Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Kupfuura: Kupindira kwakanyanya kumucheto kwakareba kwe150 <unk> 200 metres band <unk> iyo yepamutemo wavelengths yakapihwa kune vanofarira neChipiri National Radio Musangano muna 1923 <unk> yakamanikidza vanofarira kuchinjira kune mapfupi uye mapfupi wavelengths; zvisinei, vanofarira vaive vakaganhurirwa nemutemo kune wavelengths akareba kupfuura 150 metres (2 MHz). Vashoma vane rombo rakanaka avo vakawana mvumo chaiyo yekutaurirana kwekuedza pamawavelengths mapfupi kupfuura 150 metres vakapedza mazana emamita marefu maviri ekutaurirana pamamita 100 (3 MHz) muna 1923 kusanganisira yekutanga transatlantic nzira mbiri dzekutaurirana. Pakazosvika 1924 vamwe vakawanda vane marezinesi chaiwo vaive vachiita nguva dzose kutaurirana kwepasi pemakungwa pamakiromita 6,000 (9,600 km) uye kupfuura. Musi wa 21 September 1924 vazvipiri vanoverengeka muCalifornia vakapedza kurukurirano dzamarudzi maviri nomumwe muzvipiri muNew Zealand. Musi waOctober 19, vatambi veamateur muNew Zealand neEngland vakapedza maminitsi 90 vachikurukurirana vari mumativi maviri enyika yose. Musi wa10 October Musangano weChitatu weNational Radio Conference wakaita kuti mapoka matatu emasaisai mapfupi ave kuwanika kuvateveri vokuUnited States pamamita 80 (3.75 MHz), mamita 40 (7 MHz) uye mamita 20 (14 MHz). Aya akagoverwa munyika yose, nepo bhendi remamita gumi (28 MHz) rakagadzirwa neWashington International Radiotelegraph Conference musi wa25 Mbudzi 1927. Bhendi remamita gumi nemashanu (21 MHz) rakavhurwa kune vanofarira muUnited States musi wa1 Chivabvu 1952.  Mubvunzo: Mabhendi emasaisai mapfupi mangani akagadzirwa?
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