The Trimble® Bullet dual band GPS L1/L2 antenna is designed specifically to address the need of "critical infrastructure sectors" of the economy. GNSS timing application will benefit from increased signal availability, L1/L2 redundancy and elimination of atmospheric effects using dual frequencies techniques.
Put It Anywhere
The antenna is housed in completely waterproof packaging designed to withstand exposure to shock, excessive vibration, extreme temperatures, rain, snow and sunlight. The enclosure is a textured off-white colour and is both weatherproof and waterproof. The dome is all plastic, and the threaded socket in the base of the antenna is corrosion resistant. The threaded socket accepts either a 1?-14? straight thread (typical marine antenna mount) or a 3/4" pipe thread. The F-type or TNC antenna connector is located inside the threaded socket, which allows the antenna cable to be routed inside the pole and protects the cable connection for added reliability.
The Bullet dual band antenna is an active GPS L1 and L2 bands antenna with 35dB preamp (5V DC), 30dB preamp (3.3 VDC). The high-gain preamp allows the Bullet DB antenna to be used with up to 75 feet of RG-58 or RG-59 cable. The Bullet DB filtering improves impunity to other RF signals for reliable performance in hostile RF jamming environments.
For over 20 years, Trimble has sold GPS antennas renowned for their survivability in tough environments. The Bullet dual band antenna is the fifth generation of the proven Bullet antenna family and offers all the reliability and performance benefits that are required for mission critical installations.
In unforgiving environments, an antenna failure could be disastrous. Don't risk it. Select a proven GNSS antenna – the Trimble Bullet DB antenna.
Recommended Cable & 50/75 Ohm Issue
Trimble recommends the use of a RG59, 75-ohm cable as a low cost and readily available coaxial cable for the Bullet antenna. Extensive testing by Trimble has shown a minimal attenuation factor of less than 0.5dB (1/2dB) loss using the 75 Ohm cable with a 50 Ohm connector and antenna. The GPS frequency of 1575.42 MHz has negligible attenuation effects between the differences of equipment impedance.
Trimble recommends that the utmost consideration be given to the coaxial cable distance from the Bullet III antenna to the GPS module, including the GPS input receive level, using either 50 or 75 ohm coaxial cable. Using Trimble embedded products, allow for a minimum of 18 dB of gain at the R/F connector input of the GPS and 20 dB of gain at the R/F connector for the ThunderBolt Disciplined Clock. While the Bullet antenna will effectively perform for other vendor supplied GPS products, the correct input sensitivity level is required for optimum functionality.
The Bullet L1/L2 has a 1”-14 thread and comes with either a TNC or F-TYPE connector.