Name: MA-445C

Text: MA-445C
HF/VHF/UHF DF Antenna
The MA-445C HF/VHF/UHF DF Antenna provides accurate direction finding
(DF) over the 2 to 2,000-MHz frequency range in a small and lightweight unit.
The antenna was designed for use on vertically-polarized ground wave
and sky wave signals. The MA-445C may be ground or tripod mounted,
and can also be operated from the top of a ground vehicle with a
metal roof using Linkabit’s optional vehicle mounting strap. In the
AN/PRD-13(V)1 and AN/PRD-13(V)2 system configurations, a
common RF/control cable is used to connect the MA-445C to
Linkabit’s SIGINT receiver/processors (MD-403A and MD-405A).
The MA-445C is physically divided into two frequency sections:
2–100 MHz (called the HF portion) and 100–2,000 MHz (called the
VHF/UHF portion). The unit design incorporates several antenna technologies:
• Ferrite-loaded crossed loops plus a short active monopole whip
covering 2–100 MHz
• An annular slot with eight feed points covering 100–460 MHz
• A four-element monopole array covering 460–2,000 MHz
Each antenna section has an independent calibration (frequency versus angle)
correction table read by the receiver/processor on power-up, as well as an
independent built-in test (BIT) oscillator to help isolate failures between antenna
sections. The VHF/UHF section contains a switchable low noise, high
performance preamplifier. The preamplifier can be enabled to improve antenna
sensitivity and offset coaxial cable loss.

MA-445C
HF/VHF/UHF DF
A NTENNA - E LEMENT
ATTACHED

MA-445C HF/VHF/UHF DF Antenna
MA-445C HF/VHF/UHF DF Antenna Features
Performance Characteristics
Frequency Coverage
Azimuth Coverage
Elevation Coverage, 2–100 MHz
Elevation Coverage, 100–2000 MHz
Bearing Accuracy 1
Bearing Sensitivity 2
Polarization
Output Impedance
Preamplifier (100–2,000 MHz)

2–2,000 Mhz
360°
0° to 10°
0° to 60°
3° RMS typical
See chart
Vertical
50 Ohms unbalanced
Selectable (In/Out)
Gain: 18 dB nominal
NF: 4.0 dB nominal
IP 3 : +18 dBm minimum
RF: Waterproof BNC; Control: Sealed JT quick disconnect

Connector

Physical and Environmental Characteristics
Size (diameter)
Height (less whip)
Weight
Power
Temperature
Humidity
Altitude

330 mm, 13 in.
140 mm, 5.5 in.
4.08 kg (9 lbs.)
1 Watt maximum at 12 VDC
Operating: –20° to +50° C; Storage: –40° to +70° C
0 to 100% Condensing
4,572 m (15,000 ft)

1 Test range, AM demodulator, un-modulated signal, 1 sec. integration, 20 dB S/N
2 Test range, AM demodulator, un-modulated signal, 6° RMS degrees jitter, 1 sec. integration. Bearing accuracy and sensitivity in
operational situations are subject to the effects of installation, proximity of large conductive objects, terrain, and elevation

Note: All specifications subject to change without notice

Part Number
02-105608-01
05-103228-01
05-105872-01
03-102475-01

Description
MA-445C Antenna
Tripod
RF/Control Cable
Tie Down Kit

Includes
Antenna, Manuals
Antenna Tripod
Cable
Antenna Mount Strap

Note: All specifications subject to change without notice

Cleared by DoD/OFOISR for public release under
OFOISR Case Number 06-S-1601 on June 22, 2006.
LINKABIT DIVISION
3 0 3 3 S C I E N C E PA R K R O A D , S A N D I E G O , C A 9 2 1 2 1
( 8 5 8 ) 5 5 2 - 9 5 5 5 FA X ( 8 5 8 ) 5 5 2 - 9 6 6 8 W W W. L - 3 C O M . C O M
Product Ser vice Help Desk Number: 1-800-331-9401
e-mail: LinkabitProducts@L-3com.com
1078010005

Document Path: ["brochure605.pdf"]

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