[Elecraft] "Turn on the KPA500" Error

[Stewart Bryant]

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/

73

Stewart/G3YSX

>
> 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.
>>
>