| 21. | In addition, many UHF bands, many radio amateurs pursue awards based on Maidenhead grid locators.
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| 22. | Among radio amateurs worldwide the award remains very popular.
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| 23. | Radio amateurs use a variety of transmission modes, including Morse code, radioteletype, data, and voice.
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| 24. | Before using the system it is necessary for a radio amateur's call sign to be validated.
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| 25. | A radio amateur might introduce spark wireless telegraphy.
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| 26. | He is also a licensed radio amateur operator.
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| 27. | Like her father Bhumibol Adulyadej Princess Ubolratana Rajakanya holds radio amateur with the call sign HS1D
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| 28. | Experimenter Publishing created a magazine devoted to radio in July 1919, " Radio Amateur News ".
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| 29. | The tower has been home to the VFDB Hamburg section's radio amateur club station " DF0HHT ".
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| 30. | Unlike that required to qualify for a radio amateur licence, no proof of technical competence was needed.
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