Yaesu FT-710 Operation Manual page 103

• Setup the transceiver
The optional FC-40 Automatic Antenna Tuner pro-
vides automatic tuning of a coaxial line to present
nominal 50-ohm impedance to the FT-710's ANT
jack.
Before tuning can begin, the FT-710 must be con-
figured to recognize that the FC-40 is being used.
Configuration is done using the Setting Menu
Mode:
1. Press the [FUNC] knob.
2. Select [OPERATION SETTING] → [GENER-
AL] → [TUNER TYPE SELECT].
3. Rotate the [FUNC] knob, or touch "<" or ">"
on either side of the value to select "EXT".
4. Press the [FUNC] knob, or wait for about 3
seconds to save the setting.
5. Touch [BACK] several times to return to nor-
mal operation.
• Tuning Operation
1. Press the [TUNE] key.
A "TUNE" icon will appear in the display; and
the tuner function is activated.
2. Press and hold the [TUNE] key to begin auto-
matic tuning.
● The transmitter will be engaged, and the
"TUNER" icon will blink while tuning is in
progress.
● When the optimum tuning point has been
reached, the transceiver will return to re-
ceive, and the "TUNER" icon will again glow
steadily (instead of blinking).
• Be sure to connect a good earth ground to the
GND terminal of the FC-40.
• The carrier signal transmits continuously while
tuning is in progress. Please monitor the operat-
ing frequency before beginning the tuning pro-
cess. Be sure you are not interfering with others
who may already be using the frequency.
• It is normal to hear the sound of the relays while
tuning is in progress.
• If the impedance cannot be matched by the FC-
40 better than 2:1, and the "HI-SWR" icon blinks,
the microprocessor will not retain the tuning data
for that frequency, as the FC-40 presumes that
you will want to adjust or repair the antenna sys-
tem to correct the high SWR condition.
101