FreeWave Technologies
August 13, 2004
2.4GHz Spread Spectrum Installation Guide
V3.7
LIG0002AC Rev A
6 of 12
Table 3 below shows how the RF Xmit Power settings on the radio correspond to the EIRP of
the transceiver-cable-antenna combination for the 14 dB Yagi antenna at different cable loss
values for Point-to-Multipoint systems.
Shaded area indicates combinations where EIRP limitations exceed FCC regulations
and RF Xmit Power must be reduced.
The table below shows the RF loss at various cable lengths at 2.4GHz.
Length in Feet
LMR240
LMR400
10 1.3dB
.7dB
20 2.6dB
1.4dB
25 3.2dB
1.7dB
30 3.9dB
2.1dB
50 6.5dB
3.4dB
100 12.9dB
6.8dB
Follow the steps below to configure the Power Output Level:
9
Start HyperTerminal or any other terminal emulation program on the computer connected
to the transceiver’s RS232 port (refer to the User Manual for the HyperTerminal setup
instructions).
9
Invoke the Setup menu on the transceiver.
9
Choose option number
3
from the Main Menu on the HyperTerminal window.
9
Choose option number
5
from the Radio Parameters menu followed by the settings an
appropriate RF Xmit Power value, which is defined in the previous transceiver installation
procedure.
Table 3:
FreeWave Technologies 2.4GHz EIRP for 14dB
Corner Reflector Antenna, Point-to-MultiPoint
systems, Cable loss vs. RF XmitPower Setting.
Cable Loss
1dB
2dB
3dB
4dB
9
39.43
38.43
37.43
36.43
8
38.98
37.98
36.98 35.98
7
38.17
37.17
36.17 35.17
6
37.93
36.93 35.93
34.93
5
34.96 33.96 32.96 31.96
Table 4:
Cable loss at 2.4GHz
RF Xm
it Power
