[Elecraft] Interface for MRP 40

[Brendan Minish]

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
> >> >
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-- 
73
Brendan EI6IZ