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Yaesu Atas-120A Manual

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Yaesu Atas-120A Installation Instructions

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Yaesu FT 857 and ATAS 120 Mobile Set up


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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 is element for lowest SWR without the need for expensive, inconvenient monoband resonating whip assemblies. The 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 years of enjoyable mobile operation with the Active Tuning Antenna System. We hope and trust that you will enjoy many !


Element Inset the top whip element Insert element through the hole in the wathrough hole in Waterproof cap terproof cap. Insert the whip element into Waterproof Cap (supplied) the Antenna Coil assembly. Slide the waterproof cap down the element and on to the Antenna Coil assembly. Press the waterproof cap snugly on top of the Antenna Allen wrench Coil assembly, ensuring an (supplied) Antenna coil accurate fit to the contours of assembly Tighten Allen screw the assembly. to secure element Refer to the manufacturers instructions, and install the mounting base assembly in a location 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. Connect the coaxial cable from the mounting base to the transceivers HF antenna jack. Refer to the transceivers operating manual, and set the transceivers 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 Duplexer (for the FT-857, FT-897 and FT-100/-100D) or Triplexer (for the FT-847) device to connect to the appropriate transceivers 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 appropriate antenna jack when you wish to operate on VHF or UHF.


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 grounding purposes). Suitable mounts include the Diamond models TE5M and K400. In the interest of operator safety, always use the minimum transmitter power necessary to establish and maintain communications while operating mobile, and restrict transmitter operation when pedestrians are within one meter (3.3 feet) of the radiating element. Do not allow anyone to touch the radiating element during a transmitting session, due to the danger of burning of the skin caused by the high RF voltage present. in a position where the Do not install the radiating element could come in contact with (A) any electrical wiring, which could cause lethal shock, or (B) a grounded metal surface, as this will disrupt communications 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 driving a vehicle. from the vehicle when washDisconnect the 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 holding power to secure the reliably, and are not recommended. is designed specifically for use with The Yaesu transceivers equipped for the ATAS system, and is not capable of automatic operation with other transceiver models. For base station operation, if you do not have a good counterpoise system such as a townhouse balcony, VHF/UHF performance can be enhanced by the installation of the Antenna Base Kit. optional 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.


See the Operation section of the transceivers operating tuning and operation. manual for details of
4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan


US Headquarters 10900 Walker Street, Cypress, CA 90630, U.S.A.


P.O. Box 75525, 1118 ZN Schiphol, The Netherlands


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.) 50 INPUT IMPEDANCE: MAX. INPUT POWER: 120 Watts (A3J) MATCHED SWR: Less than 2.0:1 (with proper counterpoise) (Specifications subject to change without notice or obligation)


Unit 12, Sun Valley Business Park, Winnall Close Winchester, Hampshire, SO23 0LB, U.K.


Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road, Kwun Tong, Kowloon, Hong Kong
Normanby Business Park, Unit 14/45 Normanby Road Notting Hill 3168, Victoria, Australia



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