External Antenna Interface
For sites using an Encompass 4 Reader with external antenna, the design must include an interface cable
between the Encompass 4 Reader and the compatible antenna chosen for the site. The antenna interface is
RF coaxial connector with female Type N plug.
Table 6 is a summary of coaxial cable performance. Figures indicate cable loss per 100 feet.
Table 6 Recommended Cables
Cable Type
a
Overall
Diameter (in.)
Cable Loss per
100ft
RG–223 0.216 12.8 dB
RG–214 0.425 7.5 dB
FHJ1–50A 0.250 5.68 dB
LDF2–50 0.375 3.35 dB
FSJ4–50B 0.500 3.4 dB
LDF4–50A 0.500 2.1 dB
LMR–300 0.300 6.1 dB
LMR–400 0.405 4 dB
LMR–600 0.590 2.5 dB
a Suxes 50, 50A, and 50B indicate 50-ohm cables available from
CommScope, formerly the Andrew Corporation.
Chapter 2 Developing the Site Plan
TransCore Proprietary
2–19
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