[Elecraft] KX3: 4m transverter enabling DC on SMA ?

[David Anderson]

I read in the FAQ for the transverter

http://www.elecraft.com/manual/KX3-2M%20FAQ.htm

Q:  Does the module provide a DC signal at the antenna jack for external switching functions? 
 
A:  Yes. We're adding a menu entry to control this. When the signal is turned on, 5 volts (through a 4-kohm series resistor) is applied to the SMA jack. This can be used to control external devices such as a higher-band transverter, amplifier, or antenna switch.

Has this been done, and if so what is the menu item I am looking for?

73 from David GM4JJJ