MFJ-5124K/Y Radio Interface Instruction Manual
© 2005-2010 MFJ Enterprises, Inc. 5
Yaesu Radio TUNER Interface
The MFJ-5124Y radio interface allows users of Yaesu FT-100, FT-450, FT-857,
FT-897, FT-950, and FC-30 compatible Yaesu transceivers to connect to the
MFJ-991, MFJ-993 and MFJ-994 IntelliTuner™ Automatic Antenna Tuners.
With this interface, DC power is supplied by the radio and control signals are
connected between the radio and the tuner. The operator can then control the
tuner with a single push of the (TUNE) key on the front panel of the radio.
Supported Yaesu radios are FT-100, FT-450, FT-857, FT-897, FT-950, and any
Yaesu radio that supports the Yaesu FC-30.
Connections for FT-100
1. Before connecting the MFJ-5124 to your radio, follow the instructions
in the radio’s manual for installing the FC-20 automatic antenna tuner.
a. Press and hold in the [FUNC] key for ½ second to activate the
Menu mode.
b. Rotate the [SELECT] knob to recall Menu #61 [TUNER/ATAS],
and then rotate the Main Dial to change the setting to “tunEr.”
c. Press the [FUNC] key momentarily to save the new setting and
exit to normal operation.
d. Turn the FT-100’s power off, then on again, to re-initialize the
radio regarding the tuner status.
2. Turn the radio off.
3. Insert the 3.5 mm stereo phone plug into the tuner’s RADIO
INTERFACE jack.
4. Insert the 2.1 x 5.5 mm coaxial power plug into the tuner’s POWER
jack.
5. Insert the 8-pin modular plug into the MFJ-5124’s TO RADIO jack.
6. Important
: Make sure the DC power to the radio has been turned off.
The radio does not fuse the DC power to the tuner, and damage to the
radio can occur if the interface’s power connection comes in contact
with ground.
7. Connect the 8-pin mini DIN connector to the mating 8-pin mini DIN
connector at the end of the BAND DATA cable pigtail on the back of
the radio.
8. Push the [POWER] button on the tuner to the in position. When the
radio is turned on, the tuner will also power on.
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