| 21. | In 1982, the HF radio interception and Direction finding station at Tangimoana was opened.
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| 22. | As frequency surveillance and direction finding became more sophisticated, these devices enjoyed some success.
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| 23. | A direction finding receiver was also manned, both for surveillance and search and rescue.
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| 24. | Army Airborne Radio Direction Finding ( ARDF ) in South Vietnam was phased out.
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| 25. | The control room is fully equipped with charts, radio, direction finding equipment and radar.
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| 26. | Walther Schwieger, through wireless intercepts and radio direction finding.
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| 27. | Messages were intercepted here and bearings on enemy transmissions were provided using direction finding techniques.
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| 28. | Other flights may use an analog beacon and are tracked using radio direction finding techniques.
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| 29. | Signals could also be recorded for later direction finding.
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| 30. | These antennas are also used for radio direction finding.
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