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VAS-108-01: Quick Reference Data

Part Number -- VAS-108-01

Name: Broadband Vehicular  Whip Antenna
Category: VHF Antennas
Diagram(s): Diagrams and Mounting Details
Photo(s): VAS-108
Frequency Range: 25 MHz to 88 MHz - for antennas (repeated below)
Features: * Broadband with Extended VHF Range
* Extremely Rugged and Reliable
* Base Mount for Replacement Flexibility
* East Assembly/Disassembly

Description:


The VAS-108-01 is a Broadband Vehicular Whip Antenna system designed specifically for tactical VHF jamming applications. The antenna also functions well to provide reliable VHF communications for a range of military vehicles when used with a frequency agile radio that operates within its extended VHF frequency band of 25-88 MHz.

The complete antenna system is comprised of an upper whip, a lower whip and an insulated mounting base. The two whips thread together by hand which are then screwed onto the base matching unit to complete the system.

The insulated mounting base houses the impedance matching network which provides a VSWR of less than 3.5:1 across the operating frequency band. The matching network is capable of continuous transmit power levels of up to 100 watts.

The VAS-108-01 provides many safety features, both for the user and the equipment attached: High voltage isolation up to 10 Kv (RMS) in the whip sections in case of accidental strike of the antenna to overhead power-lines; a moulded neoprene rubber eye protection device installed at the tip of the whip; and an EMP (Electromagnetic Pulse) protection device integrated within the base matching network.

Electrical Characteristics

Frequency Range: 25 MHz to 88 MHz
Azimuth Coverage
[Radiation Pattern]
:
Omni-directional +/- 1 dB
VSWR: 3.5:1 maximum
2.5:1 average
Polarization: Vertical
Power Handling: 100 watt continuous for 60 mins.
High Voltage Isolation: 10 kV upon contact with high power line or high voltage source
Nom Input Impedance: 50 OHMS
Input Connector: BNC

Mechanical Characteristics

Weight: 10.5 lbs. (4.76 kg)
 Installed Height: 127.5 in (3.24 M)
 Overall Height: 130.8 in (3.32 M)

Environmental Characteristics

Temperature: -60°F to +160°F (-51°C to +71°C)
Vibration: MIL-STD-810D. Method 514.3, Proc 2, CAT 3
Wind Velocity: 50 Mps (80 Kph) operating
Ice Loading: 1/2 inch (13 mm) radial
Shock: Impact - 25 Blows against 4x4 oak beam at 25 MPH
Ballistic shock to MIL-S-901, Type A
Fungus: MIL-STD-810 Method 508.1 (28 days)
Immersion: MIL-STD-810 Method 512.1
Salt Fog: MIL-STD-810 Method 509.1 (48 HR exposure)
Rain: MIL-STD-810 Method 506.1 Procedure 1
 

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