Functions:
Frequency range from 23.355MHz to 28.465MHz in Low Band
Frequency range from 26.055MHz to 31.165MHz in High Band
5kHz and 10kHz Frequency Step
Step Up and Step Down
Scan Up and Scan Down
Dual Watch
Repeater function (Split)
2 Memory Bank with 100 memories
System Requirements:
IBM PC compatible
Windows 16/32 bit and Windows NT operating system
1 MB of RAM, 1 MB of free disk space
CX4400 Software
Connex CX-4400 CB-Radio
Price:
Few component`s
1 pcs. 25-Pin D-SUB Connector
1 pcs. NULL-Modem Cable
The connection to Printer port.
Install a 25-pin D-SUB Male connector on the radio`s bottom cover, and use
a NullModem cable to the computer`s printer port.
See Radio interfacing to Printer Port for more
information about using PrinterPort.
| Pin | PrinterPort | Direction | Usage | Connection to: | Active H/L |
|---|---|---|---|---|---|
| 1 | Data 8 | Out to radio | MC145106 pin 9 | HIGH | |
| 2 | Data 0 | Out to radio | MC145106 pin 17 | HIGH | |
| 3 | Data 1 | Out to radio | MC145106 pin 16 | HIGH | |
| 4 | Data 2 | Out to radio | MC145106 pin 15 | HIGH | |
| 5 | Data 3 | Out to radio | MC145106 pin 14 | HIGH | |
| 6 | Data 4 | Out to radio | MC145106 pin 13 | HIGH | |
| 7 | Data 5 | Out to radio | MC145106 pin 12 | HIGH | |
| 8 | Data 6 | Out to radio | MC145106 pin 11 | HIGH | |
| 9 | Data 7 | Out to radio | MC145106 pin 10 | HIGH | |
| 10 | ACK | In from radio | PTT Switch | Microphone connector Pin 3 | LOW |
| 11 | Busy | In from radio | Squelch Control | Squelch sircuit, IC1 pin 8 | LOW |
| 14 | Strobe | Out to radio | Frequency select | MC145106 pin 6 | 10kHz = Low and 5kHz = High |
| 18 | Ground | Ground | MC145106 pin 18 |
| Before modification | After modification |
|---|---|
 To protect the PrinterPort: Cut the trace between IC3 and IC4/IC5.... |
 and insert 8 pcs. 4,7kW resistors across the cutted traces. If pin 9 is connected, cut the trace and insert 4,7kW resistors across. |
| Connection to the PrinterPort | Squelch and PTT circuit |
|---|---|
 |
Connect a 4,7kW resistor to the SQ-circuit. Use also a 1N4148 or similar diode to protect the input fron the PTT-Switch. Connect a wire from PrinterPort pin 14 to MC145106 pin 6 to obtain 5kHz and 10kHz frequency Step. |
Software: