ACTIVE TUNING ANTENNA SYSTEM
ATAS-120A
INSTALLATION/OPERATING INSTRUCTIONS
The is a unique mobile antenna designed for use with Yaesu the transceivers equipped for the ATAS system, such as the
FT-897, FT-847, FT-857 and FT-100/-100D. The utilizes a motorized tuning system which resonates the radiating
element for lowest SWR without the need for expensive, inconvenient monoband resonating whip assemblies. The is
designed to mount directly onto a standard mobile antenna mount (not supplied) which is compatible with its Type “M” (“m/m pitch
only”) base connector. Your Dealer will be pleased to help you select the ideal mobile mounting assembly for your vehicle.
Thank you for choosing exciting new Active Tuning Antenna System. We hope and trust that you will enjoy many
years of enjoyable mobile operation with the !
INSTALLATION
cInset the top whip element
through the hole in the wa-
terproof cap.
dInsert the whip element into
the Antenna Coil assembly.
eSlide the waterproof cap
down the element and on to
the Antenna Coil assembly.
fPress the waterproof cap
snugly on top of the Antenna
Coil assembly, ensuring an
accurate fit to the contours of
the assembly.
gRefer to the manufacturer’s
instructions, and install the mounting base assembly in a loca-
tion where a solid, secure ground connection to the car body
can be obtained.
Note: Installation of the on a hatchback or trunk
lid may not permit a low SWR to be obtained. A solid bond to
the car body is important so as to establish a counterpoise
for the vertical radiating element.
hConnect the coaxial cable from the mounting base to the
transceiver’s HF antenna jack.
iRefer to the transceiver’s operating manual, and set the
transceiver’s Menu selections associated with the ATAS
system.
For operation on the 144 and 430 MHz bands, in addition to
HF/50 MHz, you may wish to consider the purchase of a “Du-
plexer” (for the FT-857, FT-897 and FT-100/-100D) or
“Triplexer” (for the FT-847) device to connect to the appro-
priate transceiver’s antenna jacks; the Duplexer or Triplexer
will then automatically pass RF power from the band in use
while isolating the other two antenna jacks. If you do not have
a Diplexer or Triplexer, the coaxial cable connector from the
will have to be moved manually to the appropri-
ate antenna jack when you wish to operate on VHF or UHF.
OPERATION
See the “Operation” section of the transceiver’s operating
manual for details of tuning and operation.
CAUTIONS
For mounting onto a trunk lid or hatchback of a vehicle,
utilize a mount which provides secure, strong mechanical
contact to the vehicle's frame (to support the antenna's
cross-sectional area while driving, as well as for ground-
ing purposes). Suitable mounts include the Diamond mod-
els TE5M and K400.
In the interest of operator safety, always use the minimum
transmitter power necessary to establish and maintain com-
munications while operating mobile, and restrict trans-
mitter operation when pedestrians are within one meter
(3.3 feet) of the radiating element.
Do not allow anyone to touch the radiating element dur-
ing a transmitting session, due to the danger of burning of
the skin caused by the high RF voltage present.
Do not install the in a position where the
radiating element could come in contact with (A) any elec-
trical wiring, which could cause lethal shock, or (B) a
grounded metal surface, as this will disrupt communica-
tions and may cause arcing.
Do not touch the Antenna Coil Assembly of the
, so as to avoid undue stress to it or the mechanical
components within it.
Do not attempt to perform the tuning process while driv-
ing a vehicle.
Disconnect the from the vehicle when wash-
ing your vehicle to prevent ingress of water into the
due to the high water pressure, or damage from the
brushes.
Because of the cross-sectional area of the ,
simple magnetic mounts will not provide sufficient hold-
ing power to secure the reliably, and are not
recommended.
The is designed specifically for use with
Yaesu transceivers equipped for the “ATAS” system, and
is not capable of automatic operation with other trans-
ceiver models.
For base station operation, if you do not have a good coun-
terpoise system such as a townhouse balcony, VHF/UHF
performance can be enhanced by the installation of the
optional Antenna Base Kit.
There are no user-serviceable parts inside this antenna.
Reckless turning of the top of the antenna coil may result
in breakage of the antenna coil wire and/or other internal
damage.
SPECIFICATIONS
FREQUENCY RANGE:
7
/14/21/28/50/144/430 MHz
Amateur Bands
HEIGHT (Approx.): 1.4 ~ 1.6 meters (4.59 ~ 5.24 feet)
WEIGHT (Approx.): 900 g (1.98 lbs.)
INPUT IMPEDANCE:50Ω
MAX. INPUT POWER: 120 Watts (A3J)
MATCHED SWR: Less than 2.0:1
(with proper counterpoise)
(Specifications subject to change without notice or obligation)
Element
Insert element
through hole in
Waterproof cap
Waterproof Cap
(supplied)
Antenna coil
assembly Tighten Allen screw
to secure element
Allen wrench
(supplied)
VERTEX STANDARD CO., LTD.
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan
VERTEX STANDARD
US Headquarters
10900 Walker Street, Cypress, CA 90630, U.S.A.
YAESU EUROPE B.V.
P.O. Box 75525, 1118 ZN Schiphol, The Netherlands
YAESU UK LTD.
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
VERTEX STANDARD HK LTD.
Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road,
Kwun Tong, Kowloon, Hong Kong
VERTEX STANDARD (AUSTRALIA)PTY., LTD.
Normanby Business Park, Unit 14/45 Normanby Road
Notting Hill 3168, Victoria, Australia
EAC81X701
