1-12AU7, MPX Oscillator.
1—ST2-275, Voltage Reference.
1—MA113 (Transistor), MPX Indicator Lamp
Switch.
2—Diodes, Wide Band Discriminator
2—Diodes, Narrow Band Discriminator.
4—Diodes, Balanced MPX Detector.
2—Diodes, Balanced Detector for MPX Indi-
cator.
2—Rectifiers, High Voltage Power Supply.
Power Consumption
70 watts, 105 to 125 volts, 50 to 60 cycles.
Dimensions
Front panel 15-3/8inches x 5-1/8 inches; overall
depth of chassis behind front panel, 12-3/16
inches; clearance in front of mounting panel
including knobs, 1-1/2 inches.
Weight
Chassis only, 22 pounds.
In shipping carton, 31 pounds.
FRONT PANEL INFORMATION
Figure 1. MR65B Front Panel.
TUNING DIAL
The tuning dial is calibrated in both
megacycles and a 0-100 logging scale. Tun-
ing back to a particular station is much easier
by keeping a record of the exact station loca-
tion on the logging scale.
METERS
Figure 2. FM Signal Strength Meter.
At the left side of the dial is the FM SIG-
NAL STRENGTH meter. The amount of meter
pointer deflection indicates the relative sig-
nal strength of the station being received.
Use the signal strength meter to correctly
position a directional FM antenna. Maximum
meter deflection for a particular station
occurs when the antenna is pointed in the
direction for best signal pickup.
Figure 3. FM Tuning Meter.
At the right side of the dial is the FM TUN-
ING meter. An FM station is correctly tuned
when the meter pointer is within the black
area at the center of the meter scale. Both
meters can be adjusted for proper zero set-
tings if necessary. (See section titled AD-
JUSTMENTS.)
MULTIPLEX STEREO INDICATOR
At the center of the tuning dial is the
multiplex stereo (MPX) indicator. The indi-
cator lights (red) MPX whenever the dial
pointer crosses a station broadcasting multi-
plex stereo. The indicator lights ONLY on the
19KC multiplex carrier present in a multi-
plex stereo broadcast. The indicator will
NOT light on noise or interference signals.
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Summary of Contents for MR65B
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