MFJ MFJ-1270C - Page 2

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MFJ ENTERPRISES, INC.

Model MFJ-1270C/1274C

Packet Radio Controller

Revision 10

SYSTEM MANUAL

Fourth Edition

Main Page

Table of Contents4
Introduction10
- Items Supplied with MFJ TNC Package11
- Optional Items Available for the MFJ TNC12
Computer Interfacing13
- MFJ Terminal Software Starter Packs13
  - Computer Interfacing with MFJ Starter Packs14
  - Computer Interface Without MFJ Starter Pack14
- Serial Port Signals14
  - Computers with Specific Serial Interfaces16
  - Other Computers with Non-Standard Serial Ports21
- Terminal Software Requirements21
- MFJ TNC Serial Port Pin Functions24
- Computer Baud Rate25
- Verifying Serial Port Operation26
Radio Interfacing29
- MFJ TNC Radio Port29
  - Radio Port Connection30
  - Handheld Radio Connection30
- Radio Interfacing Methods32
Getting Started39
- First Steps39
  - Basic Parameters Setup40
- Serial Port Configuration40
- Tuning Indicator (MFJ-1274C)43
- Packet Operation43
- Fax Operation56
  - Fax Frequency57
    - Fax Station Frequencies58
    - Other FAX Frequencies58
Advanced Packet Operation59
- Special Characters59
Packet Operating Modes61
- Command Mode61
- Flow Control66
- Detail VHF Packet Operation69
- Monitor Functions76
- Real-Time Clock and Time Stamping79
- Multi-Connect Guide79
  - Setting the MFJ TNC to Normal Operation79
  - How to Invoke Multi-Connect80
- Easy-Mail Mailbox81
  - Set up Your Easy-Mail Mailbox81
  - Mailbox Operation87
- Mailbox Messages95
Slotting and Acknowledgment Priority97
- Description98
- Packet Picture Transfer105
  - Receiving Packet Pictures on Printer105
  - Packet Picture Transfer to the Computer Screen106
- Detail HF Packet Operation106
  - Radio Setup for HF Packet Operation106
- HF Packet Operation110
- Mfj Tnc Kiss Mode and Host Mode117
  - KISS Interface for TCP/IP118
Operation Commands119
- Command Name120
Command Mode Error Messages207
- Link Status Messages209
Hardware213
- General Description214
- Jumper Functions220
- HF Tuning Indicator225
Troubleshooting227
- Symptom: TNC Appears Dead228
- Symptom: Modem Won't Calibrate or Key Transmitter229
Terminal Interface Troubleshooting230
- Symptom: the MFJ-TNC Signs on OK but Won't Accept Commands231
- Symptom: the MFJ-TNC Appears to Have "Locked-Up" I.e. Not232
- Responding to any Commands232
Packet Radio Protocol233
- Explanation of Protocol233
- AX.25 Level Two235
Channel Use and Timing Functions238
Channel Flow Control240
Radio Hookup242
Modem Calibration243
- Modulator and Demodulator Frequency Calibration243
- MFJ-TNC Adjustment Location Map248
- Audio Output Calibration250
- Audio Output Level Adjustment Procedure250
Hf Radio Alignment252
- First Method: NOISE AVERAGE FREQUENCY252
- Second Method: FILTER SKIRT AVERAGE FREQUENCY252
Mfj-Tnc 2400 Packet Operation254
- 2400 Packet Operation Setup254
  - Receive Audio Setting254
  - Transmit Audio Setting255
Jumper Functions and Locations256
Command Summary259

MFJ MFJ-1270C - Page 2

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