DF Spinning Antenna

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