[Elecraft] [K3] PTT ??

[Vernon Mauery]

On Sun, Mar 13, 2011 at 11:04 PM, Phil Hystad <phystad at mac.com> wrote:
> Question:  does the PTT IN RCA/Phono connection merely operate a relay or switch in the K3?  That is, by shorting the connection (closing the switch) I am operating a relay switch that stays closed as long as my switch (short) is closed.

I rigged up a momentary push button switch to short out the
connection.  That works great for me.  I also have an electronic key
that I built that uses a transistor to 'close' the circuit.  Either
way works.  I don't know if internally it is a switch or relay or
what, but it is awfully quiet to be a relay.

> Also, I would like to know if it is normal (do other guys do this?) to use multiple PTT switches wired in parallel probably using some parallel connection phono jack thingy.  I have at least two switches (one a foot switch to use with a mic and the other a externally controlled switch for my Signalink USB interface).  Maybe a third switch for a hand held switch for another mic that I might use at times.  No probably not three, but at least two different switches.

It would certainly be possible to wire up several switches in
parallel.  If they are mechanical switches, then it won't hurt them at
all.  If they are electronic switches, you might want to add in some
circuitry to protect from a short (depending on what kind of output
stage we are talking about).

--Vernon N7OH

> 73, phil, K7PEH
>
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