Circularly polarised active receiver antenna

The BETSO CPAA-18 is an active circularly polarised receiver antenna for demanding wireless microphone systems. Circular polarisation improves reception when the transmitter antenna changes orientation or when reflections and obstacles disturb a linear RF link.

Its ultra-low-noise amplifier can be adjusted from -9 to +18 dB, making it useful with both short cables and longer cable runs that need loss compensation. The antenna is powered through the coaxial cable from a 5-20 V DC source.

Key features
- Circular polarisation for orientation-independent reception
- Active UHF antenna for professional wireless systems
- Adjustable gain from -9 to +18 dB
- Ultra-low-noise amplifier below 0.75 dB
- High input filtering against unwanted RF spectrum
- Water-resistant construction for field use

Specifications
Frequency range | 470-850 MHz
Antenna gain | 7.5 dB average, 8.5 dB peak
Directivity | Cardioid
Polarisation | Circular
Amplifier gain | -9 to +18 dB
Amplifier noise figure | < 0.75 dB
Powering | 5-20 V DC through coaxial cable
Current consumption | 35 mA
Mounting | 1/4 and 3/8 inch threads, 100 x 100 mm M4 pattern
Dimensions | 315 x 315 x 110 mm
Weight | Approx. 1.4 kg