P
P
E
E
S
S
1
1
9
9
0
0
0
0
G
G
i
i
G
G
S
S
M
M
R
R
e
e
p
p
e
e
a
a
t
t
e
e
r
r
PES1900NR Operations Manual
Chapter 3. Mounting the Antennas — 35
Sweeping the Antenna Cables
Sweep testing of the installed feedlines and antennas is recommended. Sweep testing is the same as
performed at a base station. Measurement of impedance match and insertion loss over the operating
frequencies insures that the antenna system is installed properly and is ready to perform.
Most wireless operating companies have developed their own performance standards for antenna
systems. Use such standards if available. If company standards are not available, consider the
following:
Sweep frequency range: 1850 ~ 1990 MHz or across network operating bands
Impedance Match: 17dB Return Loss or 1.33:1 VSWR or better
Insertion Loss: 3 dB maximum or per calculated.
Distance to Fault, DTF: Measure Return Loss of the antenna system components and isolate
troubles.
If the impedance match or insertion loss is not met, troubleshoot the feedlines and antennas for the
source of the problem. Use the “Distance to Fault” function to assist in localizing the trouble. Correct
as required before proceeding.
Antenna Alignment
Cell Site Antenna – toward Donor Cell Site
To initially orient the Cell Site (BTS, RBS) antenna:
1. Connect the GSM receiver to the coaxial cable from the antenna facing the donor cell site.
2. Monitoring the channels assigned to the cell site, position the cell site antenna to maximize the
RSL (Received Signal Level).
3. Analyze the signal to ensure that it conforms to project design specifications. Consult your site
plan or network administrator for more information.
4. Record the power level and frequency of the control channel and other active carriers from the
cell site for later reference:
Power Level _____ dBm
Frequency ______ MHz or Channel Number __________
If the Donor BTS, RBS RSL is less than
Maximum RF Output Power Level
minus
Maximum Gain
,
then full repeater output power may
not
be reached when installed. To correct the problem,
reposition the antenna, change the mounting height of the antenna, or use an antenna with
greater gain to reach the required RSL.
Service Antenna – toward coverage area
To initially orient the Mobile or Service Antenna:
1. Aim the antenna’s radiation pattern center toward the intended area to be covered or per azimuth
and elevation instructions on the site plan.
2. Installation location may need adjustment if isolation objective is not met.
3. Coverage optimization is performed after the repeater is activated.