[Elecraft] KPA-500 & KRC2

[Jack Brindle]

The KRC2 and KPA500 do a great job of sharing the Auxbus with the K3.  
You will need a cable that breaks out a connection going to both  
devices from the K3.

The KPA500's Auxbus implementation is transmit only, so it does not  
receive band information from the K3 but only talks to it as well  
defined times. This also makes it incompatible with the K2 Auxbus. It  
co-exists with the KRC2 quite well, so once you have the needed  
interconnect cable, everything should be very happy, with the KPA  
amplifying on the correct band, and the KRC2 selecting the desired  
antenna.

The cable is pretty simple. IOn the K3 side, pin 2 connects to the KPA  
connector's pin 2, and also to the appropriate pin (6 if I remember  
correctly) on the KRC2's DE9. Also needed is ground, pin 5 on the K3  
to pin 5 (again, my memory is foggy on the exact pin number) on the  
KRC2.

If you need help with this, just ask!

Jack Brindle, W6FB


On Apr 6, 2011, at 12:34 PM, Bill Coleman wrote:

> I currently use a KRC2 for band decoding with a cable from the K3 ACC
> connector simply passing AUXBUS to the KRC2.
>
> I just spotted Eric's response on AUXBUS 'missing' from the the  
> KPA-500 / K3
> cable layout in the KPA-500 manual.   But why would the band info be  
> needed
> if AUXBUS is available?
>
> How would a K3 / KPA-500 / KPC2 be connected?
>
> K3 AUX ACC Connector Pin 2 (AUXBUS) –> KRC2 J2-Pin 6    and     KRC2  
> J1-Pin
> 6 –> KPA500 AUX Pin 2   ??   (I do not use any other KPC2 J1/J2 data  
> lines)
>
> 73, Bill  N2BC
>
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