| DESIGNATION | FREQUENCY (MHz) |
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|---|---|---|---|---|---|---|---|
| Ref. Data for Radio Engin. | US Navy | RSGB | |||||
| I | 100 - 150 |
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| G | 150 - 225 |
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| P | 225 - 390 | 225 - 390 |
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| L | 390 - 1,550 | 390 - 1,550 | 1,000 - 2,000 |
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| S | 1,550 - 5,200 | 1,550 - 3,900 | 2,000 - 4,000 |
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| C | 3,900 - 6,200 | 3,900 - 6,200 | 4,000 - 8,000 |
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| X | 5,200 - 10,900 | 6,200 - 10,900 | 8,000 - 12,000 |
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| K | 10,900 - 36,000 | 10,900 - 36,000 | 18,000 - 26,500 |
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| Ku | 15,350 - 17,250 | 15,250 - 17,250 | 12,000 - 18,000 | ||||
| Ka | 33,000 - 36,000 | 33,000 - 36,000 | 26,500 - 40,000 |
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| Q | 36,000 - 46,000 | 36,000 - 46,000 | 33,000 - 50,000 |
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| U | 40,000 - 60,000 |
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| V | 46,000 - 56,000 | 46,000 - 56,000 | |||||
| W | 56,000 - 100,000 | 56,000 - 100,000 | |||||
First columns from Reference Data for Radio Engineers, Fifth Edition, Howard W. Sams & Co., Inc., Indianapolis, Indiana: 1970.
The columns headed "US Navy" were copied from US Navy Submarine Communications Spectrum at http://mintaka.spawar.navy.mil/ftp/pmw173/APX-C.pdf.
The columns headed "RSGB" were derived from a chart posted by the Radio Society of Great Britain at http://www.rsgb.org.uk/society/uwinfo/uwfaq6.htm
Scott Hudson posted yet another chart of letter designations with different boundaries than shown above.
Disclaimer: John Neuhaus makes no warranty as to the accuracy or completeness of the information on these pages. All risk relating to its use is assumed by the user.