[Elecraft] New KPA500 problem.

[Jack Brindle]

Steve;

The KPA is getting info that indicates that the input band is invalid. This is either coming from the radio’s BCD pins or from RF sampled by the KPA500. First thing to make sure is that the pins in the AUX cable are contacting properly, and are not bent and thus not plugging in properly. Check this on both cables, all four connectors. 

Did you get this indication without transmitting any RF? If you did get it from an RF transmission, that would indicate that the sampled RF is outside the acceptable range of the KPA. This range is from 1.6 to 26 MHz and from 28 to 54 MHz.

Let’s see what we can do to gt you going - I may ask for a fault log if your checks don’t fix things so I can see exactly where the band problem is being picked up.

73,
Jack, W6FB
Elecraft Engineering


> On May 14, 2021, at 8:47 AM, Steve Fox <ka4fox at gmail.com> wrote:
> 
> In a mild panic here. Need some wise advice. 
> 
> Set up my brand new KPA500 and KAT500 today with my K3. Used only Elecraft cables and followed the wiring configuration carefully. Set the K3 for bypass of the internal ATU. All the KPA menu items are set to factory default. 
> 
> When I power up the KPA the screen says INVALID.  My limited understanding is that the KPA thinks it is being told to operate outside of its frequency range. But the K3 is set to 80m and well within the band edges. 
> 
> My thinking is we have a failure to communicate in that the K3 is not sending the frequency to the KPA, perhaps sending no info at all.
> 
> Any thoughts?  I’m assuming I have overlooked a simple setting on the K3 and/or the KPA. 
> 
> Tnx and 73
> 
> Steve
> KA4FOX
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