Narrow band frequencies for inter-agency coordination and safety and security communications in international humanitarian assistance, as adopted by the fifth WGET Plenary Meeting, Geneva, 20/21 May 1997, and revised by the eight WGET Plenary Meeting, Washington DC, 7 and 8 June 1999)

Within the spectrum allocated to land-mobile service in the VHF range:

Primary Channel (A):

Simplex:            163.100 MHz

Duplex:             Repeater transmits on 163.100 MHz

                        Repeater receives on 158.100

Alternative Channel (B):

Simplex:             163.025 MHz

Duplex:             Repeater transmits on 163.025 MHz

                        Repeater receives on 158.025 MHz

Alternative Channel (C):

Simplex:             163.175 MHz

Duplex:            Repeater transmits on 163.175 MHz

                        Repeater receives on 158.175 MHz

Within the spectrum allocated to land-mobile service in the UHF range:

Primary Channel (UA):

Simplex:            463.100 MHz

Duplex:             Repeater transmits on 463.100 MHz

                        Repeater receives on 458.100

Alternative Channel (UB):

Simplex:             463.025 MHz

Duplex:             Repeater transmits on 463.025 MHz

                        Repeater receives on 458.025 MHz

Alternative Channel (UC):

Simplex:             463.175 MHz

Duplex:            Repeater transmits on 463.175 MHz

                        Repeater receives on 458.175 MHz

Notes:

1. No CTCSS tone should be programmed on the receivers; for the transmitters a CTCSS tone is optional and might be useful if an already existing repeater on the above channels can be used. The most common CTCSS frequency appears to be 141.3 and this can be programmed on the transmitters (only) if the equipment has CTCSS capability.

2. Different from the regulations applicable to the maritime and aeronautical mobile services, there is no international allocation of channels within the land mobile services bands. The above frequencies are therefore not allocated or protected under international or national regulations; their registration in a footnote in the ITU Radio Regulations will however be sought in the next appropriate conference. The channels may be occupied by other services, including local/national services involved in a disaster relief operation. It is the responsibility of the Telecommunications Coordination Officer (TCO) to select one of the alternative channels, in case the primary channel is already in use.

3. The channels are named by letters in order to avoid confusion with the various channel-numbering systems used by the institutions concerned. The channel number corresponding to the Safety and Security Channels A, B and C should be clearly marked on each transceiver.

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