User Manual

Routine Operation 3-3STRATA TX Operator’s Guide/Tech Ref Manual
Figure 3-2: TXU Controls, Indicators, and Connectors - Rear
View
When the TCU and TXU are co-located, MRC recommends both
units be powered from the same DC power source.
If your STRATA TX System does not contain a TCU, the DC ON
COAX switch will not be present and an AUDIO connector will
be mounted in place of the switch.
If your STRATA TX System contains both a TXU and a TCU, the
System gives you several ways to control DC power on the
coaxial cable from the TCU to the TXU, depending on the
configurations of your TCU and TXU:
•The DC ON COAX switch on the front panel of the TCU
(See Figure 3-3 on page 3-6) and the DC ON COAX
switch on the front panel of the TXU (Figure 3-1 on
page 3-2).
RF Output
Connector
RS-232
Connector
•The 75 Ohm Coax option on the Command Screen.
Both control methods must be enabled for DC power to be
operational if your TCU and TXU configurations both contain the
DC ON COAX switches. If the DC ON COAX switch is not
present on your TCU, DC power can only be applied using the
75 Ohm Coax option on the command screen. The TXU DC ON
COAX switch must be set to ON in either situation.
TXU SIGNAL INPUT Connector The BNC INPUT connector
provides the IF or video input to the TXU.
TXU AUDIO Connector AUDIO connectors are not contained
on all configurations of the TXU. For configuration differences,
see Section 2.4 on page 2-9.
If your TXU contains an AUDIO connector, all audio inputs are
applied to the front panel mounted 10-pin connector.
TXU Alphanumeric Display The TXU contains a two-line by
12-character alphanumeric display. The display works in
conjunction with the Control Switch to allow you to monitor
system status and to control system settings.
TXU XMIT LED When the TXU Control Switch is pressed for
one second, the transmitter changes from the standby mode to
the transmit mode or changes from the transmit mode to the
standby mode. When the transmitter is in the transmit mode, the
XMIT LED illuminates blue. When the transmitter is in the
standby mode, the XMIT LED is off.
If your STRATA TX System contains both a TXU and a TCU,
pressing the Control switch on either the TXU or TCU will
change the transmitter to the transmit mode or to the standby
mode. The XMIT LED on both units will be on or off, depending