MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner
Instruction Manual
2006-2015 MFJ Enterprises, Inc.
13
MFJ-939Y Yaesu
Yaesu FT-100, FT-450, FT-847, FT-857, FT-897, FT-950
Operation for FT-100
The operation of the MFJ-939Y radio interface is similar to the operation of the FC-20 described in the
Yaesu radio 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-5114Y Yaesu radio interface.
Operation for FT-450
The operation of the MFJ-5114Y radio interface is similar to the operation of the FC-30/-40 described in
the Yaesu radio operating manual.
1.
Press the (TUNE) button on the radio briefly to enable the external tuner function. The “TUNER”
icon will appear in the radio’s display. If the radio frequency is out of the amateur band, the
“TUNER” icon will not appear.
2.
Press and hold the (TUNE) button on the radio for one second to begin automatic tuning. The
radio will automatically transmit a low-power carrier and start the tuning process. The “TUNER”
icon will blink while tuning is in progress. Press and hold the (TUNE) button on the radio for one
second while tuning is in progress to cancel the automatic tuning.
3.
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-5114Y Yaesu radio interface.
Operation for FT-857 or FT-897
The operation of the MFJ-5114Y radio interface is similar to the operation of the FC-30 described in the
Yaesu radio operating manual.
1.
Press the [FUNC] or [F] key, then rotate the [SELECT] or [MEM/VFO CH] knob to recall Multi
Function Row “k” [TUNE, DOWN, UP].
2.
Press the [A](TUNE) key on the radio to turn the external tuner function on; the “TUNE” or
“TUNR” icon will appear in the radio’s display.
3.
Press and hold the [A](TUNE) key on the radio to begin automatic tuning. The radio will
automatically transmit a low-power carrier and start the tuning process. Press the [A](TUNE) 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-5114Y Yaesu radio interface.
