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While both use high frequencies that are line of sight range only, the cellphone connects to a cellular network of transceiver antenna towers that are interconnected (via either landlines or microwave links) permitting cellphones at practically unlimited distances to communicate. VHF radios can only communicate when they can "see" each other (or both can "see" the same VHF repeater).
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Is the spectrum of an element limited to the visible region of the electromagnetic spectrum?
No. The emission and absorption spectrum covers everything from UHF radio to X-rays. (There are no energy level transitions that correspond to the low energy HF or VHF radio bands and below. The lowest-energy transition is the one at 1420 MHz/21 cm.)
What is space wave propagation Give two examples of communication system which use space wave mode?
In which radio waves travels in earth's troposphere from transmitting to receiving end is space way propogation Eg: television channels, VHF,UHF
What are 3 forms of Electromagnetic Radiation with a wavelength greater than visible light?
Infrared is one, radio waves are another and many include microwaves as a third but microwaves are used for communications and are a form of radio wave. Wavelengths between radio waves and infrared are called TeraHertz radiation. Radio waves start at very long wavelengths LF or low frequency defined as 30kHz to 300kHz, MF or medium frequency from 300kHz to 3MHz, HF or high frequency from 3MHz to 30MHz, VHF or very high frequency from 30MHz to 300MHz, UHF or ultra high frequency from 300MHz to 3GHz and SHF from 3GHz to 30GHz. After that they are normally just called microwaves. Many microwave ovens operate near 2.4GHz which is only UHF.
What type of electromagnetic wave has a wavelength roughly equal to the height of a person?
Interesting question. Let's say 2 meters for convenience. That's about 6ft 6in. Frequency = (speed)/(wavelength) = 300,000,000/2 = 150 MHz. That's 'VHF' radio waves, with many applications. Right around that frequency is a small piece of spectrum for "ham" operators, some satellite navigation, and some land-mobile "2-way" radio used by taxis, businesses, courier and delivery operations etc. If you go up a bit higher in frequency from there, you arrive at the portion of the radio spectrum which, under the old, traditional scheme of analog television, used to carry TV channels 7 through 13, in the frequency band of 174 to 216 MHz. That range of wavelengths is from 4ft 7.4in to 5ft 7.9in. (1.41 to 1.72 meters) And if you drop down a ways in frequency, to wavelengths of 9.8ft (3 meters), you arrive at 100 MHz. That's the "100" just above the middle of the dial on your FM radio. An easy way to get a feeling for some wavelengths: The horizontal elements or 'sticks' on an outdoor TV antenna are roughly 1/2 the size of the wavelengths they're designed to receive.
What did heinrich hertz do with the electromagnetic spectrum?
He clarified and expanded the electromagnetic theory of light by building an apparatus that detected previously speculated UHF and VHF waves.
What is the history of VHF radio?
history of vhf radio
How do you receive vhf?
You need a VHF radio antenna, a VHF radio receiver and of course a station broadcasting on the VHF frequency.
Harris vhf radio can communicate with prc77 radio?
The PRC77 radio operates on 30.000 to 75.95 MHz. If the Harris radio operates on any of the same frequencies (I know you said it's VHF, but VHF covers 30 to 300 MHz), then it can.
What is the maximum range for a VHF radio?
VHF is in the range 30 to 300 MHz.
Why is the Height of VHF radio important?
Because VHF signals have a line of sight limitation.
Why is height of the VHF radio antenna important?
VHF radios work by the line of sight principle
Abbreviation for VHF radio?
Very High Frequency.
EQ-20 why is the height of a VHF radio antenna important?
VHF radios work by the line of sight principle
Which of the following equipment is recommended while operating a motorboat in Virginia?
Personal Floatation Device for each person aboard
In the United states what is the vhf radio safety and distress calling channel?
VHF channel 16
What is the vhf radio and distress calling channel?
Channel 16
What is the VHF radio safety and distress call?
Channel 16
