[Elecraft] Problems with band decoder

[Randy Farmer]

You don't say, but I presume the band decoder is operating 
correctly.Since the band change function of the KPA500 works, this says 
that the serial data bus between the amp and the radio is working fine. 
The band decoder may be loading down the 4 band data lines to the point 
they don't make the logic "1" voltage the KPA500 needs. It's probably a 
major pain, but try measuring the voltages on the 4 band data lines with 
a DVM with everything connected and report back the logic "1" (most 
positive) voltage you see on the data lines as you cycle through the 
bands. The KPA500 should still change bands properly if you give it a 
short shot of RF, but the situation should really be corrected.

73...
Randy, W8FN

On 7/12/2016 11:07 AM, Jim Spaulding wrote:
> I am using a Y cable from the K3 Aux port to a KPA500 and a WX0B band 
> decoder for a six pack antenna switch.   When the Band Decoder is 
> added, the KPA500 does not automatically follow band changes from the 
> K3 although band changes on the KPA500 flow to the K3.  Has anyone 
> else had this problem and is there an easy fix?
>
> Jim
>
> W0UO
>
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