DRAKE VM1550 Gebrauchsanweisung - Seite 4

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Table of Contents / General Description

TABLE OF CONTENTS

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GENERAL DESCRIPTION
The R.L Drake VM1550 Video Modulator is a high quality
vestigial sideband heterodyne audio/video modulator that
provides a modulated visual and aural RF carrier output
on VHF channels, 2-13; Midband, A-I; Superband, J-W;
or Hyperband, AA-HH. Consult factory for custom
channels. All aeronautical channels are offset positive
with a tolerance of ±5 kHz as required by FCC rules. The
VM1550 is designed to accept video and audio baseband
signals from a satellite receiver, TV camera, video tape
recorder, TV modulator or similar equipment. The
heterodyne conversion system, in conjunction with the
use of a SAW filter, insures optimum vestigial selectivity
for adjacent channel headends.
IF loop-thru capability in the VM1550 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.
V I D E O L E V E L
A U D I O L E V E L
OVER
POWER
MODULATION
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Frequency Allocation Chart
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Notes
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Warranty
A / V R A T I O
The modulator accepts standard (sync negative) polarity
video at a 0.7 -2.5 Vpp level. All level controls and
modulation indicators are located on the front panel for
ease of operation.
Field-defeatable audio pre-emphasis enables
transmission of BTSC encoded standard baseband stereo
audio signals.
VM1550 VIDEO MODULATOR
CHANNEL
RF LEVEL