Mass Communication and Journalism 2017 Solved Paper

Short wave frequencies are used for long distance radio communication. Shortwave (HF radio ) is used by transoceanic aircraft for communications with air-traffic control centers out of VHF radio range. Most countries with HF citizens’-band allocations use 40 or 80 channels between approximately 26.5 M Hz and 27.9 MHz, in 10 kHz steps.