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Interface for MRP 40

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Gavin Keegan

Interface for MRP 40

I would like to use the MRP40 CW program with my K3 (1336) connected to
my laptop and need details of a suitable interface unit, preferably
homebrew. Can anyone help with either a design or details of a
proprietarily made unit please? Gavin Keegan - G6DGK

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Brendan Minish

Re: Interface for MRP 40

Since MRP40 CW uses the computer's sound card all you need with the K3
is a 1/8" stereo jack to hack cable
the K3 already has a line out that is transformer isolated and at the
appropriate level to drive PC sound-cards

I see that MRP40 CW advocates using AFSK in SSB to send CW, please don't
since unless very carefully done with a high quality computer soundcard
it will result in a very wide and grotty transmitted signal. I hear
quite a few crappy AFSK CW signals on the bands and I am pretty tired of
having QSO's ruined by AFSK CW a couple of KHZ away from me.

the K3 has the hardware required to CW key and activate PTT via RS232
built in

In summary, you need an audio cable and perhaps an RS232 cable

On Tue, 2011-05-24 at 09:34 +0100, Gavin Keegan wrote:

> I would like to use the MRP40 CW program with my K3 (1336) connected to
> my laptop and need details of a suitable interface unit, preferably
> homebrew. Can anyone help with either a design or details of a
> proprietarily made unit please? Gavin Keegan - G6DGK
>
> ______________________________________________________________
> 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

--
73
Brendan EI6IZ

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Charles Tropp

Re: Interface for MRP 40

In reply to this post by Gavin Keegan

I use the SignaLink USB sound card by Tigertronics which is recommended
by the MRP40 software. See http://www.tigertronics.com/ You will want to
also order the Elecraft K3 rear panel radio cable and the SLMODK3 Plug
and play jumper module. This is not homebrew and the price is $105 plus
$10 for the jumper. Just so you know, the MRP40 software like all CW
decoding programs suffers from severe limitations. Unless you are
receiving the signal loud and clear and the sender is sending near
perfect code (preferably computer generated), you will see a lot of
garbage. Your own brain decoding CW works a lot better.

On 5/24/2011 4:34 AM, Gavin Keegan wrote:

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Nr4c

Re: Interface for MRP 40

In reply to this post by Gavin Keegan

To decode the CW signals, (no transmit) all you need do is use a patch
cord (1/8 inch stereo both ends) from the LINE OUT on bacxk of the K3
and connect to LINE IN or MIC IN on the computer sound card.

For TX, see the uper partr of the schematic shown here:
http://www.polar-electric.com/Morse/MRP40-EN/IF.gif, the part with the
opto-couplers. A patch cord from computer OUT to K3 LINE IN Will get
you the audio. The K3 already has transformer isolated in/out on the
LINE interface.

....bc nr4c

On Tue, 24 May 2011 09:34:11 +0100, Gavin Keegan wrote:

> I would like to use the MRP40 CW program with my K3 (1336) connected
> to
> my laptop and need details of a suitable interface unit, preferably
> homebrew. Can anyone help with either a design or details of a
> proprietarily made unit please? Gavin Keegan - G6DGK
>
> ______________________________________________________________
> 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

Brendan Minish

Re: Interface for MRP 40

The requisite keying interfacing for DTR and RTS is ALREADY built into
the K3
you just need to enable it on the K3
No need for any interface, just an RS232 cable

On Tue, 2011-05-24 at 10:00 -0400, nr4c wrote:

> To decode the CW signals, (no transmit) all you need do is use a patch
> cord (1/8 inch stereo both ends) from the LINE OUT on bacxk of the K3
> and connect to LINE IN or MIC IN on the computer sound card.
>
> For TX, see the uper partr of the schematic shown here:
> http://www.polar-electric.com/Morse/MRP40-EN/IF.gif, the part with the
> opto-couplers. A patch cord from computer OUT to K3 LINE IN Will get
> you the audio. The K3 already has transformer isolated in/out on the
> LINE interface.
>
> ....bc nr4c
>
>
> On Tue, 24 May 2011 09:34:11 +0100, Gavin Keegan wrote:
> > I would like to use the MRP40 CW program with my K3 (1336) connected
> > to
> > my laptop and need details of a suitable interface unit, preferably
> > homebrew. Can anyone help with either a design or details of a
> > proprietarily made unit please? Gavin Keegan - G6DGK
> >
> > ______________________________________________________________
> > 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

Nr4c

Re: Interface for MRP 40

Thanks for this note. I had completely forgotten this capability. I
have to use a second RS-232 port for keying my rig due to software
restraints (N3FJP won't use same serial port for CW as CAT).

...bc nr4c

On Tue, 24 May 2011 15:24:25 +0100, Brendan Minish wrote:

> The requisite keying interfacing for DTR and RTS is ALREADY built
> into
> the K3
> you just need to enable it on the K3
> No need for any interface, just an RS232 cable
>
> On Tue, 2011-05-24 at 10:00 -0400, nr4c wrote:
>> To decode the CW signals, (no transmit) all you need do is use a
>> patch
>> cord (1/8 inch stereo both ends) from the LINE OUT on bacxk of the
>> K3
>> and connect to LINE IN or MIC IN on the computer sound card.
>>
>> For TX, see the uper partr of the schematic shown here:
>> http://www.polar-electric.com/Morse/MRP40-EN/IF.gif, the part with
>> the
>> opto-couplers. A patch cord from computer OUT to K3 LINE IN Will
>> get
>> you the audio. The K3 already has transformer isolated in/out on
>> the
>> LINE interface.
>>
>> ....bc nr4c
>>
>>
>> On Tue, 24 May 2011 09:34:11 +0100, Gavin Keegan wrote:
>> > I would like to use the MRP40 CW program with my K3 (1336)
>> connected
>> > to
>> > my laptop and need details of a suitable interface unit,
>> preferably
>> > homebrew. Can anyone help with either a design or details of a
>> > proprietarily made unit please? Gavin Keegan - G6DGK
>> >
>> > ______________________________________________________________
>> > 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

Brendan Minish

Re: Interface for MRP 40

In this case you may wish to consider just breaking out the RTS and DTR
lines and connecting them to your second com port
the grounds can be tied together (pin5)

On Tue, 2011-05-24 at 10:31 -0400, nr4c wrote:

> Thanks for this note. I had completely forgotten this capability. I
> have to use a second RS-232 port for keying my rig due to software
> restraints (N3FJP won't use same serial port for CW as CAT).
>
> ...bc nr4c
>
>
> On Tue, 24 May 2011 15:24:25 +0100, Brendan Minish wrote:
> > The requisite keying interfacing for DTR and RTS is ALREADY built
> > into
> > the K3
> > you just need to enable it on the K3
> > No need for any interface, just an RS232 cable
> >
> > On Tue, 2011-05-24 at 10:00 -0400, nr4c wrote:
> >> To decode the CW signals, (no transmit) all you need do is use a
> >> patch
> >> cord (1/8 inch stereo both ends) from the LINE OUT on bacxk of the
> >> K3
> >> and connect to LINE IN or MIC IN on the computer sound card.
> >>
> >> For TX, see the uper partr of the schematic shown here:
> >> http://www.polar-electric.com/Morse/MRP40-EN/IF.gif, the part with
> >> the
> >> opto-couplers. A patch cord from computer OUT to K3 LINE IN Will
> >> get
> >> you the audio. The K3 already has transformer isolated in/out on
> >> the
> >> LINE interface.
> >>
> >> ....bc nr4c
> >>
> >>
> >> On Tue, 24 May 2011 09:34:11 +0100, Gavin Keegan wrote:
> >> > I would like to use the MRP40 CW program with my K3 (1336)
> >> connected
> >> > to
> >> > my laptop and need details of a suitable interface unit,
> >> preferably
> >> > homebrew. Can anyone help with either a design or details of a
> >> > proprietarily made unit please? Gavin Keegan - G6DGK
> >> >
> >> > ______________________________________________________________
> >> > 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
>
> ______________________________________________________________
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> Post: mailto:[hidden email]
>
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