Specifications

CONNECTING TO ALL OTHER TUNERS
Connect a low-loss shielded cable from the
input to the first FM limiter through a 100 K
resistor, to the Signal Strength (vertical)
Input on the MI-2.
Connect a low-loss shielded cable from the
discriminator output (ahead of the de-
emphasis network) to the Deviation (hori-
zontal) Input on the MI-2.
OPERATING INSTRUCTIONS
MULTIPATH AND TUNING INDICATION
1. Turn the MI-2 power switch to ON.
2. Turn the SCOPE TEST switch to TEST.
3. Adjust the HORIZONTAL POSITION front
panel control until the trace dot is cen-
tered horizontally on the indicator screen.
Calibration lines are provided on the indi-
cator face for centering purposes.
4. Adjust the VERTICAL POSITION front
panel control until the trace dot is posi-
tioned at the bottom center of the vertical
scale (See Figure 17.)
5. Adjust the INTENSITY and FOCUS con-
trols for a sharp and clear trace dot.
6. Turn the SCOPE TEST switch to MULTI-
PATH position.
7. Turn the tuner tuning dial to the desired
FM station, either stereo or monophonic.
8. Observe the trace pattern on the MI-2
Indicator screen. If the pattern is uniform
and relatively smooth, little or no multi-
path is present. If the pattern is irregular
with vertical traces, multipath is present.
The average height of the trace above the
base line indicates the relative signal
strength of the station being received.
9. Rotate the tuner antenna, while watching
the MI-2 Indicator screen. Stop the an-
tenna in the position where the trace is the
smoothest curve. In this position there is
the least multipath.
TYPICAL INDICATIONS
The 19KC carrier from a station broad-
casting multiplex stereo will keep the Indi-
cator trace from closing down to a dot with
no station modulation.
You may notice that Multipath is almost
independent of the strength of the incoming
signal. Strong local stations can be as critical
as distant stations with respect to Multipath.
11
Figure 17. Trace Dot Positioned at Bottom
Center of Vertical Scale.
Figure 18. Uniform and Relatively Smooth Trace
With Little or No Multipath Present (80% Modulation).