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com port PTT question

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DK5EW

com port PTT question

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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Iain MacDonnell - N6ML-2

Re: 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 <[hidden email]> 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
>
>
>
>
> -----
> eMail ist virenfrei.
> Von AVG überprüft - www.avg.de
> Version: 10.0.1410 / Virendatenbank: 1520/3907 - Ausgabedatum: 19.09.2011
> ______________________________________________________________
> 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
>

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Don Wilhelm-4

Re: com port PTT question

In reply to this post by DK5EW

If you are directly connecting a serial port signal pin to the K3 ACC
PTT, that will cause trouble, and may damage the K3. The voltages out
of a serial port can be up to 25 volts, both positive and negative. You
need some sort of conversion (a single transistor keying circuit) to
drive the K3 PTT input between 5 volts and ground levels.

On the other hand, the K3 already has provision for PTT and Keying
through the serial port DTR and/or RTS signals. You probably have a
serial cable between the K3 and the PC for loading firmware, so use that
connection and set the CONFIG: PTT--KEY menu to whichever line your
software is using for PTT.

73,
Don W3FPR

On 9/20/2011 11:42 AM, DK5EW 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 ?
>
______________________________________________________________
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Cady, Fred

Re: com port PTT question

In reply to this post by Iain MacDonnell - N6ML-2

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: [hidden email] [mailto:elecraft-
> [hidden email]] On Behalf Of iain macdonnell - N6ML
> Sent: Tuesday, September 20, 2011 9:58 AM
> To: [hidden email]
> Cc: [hidden email]
> 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 <[hidden email]> 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
> >
> >
> >
> >
> > -----
> > eMail ist virenfrei.
> > Von AVG überprüft - www.avg.de
> > Version: 10.0.1410 / Virendatenbank: 1520/3907 - Ausgabedatum:
> 19.09.2011
> > ______________________________________________________________
> > 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
> >
> ______________________________________________________________
> 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

DK5EW

Re: com port PTT question

TNX all for advice. !
I tried via RS232/USB FTDI but that caused problems with WSJT. As I want
to use also CAT I decided to go via 15pol ACC and PC's com 1.
Now I made that simple npn transistor solution and that works fine now.
73's Erwin/DK5EW
http://www.dk5ew.de

Am 20.09.2011 19:13, schrieb 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: [hidden email] [mailto:elecraft-
>> [hidden email]] On Behalf Of iain macdonnell - N6ML
>> Sent: Tuesday, September 20, 2011 9:58 AM
>> To: [hidden email]
>> Cc: [hidden email]
>> 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<[hidden email]> 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
>>>
>>>
>>>
>>>
>>> -----
>>> eMail ist virenfrei.
>>> Von AVG überprüft - www.avg.de
>>> Version: 10.0.1410 / Virendatenbank: 1520/3907 - Ausgabedatum:
>> 19.09.2011
>>> ______________________________________________________________
>>> 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
>>>
>> ______________________________________________________________
>> 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
>

-----
eMail ist virenfrei.
Von AVG überprüft - www.avg.de
Version: 10.0.1410 / Virendatenbank: 1520/3908 - Ausgabedatum: 20.09.2011
______________________________________________________________
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