Duplexer UHF 400-470 MHz

A duplexer lets one antenna carry both the transmitter and the receiver at once. Without it, a repeater needs two antennas far enough apart that the transmitter does not deafen its own receiver, which on most sites means a second mast position that is not available.

The filter is tuned before it ships, and how it is tuned decides what it delivers. Tuned to a single pair of frequencies it suppresses more than 85 dB, both of transmitter noise on the receive frequency and of the transmit signal reaching the receiver. Tuned across a 2 MHz band for multi-channel use it holds more than 65 dB, with the same insertion loss of 1.2 dB. That is why the frequencies are asked for at the time of order.

Six full-length quarter-wave cavities sit in an extruded aluminium housing on a passivated steel chassis, with PTFE insulation in the cables and the connectors. The outside is vinyl-coated against corrosion. Frequency stability is around 4.5 ppm per degree, and the filter is rated from −30 °C to +60 °C.

Also available for other bands: VHF 144-175 MHz, VHF 68-88 MHz and Marine VHF. Mounting plate MP002 is ordered separately. Contact sales for special solutions.