User's Manual

Manual 7-9375-4 Page 13TX RX Systems Inc. 10/29/04
2) The spectrum analyzer is connected to the -30
dB signal sampler port following the final output
amp. This port will allow the observation of the
amplifier output at a considerably reduced out-
put level. This decoupling value (-30 dB) needs
to be added to any measured signal value in
order to arrive at the actual signal level.
3) With a spectrum analyzer connected to the sig-
nal sampler port (see
Figure 9
), have person-
nel with handheld radios move to several
predetermined points and key their radios.
Record the level of these signals as observed
on the analyzer and also record the location of
the person transmitting. In this way, a map of
the systems performance can be generated.
4) For signals coming from a fixed antenna or sta-
tion, record the level of all the desired incoming
signals for future reference.
MAINTENANCE AND REPAIR
Signal boosters manufactured by TX RX Systems,
Inc. can perform for years with little maintenance
and repair. However, if the amplifiers are subjected
to excessively high signal levels, power surges or
lightning strikes, failures may occur. The following
procedures may be followed for detecting a mal-
functioning unit or as part of a periodic mainte-
nance program.
1) The heatsink area should be cleared of dust
and debris.
2) Inspect the unit to see that the two power sup-
ply LED DC indicators are lit (remove any dust
or debris that may obscure the LEDs). This will
verify that DC power is flowing properly. Check
all hardware for tightness.
3) Compare system performance to initial perfor-
mance levels measured when the system was
first installed. The lack of signal can be traced to
a malfunctioning amplifier by progressive signal
monitoring from the output (far end) to the input
end of the system noting the area where the
Boosted
RF Signal
Signal Distribution System
Spectrum
Analyzer
10 dB Pad
Sam
ple
Sample
Test Port
Test Port
Figure 9
: Methodology for doing a performance survey of the signal distribution system.
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