[Code of Federal Regulations]

[Title 47, Volume 5]

[Revised as of October 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 47CFR87.149]



[Page 201]

 

                       TITLE 47--TELECOMMUNICATION

 

        CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED)

 

PART 87_AVIATION SERVICES--Table of Contents

 

                    Subpart D_Technical Requirements

 

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 [micro]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]