Page 2
GENERAL
DESCRIPTION
THANK YOU for
purchasing this Ml 3. To
insure your enjoyment
please read this manual
carefully and follow
instructions.
CONTENTS
GENERAL DESCRIPTION 1
TECHNICAL DESCRIPTION 2
SPECIFICATIONS 3
FRONT PANEL INFORMATION 4
BACK PANEL INFORMATION 5
CABINET INSTALLATIONS 6
CONNECTIONS 7, 8
SET UP PROCEDURES 9
SYSTEM HOOK UP 10
TYPICAL PATTERNS 11
GUARANTEE 12
The Mclntosh Ml 3 is five laboratory instruments combined into one
compact instrument. It is a professional oscilloscope, relative signal
strength indicator, calibrated FM deviation meter, calibrated balance
meter, and phase indicator. These instruments are used by FM stations
to determine the best possible performance for your listening enjoyment.
The Mclntosh Ml 3 Maximum Performance Indicator makes it easy for
you to attain professional broadcasting quality FM listening.
The Mclntosh Ml 3 shows you what you need to do to improve your
system's overall performance. It is designed to be used with an FM
tuner and stereo preamplifier.
When the Ml 3 is used with an FM tuner it will detect and display
multipath reception. Multipath reception is the result of a reflected
signal arriving at the tuner antenna slightly later than the direct signal.
By rotating or repositioning your FM antenna it is possible to reduce
the multipath reception. The Ml 3 Maximum Performance Indicator
makes it easy to know when the FM antenna is oriented for the best
reception of any station.
To show multipath reception the Ml 3 displays instantaneous signal
strength versus frequency deviation. Signal strength is shown as vertical
deflection of the indicator display beam. Frequency deviation is shown
as horizontal deflection. Multipath reception appears as a peak or
valley in the Ml 3 picture tube display.
Multipath reception degrades FM tuner performance in several ways:
1. Usually there is an increase in background noise level.
2. Distortion is often heard in the program signal.
3. Stereo separation may be reduced.
4. The stereo effect may be completely lost.
5. Stereo indicators may fail to function, or function erratically.
To overcome multipath reception it is usually necessary to turn the
antenna to receive the FM signal by one predominant path. Rotating a
directional antenna is effective at correcting multipath reception. In a
metropolitan area where
a
simple antenna
such
as a
dipole
is
used
repositioning
the
antenna
will
achieve
the
same
result.
The Ml 3 is a very effective tuning indicator:
1. Signal strength is shown by the vertical position of the display
trace. The higher the position of the trace the greater the signal
strength.
MAXIMUM
PERFORMANCE
INDICATOR
MI3
1
