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5
BAVM-860SAW Instruction Manual
General
The BAVM-860SAW is an all solid state audio/video modulator that provides a modulated visual and aural RF carrier output
on any single CATV channel 2 to 135. The modulator can be used to put sound and color video on any of the above listed
channels in a CATV, MATV or SMATV system.
The modulator accepts standard (sync negative) polarity video at a 0.7-2.5 V P-P level from sources such as a TV camera,
video tape recorder, TV demodulator or satellite receiver.
The BAVM-860SAW features a +55 dBmV RF output level, and IF SAW filtering for adjacent channel operation. All
aeronautical channels are offset positive with a tolerance of ±5 kHz as required by FCC 21006. For ease of operation, all
level controls are located on the front panel.
A block diagram of the BAVM-860SAW is shown below. The audio/video modulator accepts a baseband video and audio
input and outputs an RF CATV channel. The RF level control provides up to +55 dBmV output. The video modulator control
sets the depth of modulation fo 87.5% over an input video level range from 0.7VP/P to 2.5VP/P.An audio modulation control
permits adjustment for ±25 kHz peak deviation of the aural carrier.
BAVM-860SAW Block Diagram
45.75 MHz
OSCILLATOR
A/V
MODULATOR
VIDEO MOD.
CONTROL
VIDEO IN
AUDIO IN
AUDIO MOD.
CONTROL
A/V
MODULATOR
SYNTHESIZED
PLL
OSCILLATOR
BAND PASS
FILTER
BAND PASS
FILTER
PRE-EMPHASIS
AMPLIFIER
AURAL LEVEL
CONTROL
RF LEVEL
CONTROL
RF
OUTPUT
-30 dB TEST POINT
MIXER
The BAVM-860SAW also provides a field-defeatable pre-emphasis network and an aural level control to ensure the proper
aural/visual ratio. An six foot cord and a convenience AC outlet on each amplifier permits easy connections between racked
units.
