ITC 220 Base Station, Locomotive & Wayside Radio Transceiver Field Service Guide PN 0046300120 Rev. A
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3.5
EQUIPMENT MODIFICATIONS
Caution
– Any changes or modifications to this equipment not expressly approved by the party responsible
for compliance (in the respective country of use) could void the user’s authority to operate the equipment.
4
TRANSMITTER OPERATION
It is the responsibility of the licensee to operate this radio transmitter in compliance with FCC and Industry Canada
service rules for 220-222 MHz, namely FCC Rules Part 90 Subpart T and Industry Canada SRSP-512.
4.1
TRANSCEIVER CHANNELIZATION AND FREQUENCY RANGE
Transceivers can be configured to transmit on any one of 80 selectable 25 kHz spaced channels ranging from 220.0125
to 221.9875 MHz inclusive. The spectrum included corresponds to all 5 kHz-wide FCC channels numbered from 1 at
220.0025 MHz to 400 at 221.9975 MHz. Each Base Station transmission occupies five of the FCC-defined 5 kHz
channels. The lowest radio channel center frequency is in the center of FCC channel 3 and the next is centered on FCC
channel 8, then 13, 18, and so on, up to the highest, which is centered with FCC channel 398.
4.2
BASE CHANNEL RESTRICTIONS
Section 90.715 of the FCC Rules lists the authorized frequencies of the 400 total 5 kHz wide channels. According to
§90.733(d), these can be aggregated into larger channel widths with the exceptions of FCC channels 161-170 and 181-
185. Therefore, the radio may not transmit on those channels or their 221 MHz counterparts, 361-370 and 381-385.
This corresponds to frequencies 220.8125, 220.8375, 220.9125, 221.8125, 221.8375, and 221.9125 MHz.
Please refer to Part 90 Subpart T and SRSP-512 for additional frequency use restrictions in Canadian and Mexican
border areas.
4.3
TRANSCEIVER-RADIATED POWER LIMITS
It is the responsibility of the licensee to comply with the effective radiated power limits based on operating
frequency, geographic location, and effective antenna height specified in 47CFR Subpart T §90.701 et. seq.,
or Industry Canada SRSP-512 §6.3, as applicable.
Important:
The following supplementary antenna system information discusses means for the licensee to determine
effective radiated power (ERP) and to comply with regulatory power limits.
Licensees must comply with specific power vs. antenna height above average terrain (HAAT) limitations for fixed-
antenna stations per §90.729 or SRSP-512 §6.3 unless operating under an explicit waiver of the applicable rule. Note
that U.S. and Canadian power vs. antenna HAAT limitations are not identical and differ in this regard.
Licensees should also note that fixed and mobile installations transmitting between 221 and 222 MHz must limit
effective radiated power (ERP) to 50 W or 10log(50) + 30 = 47 dBm PEP referenced to the 2.15 dBi gain of a dipole. The
EIRP for this case is 49.15 dBm. Also note that the maximum ERP on FCC/IC channels 196-200 at 220.975 to 221.000
MHz is 2 watts.