DRAKE VM2050 Instruction Manual - Page 4
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Table of Contents / Description
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Important Safety Instructions
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Table of Contents / Description
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VM2050 T CHANNEL MODULATOR
DESCRIPTION
The R.L. Drake VM2050 Video Modulator is a high quality,
vestigial sideband unit with synthesized visual and audio
carriers. The VM2050 is designed to accept video and
audio baseband signals from a camera, VCR, or similar
equipment for the purpose of sending remote source
information back to the headend of a SMATV or cable
distribution system. Front panel video and audio level
controls with accompanying modulation indicators permit
setting the proper modulation levels. The A/V ratio and
RF output level controls are also provided on the front
panel. Composite video/audio IF input and output is also
provided. Synthesized operation provides complete
frequency agility, allowing front panel selection of any
standard T Channel from T7 through T14.
V I D E O
A U D I O
L E V E L
L E V E L
POWER
MODULATION
MODULATION
The modulator accepts standard (sync negative) polarity
video at a 0.7 - 1.5 Vp-p level. A high quality IF SAW filter
eliminates adjacent channel interference.
IF loop-thru capability in the VM2050 supplies a padded
IF output prior to channel conversion. This feature
provides the capability to replace the standard internally
generated IF output with an alternate source of composite
IF, or allows insertion of IF scrambling equipment. All of
the mentioned features, combined with a carefully
designed low intermodulation output stage, permits
adjacent channel operation so that multiple T channel
signals can be combined and sent to the headend of a
SMATV or cable distribution system.
R F O U T P U T
A/V RATIO
LEVEL
T-
1
4
CHANNEL
OUTPUT
ENABLED