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Yaesu (UK) Ltd  
ATAS-120A Active Tuning Antenna System (Automatic)
Yaesu's patented ATAS™ (Active Tuning Antenna System) makes the ATAS-120A a unique mobile antenna designed for use with Yaesu's transceivers, such as the FT-897, FT-857, FT-847, FT-100/100D and the FT-450.

It provides 7/14/21/28/50 Mhz bands coverage with automatic motorised tuning

Note: The ATAS-120A is designed specifically for use with Yaesu transceivers equipped for the "ATAS" system, and is NOT capable of automatic operation with other transceiver models.

The ATAS-120A utilises a motorised tuning system which resonates the radiating element for lowest SWR without the need for expensive, inconvenient monoband resonating whip assemblies.

This amazing antenna is designed to mount directly onto a standard mobile antenna mount (not supplied) which is compatible with its Type M (SO-239) base connector.

Using control signals from the transceiver's microprocessor received via the coaxial cable, the ATAS internal motor adjusts the radiator length for the best SWR.

 For base operation (i.e. balcony), VHF/UHF performance can be enhanced by the installation of the optional ATBK-100 Antenna Base Kit.

Comes with a waterproof cap for ease of mind in our British weather...
Specifications ATAS-120A
Frequency Range 7/14/21/28/50/144/430MHz Amateur Bands
Input Impedance 50 Ω
Max Input Power 120W 7/14/21MHz (SSB, CW; 50% duty cycle)
100W 28MHz, 50MHz, (FM & RTTY)
50W 144/430MHz, (SSB, CW, FM, RTTY)

Matched SWR Less than 2.0:1
Height (approx) 1.4 to 1.6m, depending on frequency selected
Weight (approx, g) 900
  • ATAS-120A Antenna System
  • Weatherproof Cap
  • Hex Key (Allen Wrench)
  • Installation/Operating Instructions
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