[Elecraft] KPA500 not reading Band Data

[Don Wilhelm]

You may be looking at it backwards - the K3 is always the source for the 
band data.  The K3 tells everything else what band it is on and expects 
all others to react accordingly.  The band buttons on the KPA500 will 
change the K3 band if the ACC cable is connected properly.  Your "Y" 
cable may be creating a situation that needs to be addressed.  I do not 
know the details.  The solutions got more complex when the K3 was forced 
to add pullup resistors to the band data lines because many customers 
did not know how to handle open drain outputs - with the KPA500 
introduced to the mix, the situation of multiple devices listening to 
the band data signals becomes more complex.

BTW - there are no dashes (or spaces) in Elecraft model numbers - it is 
the "K3" rather than the "K-3" and "KPA500 instead of "KPA 500" - there 
are 2 mini-modules that violate that convention, the N-Gen and the 
2T-Gen -- all other models have no dashes.

73,
Don W3FPR

On 7/13/2012 8:20 PM, w0uo wrote:
> Elecrafters:
>
>   
>
> I just installed a "Y" cable from my K-3 to an Array Solutions DBS-1 band
> decoder and my KPA 500.  The band decoder follows the K-3 perfectly, but the
> K-3 doesn't read band data.  It does tell the K-3 when it is on standby and
> operate and the K-3 sets the power level accordingly.  From this I assume
> that it is not reading the four band data pins (when powered up it reads 5.3
> MHz, all logic zeroes, and does not change until it senses RF).
>
>   
>
> Has anyone had the same or similar problem and found a solution?
>
>   
>
> Jim Spaulding W0UO
>
> w0uo at arrl.net
>
> 817 448 8024 (home)
>
> 817 713 9928 (cell)
>
>   
>
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