| 1. | You can't use the OBS; you use Automatic Direction Finder for NDBs.
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| 2. | But the base's radio direction finder only had a single loop antenna.
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| 3. | Visibility was poor, and weather conditions prevented obtaining radio direction finder bearings.
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| 4. | In 1929 the navy set up a direction finder by the lighthouse.
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| 5. | Radio direction finders have evolved, following the development of new electronics.
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| 6. | For example, Francis Hubbard's sonar direction finder patent filed in 1921.
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| 7. | A Gerkules sonar was also fitted in addition to various radio direction finders.
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| 8. | The lifeboats also support the Simrad TD-L1550 VHF-FM radio direction finder.
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| 9. | Each consisted of an omnidirectional transmitter an omnidirectional receiver and a direction finder.
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| 10. | Using the direction finder ( DF ) the angle was measured.
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