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FT-891 Advance Manual
Auto 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-891. Please refer to the ATAS-120A Operating Manual for the assembly
and installation of ATAS-120A.
Interconnections to FT-891
Connect “ATAS-120A” to the ANT terminal of FT-891 with a coaxial cable as shown in the
diagram below.
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Turn off the external power supply switch and the FT-891 power supply switch first
before connecting the cables.
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Grounding is required for the ATAS-120A. Make sure the
antenna base is in contact with the car body to ensure proper
grounding.
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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.
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The unit cannot be used with both the antenna tuner and ATAS-
120A connected.
FT-891
AT
AS-120A