If you look at the schematics of the KATU, you'll see the chain of
shift registers on the KATU actually sends a signal back to the RF
board. So the CPU sends the command to the KATU and if the ATU
doesn't respond (via the MISO3 line), the CPU interprets that to mean
the KATU isn't present
As for handling 100 watts, I don't see a problem as I use the exact
same OMRON relay the KATU does and I considered inductance in the pc layout
Ken
At 11:34 AM 6/19/2016, ab2tc wrote:
Hi,
Is there any reason why this should not work with a K3/100 also? BTW, how do
you convince the firmware that an ATU is installed? When I press "ANT" on my
ATU-less K3/100 I get the message "NO ATU". If both these concerns can be
put away, count me in, too. I have always been bummed that I can't get two
antennas without installing the ATU which I do not want to do. I consider an
ATU to be part of the antenna system and should be installed as close to the
antenna as possible (my KAT 500 is at the far end of a 100' coax run).
AB2TC - Knut
PS. If this is a double posting, I apologize. I *hate* hot keys.
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