TransCore MPRX, System Manual

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MPRX
TransCore Proprietary 2–13
The MPRX’s tag lock output circuit is a single-pole, double-throw relay providing a dry
contact closure. These contacts are rated at 42.2V AC peak (30V
rms
) or 60V DC, at 1A
maximum with non-inductive load.
Output circuit is not intended for the direct control of electromechanical devices such as
motorized barrier arms. For such applications, the MPRX output circuit should be used to
drive a secondary, appropriately rated high-power relay.
Antenna Interface
The site design must include interface cable(s) between the MPRX and the compatible
antenna(s) chosen for the site. The antenna interface is RF coaxial cable with male Type
N sockets on each end.
Table 2 – 5 is a summary of coaxial cable performance. Figures indicate maximum
lengths of cable in feet.
Note: 1.1dB of cable loss is required for proper FCC operation.
Table 2 – 5 Reader to Antenna Cable Performance
Cable Type
a
Overall
Diameter
(in.)
Cable Length (ft.)
915 MHz
Cable Length (ft.)
870MHz
Minimum
Length
b
Maximum
Length
c
Minimum
Length
b
Maximum
Length
c
RG–223 0.216 7.9 21.6 8.2 22.5
RG–214 0.425 14.4 39.3 14.9 41.1
FSJ1–50 0.25 19.4 52.8 19.9 54.6
LDF2–50 0.375 32.8 89.4 33.7 92.7
FSJ4–50B 0.5 32.1 87.6 33.1 90.6
LDF4–50A 0.5 52 141.9 53.4 146.7
LDF5–50A 0.875 92.2 251.4 94.8 260.4
LDF6–50 1.125 135.6 369.6 139.5 383.1
LDF7–50A 1.625 156.4 426.3 161.1 442.2
a. Suffixes 50, 50A, and 50B indicate 50-ohm cables available from the Andrew Corporation.
b. These cable lengths ensure optimal system performance (1.1 dB loss).
c. These cable lengths ensure adequate, but not optimal, system performance (3 dB loss).