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specific link – for example when the link is heavily obscured by dense woodland on an NLOS link
or extremely long LOS links (>80km or >50 miles) over water.
The external antennas can be either dual-polarization (as the integrated antenna) or two single
polarized antennas can be used in a spatially diverse configuration. It is expected that the dual-
polarization antennas would normally be used to simplify the installation process; spatially diverse
antennas may provide additional fade margin on very long LOS links where there is evidence of
correlation of the fading characteristics on Vertical and Horizontal polarizations.
Dual polarization antennas (with a gain greater than the integrated antenna) are currently only
available in parabolic dish form.
13.5 Link Budget
An estimate of the link budget for a specific application can be obtained by using the Motorola
Systems link estimation tools. For more information see the Motorola web site.
13.6 Regulatory Issues
Installations must conform to any applicable local regulations for the Equivalent Isotropic Radiated
Power (EIRP).
Ensuring compliance becomes more complex when the connectorized unit is used with external
antennas which may be locally sourced. With higher gain external antennas fitted, the Maximum
Transmit power may need to be reduced for operation in specific countries.
See table in
In some regions, operation of the PTP54500 products is constrained by an EIRP limit. The normal
constraint is that the EIRP does not exceed 30 dBm (33 dBm for PTP58500) for radio signals with
a bandwidth of
then the limit is 30 dBm EIRP (33 dBm for PTP58500).
When operating with external antennas, the installer/operator has to set the maximum transmit
power to ensure that the EIRP limit is not exceeded. The Set_Max_Transmit_Power is calculated
as below:
Set_Max_Transmit_Power = [Max_Transmit_Power] rounded down to nearest lower dB.
13.6.1 Antenna Choice (FCC and Industry Canada Regions Only)
The antennas which can be deployed with the Connectorized 500 Series Bridge are shown in
Section 13.6.3
USA / Canada – 5.4 GHz".
For FCC and Industry Canada, the PTP500 Series Bridge has been designated to operate with the
antennas listed in
"Antennas for USA / Canada – 5.4 GHz", and having a maximum gain of 37.7 dB (34.9 dB for
5.4 GHz product variant). Antennas not included in these tables or having a gain greater than
37.7 dB (34.9 dB for 5.4 GHz product variant) are strictly prohibited for use with this device. The
required antenna impedance is 50 ohms.
PTP 500 Series Bridge - Connectorized Model
Section 5.2
for any EIRP restrictions that may apply in your region.
=20 MHz. As the PTP54500 operating bandwidth is approximately 27 MHz,
"Antennas for USA / Canada – 5.8 GHz" and
Section 13.6.3
"Antennas for USA / Canada – 5.8 GHz" and
151
Section 13.6.4
"Antennas for
Section 13.6.4
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