Sec. 87.149  Special requirements for automatic link establishment 
          (ALE).

    Brief signalling for the purposes of measuring the quality of a 
radio channel and thereafter establishing communication shall be 
permitted within the 2 MHz-30 MHz band. Public coast stations licensed 
under part 80 of this chapter providing high seas service are authorized 
by rule to use such signalling under the following conditions:
    (a) The transmitter power shall not exceed 100 W ERP;
    (b) Transmissions must sweep linearly in frequency at a rate of at 
least 60 kHz per second, occupying any 3 kHz bandwidth for less than 50 
milliseconds;
    (c) The transmitter shall scan the band no more than four times per 
hour;
    (d) Transmissions within 6 kHz of the following protected 
frequencies and frequency bands must not exceed 10 W peak ERP:
    (1) Protected frequencies (kHz)

  2091.0       4188.0         6312.0         12290.0        16420.0     
  2174.5       4207.5         8257.0         12392.0        16522.0     
  2182.0       5000.0         8291.0         12520.0        16695.0     
  2187.5       5167.5         8357.5         12563.0        16750.0     
  2500.0       5680.0         8364.0         12577.0        16804.5     
  3023.0       6215.0         8375.0         15000.0        20000.0     
  4000.0       6268.0         8414.5         16000.0        25000.0     
  4177.5       6282.0         10000.0                                   
                                                                        

    (2) Protected bands (kHz)

4125.0-4128.0
8376.25-8386.75
13360.0-13410.0
25500.0-25670.0

    (e) The instantaneous signal, which refers to the peak power that 
would be measured with the frequency sweep stopped, along with spurious 
emissions generated from the sweeping signal, must be attenuated below 
the peak carrier power (in watts) as follows:
    (1) On any frequency more than 5 Hz from the instantaneous carrier 
frequency, at least 3 dB;
    (2) On any frequency more than 250 Hz from the instantaneous carrier 
frequency, at least 40 dB; and
    (3) On any frequency more than 7.5 kHz from the instantaneous 
carrier frequency, at least 43 + 10log10 (peak power in 
watts) db.
[ 62 FR 40308 , July 28, 1997]

                         Subpart E--Frequencies