You'll need a "band decoder". Try a Top Ten Devices Yaesu decoder or a  
Universal Microsystems BCD 10, which is very affordable. These devices  
convert from BCD to a separate wire per band.

Dick, K6KR

Sent from my iPhone

On Oct 16, 2009, at 6:17 AM, Ken Adams K5KA <[email protected]> wrote:

> I have searched archives galore and cannot find, or do not know how to
> search properly for interfacing the K3 to the Dunestar 600 Bandpass
> filters.  Has someone built a cable that goes directly from the K3 Aux
> I/O port to the Dunestar such that it will automatically switch in the
> correct bandpass filter?
>
> 73, Ken K5KA
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