Data Sheet Chapter 5

4-6 kW UHF Translator Chapter 5, Detailed Alignment Procedures
837B, Rev. 0 5-12
adjusted for the frequency of the
correction notch being applied to the
visual response of the translator.
R103 and R106 are used to adjust
the depth and width of the correction
notch.
Controls R13, R18, and R23, the
magnitude controls, should be set fully
CW. Controls R34, R37, and R40 are the
linearity cut-in adjustments.
5.3.10 (A11) UHF Upconverter Board
(1265-1310; Appendix D)
To align (A11) the UHF upconverter
board, place W1 on J10 in the Manual
position. R10 is a gain control that is
adjusted to give a maximum output of
approximately +17 dBm at J5 of the
board with an input of 0 dBm of IF.
5.3.11 (A14-A1) Channel Oscillator
Board (1145-1201; Appendix D)
The (A14-A1) channel oscillator board is
mounted in (A14) the channel oscillator
assembly. To align this board:
1. Connect J1, the main output of the
channel oscillator, to a spectrum
analyzer tuned to the crystal
frequency. Peak the tuning
capacitors C6 and C18 for
maximum output. Tune L2 and L4
for maximum output. The output
level should be about +5 dBm. The
channel oscillator should maintain
an oven temperature of 50° C.
If a spectrum analyzer is not
available, connect a digital
voltmeter (DVM) to TP1 on the x8
multiplier board. Tune capacitors C6
and C18 for maximum voltage and
tune L2 and L4 for maximum
voltage output at TP1.
2. Connect J2, the sample output of
the channel oscillator, to a suitable
counter and tune C11, coarse
adjust, to the crystal frequency.
Tune C9 for the fine-frequency
adjustment.
Caution: Do not repeak C6, C18, L2,
or L4. This can change the output
level.
Note: While adjusting C9 and C11 to
the crystal frequency, the peak
voltage monitored at TP1 of the x8
multiplier board should not decrease.
If a decrease does occur, there may
be a problem with the crystal.
Contact the Axcera Field Service
Department for further instructions.
Note: If the VCXO oscillator in the
channel oscillator assembly is used,
the C9 fine-frequency adjust is not
on the channel oscillator board. It
can be found on the FSK w/EEPROM
board by using R9.
3. Reconnect J1, the main output of
the channel oscillator, to J1, the
input of the x8 multiplier.
5.3.12 (A15-A1) x8 Multiplier Board
(1227-1002; Appendix D)
The (A15-A1) x8 multiplier board is
mounted in an x8 multiplier enclosure
assembly. During normal operation, the
green LED DS1, which can be seen
through the access hole in the enclosure
assembly, will be lit to indicate that the
LO is present at the output of the x8
multiplier board.
Connect a spectrum analyzer to output
jack J2 of the board.
Tune C4, C6, C10, C12, C18, and C20 for
maximum output.
Readjust all of the capacitors to minimize
the seventh and the ninth harmonics of
the channel oscillator frequency. They
should be at least -30 dB down without
affecting the x8 multiplier output.
If a spectrum analyzer is not available, a
DC voltmeter can be used. When a
voltmeter is used, the harmonic