MFJ -1270X Instruction Manual
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MFJ -1270X Instruction Manual

Tnc-x packet controller
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TNC-X Packet Controller
Model MFJ-1270X
INSTRUCTION MANUAL
CAUTION: Read All Instructions Before Operating Equipment !
MFJ ENTERPRISES, INC.
300 Industrial Park Road
Starkville, MS 39759 USA
Tel: 662-323-5869 Fax: 662-323-6551
V E RS ION 2A
COP Y RI GHT
2013 M F J E NT E RP RI S E S , I NC.

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Summary of Contents for MFJ MFJ-1270X

  • Page 1 TNC-X Packet Controller Model MFJ-1270X INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment ! MFJ ENTERPRISES, INC. 300 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-5869 Fax: 662-323-6551 V E RS ION 2A COP Y RI GHT 2013 M F J E NT E RP RI S E S , I NC.
  • Page 2 Customers using this manual should report errors or omissions, recommendations for improvements, or other comments to MFJ Enterprises, 300 Industrial Park Road, Starkville, MS 39759. Phone: (662) 323-5869; FAX: (662) 323-6551. Business hours: M-F 8-4:30 CST.

  • Page 3: Table Of Contents

    MFJ-1270X Instruction Manual TNC-X Packet Contoller Introduction....................4 Power Requirements .................5 Terminal Speed..................5 Setup If You Are Using USB..............5 Setup If You Are Using the TNC’s Serial Port ........6 Back Connections..................6 Radio Setup....................7 Radio Port Connections......Error! Bookmark not defined. Cables ....................8 Radio Connection ..................8...

  • Page 4: Introduction

    TNC was designed to be small, inexpensive, have low power consumption, and expandable. The MFJ-1270X features an on- board USB port. The USB port was added because the design took into consideration that computers these days lack the old style RS-232 serial ports. There is also an 8-pin expansion header that allows the addition of "daughter boards".

  • Page 5: Power Requirements

    IMPORTANT: DO NOT PLUG IN THE 8-15 VDC POWER SUPPLY AND THE 9-VOLT BATTERY AT THE SAME TIME The power requirements of the MFJ-1270X are very minimal due to the low power consumption of the design. Using an 8-15 volt DC power supply capable of 200-300 mA is well within the consumption specifications.

  • Page 6: Setup If You Are Using The Tnc's Serial Port

    MFJ-1270X Instruction Manual TNC-X Packet Contoller If you use the USB port, do not supply any power to the TNC through the power jack.. The USB buss can supply the rather limited power requirements for the TNC. If you are using the USB option, set the board jumpers as follows: JP3 On the left two pins (toward C24).

  • Page 7: Radio Setup

    Power 12VDC A coaxial power jack for main power input. Center pin is positive and sleeve is negative. RADIO A 5-pin DIN connector used to interface the radio to the TNC. POWER: Indicates the MFJ-1270X has power supply voltage supplied. RECEIVE DCD: Indicates the MFJ-1270X is receiving a data packet signal from the radio.

  • Page 8: Cables

    Radio Connection When using the pre-made cable for your radio, plug the cable into the 5 pin DIN connector on the MFJ-1270X and into the proper connector on the radio. Depending on the cable it might be the microphone and speaker connectors or the audio accessory connector.

  • Page 9: Setup And Troubleshooting

    MFJ-1270X Instruction Manual TNC-X Packet Contoller making your own adapter cable to connect to the audio in, audio out, and PTT lines of the radio you have. Refer to the operators manual or service manual of the radio for the correct connections.

  • Page 10: 1270X Seems To Receive But The Computer Is Not Displaying The Received Data Or Is Not Making The Tnc To Transmit

    MFJ-1270X Instruction Manual TNC-X Packet Contoller 2. Check the interface cable to make sure the transmit audio line has continuity and is connected to the correct point on the transmitter to transmit the audio. 3. Check the transmit modulation level. The deviation of an FM transmitter should be around 3-4KHz.

  • Page 11: Additional Troubleshooting

    MFJ-1270X Instruction Manual TNC-X Packet Contoller 2. Check the jumpers to make sure the baud rate is set correctly for the program that is in use. The baud rate jumpers set the rate between the computer and the 1270X not the baud rate to the RF link.

  • Page 12: Voltage Supply

    MFJ-1270X Instruction Manual TNC-X Packet Contoller The MFJ-1270X is designed to give years of service. However, as with all things sometimes problems do come up and need to be taken care of. Here are a few troubleshooting tips in the event that something does go wrong.

  • Page 13: Tnc Programs

    Call the MFJ Service Dept. for a replacement part. TNC Programs There are a number of programs available for use with the MFJ-1270X. This list is not a complete list and is not an endorsement for any particular program on the list. Support for these programs is supplied by the software author, not MFJ Enterprises, Inc.
  • Page 14 MFJ-1270X Instruction Manual TNC-X Packet Contoller Figure 1: MFJ-1270X Parts Layout...
  • Page 15 If you have any problem with this unit first check the appropriate section of this manual. If the manual does not reference your problem or your problem is not solved by reading the manual you may call MFJ Technical Service at 662-323-0549 or the MFJ Factory at 662-323-5869. You will...
  • Page 16 MFJ Enterprises, Inc. at the time of warranty service. MFJ Enterprises, Inc. shall have the discretion to deny warranty without dated proof-of-purchase. Any evidence of alteration, erasure, of forgery shall be cause to void any and all warranty terms immediately.

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