User's Manual

61-89A-50-A18-G1-UserMan page 15 of 20
TX RX Systems Inc. Manual 7-9352 (version 4) 01/27/04 Page 15
condition. Fault conditions occur when the current
draw exceeds +/- 30% or the amplifiers operating
temperature exceeds 80° Celsius. The power
amplifiers do not have a warning state.
The power supply LED indicators are located on
display panel next to the menu selection buttons
and are also dual color. Green representing normal
operation and red a fault condition. A fault condition
for the +24 VDC supply occurs whenever the volt-
age potential drops below +16 VDC (30% below
nominal). Likewise, a fault for the +12 VDC supply
occurs when the potential is below +8 VDC (30%
below nominal).
FORM-C CONTACTS
Form-C contacts are available inside the cabinet
next to the power supply assembly, see figure1.
These screw terminals are intended for connection
to the customers supervisory alarm or data acqui-
sition system. One set of terminals is notification of
any alarm condition occurring and the second set
of contacts indicate the system is operating on bat-
tery backup power.
PERFORMANCE SURVEY
It is a good idea to document the performance of
the system after installation so that a reference
exists for future comparisons. This information can
make troubleshooting an interference problem or
investigation of a complaint about system perfor-
mance much easier. If there are coverage prob-
lems with a system, this survey will usually reveal
them allowing corrective measures to be taken
before the system is put into routine use. The fol-
lowing is an outline of how to do such a survey.
Because the nature of each installation can be
quite different, only a broad outline is given.
1) Measure the gain of the signal booster being
careful not to exceed the maximum input level.
Figure 7
shows this being done using a signal
generator and spectrum analyzer. This is basi-
cally a substitution measurement. Record the
measured values for each passband.
Test Po
rt
Test Port
Signal
Generator
Zero
Reference
Spectrum
Analyzer
10 dB Pad
Gain
Figure 7
: Test equipment interconnection for measuring signal booster gain.