[Elecraft] KRC2ACC with K3 and Navigator an P3

[Don Wilhelm]

Brian,

The recommended K3 to KRC2 communication is to use the AUXBUS signalling 
for band signalling.  The AUXBUS signal is on pin 2 of the K3 ACC 
connector with the return path at pin 5 (ground).  You can get a "Y" 
connector to bring the ACC signals out to both the Navigator and the 
KRC2ACC.  Make certain the "Y" cable has all pins connected and no pins 
connected together - a VGA "Y" cable will NOT work.

Please not that the solution above will only provide band selection in 
the KRC2ACC - other functions will not work.

One cannot use a "Y" connector on the RS-232 signals unless one device 
only listens to the RS-232 data traffic.  Both the P3 and the KRC2ACC 
have drivers on the RS-232 connection and that will cause much chaos and 
failure of communications for both the KRC2ACC and the P3.

In other words, I do not have a workable solution for you.  Perhaps Jack 
Brindle can make some suggestions, but from my knowledge of the RS-232 
signalling, they will not work together.

My suggestion is to load the KRC2 firmware and forget about the ACC 
option, then you can use the KRC2 for control of your antenna relays 
with the connection to the K3 ACC connector (with the "Y" cable).

73,
Don W3FPR

On 6/23/2013 4:44 PM, Brian F. Wruble wrote:
> Hi all,
>
> OK, I have built my KRC2ACC, and it passes all the tests. I have built the
> special cable for use with my K3.  Now  am stumped again, so I am hoping
> someone can "baby-talk" me through this.
>
> I use a Navigator interface for digital modes.  That occupies the ACC jack
> of the K3.  I use a P3 Panadaptor, and that occupies the serial (RS232)
> port of the K3.  The Navigator uses the RS232 port of the P3.  There is no
> place left to connect the KRC2ACC.
>
> The manual makes reference to "daisy-chaining", but always in connection
> with the K2, not the K3.  So I am stuck again.
>
> Where do I plug it in, and what jumpers do I set?
>
> Thanks in advance,
>
> Brian W3BW
>
>
>
>
> *Brian F. Wruble, C.F.A.
>
> *70 is the new 40.*
> *
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