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F-3990 This VHF antenna is designed for applications that require peak performance in the 136-174 MHz while tolerating a VSWR around 2.0:1. This antenna has a loading coil between the radiating element and the base. This coil increases the electrical length and makes the antenna perform electrically as a 1/4 wave antenna, but shorter than a regular 1/4 wave antenna. Typical gain, when mounted on a ground plane, is comparable to a full 1/4 wave. Mounts on NMO. The upper element is made from a brass wound cable with a flexible shaft core, well sealed using rubber shrink material. This solution offers a high reliability and prevents breakage or brittleness. Other frequencies are available upon request. DOWNLOAD PDF -
Designed for external Public Safety Radio Frequencies to propagate within buildings, tunnels or public use environments
- Designed for mounting on a concrete surface to meet full bandwidth specifications
- Meet the recommended fire safety practices of both the Federal Transit Administration (FTA) and the Federal Rail Administration (FRA) for smoke emission and flammability as tested under ASTM E-662 and ASTM E-162
- Flame resistant and self-extinguishing polycarbonate tubing is used for the radome
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Designed for minimizing interference from adjacent channels and outside systems
- Available in single, dual, triple or additional units
- Temperature compensated to ensure frequency stability
- High attenuation to minimize desense and interference from adjacent systems
- Adjustable loops: each cavity has a calibration index for easy field tuning
