User's Manual

Manual 7-9375-4 Page 12TX RX Systems Inc. 10/29/04
The LED indicators for the power amplifiers are
located on the display panel next to the menu
select buttons and are dual color LED’s. Green rep-
resents NORMAL operation while red indicates a
FAULT condition. Fault conditions occur when the
current draw exceeds 900 ma or falls below 200
ma. Also, whenever the amplifiers operating tem-
perature exceeds 95° Celsius. The power amplifi-
ers 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 figure 2.
These screw terminals are intended for connection
to the customers supervisory alarm or data acqui-
sition system. One set of terminals supplies notifi-
cation of any alarm condition occurring and the
second set of contacts indicate the system is oper-
ating on battery 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 8
shows this being done using a signal
generator and spectrum analyzer. Record the
measured values for each passband. We rec-
ommend that a 50 ohm load be connected to
the unused RF port on the bottom of the cabinet
during the gain test.
Signal
Generator
Zero
Reference
Spectrum
Analyzer
Gain
Sample
Sample
Test Po
rt
Test Port
Figure 8
: Measuring signal booster gain.
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