Active-Tuning Antenna System (Atas-120A) - Yaesu FT-710 Operation Manual

Active-Tuning Antenna System (ATAS-120A)

ATAS-120A is a multi-band auto-tuning antenna that can be used in the amateur bands from the HF band
to the UHF band (7/14/21/28(29) /50/144/430). Using the active tuning mechanism, tuning can be carried
out automatically by the control signal from FT-710. Please refer to the ATAS-120A Operating Manual for
the assembly and installation of ATAS-120A.
Depending on the installation and location of some antennas, it may not be possible to tune to a low SWR.
• Interconnections to FT-710
Connect "ATAS-120A" to the ANT terminal of the
FT-710 with a coaxial cable as shown in the dia-
gram below.
• Turn off the external power supply
switch and the FT-710 power sup-
ply switch first before connecting
the cables.
• Do not plug or unplug the connec-
tor of the antenna cable with wet
hands. Do not plug or unplug the
connector during transmission as
well. This may result in electric
shock, injury, etc.
• Grounding is required for the ATAS-
120A. Make sure the antenna base
is in contact with the car body to
ensure proper grounding.
Commercial
Antenna base
• Setup the transceiver
Before tuning can begin, the FT-710 must be con-
figured to recognize that the ATAS-120A 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 "ATAS".
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.
The "ATAS" icon will appear in the display.
102
• Tuning Operation
The tuning of the ATAS-120A is carried out auto-
matically.
When using the ATAS-120A for the first time or
when tuning for the first time after resetting the FT-
710, tuning is not performed for about 1 minute until
the FT-710 recognizes the ATAS-120A even if the
[TUNE] key is pressed.
Tuning is performed after recognizing the ATAS-
120A.
Press the [TUNE] key to begin automatic tuning.
● The transmitter will be engaged, and the "ATAS"
icon will blink while tuning is in progress.
● When the optimum tuning point has been
reached, the transceiver will return to receive,
and the "ATAS" icon will again glow steadily (in-
stead of blinking).
• 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.
• Check the grounding and installation conditions
if "HI-SWR" icon blinks (tuning cannot be carried
out).
• Manual Tuning
The tuning of the ATAS-120A may be carried out
manually.
Press the PTT switch on the microphone to trans-
mit and then press the UP/DWN button on the
microphone to adjust the antenna until the meter
indicates the minimum SWR.
The meter on the screen will automatically
change to the SWR meter.