XT-4 MK2 CW Memory Keyer User’s Manual
Revision 1.00
For software version 1.00
September 2023
Specifications
Battery: 9 volt alkaline
CW speed: Approximately 8-45 WPM
Memories: 4, approximately 240 Morse characters each
Output keying: Positive Keying only, RCA phono jack output
Paddle input: 1/8’ (3.5mm) stereo jack input
Note: The four XT-4 message areas have test messages programmed in. Verify they play back before attempting to program new
messages!
Set UP
1)
Wire up your paddle with shielded cable with two conductors. The XT-4 uses a 1/8” stereo phono plug. The shield wire is ground.
The tip of the connector is for the dit key, and the center ring is for the dah key.
The standard is for the paddle that does the dits is controlled by the thumb, and the dahs by the forefinger paddle. If you learned
another way, wire it up so you are comfortable keying. Other users can swap the paddles as a programmable option.
2)
Wire up a cable to the CW input of your transmitter. Use shielded cable with an RCA phono type connector for the XT-4 end and a
connector compatible with your transmitter on the other end.
3)
Install a standard 9V alkaline battery in the battery compartment.
Note: The XT-4 is designed to work with solid state positive keyed radios only.
Damage can occur to the XT-4 and/or your transmitter if it is used improperly!
If you are unsure of your transmitter type, plug the CW cable into the transmitter but leave the other end free. Measure the voltage
across the other end of the cable. Ground is the outer shell, and the inner pin is positive. The voltage should m5V to +12V. Do
not use the XT-4 keyer with your radio if the voltage is negative or is more than 24V.
ON/OFF/Speed Control
The speed control knob is a combined ON/OFF switch and speed control. Turn the knob fully counterclockwise to turn the unit off
when not in use. This will preserve battery life.
Turning the knob clockwise will increase the CW sending speed. The speed ranges from about 8 WPM to 45 WPM.
Power Saving Sleep Mode
The XT-4 has a power save mode to conserve battery power if you forget to turn the power off. The XT-4 goes into power save after
about 10 minutes of inactivity. Pressing either key of the paddle brings the XT-4 back to normal operation. Note that the XT-4 will not
respond to button presses while in sleep mode.
Microsystems
UM
Unified
