3-5
STRATA TX Operation Guide
400
Rev.
DC Superimposed Voltages
Powering the STRATA Transmitter
2.6.3
DC Voltage Settings – Over-Ride Switch Models
If you are unsure which model transmitter you are using, see "
Model
Variations," Section 3.3 on page 3-1
.
On system configurations where the DC voltage is superimposed, DC
Voltage can be turned on or off between the TCU and TXU, and
between the TXU and HPU. On models equipped with DC override
switches, DC voltage can be turned on or off using one of two methods:
• Use the front panel menus as described in "
DC Voltage Settings –
Non Over-Ride Switch Models," Section 3.6.1 on page 3-4
.
• Use the override switches found on the front and rear panel of the
TXU and the rear panel of the TCU. For the switch locations on the
TXU and TCU, refer to:
–
Figure 3-2, TXU with DC Override Switches on page 3-1
–
Figure 3-4, TCU With DC Over-ride Switch on page 3-2
Warning:
DC voltage superimposed
with the IF or RF signal may cause
damage to test equipment. Turn off
DC voltage before troubleshooting
the transmitter.
2.6.3.1
Override Switch Settings
DC Override Switches are located on the TXU front and rear panel
along with the TCU rear panel.
Figure 3-8
shows the switch setting for
the on and off positions.
Figure 3-8 DC Override Switch ON/OFF Settings
“OFF” Position
“ON” Position
2.6.4
DC Override Switch Settings
Table 3-3
describes the DC Override switch settings for systems using TXU, TCU, and
HPU units.
Table3-3
DC Override Switch Settings
System
Configuration
TCU
TXU
TCU
Menu
“75 Ohn
Coax”
TCU
Rear Panel
Override
Switch
TXU
Menu
“HPU
Coax”
TXU
Front Panel
Override
Switch
TXU
Rear Panel
Override
Switch
TCU, TXU, and HPU
powered from TCU
ON
ON
ON
ON
ON
TCU, TXU, and HPU
powered from TXU
ON
ON
ON
ON
ON
TCU, TXU, and HPU
powered separately
OFF
OFF
ON
OFF
ON
TCU and TXU
powered from TCU
ON
ON
ON
ON
OFF
TCU and TXU
powered from TXU
ON
ON
ON
ON
OFF
TCU and TXU
powered separately
OFF
OFF
OFF
OFF
OFF
TCU Stand-alone
OFF
OFF
–
–
–
TXU Stand-alone
–
–
OFF
OFF
OFF