Sec. 90.266  Long distance communications on frequencies below 25 MHz.

    (a) The use of any particular frequency between 2 and 25 MHz is 
limited to those frequencies falling within the bands allocated to the 
fixed and land mobile services as indicated in Sec. 2.106 of the 
Commission's Rules and Regulations.
    (b) Only in the following circumstances will authority be extended 
to stations to operate on the frequencies below 25 MHz:
    (1) To provide communications circuits to support operations which 
are highly important to the national interest and where other means of 
telecommunication are unavailable;
    (2) To provide standby and/or backup communications circuits to 
regular domestic communications circuits which have been disrupted by 
disasters and/or emergencies.

[[Page 484]]

    (c) No protection is afforded to users of these frequencies from 
harmful interference caused by foreign operations.
    (d) In the event that a complaint of harmful interference resulting 
from operation of these circuits is received from a foreign source, the 
offending circuit(s) must cease operation on the particular frequency 
concerned immediately upon notification by the Commission.
    (e) In order to accommodate the situations described in paragraphs 
(c) and (d) of this section, the equipment shall be capable of 
transmitting and receiving on any frequency within the bands between 2 
and 25 MHz and capable of immediate change among the frequencies, 
provided, however, that this requirement does not apply to equipment 
manufactured prior to August 15, 1983.
    (f) Only 2K80J3E, 100HA1A, 100HA1B and those emission types listed 
in Sec. 90.237(g) are permitted.
    (g) Applicants must fulfill eligibility requirements set out in 
Sec. 90.35(c)(1) and submit communications plans pursuant to 
Sec. 90.129(o).
    (h) Exercises or circuits tests which require use of these 
frequencies for more than seven hours per week cumulative are prohibited 
unless prior written approval is obtained from the Commission.
[ 48 FR 32996 , July 20, 1983, as amended at  49 FR 48712 , Dec. 14, 1984; 
 52 FR 29856 , Aug. 12, 1987;  62 FR 18929 , Apr. 17, 1997]

    Effective Date Note: At  62 FR 18929 , Apr. 17, 1997, Sec. 90.265 was 
amended by revising the section heading, the introductory text of 
paragraph (b), and paragraph (g), effective Oct. 17, 1997.