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When a disaster strikes, how do you manage to keep communication lines open when all the phone lines are overburdened? Anyone who deals with providing emergency response for a disaster will truly understand the importance of two-way radio communication(walkie talkies).During emergency situations, a walkie talkie provides instant communication and allows people to ask for immediate help. Two way radios are incredibly useful in times of emergency.
Well, Walkie Talkies generally range for 4km, 6km, 8km, 10km, 12km.
People who want to talk to each other have to tune in to the same frequency band, which is called a channel.
Their radios are all “receiving,” so their microphone/loudspeaker units are working as loudspeakers and probably hissing with static, a bit like a conventional radio that’s not tuned into any particular station.
When someone wants to to talk to the others, they hold the push-to-talk button on their handset.
Their radio goes quiet as their loudspeaker switches over to a microphone.
As they talk into it, their words are converted into radio waves and beamed out on the prearranged channel (typically at a frequency around 460 MHz). Since radio waves are part of the electromagnetic spectrum, they travel at the speed of light (300,000 km/second or 186,000 miles/second), so the waves are picked up almost instantaneously by the other handsets.
The radio waves are converted back into fluctuating electric currents and the loudspeakers use those to reproduce the sound of the talker’s voice.
When the talker has finished, he or she says “over” (meaning my bit of talking is finished) and releases the push-to-talk button.
The radio now switches back into listening mode and someone else can talk.
Unlike a normal radio, which will only pick up broadcast voices or music from a radio station, a Walkie-talkie is a two-way radio: you can both talk and listen (send and receive).
The main drawback is that the same frequency channel is used for both things, so only one person can talk at a time.
Walkie-talkies are robust, easy-to-use, Simple.
They’re very handy in situations where lots of people need to listen and only one needs to talk at once
They’re extremely convenient, weighing just 100–200g (3.5–7 oz); work over a decent range (typically 5–10 square km or 2–4 square miles); and have long battery life (20 hours on 3–4 rechargeable or alkaline batteries is typical).
Most inexpensive walkie-talkies are analog units, so they’re subject to interference and relatively easy to eavesdrop
Walkie-talkies are not designed for communication over longer ranges (for which you’ll need something like CB radio or a cellphone).
For over 50 years, Midland has taken a pioneering role in two-way radio technology, introducing CB radio and 14-channel FRS radio technology to the market. Today, Midland is the leading supplier of two-way radios, weather alert radios and an innovator in emergency radio technology. Headquartered in Kansas City, the heart of the country, the Midland brand represents quality, value and reliability. With products sold in leading consumer electronics, sporting goods, specialty outdoor and many other retailers nationwide, Midland Radio Corporation is the U.S. affiliate of an international group of companies spanning North America, Europe and Asia.