![]() ![]() Administrations may apply 12.5 kHz channel interleaving on a non-interference basis to 25 kHz channels, in accordance with the most recent version of Recommendation ITU-R M.1084, provided: The frequencies in this table may also be used for radiocommunications on inland waterways in accordance with the conditions specified in No. The channels of the present Appendix, with exception of channels 06, 13, 15, 16, 17, 70, 75 and 76, may be used for direct-printing telegraphy and data transmission, subject to special arrangement between interested and affected administrationsĭ. The channels of the present Appendix, with the exception of channels 06, 13, 15, 16, 17, 70, 75 and 76, may also be used for highspeed data and facsimile transmissions, subject to special arrangement between interested and affected administrations.Ĭ. However, the use of the channels which are shared with public correspondence shall be subject to prior agreement between interested and affected administrations.ī. ![]() Administrations may designate frequencies in the intership, port operations and ship movement services for use by light aircraft and helicopters to communicate with ships or participating coast station in predominantly maritime support operations under the conditions specified in Nos. Table of Transmitting Frequencies in the VHF Maritime MobileĪ. The Table below also describes the harmonized channels where the digital technologies defined in the most recent version of Recommendation ITU-R M.1842 could be deployed. The channel numbering and the conversion of two-frequency channels for single-frequency operation shall be in accordance with Recommendation ITU-R M.1084-5 Annex 4, Tables 1 and 3. The Table below defines the channel numbering for maritime VHF communications based on 25 kHz channel spacing and use of several duplex channels. compared to most other maritime countries. The large number of blue channels and frequencies indicates the shortage of VHF maritime spectrum in the U.S. and are only available from the auction winner. Frequencies and channels shown in green were auctioned in the U.S. Note that a marine radio operating in the international mode on a channel in which the ship station frequency is shown in black and the shore station frequency shown in blue would not be able to communicate with a U.S. ![]() territorial waters, but are allowed on the high seas and in most other countries. Transmission on frequencies or channels shown in blue are not allowed within U.S. ![]() Installation is as described in the Drake Model R-4C Receiver Instruction Manual.The following table is adapted from the International Telecommunications Union Radio Regulations Appendix 18, including changes adopted by the 2015 World Radio Conference. The 2nd IF fitlers are designed to be installed in the accessory crystal filter slots. Installation requires drilling three small holes in the radio chassis - instructions are provided. #2611.1/#2612.1 (also known as GUF-1) are superior replacements for original 4-pole units. International Radio :: Products by radio :: Drake :: R-4C If Javascript is disabled in your browser click here ![]()
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