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BY ORDER OF THE SECRETARY OF THE AIR FORCE AIR FORCE ...

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AFMAN 11-217 V1 3 JANUARY 2005 99<br />

6.10.2. Frequencies. The SDF transmits signals within the range of 108.10 MHz to<br />

111.95 MHz.<br />

Figure 6.7. SDF Approach.<br />

6.11. Nondirectional Radio Beacon (NDB).<br />

6.11.1. Frequencies. NDB is a low, or medium, or ultra high frequency radio beacon that<br />

transmits nondirectional signals whereby an aircraft properly equipped can automatically<br />

determine and display bearing to any radio station within its frequency and sensitivity<br />

range. These facilities normally operate on frequencies between 190 and 1750 kHz or<br />

275-287 MHz and transmit a continuous carrier keyed to provide identification except<br />

during voice transmission.<br />

6.11.2. Compass Locator. When a radio beacon is used in conjunction with the ILS

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