2. Set front panel GAIN control fully counterclockwise
(but not to Off), the INTENSITY control fully clock-
wise, and the POWER LEVEL switch to PREAMP
(fully clockwise).
3- Depress front panel STEREO pushbutton.
4. Using the front panel HORIZONTAL and VERTICAL
controls, move the spot of light to the center of the
screen, directly behind the 3 in the LEVEL column.
5. Select a mono signal source.
6. Adjust top panel LEFT AUDIO TRIM and RIGHT AUDIO
TRIM to the midpoint in their clockwise travel.
7. Adjust front panel GAIN to obtain a 1- to 2-inch
pattern, and re-adjust both top panel AUDIO TRIM
controls to obtain a pattern similar to Fig. 9.
FIG. 9 STEREO DISPLAY OF A MONO SIGNAL
By adjusting the display within the L + R guide,
the display is balanced for equal amplitude left and
right channels.
8. Adjust intensity control for a comfortable brightness.
9, Adjust top panel FOCUS control for clearest trace.
10- Set the top panel TRIGGER SOURCE switch to LEFT.
11. Depress the front panel L button.
12. Depress the front panel SWEEP FREQUENCY 20-200
button.
13. Adjust the front panel SWEEP control to the approxi-
mate midpoint of its range.
14. Adjust the top panel SWEEP EXPANSION control to
obtain the pattern shown in Figure 10. The control
should position near the 1 marking.
15. Depress the front panel R button. Determine that the
pattern is similar to that obtained in Fig. 10.
16. Depress both front panel L and R buttons.
17. Adjust top panel TRACE SEPARATION to obtain the
pattern shown in Figure 11.
FIG. 11 DUAL T R A C E DISPLAY
18. Depress the front panel LEVEL button.
19. Adjust the front panel POWER LEVEL knob to obtain
the pattern shown in Figure 12.
FIG. 12 LEVEL DISPLAY OF L & R CHANNEL
20. Depress the front panel MULTIPATH button.
21. Observe that the spot of light is at the bottom center
of the screen.
22. Adjust top panel SIGNAL STRENGTH control to posi-
tion the spot above the horizontal centerline of the
screen: (If the spot of light moves downward as
the top panel SIGNAL STRENGTH control is adjusted,
set the top panel MULTIPATH POLARITY switch to
its opposite setting.)
23. Adjust the top panel DEVIATION control to obtain
the pattern shown in Figure 13.
HOW
to use the MPI
4
MULTIPATH MODE
Multipath is caused by an FM signal arriving at your an-
tenna by two (or more) paths, a direct one between an FM
FIG. 10 SINGLE T R A C E D I S P L A Y
10