[Elecraft] K3 PTT -- done!

[Vic K2VCO]

Don Wilhelm wrote:
> Joe and all,
> 
> I have the same questions.
> 
> Since no one has explained the difference between 'Transmit mode' and 
> "the K3 is now transmitting since QSK has been started with a keypress" 
> - I would believe that the PTT input is redundant when in QSK or 
> Semi-break-in modes.

Transmit state: it's 1954, your knife switch has the antenna connected 
to the transmitter, the B+ of the transmitter is on, the receiver is 
silent. Press the key and you transmit.

> Yes, a little clarification (or language lessons) seem to be appropriate 
> here.
> How is 'Transmit mode' different from 'transmitting already because the 
> key was tapped'?

If you are in QSK or Semi QSK, tapping the key PUTS you in transmit 
state, then generates RF, then takes you back to receive state.

If you are in PTT mode, then you MUST first close the PTT before you can 
transmit. It's not automatic, like QSK or semi.

> Does closing PTT when in QSK mode inhibit a return to receive until the 
> PTT is released? - that is the only thing I can think of.

Closing the PTT regardless of mode switches you to transmit state.  It 
mutes the receiver (except for the sidetone) and activates the amp key 
(or whatever you use this output for, like switching VHF preamps). Then 
when you press the key it transmits.

The difference is that in PTT mode the key can't put you in transmit 
state -- only the PTT switch can do that. In QSK mode, it's all 
automatic, but the PTT switch is still active and can put you into 
transmit state and keep you there for as long as you hold it.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco