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[K3] PTT ??

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Phil Hystad-3

[K3] PTT ??

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.

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.

73, phil, K7PEH

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Vernon Mauery

Re: [K3] PTT ??

On Sun, Mar 13, 2011 at 11:04 PM, Phil Hystad <[hidden email]> 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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Phil Hystad-3

Re: [K3] PTT ??

Thank you Vernon and thanks to all the others who have answered my questions on and off the reflector. I have already wired up a temporary switch this afternoon and things work just fine.

73, phil, K7PEH

On Mar 14, 2011, at 8:14 AM, Vernon Mauery wrote:

> On Sun, Mar 13, 2011 at 11:04 PM, Phil Hystad <[hidden email]> 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
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>