CR-3
The CR-3 is a zero centered L1/L2 reference base station antenna mounted on our single-depth choke ring. It features a fully weatherproof design with an optional cone environmental cover. The CR-3 choke ring antenna brings proven technology and reliability to high-end reference station systems.

It weighs about 3.7 kg with a diameter of 32.6 cm and height of 10.1 cm (without cone cover). The included LNA accepts voltages from 2.7 to 12 volts and has 32 ± 2dB of gain. Output impedance of the antenna is 50 Ohms. Frequency ranges are from 1565 to 1620 MHz and 1217 to 1260 MHz and the antenna has N type connectors.

CR-4
Topcon's CR-4 antenna is an L1/L2 Choke Ring antenna (JPL spec) using a Dorne & Margolin vertical dipole element.

Topcon continues to lead all GPS manufacturers with a multitude of new and innovative products.
The CR-4 GPS antenna is an exciting addition to complete the line of Topcon GPS products. The CR-4 antenna and the Topcon antenna cables are equipped to endure the harshest of environments.

CR-4 Features Include:

• JPL spec choke ring antenna
• Designed for highly efficient multipath reduction
• Available with or without environmental cone cove

CR-G3
The CR-G3 is a triple constellation capable GPS+ choke ring antenna.