Data Sheet Chapter 5

4-6 kW UHF Translator Chapter 5, Detailed Alignment Procedures
837B, Rev. 0 5-2
(A10-A1) the Downconverter/Filter
Board.
5.0.4 (A4) Channel Oscillator
Assembly, Dual Oven (1145-1202;
Appendix D)
Contains: The Channel Oscillator Board,
Dual Oven (1145-1201).
1. Connect the main output of the
Channel Oscillator (J1) to a
spectrum analyzer, adjusted to
view the crystal frequency.
Peak the tuning capacitors C6 and
C18 for maximum output. Then
tune L2 and L4 for maximum
output. The output level should
be approximately +5 dBm and the
Oven Temperature should be
maintained at 50°C.
If a spectrum analyzer is not
available, connect a DVM to TP1
on the x8, x4 or x2 Multiplier
Board. Tune capacitors C6 and
C18 for maximum voltage at TP1.
Then tune L2 and L4 for maximum
voltage at TP1.
2. Connect the sample output of the
Channel Oscillator at J2 to a
suitable counter and tune C11,
Coarse Adjust, and C9, Fine
Adjust, to the crystal frequency.
Do not re-peak C6, C18, L2 or L4
because this may change the
output frequency.
Note
: While adjusting C9 and C11 to the
crystal frequency the peak voltage
monitored at TP1 of the Multiplier
Board should not decrease. If a
decrease does occur a problem
with the crystal is likely.
3. Reconnect the main output at J1
of the Channel Oscillator to the
Input Jack J1 of the Multiplier
Board.
Note
: If the Optional Frequency
Correction Kit is purchased a VCXO
Assembly (1145-1206), containing
a VCXO Board (1145-1204), will be
used instead of the standard
Channel Oscillator Board. The
adjustment will be the same as
above except that the frequency is
adjusted by moving the Jumper
W1 on Jack J6, located on the IF
PLL Board (1109-1002), to Pins 2
& 3, Fixed Bias, and adjusting R15
on the IF PLL Board for -3 VDC at
FL2 of the VCXO Assembly. Move
the Jumper W1 on Jack J6 to
between Pins 1 & 2, AFC. Connect
the Oscillator Sample output, at
(J2) of the Channel Oscillator or
the Front Panel Sample Jack (J9),
to a suitable Frequency Counter
and tune C11, Coarse Adjust, to
the desired frequency. Do not
re-peak C6, C18, L2 or L4 because
it may change the output
frequency.
Reconnect the main output (J1) of
the Channel Oscillator (+5 dBm) to
the input (J1) of the Multiplier
Board. DS1 the Red Unlock
Indicator, located on the IF PLL
Board, should not be lit.
5.0.5 (A5-A1) x8 Multiplier Board
{(1227-1002), x4 Multiplier Board
(1227-1525) or x2 Multiplier Board
(1227-1524); Appendix D}
Mounted in (A5) a Multiplier Enclosure
(1265-1125).
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 L.O. is
present at the output of the x8 Multiplier
Board.
1. Connect a Spectrum Analyzer to
the Output Jack (J2) of the board.
2. Tune C4, C6, C10, C12, C18 and
C20 on the x8 and the appropriate
caps on the other boards for
maximum output. Readjust all the