Assembly Instructions Chapter 3

4-6 kW UHF Translator Chapter 3, Installation and Setup Procedures
837B, Rev. 0 3-9
Automatic. Automatic operation of the
Exciter uses the Video Input to the
Exciter as an Operate/Standby Switch.
In Auto, if the Input Video is lost, the
Exciter automatically reverts the
Translator to Standby and when the
Video Signal is restored, the Exciter will
automatically return the Translator to
Operate.
Move the Operate/Standby switch on
the UHF exciter tray to Operate.
Observe the power supply reading,
>+30 VDC(+32 VDC), on the front
panel of the UHF amplifier trays. If
present, the (Optional) External
Exhaust Fan on the roof of each
Amplifier Array Cabinet will operate.
Note: If the translator does not
switch to Operate when the
Operate/Standby switch is placed
in Operate, check that an external
interlock plug, with a jumper wired
from pins 1 to 2, is connected to
jack J7 on (A9) the A/V input and
remote interface assembly.
Observe the Front Panel Meter located
on the Metering Panel with the switch
in the Combined Visual Output Power
position, it should read 100%. If
needed, adjust the Power Adjust
screwdriver pot located on the front
panel of the UHF Exciter to attain 100%
Output on the Front Panel Meter
located on the Metering Panel with the
switch in the Combined Visual Output
Power position.
As you are checking the output Power
Level, check the Meter Readings on the
Metering Panel in the % Reflected
Power Position for the Side A and also
the Side B Amplifier Assemblies and the
Combined position for the Translator.
If the % Reflected Power for any of the
readings is very high, above 20%, a
problem with the Output Coaxial Lines
in the problem Side Amplifier Assembly
or in the Output Lines for the System is
present and needs to be checked and
corrected. A center bullet missing from
the 1-5/8" or 3-1/8" Rigid Coax Lines
or loose bolts on the connections can
cause this problem.
Observe the % Exciter Power reading of
the Meter on the Exciter, it should read
the same as written on the Test Data
Sheet for your Translator. Move the
Operate/Standby Switch, located on
the Exciter, to Standby.
The Gain and Phase controls located on
the front panels of the individual UHF
Amplifier Trays were adjusted at the
factory to attain 100% Output of the
Translator and should not need
readjusted. The Forward Meter
readings for Side A and for Side B may
not be the same but should be the
same as, or close to the values written
on the Test Data Sheet for your
Translator. Side A and Side B are
combined to give the correct Peak of
Sync Output, which is 100% in the
Combined Visual position.
The readings on each of the individual
UHF Amplifier Trays may not be the
same. Refer to the Test Data Sheet for
your Translator and compare the final
readings from the Factory on the Test
Data Sheet with the readings on each
of the Trays after the Set Up. They
should be very close to the same. If a
reading is way off, refer to the Phasing
and Power Adjustment Procedure for
the UHF Amplifier Trays in the Detailed
Alignment Procedure before trying to
adjust.
If a dummy load is connected to the
Translator, switch the Translator to
Standby and switch Off the Main AC
Circuit Breakers found on the AC
Distribution Panels in each Cabinet.
Remove the dummy load and make all
connections needed to connect the
Translator to the Antenna for your
System. Switch the Main AC Circuit
Breakers On and the Operate/Standby
Switch to Operate. Adjust the Exciter
Power Adjust pot to attain 100%
Combined Output.