TX RX Systems Inc. Manual 7-9487-3 05/05/11 Page 31
Amplifier Monitoring
The system continuously monitors the current
being drawn by the amplifiers and reveals the sta-
tus of the amplifiers in three ways: LCD Display,
front panel LED’s and Form-C contacts (“screw ter-
minals”).
Table 7
summarizes the status of the
LED’s and Form-C contacts for various amplifier
conditions.
LCD Display
The LCD display provides extensive status infor-
mation through the menu system including the cur-
rent draw of all amplifiers, connection of the test
transmission line, the tower top box temperature,
and installed software version level.
CURRENT DRAW
Typical displayed values for each of the system
amplifiers are listed in
Table 8
. The current value
for any amplifier can be read from the display by
using the ARROW buttons to scroll down from the
default display. The A and B tower top amplifiers
current draw are shown on one menu display and
the BASE amplifier current draw on another.
TTA TEMPERATURE
The temperature of the tower top box can be read
from the display by using the ARROW buttons to
scroll down from the default display to the TEM-
PERATURE sub-menu. The recommended normal
operating temperature range for the tower top box
is -30 to +60 degrees Celsius. The tower top ampli-
fier will function up to +70°C without shutting down.
However, the specifications are not guaranteed.
SOFTWARE VERSION
There are micro-controllers located in both the
tower top box as well as the base unit so there are
two software versions in the system. Both the
Status LED
Possible Amplifier Status
Form-C Contact Status
Tower top Amplifier A
Green
Selected; normal current
Normal
Off
Not selected; normal current
Normal
Red
Failure: Very abnormal current; can only be selected if amplifier B is
also in Alarm
Alarm contacts change state
Red
Failure: Extremely abnormal current; cannot be selected
Alarm contacts change state
Tower top Amplifier B
Green
Selected: normal current
Normal
Off
Not selected; normal current
Normal
Red
Failure: Very abnormal current; can only be selected if amplifier A is
also in Alarm
Alarm contacts change state
Red
Failure: Extremely abnormal current; cannot be selected
Alarm contacts change state
Base (Distribution) Amplifier
Green
Normal current
Normal
Red
Failure: Very abnormal current
Alarm contacts change state
Table 7:
Amplifier status troubleshooting guide.
Amplifier
Displayed Value
TTA Amp A
~ 600 ma
TTA Amp B
~ 600 ma
Base Amp
(MCU system only)
~ 850 ma
Table 8:
Typical current readings.
