the 
AUX cable when you remove the 12V power from the XV144.

73,
Don W3FPR

On 8/22/2016 12:00 PM, Stewart Bryant wrote:
>
>
> On 19/08/2016 15:15, Don Wilhelm wrote:
>> 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).
> This is the mode that it operates in.
>>
>> 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.
>
> OK - I have the oven heater on when not selected, and turn the XV144 
> PSU off if I want to turn the oven off because I am unlikely to use 2M 
> for a while. From the sound of it I need to keep it powered up 
> whenever the K3 is on. A minor irritation since they use separate 
> supplies/
>