[Elecraft] KEYOUT PTT only when transverter band selected

[Don Wilhelm]

Julian,

Does your transverter have an "enable" input signal - hopefully 5 volts 
active and 0 volts inactive?  If so, you can connect it to the K3  AUX 
I/O pin 7 (XVTR ON) and set the menu CONFIG: XVn ON.
Of course, this AUX I/O pin is shared with TX INH, so if you are using 
the TX INH function, that will not work.
BUT, you can always decode the band data outputs for the transverter 
band you are using and use that for a transverter enable (or gate the 
PTT input to the transverter with the band data decoded).

73,
Don W3FPR

Julian, G4ILO wrote:
> I don't have a linear amplifier. I do have a transverter, and I use the KEY
> OUT jack to put it into TX. Trouble is, it puts the transverter into TX
> whatever band I'm using. For LO stability reasons (not to mention that I can
> never remember to switch the transverter off when I'm not using it) I'd
> prefer to be able to leave the transverter switched on but only receive a
> PTT signal when the VHF band is selected. I think that means I'd need a
> circuit that combines the state of DIGOUT0 with KEYOUT-LP, such that it
> grounds the transverter PTT input when DIGOUT0 is 0V and KEYOUT-LP is
> grounded. Has anyone made something like that?
>   
>