Restore Web Password To Default; Transistor Aging Adjustment - Hitachi EC702HP Operation Manual

Section 5 - System Operation Manual
(E-Compact ATSC Transmitters - EC701HP thru EC708HP)
5.5.15
To access the Restore Web Password to default screen, select "Yes" by using the keys 
or .
Press key ESC to return to Setup Menu and hit key
5.5.16
In the power amplifiers which compose the HP transmitter family, the module's polarization
setup has influence over the drawer's efficiency.
In the "Power Amplifier Config" menu, it is possible to optimize the polarization parameters to
have coherence between linearity (MER / IMD) and efficiency. This menu should be used to
readjust the currents in the transmitter when it is operational.
See below the parameters that can be modified through this menu and its influence on the
equipment's performance.
Carrier Amplifier Quiescent Current
Peak Amplifier Gate Voltage
Note:
These values can be modified in the factory's menu, although the readjustment command may
be implemented through the user menu. After each modification in the parameters, it is mandatory
to re-do the non-linear precorrection.
Manual Rev. 0.0 - August 2016

Restore Web Password to Default

> >
Select Restore Web Password to default and press ENTER.
The screen below will appear.

Transistor Aging Adjustment

PARAMETER
Drain Voltage

"
RANGE
Increase value
40V 50V
Decrease value
Increase value
0,7A 2,0A
Decrease value
Increase value
0,3V 1,0V
Decrease value
"
to view the next screen.
Action
MER
Improve
Decrease
Improve
Decrease
Improve
Decrease
Result
Efficiency
Decrease
Increase
Decrease
Increase
Decrease
Increase
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