[Elecraft] How do you get N1MM to send CW to the K2?

[Vic K2VCO]

What I did with my K2 was disconnect the ALC input line to the DB9 and use that for DTR, 
since even if I did operate SSB I would not use ALC!

I connected this pin through a 1k resistor to a the base of an NPN transistor, grounded 
the emitter and connected the collector to a pair of diodes which go to the dit and dah 
lines of the K2's key input.  Then I turned the autodetect feature ON in the K2, and set 
N1MM for DTR keying.

The radio works normally with either a paddle or a straight key as well as the computer, 
and no extra wires or keying interfaces to the computer are required. It was very easy to 
hook up, and it was possible to route DTR through the same connectors from the KIO2 to the 
Control board and onto the RF board.


On 11/15/2011 7:45 PM, Guy Olinger K2AV wrote:
> You will have to use a different com port on the computer which goes to a
> level converter circuit.  That in turn will need to go to the K2's key
> jack.  There is no way with a K2 to use RTS or DTR for PTT and CW keying as
> on the K3. DTR and RTS are not recognized on the K2, with those pins in the
> DB9 jack used for proprietary purposes, including the K2's internal bus.
>
> There are also issues with direct keying from a PC, usually irregular
> spacing or what some call "jumpy" CW.  This is caused by a PC's
> multitasking.  A lot of us, including myself, have gotten around all of
> this by using a Winkey box, or a utility box that embeds the Winkey chip.
>   Microham devices embed the Winkey chip.  N1MM can be told to look for a
> winkey device on the end of a com port, and will properly drive it.  The
> box in turn provides the correct interfacing to key the K2's key jack,
> including for some of these boxes a pair of transceivers in SO2R.
>
> 73, Guy.
>
> On Tue, Nov 15, 2011 at 1:58 PM, TI2/NA7U<casey at tomochka.com>  wrote:
>
>> CAT control seems to be working from N1MM to my K2, but I always get an
>> error
>> about an incorrect CW port when I try to use the CW function keys. The
>> manual isn't clear on how this connection is made. Can CW be sent via CAT
>> or
>> do I need a special cable/circuit to accomplish this? The default port is
>> 3F8 btw.
>>
>> 73,
>>
>> Casey, TI2/NA7U
>>
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-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/