Yaesu ATAS-120A Auto Active Tuning Antennas

Yaesu’s patented ATAS™ Active Tuning Antenna System has been enhanced with the latest model: ATAS-120A. This is a unique mobile antenna that provides HF, VHF and UHF coverage with automatic motorized tuning.

Designed for use exclusively with Yaesu transceivers that support ATAS, microprocessor controlled voltages are sent on the coaxial cable to adjust the antenna radiator length for best SWR.

Yaesu ATAS-120A active tuning antennas cover the 7, 14, 21, 27, 28, 50, 144 and 430MHz bands and are compatible with the Yaesu FT891, FTDX-10, FT-710, FT-991A, FT-991, FT-857D, FT-897D, FT-100, FT-100D and the FT-450D.

They are typically attached to a vehicle hatch or boot lip with a SO239 base and mount Like the Diamond K-400 (not supplied). The ATAS-120A antennas were designed for mobile use, however they can be adapted for base, or portable operation with the appropriate mount and a suitable counterpoise radial system.

Specifications of the Yaesu ATAS-120A Auto Active Tuning Antennas:

• Bands: 40, 20, 15, 11, 10, 6 and 2m and 70cm.
• Height, appx: 1.39 to 1.60m.
• Weight, appx: 0.900Kg.
• Input Impedance: 50Ω.
• Maximum Power: 120 Watts, SSB, CW, 50 percent duty cycle.
• Matched SWR: Less than 2.0:1 with proper grounding or counterpoise.

ATAS-120A Manual