Wave Wireless Corporation 915B Manual Do Utilizador
TN138A
915B Radio Operational Requirements
Lawrence Gordon
Page 9 of 9
Last saved on 14-Sep-06 4:52 PM
F:\Tech Notes\TN138A - 915B Radio Operational Requirements.doc
This table shows the cable losses required to use the highest gain antennas of each approved type
when mounted indoors. Note that the System EIRP must be no more than 34.8 dBi for an indoor
antenna, so that the radiation at a min. separation of 20 cm is within the required safety limits.
For practical installations, an antenna of lesser gain is more likely to be used for indoor
installations, so this table is a guideline for the worst cases.
when mounted indoors. Note that the System EIRP must be no more than 34.8 dBi for an indoor
antenna, so that the radiation at a min. separation of 20 cm is within the required safety limits.
For practical installations, an antenna of lesser gain is more likely to be used for indoor
installations, so this table is a guideline for the worst cases.
Table 4 – Cable Loss Requirements for Indoor Antennas
# Antenna
Type
Power at Antenna
Port (dBm) – peak
+ Antenna
Gain (dBi)
- Cable
Loss (dB)*
System EIRP
(dBm)
Min. Sep.
Warning
1 Onmi-
Directional
Dipole
Dipole
27.3 12.15
4.65
34.8
20
cm
2 Log-periodic
27.3
16.15
8.65
34.8
20
cm
3 Dipole
array
27.3
13.65
6.15
34.8
20
cm
* Cable loss here also includes insertion losses due to devices and connectors.