Radiotaajuuskirja/280 kHz

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280 kHz on pitkien aaltojen alueelle kuuluva taajuus, joka osoitettiin Prahan taajuusjakosuunnitelmassa 13. huhtikuuta 1929 Norjalle. <ref>Department of commerce, radio division Radio service bulletin, Washington, May 31, 1929—No. 146, page 25</ref> <references/>

Radiotaajuuskirja/280 kHz