I did this small mod to power the KAT100 from my K2/100, to simplify wiring
when operating portable. I added a miniature slide switch across D10 on the
main K2 board. Closing the slideswitch makes the original K2 12V socket
into an aux 12V output. A short cable (4") with a power plug on each end
then links between the K2 and KAT100. Even with D10 shorted in this way, F1
and D12 give a level of reverse polarity protection should a 12V source be
plugged into the K2. However, normal operation (aux 12V in) with full
reverse polarity protection can easily be restored by opening the slide
switch.
I made up a short PL259 cable (6") to link the K2/100 RF into the KAT100.
Also, a short (5") cable for the data connection, with an additional 9 way
socket on a 5" cable to take a standard RS232 cable should a PC link be
required. This is wired as per the KAT100 manual.
Finally I use a length of 25way (1.25" wide) grey ribbon cable, which wraps
around the K2/100 with KAT100 below, near the front (running behind the
KAT100 front feet and in front of the K2/100 heatsink). This is secured to
itself using velcro underneath the KAT100. Along with the mating back feet,
this gives single stand alone/wired unit that is very convenient for taking
out portable, without any hole drilling/brackets, or other irreversible
mods.
73 Fraser G4BJM #4368
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