noun. xov tooj uas cov lus lossis cov teeb liab raug xa los ntawm xov tooj cua nthwv dejtsis yog los ntawm xov hlau lossis cables.
xov tooj wireless siv yog dab tsi?
Wireless xov tooj txuas ntxiv tau siv rau kev lag luam ntiag tug ntawm tib neeg-rau-tus neeg ua lag luam, tsoomfwv, thiab kev sib txuas lus tub rog, xws li xov tooj thiab kev sib txuas lus kev sib tham, thiab hloov mus rau hauv xov tooj cua xov tooj cua.
Leej twg invented wireless telegraph?
Leej twg nyob tom qab xov tooj wireless? Irish-Italian wireless pioneer Guglielmo Marconi tau yog thawj zaug pom qhov zoo-thiab kev ua lag luam muaj peev xwm-ntawm equipping ships nrog wireless telegraph khoom. Cov thev naus laus zis tau ua raws li kev tshawb pom los ntawm cov kws kho mob hauv lub sijhawm kawg ntawm lub xyoo pua 19th.
CQD sawv rau dab tsi?
Hauv xyoo 1904, lub tuam txhab Marconi tau qhia txog kev siv "CQD" rau lub teeb liab teeb meem. Txawm hais tias feem ntau lees txais los txhais hais tias, " Tuaj nrawm nrawm,” tsis yog li ntawd. Nws yog kev hu dav dav, "CQ," ua raws li "D," lub ntsiab lus kev nyuaj siab. Kev txhais lus nruj yuav yog "Txhua qhov chaw nres tsheb, Kev Nyuaj Siab."
Marconi thawj cov lus yog dab tsi?
Hnub tim 13 Lub Tsib Hlis 1897, Marconi tau xa thawj qhov kev sib txuas lus wireless hla hiav txwv qhib - cov lus tau raug xa mus hla Bristol Channel los ntawm Flat Holm Island mus rau Lavernock Point ze Cardiff, qhov deb ntawm 6 mais (3.7 mi). Cov lus nyeem, "Koj puas yogready"..
