2011年ACCA考试模拟练习题（1）

　　ALLOCATION OF FREQUENCIES IN THE RADIO SPECTRUM

　　In the United States the National Telecommunications and Information Administration （NTIA） has responsibility for assigning each portion of the

　　radio spectrum （9 kHz to 300 GHz） for different uses. These assignments must be compatible with the rules of the International Telecommunications

　　Union （ITU）， to which the United States is bound by treaty. The current assignments are given in a wall chart （Reference 1） and may also be found

　　on the NTIA web site （Reference 2）。 The list below summarizes the broad features of the spectrum allocation, with particular attention to those sections

　　of scientific interest. The references should be consulted for details of the allocations in the frequency bands listed here, which in some cases are quite

　　complex.

　　REFERENCES

　　1. United States Frequency Allocations, 1996 Spectrum Wall Chart, Stock No. 003-000-00652-2, U. S. Government Printing Office, P. O. Box

　　371954, Pittsburgh, PA 15250-7954.

　　2. http://www.ntia.doc.gov/osmhome/allochrt.html

　　Frequency range Allocation

　　9 - 19.95 kHz Maritime communication, navigation

　　19.95 - 20.05 kHz Standard frequency and time signal （also at 60 kHz and 2.5, 5, 10, 15, 20, 25 MHz）

　　20.05 - 535 kHz Maritime and aeronautical communication, navigation

　　535 - 1605 kHz AM radio broadcasting

　　1605 - 3500 kHz Mobile communication and navigation, amateur radio （1800-1900 kHz）

　　3.5 - 4.0 MHz Amateur radio

　　4.0 - 5.95 MHz Mobile communication

　　5.95 - 13.36 MHz Mobile communication, amateur, short-wave broadcasting

　　13.36 - 13.41 MHz Radioastronomy

　　13.41 - 25.55 MHz Mobile communication, amateur, short-wave broadcasting

　　25.55 - 25.67 MHz Radioastronomy

　　25.67 - 37.5 MHz Mobile communication, amateur, short-wave broadcasting

　　37.5 -38.25 MHz Radioastronomy

　　38.25 - 50.0 MHz Mobile communication

　　50.0 - 54.0 MHz Amateur

　　54.0 - 72.0 MHz TV channels 2-4

　　72.0 - 73.0 MHz Mobile communication

　　73.0 - 74.6 MHz Radioastronomy

　　74.6 - 76.0 MHz Mobile communication

　　76.0 - 88.0 MHz TV channels 5-6

　　88.0 - 108.0 MHz FM radio broadcasting

　　108.0 - 118.0 MHz Aeronautical navigation

　　118.0 - 174.0 MHz Mobile communication, space research, meteorological satellites

　　174.0 - 216.0 MHz TV channels 7-13

　　216.0 - 400.05 MHz Mobile communication

　　400.05 - 400.15 MHz Standard frequency and time satellite （also 20 and 25 GHz）

　　400.15 - 406.1 MHz Meteorological aids （radiosonde）

　　406.1 - 410.0 MHz Radioastronomy

　　410.0 - 470.0 MHz Mobile communication, amateur

　　470.0 - 512.0 MHz TV channels 14-20

　　512.0 - 608.0 MHz TV channels 21-36

　　608.0 - 614.0 MHz Radioastronomy

　　614.0 - 806.0 MHz TV channels 38-69

　　806 -1400 MHz Mobile communication, navigation

　　1400 - 1427 MHz Radioastronomy, space research

　　1427 - 1660 MHz Various navigation and satellite applications

　　1660 - 1710 MHz Radioastronomy, space research, meteorology

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