[Elecraft] KX3 feature request - locked menu option for ACC2 IO - for tx inhibit

Darren Long darren.long at mac.com
Tue Feb 17 16:32:34 EST 2015


Hi Wayne & co.

I have recently been larking about with an MFJ-1707 in the hope of using it to
prevent my newish Wellbrook loop from being sent to an early grave by my KX3.

I've modified the MFJ-1707 to achieve a closed loop solution triggered by the
KX3's keyline output, with the KX3's ACC2 input, set to "HI=Inh", driven by an
open collector stage shoved into the 1707's Aux contactor output to invert its
logic.  This solution was preferable to leaving the ACC2 input set to "LO=Inh"
as it was fail-safe in the event of the ACC2 plug coming adrift from the KX3, or
in fact any other relevant cable doing the nasty.

Now the biggest risk to the loop is if I mis-configure the ACC2 IO menu option.
Would it be feasible for this menu option to be locked?  I don't expect that
there is much call for changing it very often.

More waffle about the MFJ-1707 mod can be found here:
http://www.g0hww.net/2015/02/rx-antenna-switching-with-kx3-wellbrook.html

Cheers, 73

Darren, G0HWW


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