[Elecraft] K2, FD, and N1MM

[Kevin]

I have done it both ways. The transistor interface and an outboard 
keyer, the Winkey USB.

I prefer the Winkeyer because it makes it easy to hook up the paddle and 
computer. I don't know of a contesting program that doesn't support it. 
It also avoids the Windows multi-tasking issues which can occasionally 
screw up the sent code. It's also a kick but standalone keyer. Better 
than the one in the K2.


On 7/8/2016 12:48 PM, Jim Brown wrote:
> On Fri,7/8/2016 10:17 AM, Robert G Strickland wrote:
>> So, as Guy states and Don infers, using an interface device is 
>> probably preferable to a direct computer-radio setup. YMMV and OMD. 
>
> When I used a K2 for contesting, I made up a simple adapter that split 
> out the DTR line from the computer to an NPN transistor that keyed the 
> radio. Details begin on page 51 of this set of Power Point slides. The 
> NPN inverter is shown on page 53. Following slides suggest how to get 
> varying degrees of fancy.
>
> http://k9yc.com/HamInterfacing.pdf
>
> As has been noted, the K2 does NOT have a standard RS232 interface, 
> and a standard DB9 cable wired for RS232 CANNOT be used directly. The 
> K2 uses pins 2, 3, and 5 for serial interface. Other pins are used for 
> other functions. When you build a K2 accessory that has a DB9 
> connector, clear instructions are provided for building a suitable 
> cable to interface to a standard RS232 port.
>
> One thing that was WRONG about K2 accessory kits was that Elecraft 
> provided parallel wire cable for the interface. That cable SHOULD use 
> twisted pairs, one pair for each signaling circuit between the K2 and 
> the computer. Ordinary CAT5 cable is an excellent choice. This is 
> shown on pages 53-55.
>
> I successfully used this setup to control and key the radio both with 
> WriteLog and N1MM.
>
> 73, Jim K9YC
>
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