User's Manual

60/346 Issue 01 - April 2001 - Draft 04 3CC12426AAAA TQ BJA 01
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where
Loss
total
is the loss of the IF cable run in dB/100 m (dB/100 ft)
Loss
i
is the loss of the indoor-rated cable (in dB)
Loss
o
is the loss of the outdoor-rated cable (in dB)
Loss
i connector
is the loss of the indoor cable connector (in dB)
Loss
o connector
is the loss of the outdoor cable connector (in dB)
After all components have been installed and connected, system loss measurements and calibration
must be made to determine the actual losses. If the measured loss is greater than the required loss,
different cable types may be necessary. If the measured loss is less than the required value, attenuators
should be added between the 12:2 Combiner/Splitter and the Bias-T. See chapter 11 for measurement
and calibration procedures.
Table 19: BS passive device and IF cable losses
Note:
(1)
Measured at 2050 MHz.
(2)
Measured at 900 MHz.
(3)
The values given are for the sum of the indoor and outdoor cable runs, excluding the outdoor
IF jumper cable. The values include four connectors, two for the indoor cable and two for the
outdoor cable.
BS component
Total
downstream
loss (1) (dB)
Total
upstream
loss (2) (dB)
Fixed loss requirement 27 24
Component SMA jumper cable (3 m [10 ft]) 1.0 1.0
Tx 12:2 Combiner/Splitter 17.10 N/A
Rx 12:2 Combiner/Splitter N/A 17.10
Bias-T 1.03 1.03
Lightning arrester 0.20 0.20
Outdoor IF jumper cable (including con-
nectors)
0.3 0.3
Total loss due to all components except IF cables 19.63 19.63
Loss available for IF cable
(3)
(fixed loss requirement minus total
component loss)
7.37 4.37