Installation manual

105U-L Wireless I/O Installation Manual
105U-L Wireless I/O Page 12 of 38
Version 1.9
You must carefully select antennas for 105U-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 105U-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 Gain (dBi)
Dipole with integral 3m cable
0
Dipole without cable
2
5dBi Collinear (3dBd)
5
8dBi Collinear (6dBd)
8
3 element Yagi
5
6 element Yagi
10
The following table details losses for typical cables:
Cable Loss (dB per 10m)
at 900 MHz
RG58
-5
RG213
-2.5
Cellfoil
-3