Yaesu FT-991A, Руководство по эксплуатации

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Page 145 FT- 991 Operating Manual
Installation of Optional Accessories
AT
AS-120A
Dedicated V/UHF band antenna
Commercial
antenna
duplexer
Commercial
antenna base
AT
AS-120A
ATAS-120A connection example
FT-991A
FT-991A
Active-Tuning Antenna System
(
ATAS-120A
)
Operation
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-991A . Please
refer to the ATAS-120A Operating Manual for the assembly and installation of ATAS-120A .
Interconnections to FT-991A
Connect “ ATAS-120A ” to the ANT terminal of FT-991A with a coaxial cable as shown in the diagram below.
Advice:

Turn off the external power supply switch and
the FT-991A power supply switch first before
connecting the cables.

Grounding is required for the ATAS-120A . Make
sure the antenna base is in contact with the car body
to ensure proper grounding.
Note:

Do not plug or unplug the connector 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.

The unit cannot be used with both the antenna tuner
and ATAS-120A connected.
When using an antenna duplexer, the ANT terminal of
the ATAS-120A and the HF/50 MHz ANT terminal
of the FT-991A must be connected in series and also
insulated from the grounding in order to supply the
control voltage for the ATAS-120A .
When installing a dedicated VHF/UHF antenna si-
multaneously with the ATAS-120A , use a VHF/UHF
antenna that does not include the HF - 50 MHz bands
(144/430 MHz type).
The reception circuit of the V/UHF band may be im-
pacted by the transmitter energy from the ATAS-120A .
In addition, install the 2 antennas as far away from each
other as possible.