MFJ MFJ-5124K Instruction Manual download pdf (Page 13)

MFJ-993B IntelliTuner Automatic Antenna Tuner Instruction Manual

Back Panel

RADIO

INTERFACE

POWER

12VDC

REMOTE

PORT

ANTENNA 1 ANTENNA 2

TRANSMITTER

BALANCED LINE

GROUND

WIRE

MFJ ENTERPRISES, INC.

STARKVILLE, MS USA

Do not connect WIRE and

ANTENNA 1 at same time!

Install Jumper When Using

BALANCED LINE Antenna

Figure 4. MFJ-993B Back Panel.

• Power: This jack 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 MFJ-1316, is available from MFJ Enterprises, Inc.

WARNING: Do not apply voltages greater than 18 volts to this unit, or permanent damage

to the unit may result.

Note: When the tuner power is OFF, the tuner is in bypass mode and RF from the transmitter

goes directly to the antenna (ANTENNA 1) with no matching.

• Remote Port: A female DB-9 connector for connecting to the MFJ-993RC Remote Control,

allowing remote operation of the tuner. The MFJ-993RC duplicates all the front panel buttons except

[POWER] and [MODE]. In addition, there are two LEDs on the remote control. The red Tuning

LED lights to indicate tuning is in progress and the green SWR LED lights when the SWR is below

the target SWR.

Note: To use the remote control, both the [ANT] and [AUTO] buttons on the automatic tuner

must be pressed in; otherwise, Antenna 1 and Automatic mode are selected.

• Radio Interface: A 3.5 mm stereo phone jack for connecting to the tuner interface connector of

compatible radios. Most radios provide +13.8 VDC power thought its tuner interface connector. If

separate power supplies are used to power the MFJ-993B, the MFJ-993B should be powered on first

(for certain radios,

TURN ON RADIO will display and both needles will bounce) and then turn on

the radio, so the radio knows an external tuner is attached. The radio will disable its internal tuner, if

it has one, and use the external tuner.

The Radio Interface works with radios that are compatible with Alinco EDX-2, Icom AH-3 and AH-

4, Kenwood AT-300, Yaesu FC-30, and certain Yaesu radios with CAT system. When connected to

a compatible radio, simply press the [TUNER] or [AT] button on the radio; for certain Yaesu, press

the [TUNE] button on the tuner to start the automatic tuning process. The radio will automatically

switch to CW mode (AM for Yaesu), transmit a 10-watt carrier, and start the tuning process. Once

the automatic tuning is completed, the radio will return to its previous mode and power setting.

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MFJ MFJ-5124K Instruction Manual Page 13

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