Antennas - Iridium

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 antenna with DC regulator

The RST520 active Iridium antenna can easily support up to 55m of LMR400 cable and longer cable runs can be supported with thicker cable runs. Designed for harsh environments, the RST520 consists of two RHCP dipole antennae housed within 4mm thick GRP radomes mounted on a common base. One antenna is for signal transmission and one for reception. A linear power amplifier within the base and connected to the transmitting antenna compensates for signal loss incurred mainly by the connecting cable. Similarly, a low noise amplifier is attached to the receiving antenna via a low loss interdigital filter to boost the signal sent to the telephone. The interdigital filter has a bandwidth of 12 MHz centred on the Iridium band designed to attenuate any out of band interference that may arise, for example from nearby Inmarsat uplinks.