Yaesu's Active-Tuned Antenna System (ATAS-100/-120) is a unique HF/VHF/UHF mo- bile antenna system, which provides automatic tuning when used with 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. ATAS Antenna Control. A simple and convient to use control box for mobile HF operation. The Yaesu ATAS HF Screwdriver Antenna. Due to popular demand, in this Yaesu's Active-Tuned Antenna System (ATAS-100) is a unique HF/VHF/UHF mobile antenna system, which provides automatic tuning when used with the FT-100. Yaesu FT-857D Manual Online: Atas-100/-120 Operating Tips. derive the best performance possible from the ATAS- 100/-120 Active-Tuning Antenna System. The ATAS-100 is a unique mobile antenna designed for use with the FT-847 HF/VHF/UHF Note: Installation of the ATAS-100 on a hatchback or trunk. for the vertical radiating element. h. Connect the coaxial cable from the mounting base to the. transceiver's HF antenna jack. i.The images are very instructive in explaining the inner workings of the ATAS100 antenna. Page 1. Circuit Diagram. Page 2. Parts Layout on PC board. The optional ATAS-100/-120 Active-Tuning Antenna System provides operation on a number of HF bands (7/14/21/28 MHz) plus 50 MHz, 144 MHz, and 430 MHz.