Data Sheet Chapter 5

4-6 kW UHF Translator Chapter 5, Detailed Alignment Procedures
837B, Rev. 0 5-14
5.4.3 (A1) UHF Filter (1007-1101;
Appendix D)
Apply a multiburst test signal to the
translator. Monitor J2 with a spectrum
analyzer and tune C1 and C3 for peak
output with a flat-frequency response.
There is approximately 1 dB loss through
the filter.
5.4.4 (A4-A1) 40-Watt Amplifier
Module, (51-5379-308-00;
Appendix D)
The module is part of the 40 Watt UHF
amplifier assembly (1206693).
Gain adjustment (for the complete
amplifier), as well as quiescent current
setting by means of potentiometers
R807 and R808, is factory implemented
and should not be altered.
5.4.5 (A4-A2) Coupler Board
Assembly (1227-1316; Appendix D)
There are no adjustments to this board.
5.4.6 (A4-A3) LDMOS Amplifier
Module, (51-5379-309-00;
Appendix D)
The module is part of the LDMOS
amplifier assembly (1301556).
The working point setting is factory
implemented by means of
potentiometers R9, R11 and R12 and
should not be altered.
5.4.7 (A5-A1) 4-Way Splitter
Assembly (1301580; Appendix D)
There are no adjustments to this
assembly.
5.4.8 (A5-A2, A5-A3, A5-A4 & A5-
A5) LDMOS Amplifier Modules,
(51-5379-309-00;Appendix D)
Each module is part of a LDMOS
amplifier assembly (1301556).
The working point setting is factory
implemented by means of
potentiometers R9, R11 and R12 and
should not be altered.
5.4.9 (A5-A6) 4-Way Combiner
Assembly, (1301557, low
band/1301558, mid band/1301559,
high band; Appendix D)
This assembly contains (A5-A6-A1) a 4-
way combiner board. There are no
adjustments to the board.
5.4.10 (A5-A6-A2) Circulator
There are no adjustments to the
circulator.
5.4.11 (A6-A1) Dual Peak Detector
Board (1227-1333;Appendix D)
This board is mounted in (A6) a Dual
Peak Detector enclosure (1227-1317).
There are no adjustments to this board.
5.4.12 (A7) Amplifier Protection
Board (1207117;Appendix D)
There are no adjustments to this board.
5.4.13 (A8) Amplifier Control Board
(1265-1414;Appendix D)
To check the operation of the overdrive
circuit, increase the gain pot of the UHF
amplifier tray to approximately 110%.
The Overdrive LED DS2 should light and
the output power should not increase
above the 110% level. If the LED does
not light, adjust the overdrive threshold
as needed.
5.4.14 (A12) +32V/2000W
Switching Power Supply
This switching power supply does not
contain any customer repairable items. If
the power supply should malfunction, do
not attempt to repair the power supply
without first consulting the Axcera Field
Support Department. The power supply
is adjusted to provide an output of +32
VDC.