| 1. | This includes HF contesting, Amateur Radio Direction Finding, and High Speed Telegraphy.
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| 2. | This was to confuse enemy aircraft who might be navigating using radio direction finding.
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| 3. | BFRA was the host organization for the 2006 Amateur Radio Direction Finding World Championships.
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| 4. | Army Airborne Radio Direction Finding ( ARDF ) in South Vietnam was phased out.
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| 5. | The bearing of the signal could be determined using Watt's radio direction finding techniques.
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| 6. | Radio direction finding equipment was installed on several Coast Guard vessels in late 1930.
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| 7. | These antennas are also used for radio direction finding.
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| 8. | The secretary of the Tizard Committee, Radio Direction Finding.
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| 9. | Walther Schwieger, through wireless intercepts and radio direction finding.
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| 10. | Other flights may use an analog beacon and are tracked using radio direction finding techniques.
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