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What is the difference between “assignment Plan”  and “allotment Plan”?

In Assignment Plan a frequency is authorized for use by specified stations. Stations using the same frequency are separated by distances large enough to provide interference-free operation. Distributing frequency to stations is called “assignment” resulting in term “assignment Plan”.
In Allotment Plan a frequency is authorized for use in specified geographical areas or countries. These areas are separated by the distances allowing re-use of the same frequency. Later, administrations responsible for such areas assign frequencies to any station located in these areas. Distributing frequency to areas is called “allotment” resulting in term “allotment Plan”.

"Which worldwide plans have been established under the auspices of the ITU for terrestrial services?

The following worldwide plans have been established, under the auspices of the ITU, for the terrestrial services, and they form part of the Radio Regulations:
 • The frequency allotment plan for coast radiotelephone stations operating in the exclusive maritime mobile bands between 4000 and 27500 kHz (Appendix 25 to RR);
• The frequency allotment plan for the aeronautical mobile (OR) service operating in the exclusive bands between 3025 and 18030 kHz (Appendix 26 to RR);
• The frequency allotment plan for the aeronautical mobile (R) service operating in the exclusive bands between 2850 and 22000 kHz (Appendix 27 to RR).

What frequency bands and services are regulated by the Appendix 25 Plan?

Appendix 25 contains worldwide allotment plan for maritime mobile service (coast radiotelephone stations) in its exclusive bands between 4 and 27.5 MHz.

How can my administration obtain a new frequency allotment in the Appendix 25 Plan ?

You have to submit via WISFAT a T15 notice with the information listed in FXM-Guide at http://www.itu.int/en/ITU-R/terrestrial/tpr/Documents/fxm-guide.pdf. The Bureau will publish this information in a special section of BRIFIC together with the list of administrations to coordinate with. Then you will have to obtain agreements of these administrations by following the procedure of Section I of Appendix 25.

What frequency bands and services are regulated by the Appendix 26 Plan?

Appendix 26 contains worldwide allotment plan for the aeronautical mobile (OR) service in its exclusive bands between 3 025 kHz and 18 030 kHz.

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