are used to amplify a single TV channel.
**************************************************************************
Provide broadband distribution amplifiers. Amplifiers shall amplify
broadband signals from 40 to 750 MHz and provide an amplified return path
for signals from 5 to 40 MHz for 75 ohms impedance. Amplifiers shall be
bidirectional with variable slope and gain control.
2.2.2
Attenuators
Provide attenuators to equalize signal levels, when required.
Variable
attenuators are not permitted.
2.2.3
Power supplies shall contain a current limiter circuit to protect against
short circuits on the radio frequency (RF) line. Provide overvoltage
protection to protect solid state equipment from line surges and induced
voltages, in accordance with IEEE C62.41.
2.3
DISTRIBUTION EQUIPMENT
**************************************************************************
NOTE: Delete paragraphs for distribution amplifiers
when design calculations indicate they are not
required.
**************************************************************************
2.3.1
Distribution Amplifiers
Distribution amplifiers shall be equipped for 75 ohms input and output
impedance. Electronic equipment exposed to weather shall be equipped with
weatherproof housings. Amplifiers shall be bidirectional with variable
slope and gain control and shall amplify broadband signals from 50 to 750
MHz and provide an amplified return path for signals from 5 to 40 MHz for
75 ohms impedance.
2.3.1.1
Trunk Amplifiers
Trunk amplifiers shall have automatic level and slope control features.
2.3.1.2
Bridging amplifiers shall be used to connect feeder cables to trunk cables.
2.3.2
Cables and Associated Hardware
**************************************************************************
NOTE: For cable subject to moisture from flooding or
coastal areas or in cities with significant air
pollution, specify the same cable protected by a
black polyethylene jacket with a flooding or other
water migration deterrent compound between the
jacket and the aluminum shield. When this type of
cable is required, add the requirement to the item
specifying the jacket and insulation in the
applicable cable paragraph(s).
SECTION 16783N
Page 11