DF SPINNER ANTENNA SYSTEM Direction Finding (DF) Spinning Antenna System The ASC Signal spinning DF antenna system is a compact, lightweight DF antenna designed for mobile, marine and airborne applications. Frequency coverage is from 0.5 to 8 GHz with an extended band version up to 40 GHz available. Antennas are slant linear polarized with the high band antenna (2 - 18 GHz) also available in dual polarization if required. The DF antenna system operates in either full spin, variable spin, sector scan or manual modes providing versatility and adaptability to mission requirements. The rugged construction and flexible configuration allows for applications on ground-based, marine or airborne platforms. The directional antenna assembly is comprised of a 0.5 - 2 GHz log periodic dipole array and a 2 - 18 GHz parabolic reflector with a log periodic feed. The extended band variant employs two horn antennas covering 18 - 26 GHz and 26 - 40 GHz. An optional omnidirectional antenna mounts on top of the spinning DF Antenna radome. The direct-drive pedestal design provides high reliability by minimizing the number of moving parts. A single channel RF rotary joint connecting radio frequency signals is mounted on the rotator center line. The pedestal can be designed to accommodate customer furnished RF distribution circuitry and millimeter wave down converters. The system comes complete with a custom designed, full function antenna control unit mounted in a half rack ATR chassis with RS422 serial communication. For improved environmental protection, both the DF spinning and omnidirectional antennas are radome enclosed. ANTENNA FEATURES • Compact Package • Spin, Sector and Point Modes • ±0.2° Accuracy & 0.1° Pointing Resolution • Rugged and Field Tested • Multi-platform Applications • DC Brushless Motors & No Slip Ring Assembly • RS-422 Controlled • Radome Enclosed for Protection • Optional Omni Antenna Direction Finding (DF) Spinning Antenna System ©2012 ASC Signal Corporation DF SPINNER ANTENNA SYSTEM Direction Finding (DF) Spinning Antenna System DF Spinning Antenna Omni Directional Antenna Frequency Range Low Band 0.5 - 2.0 GHz High Band 2 - 18 GHz Extended Band Frequency Range 18 - 40 GHz Low Band High Band 0.5 - 8.0 GHz 8 - 40 GHz Polarization: 45 Degrees Slant Linear, Dual Polarization available on High Band Polarization Slant Linear Antenna Gain* Elevation Beamwidth Deviation from Omni 25o Typical 12o Min. (3 dB Points) ±4 dB Maximum Frequency (GHz) 0.5 - 2 2 4 8 12 18 18 - 26 26 - 40 Minimum (dBi) 4.0 24.0 12.0 15.0 17.0 19.0 12.5 12.5 Frequency (GHz) 0.5 - 2 2 4 8 12 18 18 - 26 26 - 40 Maximum (Degree) 85.0 24.0 12.0 6.0 4.0 3.0 30.0 35.0 Antenna Gain* * Measured at Antenna Feeds Azimuth Elevation 15o Minimum Beamwidth (-5o - +10o Relative to Horizon) Azimuth Frequency (GHz) Degrees 0.5 - 2 ± 4.0 2 - 12 ± 1.5 12 - 18 ± 1.0 18 - 40 ± 3.0 VSWR <3.5:1 (Measured at Antenna Connectors) Spin Rate 0 - 200 rpm F Search Scan Rate >30o Sector 1o - 60o/Sec <300 Sector 2x Sector Width o/Sec Size 19.5 in. Diameter x 17.5 in. High Weight 40 lb VSWR Size Weight Frequency (GHz) 0.5 - 0.6 0.6 - 0.75 0.75 - 1.0 1.0 - 1.5 1.5 - 2.0 2.0 - 8.0 8.0 - 18.0 18.0 - 40.0 Maximum (dBi) -10 -7 -5 -4 -2 0 -4 -4 0.5 - 0.85 GHz 0.85 - 18.0 GHz 18.0 - 40.0 GHz 19 in. Diameter x 15 in. High 18 lb <6:1 <3:5:1 <3:1:1 Antenna Controller Dimensions (Nominal) 15 in. x 8 in. x 22 in. Half Long ATR, ARINC 404A Form Factor Weight 18 lb Input Power 110/220 VAC ± 10%, 50/60/400 Hz, Single Phase Modes: Standby, Designate, Scan, Spin, Variable Spin, Halt, Resume Environmental Altitude Temperature Up to 50,000 Feet Operational -20o to 50oC Storage -40o to 70oC Humidity 0 to 95% Rain, Sand, Dust, Vibration and Shock: Designed to Meet the Intent of MIL-STD -710 Direction Finding (DF) Spinning Antenna System ©2012 ASC Signal Corporation