What are the values of the pulp resistors on the decoders, and what voltage do they pull up to? If 12V, the yes, you really need to worry about the 2.2K resistors and that 1K series.
Even at 5V you may have to do so. Work the problem out on paper - simple ohms law. Then determine if the low voltage that is presented to the decoder chip inputs is actually a low to those devices.
There are ways to make it work, just need to figure out where things are to start with.
73!
Jack, W6FB
> On Apr 28, 2019, at 5:14 PM, William Liporace <
[hidden email]> wrote:
>
> Hi Folks,
> I am having an issue with the band data out from the K3s and K3S. Both have are basically new. The K3S was NEW in Aug 2018 and the K3s had the I/O board replaced at the same time. Both units have the same issue. They don't seem to be able to drive band data input of a couple of antenna switches. The one switch has a 1K input resistor. If I change them to a 100 ohm resistor, they work fine.
>
> So my questions are:
>
> Is this normal?Should the band data work on the newer gear?
> What am I missing?
> Can someone tell me what to do?
>
> yes, I know about the 2.2K resistors, but should I need to?
>
> TNX Will WC2L
>
> --
> William Liporace WC2L
>
http://www.wc2l.com or
http://dxc.wc2l.com> AR-Cluster Node telnet dxc.wc2l.com or 144.93 MHz
>
[hidden email]
>
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