Single Isolator 100 W, VHF 136-174 MHz

On a mast carrying several transmitters, the signal from one radio finds its way into the output stage of the next. What comes back out is intermodulation: frequencies that were never transmitted, landing on channels in use. The isolator sits between transmitter and antenna and passes power one way only, so the neighbouring transmitter never reaches the output stage.

The reverse load is inside the housing, so no external dummy load is needed. If the antenna is damaged or disconnected, it absorbs the reflected power instead of the transmitter output stage — 30 W for two minutes with no extra cooling, and continuously when the isolator is mounted on an MP007 plate, inside a BS2000 cabinet, or otherwise given a thermal path to a heat sink. Housing is coated die-cast aluminium with N-female connectors on both ends, rated from −20 °C to +60 °C.

Where one stage is not enough, the dual VHF isolator doubles the isolation to 40 dB at the cost of 1.5 dB insertion loss. For other bands, see the UHF 400-470 MHz and low band 68-88 MHz versions. Contact sales for special solutions.