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:
(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;
(d)
Transmissions within 6 kHz of the following protected frequencies and frequency bands must not exceed 10 µW peak ERP:
| 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 |
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:
(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]