I've got an NCX-3 HF xcvr with a fried power supply. The rig's PS
connector is a big, square 12-pole affair. The manual says the poles
are wired like this:

1 -- power switch
2 -- power switch
3 -- -80 volt bias @ 6ma
4 -- 12,6 volt heater @ 5a
5 -- speaker ground
6 -- common ground
7 -- speaker
9 -- +280 volt @ 125 ma
11 -- +700 volt @ 300ma

(the missing poles are unused)

My question: is it possible to fire this rig with my 25 amp Astron
2-pole 13.8 volt PS, and if so, how do I wire it to that big square
plug?

TNX,

Rob Henderson
KB7PWJ

See my article "Low Power, Crummy Antenna," QST, December 1999. PDF
file available from the ARRL website:

http://www.arrl.org/tis/info/pdf/9812057.pdf