User's Guide

10 Connectorized PTP 500 Series Bridge
181
10.5.3 The Set_Max_Transmit_Power parameter
As the actual maximum transmit power can only be adjusted in 1 dB steps, then the installer
or operator must configure the PTP 54500 or PTP 58500 to have a
Set_Max_Transmit_Power parameter as calculated below:
Set_Max_Transmit_Power = [Max_Transmit_Power] rounded down to nearest lower
dB step
In order to simplify matters, the settings to be used for regions with the EIRP limits in Table
18 (a
ssuming short feeder cables) are shown in Table 19.
Table 19 - Se
tting maximum transmit power to meet ETSI EIRP limits
Set_Max_Transmit_Power parameter
setting (dBm)
Antenna
size
Maximum
available
antenna
gain (dBi)
Operating
bandwidth (MHz)
5.4 GHz 5.8 GHz
5 -6 0
10 -3 3
2ft dish 29.4
15 -2 4
5 -8 -2
10 -5 1
2.5ft dish 31.2
15 -3 3
5 -10 -4
10 -7 -1
3ft dish 33.4
15 -5 0
5 -11 -6
10 -8 -3
4ft dish 34.8
15 -7 -1
NOTE
Table 19 has been calculated on the basis of 0.5 dB cable loss and the highest gain
antenn
as per size of which Motorola are aware. At these operating frequencies,
feeder losses even with short cables are unlikely ever to be below 0.5 dB for practical
installations and cable diameters.
NOTE
For limitations on setting Transmit Power for PTP 58500 products operating with 5
MHz channel Bandwidth in USA and Canada, see Section 16.3.8 “PTP 58500 FCC
Antenna Re
strictions”.