2.1.3
Analog Repeater
Active circuitry in the equipment shall be solid state. Amplifier
parameters shall be selected for the system requirements. The amplifier
shall incorporate provisions for both forward and reverse changes. The
frequency response for the forward channel, and for the reverse channel
shall be selected to match the MODEMS used. The flatness of the amplifier
(tilt and slope) shall be set to compensate for the installed cable system.
The amplifier gain shall be set to provide levels per system requirements.
The maximum amplifier gain shall not be exceeded. The amplifier shall be
chosen with a dynamic range that meets the system requirements. The
distortion shall be less than minus 50 dB from 50 to 300 MHz at full gain.
The hum modulation shall be less than minus 60 dB.
2.2
VIDEO EQUIPMENT
2.2.1
Video Repeater
Active circuitry in the equipment shall be solid state. Amplifier
parameters shall be selected for the system requirements. The amplifier
shall incorporate provisions for both forward and reverse changes. The
frequency response for the forward channel, and for the reverse channel
shall be selected to match the MODEMS used. The flatness of the amplifier
(tilt and slope) shall be set to compensate for the installed cable system.
The amplifier gain shall be set to provide levels per system requirements.
The maximum amplifier gain shall not be exceeded. The amplifier shall be
chosen with a dynamic range that meets the system requirements. The
distortion shall be less than minus 50 dB from 50 to 300 MHz at full gain.
The hum modulation shall be less than minus 60 dB.
2.2.2
Other Video Equipment
Video equipment not specified herein shall be furnished as specified in
Section 16751A CLOSED CIRCUIT TELEVISION SYSTEMS.
2.3
CABLE
2.3.1
Foam-Filled Rigid Coaxial Cable
Foam-filled cable shall be 10.5, 12.7, or 19.1 mm 0.412, 0.500, or 0.750
inch polyethylene foam insulated cable with solid copper or copper-clad
aluminum center conductor and solid aluminum sheath. The cable shall have
a characteristic impedance of 75 ohms plus or minus 2 ohms over the
passband frequency range and a structural return loss of 26 dB maximum in
the frequency passband. Maximum attenuation at 20 degrees C 68 degrees F
and 270 MHz shall be 1.87 dB/30.5 m 1.87 dB/100 feet for 10.5 mm 0.412 inch
cable, 1.48 dB/30.5 m 1.48 dB/100 feet for 12.7 mm 0.500 inch cable, or
1.10 dB/30.5 m 1.10 dB/100 feet for 19.1 mm 0.750 inch cable. The maximum
dc loop resistance at 20 degrees C 68 degrees F shall be 2.4 ohms/305 m 2.4
ohms/1000 feet for 10.5 mm 0.412 inch cable or 1.5 ohms/305 m 1.5 ohms/1000
feet for 12.7 and 19.1 mm 0.500 and 0.750 inch cable. Cable manufacturer's
recommendations for maximum pulling tension, maximum sidewall pressure, and
minimum bend radius shall not be exceeded. All interior cables' insulation
and jacketing material shall not contain any poly vinyl chloride (PVC)
compounds.
2.3.2
Flexible Coaxial Cable
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SECTION 16794A
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