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You must carefully select antennas for 905U-L-T modules to avoid contravening the
maximum power limit on the unlicensed channel. The net gain of the antenna/cable
configuration should be no more than 6dB in North America (USA, Canada, Mexico) and
no more than 0 dB in Australia / New Zealand.
Note
The net gain of an antenna/cable configuration is the gain of the antenna (in dBi) less the
loss in the coaxial cable (in dB).
For example, an SG900-6 antenna with a CC20/900 cable has a net gain of 2dB (i.e. +8
dB – 6 dB) at 900 MHz.
The 905U-L-R module has no limitation on antenna gain, as this module does not
incorporate a radio transmitter.
The following table details the gains of some typical antennas:
Antenna
Dipole with integral 3m cable
Dipole without cable
5dBi Collinear (3dBd)
8dBi Collinear (6dBd)
3 element Yagi
6 element Yagi
The following table details losses for typical cables:
Cable
Loss (dB per 10m)
at 900 MHz
RG58
-5
RG213
-2.5
Cellfoil
-3
905U-L Wireless I/O
Version 1.9
Gain (dBi)
0
2
5
8
5
10
905U-L Wireless I/O Installation Manual
Page 14 of 40
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