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 Routine Operation
3-15
STRATA TX Operator’s Guide/Tech Ref Manual
If the TXU is powered from a source other than an 
ACU, turn that power source on.
4.
Set the TXU PWR switch to I (on). 
5.
The normal power-up sequence is as follows:
-
The Status LED above the PWR switch should 
illuminate and should change colors from red, to 
green, to amber, and finally remain green. 
-
The alphanumeric display should light up and quickly 
display a self-test screen, then the version of the 
installed firmware, and finally the Main Screen. 
Some typical screens are shown in 
. The 
exact screens will vary depending on installed 
hardware.
-
The TXU will typically power up using the last settings 
in use when power was turned off.
-
If the TXU does not power up normally, refer to the 
Figure 3-11: Typical TXU Power Up Screens - Single TXU
STRATA TX
V X.X.X
Preset 1
0.00W
Radio Version
Main Screen
Power Down  
1.
Set the TXU PWR switch to 0 (off).
2.
If the TXU is powered from the optional ACU, set the 
ACU power switch to (off).
If the TXU is powered from a source other than an 
ACU, turn that power source off.
3.3.6
TXU and TCU Power Up and Power Down - 
Co-Located
If your STRATA TX System consists of a co-located TXU and a 
TCU, it is recommended that both the TCU and TXU be powered 
from the same DC power supply in lieu of using superimposed 
DC power on the coaxial cable between the TCU and the TXU. 
Note
The following procedure reflects use of a single DC 
power source for both the TXU and TCU in lieu of 
using superimposed DC power on the coaxial 
cable between the TCU and the TXU.
Perform the following steps to power up or power down a co-
located TX System:
CAUTION
To avoid possible damage, turn off DC 
Power on the coax before connecting any 
test equipment.