Moseley PCL6000
2-7
Moseley PCL 6000 Document No. 602-13375-01 Rev.B
2.6
Transmission Cables
The transmission cable between antenna and transmitter or receiver should be coaxial cable
whose loss characteristics are known. Typical quality low-loss foam dielectric lines such as
Andrew LDF4-50, a 0.5 inch diameter cable, has a 2.4 dB loss per 100 feet at 950 MHz. This
cable will generally be adequate where the total cable run (at both transmitter and receiver) is
less than 300 feet and there is a good transmission path of less than 10 miles.
When the total transmission cable length exceeds 300 feet, an obstructed or grazing path occurs,
or the path length exceeds 10 miles, a lower loss cable such as Andrew LDF5-50, a 7/8 inch
diameter cable with a loss of 1.4 dB per 100 feet, is recommended.
To reduce system losses, it is important to select type N connectors that are designed for the type
of transmission cable used in the system. The connectors must be installed in accordance with
the manufacturer's recommendations. It may take only one improperly installed connector to
reduce the received signal strength sufficiently to provide only marginal system performance.
Reasonable care should be exercised during the installation of the transmission cable. Never put
a sharper bend radius in the cable than recommended by the manufacturer. Too sharp a bend
can cause internal cable damage that is not observable on the outside of the cable. This damage
can result in excessive loss in the cable. Since the higher quality transmission cables are
relatively inflexible, Moseley Associates has several short “pigtail” assemblies available. These
pigtails are designed to attach to the ends of the transmission cable and allow movement of the
equipment or antenna with less chance of damaging the transmission cable or the connectors on
the equipment. These pigtails and appropriate connectors are available in installation kits for the
more popular types of transmission cable.
Should it be desired to mount the antenna on a series-fed standard broadcast tower, the required
isolation can be obtained with the installation of a Moseley Associates Isocoupler at the base of
the series-fed antenna. Isolation at standard broadcast frequencies is high, and the isocoupler
introduces only approximately 1.5 dB loss at the STL frequency.
Figure 2-3 shows details of a typical PCL6000 site installation.
Summary of Contents for PCL-600
Page 1: ...User Manual Moseley PCL 6000 Doc 602 13375 01 January 2008...
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Page 30: ...1 18 System Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
Page 32: ...1 20 System Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
Page 64: ...3 10 Operation Moseley PCL 6000 Document No 602 13375 01 Rev B...
Page 86: ...4 22 Module Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
Page 133: ...Moseley PCL6000 5 47 Moseley PCL 6000 Document No 602 13375 01 Rev B...
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Page 138: ...6 4 Customer Service Moseley PCL 6000 Document No 602 13375 01 Rev B...
