[Elecraft] K3 Keyer to use with Tascam interface

[Don Wilhelm]

That sounds like you want to build effectively a VOX circuit (to 
recognize the keying tone) and drive the PTT input.

I can think of no good reason to do that because the K3 has a very good 
VOX that works well for digital modes.
The only remote reason I can think of would be if you are running Fldigi 
with the default soundcard and also have Windows Sounds enabled - 
desiring not to key the transmitter with the Windows sounds.  But that 
is not practical since the windows sounds occur on both channels and 
that goal would be defeated entirely because the right channel sound 
would also key the transmitter through that circuit you refer to.

73,
Don W3FPR

On 1/19/2015 11:51 PM, Chris Meagher wrote:
> Hi
> I have set up a Tascam US-125M with K3/10, for work with fl-digi.
> Rather than use VOX, I would like to make a simple as possible circuit to
> take the Tascam right channel output (carrying fl-digi keyer tone) to key
> the K3 via the rear panel RCA,. Preferably electronic switching. Could use
> a 9V battery?
> Does anyone have a ready made circuit? Thanks.