MFJ-993B IntelliTuner Automatic Antenna Tuner
Instruction Manual
2005-2012 MFJ Enterprises, Inc.
35
Yaesu Radio Interface/MFJ-5124Y
The MFJ-5124Y radio interface allows users of FC-30 compatible Yaesu transceivers to connect to the
MFJ-993B
IntelliTuner™
Automatic Antenna Tuners. With this interface, power 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 tuner.
Connections for FT-100
1.
Before connecting the MFJ-5124Y to your radio, follow the instructions in the radio’s manual for
installing the FC-20 automatic antenna tuner.
a.
Press and hold 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 and then power on the radio.
Operation for FT-100
The operation of the MFJ-5124Y radio interface is similar to the operation of the FC-20 described in the
Yaesu radio’s operating manual.
1.
Press the [FUNC] key, as needed, to recall Operating Function Row 7 [MTR, TUN, PRO, VOX].
2.
Press the [B](TUN) key on the radio for ½ second to turn the external tuner function on; the
“TUN” icon will appear bolded in the radio’s display.
3.
Press and hold the [B](TUN) key on the radio to begin automatic tuning. The radio will
automatically transmit a low-power carrier and start the tuning process. Press the [B](TUN) key
again to cancel tuning in progress. When tuning is completed, the radio will stop transmitting and
you will be ready for operation on this frequency.
Note the [TUNE] button on the tuner will not operate the MFJ-5124Y Yaesu radio interface.
