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Automated Maritime Telecommunications System (AMTS)
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According to the FCC:
"Automated Maritime Telecommunications System (AMTS) stations are a special type of public coast station. The AMTS service was established in 1981 as an alternative to traditional VHF public coast service, primarily to meet the specialized needs of tugs, barges, and other commercial vessels on inland waterways. AMTS stations, which use 217/219 MHz frequencies, were intended primarily to provide public correspondence service to such vessels, but in an integrated manner not readily available from individual VHF public coast stations. AMTS public coast stations also may provide private radio service under certain circumstances, and have limited authority to provide service to units on land. An AMTS licensee may lease all or part of the spectrum usage rights associated with the license."
AMTS stations are located close in frequency to TV channel 13 (210-216 MHz) and channel 10 (192-198 MHz). According to the FCC:
"Section 80.475(a) of the Commission’s Rules requires an applicant proposing to locate an AMTS station within 169 kilometers (105 miles) of a Channel 13 television station, or within 129 kilometers (80 miles) of a Channel 10 television station, to submit "an engineering study clearly showing the means of avoiding interference with television reception within the Grade B contour.” If there are at least one hundred residences within both the proposed AMTS station’s predicted interference contour and the television station’s Grade B contour, the AMTS applicant must also (1) show that its proposed site is the only suitable location, (2) develop a plan to control any interference its operations cause within the Grade B contour, and (3) agree to make any necessary adjustments to affected television receivers to eliminate such interference. Any AMTS licensee that, despite these precautions, causes interference to television reception within the Grade B contour must cure the problem within 90 days of the time it is notified in writing by the Commission or discontinue operation of the station."
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Paired Frequency Bands |
| Paired Bands | Use | Service | Table |
| 217 - 217.5 MHz | AMTS B Block Coast Transmit | Mobile | N |
| 219 - 219.5 MHz | AMTS B Block Ship Transmit | Mobile | N |
| 217.5 - 218 MHz | AMTS A Block Coast Transmit | Mobile | N |
| 219.5 - 220 MHz | AMTS A Block Ship Transmit | Mobile | N |
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