Sec. 80.374  Special provisions for frequencies in the 4000-4063 kHz and 
          the 8100-8195 kHz bands shared with the fixed service.

    Until implementation procedures and schedules are determined by a 
conference of the International Telecommunications Union (ITU), the 
bands 4000-4063 kHz and 8100-8195 kHz are allocated on a shared primary 
basis between the fixed service and the maritime mobile service; see 
Sec. 2.106, note US236, of the Commission's Rules. Frequency assignments 
in the 4000-4063 kHz and 8100-8195 kHz bands are subject to coordination 
with government users. Additionally, coast station assignments in the 
4000-4063 kHz band deviate from international provisions. Coast station 
assignments in the 4000-4063 kHz band are permitted provided that 
harmful interference is not caused to, and must accept interference 
from, stations operated by other countries in accordance with the Radio 
Regulations (see Radio Regulation Nos. 342 and 517).

[[Page 100]]

    (a) Application requirements. Applicants for public coast station 
frequencies described in this section must submit a substantial showing 
of need based on the following factors:
    (1) A schedule of each currently licensed 4, 6, and 8 MHz frequency 
and the expected use of the proposed frequencies;
    (2) For additional frequencies within the same MHz band, a factual 
showing of the 3 busiest hours of any 4 days within a consecutive 10 day 
period for each of the 2 months immediately preceding the filing of the 
application indicating that the applicant has used its currently 
assigned frequencies within the same MHz band an aggregate average of at 
least 40% of the 3 busiest hours of each day for exchanging 
communications; and
    (3) Any other facts that support the need for the proposed 
assignment, e.g., evidence of radio interference by another station 
located near enough to render a currently licensed frequency 
substantially unusable.
    (b) Frequencies in the 4000-4063 kHz band. (1) The frequencies in 
the 4000-4063 kHz bands are available to ship and public coast stations 
for:
    (i) Supplementary ship-to-shore duplex operations with coast 
stations assigned the frequencies described in Sec. 80.371(b) of this 
part;
    (ii) Intership simplex operations and cross-band operations;
    (iii) Ship-to-shore or shore-to-ship simplex operations; or
    (iv) Duplex operations with coast stations assigned in the band 
4438-4650 kHz, as described in Sec. 80.373(d) of this part.
    (2) The following table describes the channelization of carrier 
frequencies in the 4000-4063 kHz band.

                        Carrier Frequencies (kHz)                       
------------------------------------------------------------------------
                                                                        
------------------------------------------------------------------------
4000.............         4015               4030              4045     
4003.............         4018               4033              4048     
4006.............         4021               4036              4051     
4009.............         4024               4039              4054     
4012.............         4027               4042              4057     
------------------------------------------------------------------------

    (c) Frequencies in the 8100-8195 kHz band. (1) The frequencies in 
the 8100-8195 kHz bands are available to ship and public coast stations 
for:
    (i) Supplementary ship-to-shore duplex operations with coast 
stations assigned the frequencies described in Sec. 80.371(b) of this 
part;
    (ii) Intership simplex operations and cross-band operations; or
    (iii) Ship-to-shore or shore-to-ship simplex operations.
    (2) The following table describes the channelization of carrier 
frequencies in the 8100-8195 kHz band.

                        Carrier Frequencies (kHz)                       
------------------------------------------------------------------------
                                                                        
------------------------------------------------------------------------
8101...................             8137                    8167        
8104...................             8140                    8170        
8107...................             8143                    8173        
8110...................             8146                    8176        
8116...................             8149                    8179        
8119...................             8152                    8182        
8122...................             8155                    8185        
8125...................             8158                    8188        
8131...................             8161                    8191        
8134...................             8164                                
------------------------------------------------------------------------

[ 56 FR 9896 , Mar. 8, 1991]

                           Radiodetermination