d.
With the DISPERSION RANGE in the MHz/DIV posi-
tion,
adjust the IF CENTER FREQ-CAL for minimum signal
shift
as the DISPERSION is switched through the MHz (10
MHz
- .2 MHz) positions.
e. Return the DISPERSION to the 5 MHz/div position.
Position the signal to the graticule center with the Horizontal
POSITION control. If the signal is more than 1 division
from the sweep center, it will be necessary to adjust the
internal Sweep Center adjustment R203. See Calibration
section.
3. DISPERSION-BAL Adjustment
a. Preset the front panel controls as follows:
IF CENTER FREQ and
000 (centered)
FINE
DISPERSION RANGE
MHz/DIV
DISPERSION
5 MHz/div
b. Tune the RF signal to the screen center.
c. Adjust the DISPERSION BAL for minimum signal shift
b. Tune for minimum signal shift as the DISPERSION
as the DISPERSION RANGE switch is switched between the
RANGE is switched from MHz/DIV to kHz/DIV positions.
MHz/DIV and kHz/DIV positions. (Start the balance adjust-
ment with the DISPERSION selector in the 5 MHz position,
c. With the DISPERSION RANGE selector at MHz/DIV
then decrease the dispersion to the .2 MHz-20 kHz position
position, adjust the IF CENTER FREQ control for minimum
for the final adjustment.)
signal shift as the DISPERSION control is switched through
the 10 to .2 MHz positions.
NOTE
d. Center the signal with the Horizontal POSITION con-
trol and check the position of the signal on the sweep. The
If the dispersion balance can not be achieved
signal should locate near the center of the sweep with the
with the above procedure, the instrument requires
sweep extending over the 10 division width of the graticule.
i n t e r n a l a d j u s t m e n t . Refer to the Calibration sec-
tion of the manual.
If calibration is required, proceed with the following
adjustments.
NOTE
4. DISPERSION-CAL Adjustment
These adjustments interact, and must be performed
in sequence.
a. Preset the front panel controls as follows:
000 (centered)
I F CENTER FREQ
2. IF CENTER FREQ-CAL Adjustment
MHz/DIV
DISPERSION RANGE
a. Center the IF CENTER FREQ controls, the DISPERSION
1 MHz/div
DISPERSION
BAL and the IF CENTER FREQ-CAL adjustments. Set the
SQ LAW
VERTICAL DISPLAY
DISPERSION RANGE to MHz/DIV and the DISPERSION
selector to 5 MHz/div position.
Band B
RF Input Selector
b. Apply a stable RF signal to the appropriate RF INPUT
Just out of the OFF
I N T REF FREQ
connector; then tune to the signal frequency with the RF
detent
CENTER FREQUENCY control. Adjust the GAIN control for
a signal amplitude of approximately 6 divisions.
b. Connect the 1 MHz MARKERS OUT signal through a
coaxial cable to the band B RF INPUT connector.
c. Adjust the RF CENTER FREQUENCY and the FINE RF
CENTER FREQ controls for minimum signal shift as the DIS-
c. Tune the RF CENTER FREQUENCY control to align the
PERSION RANGE is switched between the MHz/DIV and the
tunable markers to the fixed marker signals.
kHz/DIV position.
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