Cable Losses (Fcc Regions Only); Antenna Choices; Table 17 - Cable Losses Per Length - Motorola PTP 500 Series User Manual

10.5.1 Cable Losses (FCC Regions Only)

The FCC approval for the product is based on tests with a cable loss between the units of not
less than 1.2 dB at 5.8 GHz. The use of lower cable losses would result in the installation
being outside the FCC rules. As an indication, 1.2 dB of cable loss corresponds to the
following cable lengths, excluding connector losses (source: Times Microwave).
Cable
LMR100
LMR200
LMR300
LMR400
LMR600

10.6 Antenna Choices

The main selection criterion is the required antenna gain. The secondary criterion is the ease
of mounting and alignment. For example, the Radio Waves Parabolic dishes are supplied with
a mount that allows adjustment for alignment independent of the actual antenna mounting.
This type of antenna is much easier to align than those that have to be rotated around the
mounting pole for alignment.
In non-FCC regions, antenna choice is not restricted, but any region specific EIRP limit must
be obeyed by reducing the maximum Transmit power, see Section 4.2 "Licenses and Region
Codes".
In FCC regions, antenna choice is restricted as described in Sections 16.2.8 "PTP 54500
FCC Antenna Restrictions" and 16.3.8 "PTP 58500 FCC Antenna Restrictions".
The maximum permitted antenna gain depends upon product variant as follows:
•
PTP 58500: 37.7 dB
•
PTP 54500: 34.9 dB

Table 17 - Cable Losses per Length

Length for 1.2dB Cable Loss at 5.8 GHz
(ft)
1.9
4.6
7.25
11.1
16.5
177
10 Connectorized PTP 500 Series Bridge
(m)
0.6
1.4
2.2
3.4
5.0