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VLF (???????????) [2] عدل القيمة على Wikidata
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3 ???????? [3] عدل القيمة على Wikidata
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30 ???????? [3] عدل القيمة على Wikidata

?????? ???? ???????? ( ??????????? : Very low frequency )? ???????? VLF? ??? ??????? ?????? ????????? [4] ?? ???? ?????? ??????? ?????? ??? 3 ??? 30 ??? ???? ? ???? ????? ??? ???? ?? 100 ??? 10 ???????? ??? ???????.

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  1. ^ ????? ??: Nomenclature of the frequency and wavelength bands used in telecommunications . ??? ????? ?? ??? ?????: ???? ????? ?? ????? ???????. ??????: ??????? ?????? ?????????.
  2. ^ ????? ??: Radio Regulations, Edition of 2020 . ??? ?? ??? ?? ???? ?? ???: 2.1. ??????: ??????? ?????? ?????????. ??? ????? ?? ??? ?????: ???? ????? ?? ????? ???????. ????? ?????: 2020.
  3. ^ ? ? ????? ??: Nomenclature of the frequency and wavelength bands used in telecommunications (08/2015) . ??????: ??????? ?????? ?????????. ??? ????? ?? ??? ?????: ??????????. ????? ?????: ????? 2015.
  4. ^ "Rec. ITU-R V.431-7, Nomenclature of the frequency and wavelength bands used in telecommunications" (PDF) . ITU. ????? ?? ????? (PDF) ?? 31 ?????? 2013 . ???? ???? ?????? 20 ?????? 2013 .