MFJ MFJ-5124K, MFJ-5124Y User Manual

Radio Interface

Model MFJ-5124K/Y

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

VERSION 0D

MFJ-5124K/Y Radio Interface Instruction Manual

Contents

Introduction.......................................................................................................... 1

Front Panel.................................................................................................... 1

To Tuner................................................................................................ 1

Power..................................................................................................... 1

To Radio................................................................................................ 1

Jumper Settings............................................................................................. 2

Kenwood Radio Interface.................................................................................... 3

Connections.................................................................................................. 3

Operation...................................................................................................... 4

Yaesu Radio TUNER Interface............................................................................5

Connections for FT-100................................................................................ 5

Operation for FT-100.................................................................................... 6

Connections for FT-857 or FT-897............................................................... 6

Operation for FT-857 or FT-897................................................................... 7

Yaesu Radio CAT Interface................................................................................. 8

Connections for FT-100................................................................................ 8

Connections for FT-857 or FT-897............................................................... 9

Connections for FT-847.............................................................................. 10

Operation for Yaesu CAT Interface............................................................ 10

Firmware Version Number................................................................................ 11

Technical Assistance.......................................................................................... 11

Connector Pinout ............................................................................................... 12

Schematic........................................................................................................... 13

MFJ-5124K/Y Radio Interface Instruction Manual

THIS PAGE IS LEFT BLANK INTENTIONALLY

MFJ-5124K/Y Radio Interface Instruction Manual

Introduction

The MFJ-5124 Radio Interface main unit contains all the electronics that allows users of AT-300 compatible Kenwood transceivers, FC-30 compatible Yaesu transceivers, and certain Yaesu transceivers with supported CAT system to connect to the MFJ-991, MFJ-993 and MFJ-994 IntelliTuner™ Automatic Antenna Tuners. With this interface, DC power to the radio interface and the tuner is supplied by the radio, except FT-847 CAT. Using the appropriate cable and selecting the interface protocol via internal jumpers allow one-button automatic tuning operation with various Kenwood and Yaesu transceivers.

Front Panel

TO TUN ER

POWER

MFJ-5124

TO RADIO

Radio Interface

• To Tuner: The 3.5 mm stereo phone plug connects to the tuner’s RADIO

INTERFACE jack, and the 2.1 × 5.5 mm coaxial plug connects to the tuner’s POWER jack.

• Power: Accepts a standard 2.1 × 5.5 mm coaxial plug with positive center

and negative sleeve. The tuner requires 12 volts DC at up to 1 amp. The use of a regulated supply is not mandatory but is recommended for best performance. An optional 12 volts DC 1.5 amp power supply, the MFJ1316, is available from MFJ Enterprises, Inc.

Most radios provide +13.8 volts through the radio’s tuner port (Kenwood AT/ACC or Yaesu CAT/LINEAR) to the TO RADIO jack, so the POWER jack connection is rarely used. If the radio’s tuner port does not have a power connection, such as the Yaesu FT-847 CAT connector, then connect a power supply to this connector. If the radio’s tuner port has a power connection but cannot supply one amp of current, then remove the internal jumper JP3 and connect a power supply to this connector. Check your radio’s operating manual.

WARNING: Do not apply voltages greater than 18 volts to this

unit, or permanent damage to the unit and the tuner may result.

• To Radio: Accepts an 8-pin modular plug that connects the radio interface

to a Kenwood AT/ACC or Yaesu CAT/LINEAR connector. Use proper cable for the various radios.

MFJ-5124K/Y Radio Interface Instruction Manual

Jumper Settings

Two jumpers, JP1 and JP2, inside the MFJ-5124 are used to select the radio to interface with. To change these jumper settings:

1. Disconnect the MFJ-5124 from the radio and the tuner.

2. Open the MFJ-5124 case by removing the two screws on the bottom.

3. Configure jumpers JP1 and JP2 according to the following table to select the radio to interface with.

JP1 JP2 To Interface Using

†

A A

A B

Kenwood (auto detected tuner) such as TS-570S, etc. Kenwood (menu enabled tuner) such as TS-450S, TS-690S, etc.

MFJ-5124K

(6-pin molex)

MFJ-5124K

(6-pin molex)

A C Firmware Version Number N/A

B A

Yaesu TUNER interface FT-100, FT-857, FT-897

‡

MFJ-5124Y

(8-pin mini DIN)

B B Reserved for future use. N/A

B C Reserved for future use. N/A

C A

C B

C C

Yaesu CAT interface FT-100 Yaesu CAT interface FT-857, FT-897 Yaesu CAT interface § FT-847

MFJ-5124Y

(8-pin mini DIN)

MFJ-5124Y

(8-pin mini DIN)

MFJ-5124Y2

(DB-9)

† MFJ-5124K factory default.

‡ MFJ-5124Y factory default.

§ MFJ-5124Y2 factory default.

4. Close the MFJ-5124 case and secure with the two screws.

5. Refer to the appropriate section in this manual to connect t he M FJ-5124 to the radio and the tuner.

Note: The Yaesu TUNER interface allows the use of the radio’s (TUNE)

key to initiate automatic tuning, whereas the Yaesu CAT interface uses the tuner’s [TUNE] button to start automatic tuning.

+ 14 hidden pages