Yaesu ATAS-120A Active Tuning Antenna System 7–430MHz, 120W, Auto-Tune

Yaesu ATAS-120A Active Tuning Antenna System

The Yaesu ATAS-120A is a motorised, auto-tuning mobile antenna designed exclusively for Yaesu transceivers equipped with the ATAS (Active Tuning Antenna System). Compatible with the FT-897, FT-857, FT-847, FT-100/100D and FT-450, it automatically resonates the radiating element for the lowest SWR using control voltages sent via the coaxial cable — no manual tuning required. Covering 7 to 430MHz, it's an ideal all-in-one solution for mobile HF/VHF/UHF operation.

Key Features

• Automatic motorised tuning — resonates via coax control voltage from the transceiver
• Covers 7, 14, 21, 28, 50, 144 & 430MHz bands
• 20% faster tuning speed than the ATAS-100
• Solid 'trombone' sliding sections for durability
• Mounts directly onto a standard SO239 mobile antenna mount (not supplied)
• Compatible with FT-897, FT-857, FT-847, FT-100/100D & FT-450
• Optional ATBK-100 VHF/UHF antenna base kit available separately

Technical Specifications

• Frequency: 7 / 14 / 21 / 28 / 50 / 144 / 430MHz
• Max Input Power: 120W (A3J)
• Input Impedance: 50Ω
• Matched SWR: <2.0:1 (with proper counterpoise)
• Connector: PL259 (for SO239 base)
• Length: 1.4–1.6m
• Weight: 900g

Note: The ATAS-120A is designed specifically for Yaesu transceivers with ATAS capability and is not compatible with other transceiver brands or models.