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Part Number -- AS-3900A/VRC |
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| Name: | Broadband Vehicular Whip Antenna |
| Category: | VHF Antennas |
| Photo(s): | AS-3900 |
| Height: | 113 in (2.86 M) (repeated below) |
| Frequency Range: | 30 MHz to 80 MHz - for antennas (repeated below) |
| Features: | * Minimum
maintenance * High Reliability * Broadband * Weatherproof |
| Description: | The
AS-3900A/VRC is a broadband vehicular whip antenna system designed
for use with the U.S. Army's SINCGARS secure radio system. It
provides VHF communications for a range of military vehicles and can
be used with any frequency agile radiio that operates within its
30-88 MHz frequency band. This antenna can also be used as a
direct replacement for the AS-1729/VRC and AS3684/VRC antenna
systems. Incorporated into the AS-3900A/VRC is a newly designed heat sink to accommodate the high transmitting power level of 150 W with a maximum VSWR of 3.5:1 over the frequency band. The antenna system gain varies from -7 to -1 db over the operating band relative to a resonant quarter-wave monopole. The complete antenna system is comprised of a two piece whip antenna and an impedance matching base unit. The antenna portion is made up of an upper whip (A3017901-2 Antenna Element - Top Section ) and a lower section (A3018230-1 Antenna Element - Center Section) which are assembled by screwing together by hand. The assembled antenna portion is then screwed onto the rugged spring of the base matching unit (A3017902-2 Antenna Subassembly - Insulator/Adapter) to complete the system. The AS-3900A/VRC is a center fed antenna system. The lower antenna whop section acts as a transmitted line to apply the input (X power to a point near the middle of the antenna. This approach complements the impedance matching function of the base unit to provide the antenna with its broadband operating characteristic without the need of a ground plane. EMP (electromagnetic pulse) and high voltage protection are also incorporated into the AS-3900A/VRC. An integral high voltage blocking capacitor in the upper whip section provides high voltage isolation to 20 kVrms. This results in increased safety to personnel and equipment in the case of an accidental strike of the antenna to an overhead power line. A molded neoprene rubber eye protection device at the tip of the antenna provides further safety to the user. |
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Electrical Characteristics |
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| Frequency Range: | 30 MHz to 80 MHz |
| Polarization: | Vertical |
| Power Handling: | 150 Watts continuous for 60 minutes |
| Azimuth
Coverage [Radiation Pattern]: |
Omnidirectional (azimuth plane) |
| Impedance: | 50 Ohms nominal |
| VSWR: | 3.5:1 (1.0:1 under environmental conditions) |
| Gain: | -7.6 dB @ 30 MHz to -1.1 dB @ 88 MHz (relative to a resonant quarter wave monopole) |
| High Voltage: | 20 KV rms Lower element: 10 KV rms to MIL-STD-202 |
| Input Connection/or: | BNC |
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Mechanical Characteristics |
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| Height / Length: | 113 in (2.86 M) |
| Weight: | 9.5 Lbs. (4.31 kg) |
| Color: | Type II Green per MIL-C-46168 |
| Mounting: | Mid-mount flange has four 0.453 in. dia. holes (for 3/8 in. bolts) and 4.50 in. bolt circle |
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Environmental Characteristics |
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| Temperature: | -60°F to 160°F (-51°C to 71°C) |
| Humidity: | MIL-STD-810, Method 507.1, Procedure III |
| Fungus: | MIL-STD-180, Method 508.1 |
| Immersion: | MIL-STD-810, Method 512.1, Procedure I |
| Salt Fog: | MIL-STD-810, Method 509.1, Procedure I |
| Rain: | MIL-STD-810, Method 506.1, Procedure I |
| High Voltage: | MIL-STD-202, Method 301 |
| Vibration: | Loose
cargo - MIL-STD-810D, Method 514.2, Procedure II Sine - MIL-STD-810C, Method 514.2, Procedure VIII |
| Shock: | Impact - 25 blows against 4 x 4 inch oak beam at 25 mph Ballistic shock - MIL-S-901, Type A |
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