[Elecraft] Aux 12V o/p mod for K2/100~KAT100 portable use

[Fraser Robertson]

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

_________________________________________________________________
MSN Messenger 7.5 is now out. Download it for FREE here. 
http://messenger.msn.co.uk