Active Transmit and Receive Antenna

Designed for harsh environments, the AD510-10 consists of two RHCP dipole antenna 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.

AD510-10 Active Transmitter/Receiver Antenna with a 30m or 40m RG213U down-lead and DC regulator for Iridium Telephone Systems


Introduction


Iridium telephones were originally designed to operate with passive antennae, either an element attached directly to the handset, or a remote aerial connected with a short length of coaxial cable. Unfortunately, a signal loss of more than 3dB in a remote antenna?s connecting cable degrades performance due to attenuation of both the received and transmitted signals. A 3dB loss corresponds to approximately 10m of RG213U or 3m of RG58U coaxial cable, lengths that clearly restrict the mounting options for the antenna using standard down-leads.

The AD510-10 active Iridium antenna (figures 1&2) is designed for use with 30m (98 feet) or 40m (131 feet) of RG213U coaxial cable terminated with type ?N? connectors. Designed for harsh environments, the AD510-10 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.

Using manufacturing techniques proven for a range of extremely rugged GPS/DGP active antennae, the antenna base is milled from aluminum and hard anodised, giving an attractive green finish, which is mechanically resilient and resistant to corrosion.
The antennas weight is 2.6kg.

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