3
TTA CONTROL via RMC
TTA FAULT
The red LED will light under the following circumstances.
•
The input voltage is outside the normal operating range
•
The internal power rails are outside the normal operating range.
•
The internal amplifier currents are outside the normal operating range.
•
The internal temperature is outside the normal operating range.
AUTO LED
A green LED indicates that the TTA will automatically switch paths if the currently
active path develops a fault.
When off indicates that the user has forced path A or path B and, if a fault occurs,
the TTA will not switch to the other path.
AMP A, AMP B LED
A green LED indicates that either TTA path A or B is currently in service.
If either LED is red a fault has developed in the amplifier.
Both LEDs flashing red indicates that the RMC has lost communications with the
TTA.
TEST LEDs
TERM - A yellow LED indicates that the inputs of the TTA LNA’s are terminated in
50 ohms. The off-air signal is disconnected from the station receivers.
BYPASS - A yellow LED indicates that the RF signal is bypassing the TTA
amplifiers.
TP
►
RX - A yellow LED indicates that the front panel Test Port is connected to the
rear panel RF Input. The off-air signal is disconnected from the station receivers.
SELECT and ENTER Switches
The two SELECT switches move the flashing LED left or right.
The ENTER pushbutton activates the selected function and the LED lights and
stops flashing.
TEST PORTs
With the RMC rear panel Test Port connected to the TTA Test port via a test cable,
a signal injected at the RMC front panel Test Port will appear at the TTA LNA input
with a loss of 30 dB. This enables testing of system sensitivity.
RMC REAR PANEL
FILTER Ports and Switch
Two connectors are provided for the connection of an external post TTA filter. To
route the RF signal through the filter a recessed push-button switch must be
pressed. This switch is located between the FILTER connectors and below the
FILTER LED. The LED will light to indicate the filter is included in the RF signal
path.
