User's Manual

ITCR Locomotive Radio User Guide
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4/30/2013 Do Not Distribute 7
47 dBm PEP and the minimum feasible feedline loss is 0.3 dB, then the radiated
power is 46.7 dBm = 46.8 W ERP.
Most if not all Locomotive installations will include an in-line 220 MHz band pass
filter that adds 0.7 dB loss for a total loss of 1.0 dB. This filter prevents generation of
intermodulation products in the Locomotive radio power amplifier by other cab top
RF power sources, e.g., the 160 MHz voice radio transmitting antenna. The actual
ERP in this case is therefore 47-1.0 = 46 dBm = 39.8 watts. The transmitter
installation cannot be operated on FCC channels numbered 196-200 due to the 2W
limitation.
Other power limits apply to U.S. operation in the frequency ranges 217.6125 MHz to
217.9875 MHz and 219.0125 MHz to 219.9875 MHz. In any case, transmitter power
and antenna heights must comply with the applicable FCC rules, the station license,
and any applicable waivers.
4. Setup and Configuration for the Locomotive Radio
Set up physical connections with the following:
• DC power
• Ethernet
• RF output termination
The sections below identify each of the physical connections.
4.1 Power Supply
Locomotive radios operate at 74V. Table 1 describes the power supply requirements
for the Locomotive radio.
Caution: Applying an incorrect voltage to a Locomotive radio can cause
damage. Confirm the voltage rating of the radio and its power supply
before applying power.
Caution: The power supply voltage of this radio presents a potential
electrical shock hazard. Disconnect all power supply sources before