[Elecraft] com port PTT question

[Cady, Fred]

You can connect your PC's com port to the K3's com port and use either RTS or DTR to key the radio. Have a look at the PTT-KEY configuration menu item in your owner's manual. Section 3.3.2 in "The Elecraft K3: Design, Configuration, and Operation" describes how to do this in greater detail. An excerpt is:

"There are at least four ways to key your K3 with a computer. The first is to use the RTS or DTR signals in the RS232 serial port connector. Your computer program must be able to send CW (and operate the push-to-talk, if needed) by activating the RTS and DTR lines. The K3 converts the RS232 signal levels (see Appendix B) to the required computer logic levels. The CONFIG:PTT-KEY menu allows you to choose which of the two RS232 signals is used for PTT and which is used for Keying. Table 3 12 shows the CONFIG:PTT-KEY menu to set up for computer keying and PTT. When using this method, make sure CONFIG:PTT-KEY and the computer program keying and PTT choices are the same."



Fred Cady
fcady at ke7x dot com
"The Elecraft K3: Design, Configuration, and Operation"
www.ke7x.com
 

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-
> bounces at mailman.qth.net] On Behalf Of iain macdonnell - N6ML
> Sent: Tuesday, September 20, 2011 9:58 AM
> To: dk5ew at mmmonvhf.de
> Cc: Elecraft at mailman.qth.net
> Subject: Re: [Elecraft] com port PTT question
> 
> Hi Erwin,
> 
> You can't connect the COM port directly to the ACC port - you need a
> transistor in the middle to convert the high/low voltages to a "pull
> to ground". Interfaces like the ones described at:
> 
> http://www.dxlabsuite.com/dxlabwiki/FSKConnection
> 
> would work.
> 
> 73,
> 
>     ~iain / N6ML
> 
> 
> 
> On Tue, Sep 20, 2011 at 3:42 PM, DK5EW <dk5ew at mmmonvhf.de> wrote:
> > Hello all,
> > I have a small problem with PTT via com port and ACC plug.
> > I made a 2 pin cable 9pol from PC to ACC 15pol to K3.
> > I soldered pin 4 for PTT and pin 5 for ground.
> > I tested it for correct wire and short - all O.K.
> > Now as soon I connect the TRX-ACC and the com port (serial 9 pin) to
> my
> > PC the K3 goes on TX.
> > Any solution out there ?
> >
> > --
> > best regards
> > Erwin/DK5EW
> >
> >
> >
> >
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