Rig - Computer CW Interface
 

  I have added CW sending features including real time keyboard, preprogrammed strings and even on-the-air code practice modules to all of my logging programs. To send CW using my software, connect your computer to your rig via either the computer's serial or parallel (printer) ports. The software uses either the RTS Line or the DTR Line of the serial port or the parallel port to send the key down command.

  If you would like to make your own interface, below are two schematics for building an interface using the RTS line. Any transmitter that uses a "connect to ground to key" jack can use either of these schematics. Thanks to Bob, N3UR, for providing these schematics!

Direct Keying Schematic

 
(The resistor value is 4.7k)
 

Optic Coupling Schematic
(electrically separates the computer from the radio)

  If you would like to purchase an interface, I have found a great supplier who is willing to help you out! W1GEE Products provides both PC Serial and Parallel Keying Modules. The serial module has been designed to provide a hardware link to your transceiver from your computer's DB-9 serial port using the DTR (pin 4 of the DB-9 connector) lead as the active signal and SGND (pin 5) as reference ground.  The parallel module uses pin 17 as the active signal and pin 1 as ground.

  Using my N3FJP's software programs, you can use your computer to replace the transceiver's straight key to send code. A separate key is no longer required; although one can be connected in parallel with the keying plug if desired. Please note that these units replace the STRAIGHT KEY. To function properly, you must turn off your transceiver's automatic keyer and plug the unit into the STRAIGHT KEY socket. Keying is accomplished by the tip and sleeve of the Keying Module plug in the same manner as a straight key would do.

  Product Purchase Options

  PC Serial Keying Module - $25.00

  PC Parallel (printer) Keying Module - $25.00

  Please send Cash, Check, or Money Order payable to G. Scott Davis to purchase this product. Please add $5.00 for shipping/handling per order (US); for addresses outside the US, please add $10.00 for shipping and handling. Maryland orders please add 5% sales tax. Please be sure to include your call sign and e-mail address with your request so I can process your order promptly! Send to the address below: