comdtinst m2400.1f - US Coast Guard Response Boat-Medium
comdtinst m2400.1f - US Coast Guard Response Boat-Medium
comdtinst m2400.1f - US Coast Guard Response Boat-Medium
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
1.I. Frequency Band Designators. The Institute of Electrical and<br />
Electronic Engineers (IEEE) letter designators are often used, as a<br />
matter of convenience, to define certain bands of frequencies. These<br />
letter designators are repeated below for reference purposes.<br />
DesignatorBand (MHz)DesignatorBand (MHz)<br />
"A" 160-186"C"4200-7000<br />
"G" 186-225"X"7000-11000<br />
"P" 225-390"K"11000-33000<br />
"L" 390-1550"Q"33000-46000<br />
"S" 1550-4200"V"46000-56000<br />
J. Radio Frequency Emission Designators.<br />
1. Type of Signal. Radio frequency emissions are designated by<br />
the necessary bandwidth and classification symbols that<br />
describe the type of signal transmitted.<br />
2. Bandwidth. Necessary bandwidth is calculated using formulas<br />
recommended by the CCIR for a frequency band just sufficient<br />
to transmit information at the rate and with the quality<br />
required under specified conditions.<br />
3. Classification Symbols. Emission classification symbols are<br />
determined by the basic characteristics of an emission as<br />
follows:<br />
(a) First Symbol - Indicates the type of modulation of<br />
the main carrier.<br />
(b) Second Symbol - Indicates the nature of signals(s)<br />
modulating the main carrier.<br />
(c) Third Symbol - Indicates the type of information to<br />
be transmitted.<br />
(d) Fourth Symbol - Indicates the details of the signal<br />
(Optional, recommend use when applicable).<br />
(e) Fifth Symbol - Indicates the nature of multiplexing<br />
(Optional, recommend use when applicable).<br />
1-4
Change language