[Elecraft] Interface for MRP 40

[nr4c]

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
>> >
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