[Elecraft] K2 and N1MM+

[Bill Coleman]

The N1MM documentation shows a simple circuit for keying via DTR/RTS or parallel port using a 1K resistor and an NPN transistor (2N2222 or equivalent): https://n1mmwp.hamdocs.com/setup/interfacing/


> On Dec 8, 2021, at 9:44 AM, Bill Coleman <aa4lr at arrl.net> wrote:
> 
> 
> 
>> On Dec 7, 2021, at 4:13 PM, edauer at aya.yale.edu wrote:
>> 
>> I need advice for getting N1MM+ to play well with a K2. 
> ...
>> I know that when using my K3 with N1MM it's necessary to have the K3's menu
>> settings for DTR and RTS set properly to CW to match the settings in N1MM .
>> . . but I have found no such option in the K2 menus.  I have also read that
>> it can be done using a W1EL keyer, but having outboard dongles sort of
>> defeats my purpose.
>> 
>> Can it be done with just the K2/KIO2, a KUSB cable, and an ordinary
>> computer?
> 
> The K2 serial interface does NOT support DTR or RTS. It only supports three wires - TxD, RxD and Ground.
> 
> One CAN run a K2 with KIO2 or KPA100 on a single serial port and key CW. But you have to build your own adapter to take the DTR signal and key the rig through the KEY connector. The adapter consists of a transistor and resistor, so it can be easily built into a connector housing. 
> 
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
> Web: http://boringhamradiopart.blogspot.com
> Quote: "Not within a thousand years will man ever fly!"
>           -- Wilbur Wright, 1901
> 
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Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901