IRIDIUM ACTIVE ANTENNA - AA511
Iridium satphones were originally designed to operate with a passive antenna, 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 perfor-
mance due to attenuation of both the received and transmitted signals. A 3dB loss corresponds to
approximately 20m of LMR600 or 6m of LMR240 coaxial cable, lengths that clearly restrict the mount-
ing options for the antenna using standard down-leads.
with type ‘N’ connectors, or a down-lead with an equivalent loss. Designed for harsh environments, the
AA511 consists of two RHCP dipole antennae housed within a single 4mm thick GRP radome mounted
on a common base. One antenna is for signal transmission and one for reception. A linear power ampli-
50 MHz centred on the Iridium band to attenuate any out of band interference that may arise.
OVERVIEW
pg 1
rev 2.1
A
