2.13.5
Master Video Sync Generator
The master video sync generator shall generate horizontal drive, vertical
drive, blanking, and sync signals as a minimum, with at least one 75 ohm
output provided for each signal. The master oscillator crystal shall be
pre-aged, and temperature stabilized, ovenized or temperature compensated.
The sync generator shall have a composite video input and shall lock to the
incoming video signal. If no video is present at the video input, the sync
generator shall switch to internal crystal control. Not less than 2.5
microseconds advance and 2.5 microseconds delay of horizontal phase shall
be provided. Vertical blanking width adjustment shall be provided.
Vertical blanking width adjustment shall have a minimum selection range of
19, 20, and 21 lines.
2.13.6
Video Sync Distribution Amplifier
The sync distribution amplifier shall be a regenerative amplifier designed
to distribute a sync signal input to not less than 6, 75 ohm outputs.
Output level shall remain constant and shall not be affected by input level
variations. Output isolation shall be greater than 35 dB at 5 MHz. A high
impedance loop through shall be provided in addition to the 6 outputs. The
distribution amplifier shall have continuously variable delay range of at
least 250 nanoseconds to 2.2 microseconds. The delay shall be adjustable
through a front panel control.
2.14
CCTV CAMERA POLES
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NOTE: The designer will specify the types of camera
poles to be used at the site. The designer will
eliminate the camera poles not used from the CCTV
specification. Paragraph "Cantilever Camera Pole,"
and paragraph "Straight Camera Pole," give the
designer the choice of hinged or non-hinged poles.
The hinged poles will be specified with
counterweights. If sync is being distributed to the
cameras, specify the wiring harness with sync
distribution. Paragraph "Pan/Tilt Mounting Pole"
gives the designer the choice of length for the
pan/tilt mounting pole and the designer will specify
the height of the pole needed. The designer should
only use paragraph "Pan/Tilt Mounting Pole" for
pan/tilt mounts. Pan/tilt mounting poles must be
very sturdy to comply with the 0.1 of 1 degree
deflection specified, and are therefore expensive
and must be custom fabricated.
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2.14.1
Cantilever Camera Pole
The camera mounting pole shall be a [non-hinged] [hinged] cantilever
aluminum pole with [counterweights] [and] mounting base. All fittings
shall be stainless steel. The camera mounting plate shall locate the
camera 4.6 m (180 inches) 180 inches vertically from the base, and 2.7 m
(105 inches) 105 inches horizontally from the centerline of the pole to the
centerline of the camera. The camera mount shall be adjustable with a
minimum of 40 degrees pan away from the pole and 6 degrees pan toward the
pole, and plus and minus 90 degrees of tilt. The pole shall have an
internal wiring harness that routes [video,] [video, sync,] and power
SECTION 16751A
Page 35
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