Operating Manual

6 pX2 Gen2 Operating Manual
WARNING:
To satisfy FCC RF exposure
requirements for mobile
transmitting devices, a separation
distance of 25 cm (38cm
collocated with LTE module) or
more should be maintained
between the antenna of this
device and persons during device
operation. To ensure compliance,
operations at closer than this
distance is not recommended.
The antenna used for this
transmitter must not be co-
located in conjunction with any
other antenna or transmitter.
WARNING:
Direct human contact with the
antenna is potentially unhealthy
when the pX2 Gen2 is generating
RF energy. Always ensure that
the pX2 Gen2 equipment is
powered down during
installation.
WARNING:
Never work on an antenna
system when there is lightning in
the area.
3.2.2 Installing External Cables, Antennas and Lightning
Arrestors
Never work on an antenna system when there is lightning in the area.
Direct human contact with the antenna is potentially unhealthy when the
pX2 Gen2 is generating RF energy. Always ensure that the pX2 Gen2
equipment is powered down during installation. At all times a distance of
23 cm must be maintained between the antenna and any person when the
device is in operation.
Surge Arrestors
The most effective protection against lightning is to install two lightning
(surge) arrestors, one at the antenna, the other one at the interface with the
equipment. The surge arrestor grounding system should be fully
interconnected with the transmission tower and power grounding systems to
form a single, fully integrated ground circuit. Typically, both ports on surge
arrestors are N-female.
External Filter
Although the pX2 Gen2 is capable of filtering out RF noise in most
environments, there are circumstances that require external filtering.
Paging towers and cellular base stations in close proximity to the pX2 Gen2
antenna can desensitize the receiver. Microhard Systems’ external cavity
filter eliminates this problem. The filter has two N-female ports and should
be connected in line at the interface to the RF equipment.
Weatherproofing
Type N and RTNC connectors are not weatherproof. All connectors should
be taped with rubber splicing tape (weatherproofing tape), and then coated
with a sealant.
Cabling
The following coax cables are recommended:
Table 3 Cable Loss
Cable Loss (dB/100ft)
LMR 195 10.7
LMR 400 3.9
LMR 600 2.5
Factors to take into consideration when choosing a cable are:
 price;
 bend radius limitations (the lower performance cables generally can bend
more sharply)
 performance requirements; and,
 distance between the equipment and the antenna.