I long ago built this into my K2. I used the wire intended for ALC, which I don't use, connected to the DTR pin of the DB9. The ALC line conveniently goes to the K2 control board through the connector with the RF board. I put the transistor on the back of the control board, along with a pair of Schottky diodes connected to the dit and dah inputs to the microprocessor. Then all I had to do was activate the K2 menu option that allows simultaneous paddle closure to key the rig. No extra wires needed.
Vic 4X6GP > On 8 Jul 2016, at 20:48, Jim Brown <[email protected]> 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 > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
