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Each radio needs a receiver and a transmitter. When the push-to-talk button is not depressed, the radio receives. An optional squelch circuit can be used to mute static. When the push to talk button is depessed, the receiver is muted and the transmitter is activated. The details of this are left as an excercise to the reader. To make a radio, you may need a crystal diode.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoThis is quite complicated See related links for information.
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Can you use a VHF radio to call a walkie-talkie?
A walkie-talkie refers to a portable radio. VHF range is usually 136 to 172 mhz and a portable will pick up if tuned to this range.
When did the wireless microphone get invented?
A walkie-talkie is a hand-held portable, bi-directional radio transceiver. The first walkie-talkies were developed for military use. Major characteristics include a half-duplex channel (only one radio transmits at a time, though any number can listen) and a push-to-talk switch that starts transmission. The typical physical format looks somewhat like a telephone handset, possibly slightly larger but still a single unit, with an antenna sticking out of the top. Where a phone's earpiece is only loud enough to be heard by the user, a walkie-talkie's built-in speaker can be heard by the user and those in his immediate vicinity. The first radio receiver/transmitter to be nick-named "Walkie-Talkie" was the backpacked Motorola SCR-300, created by an engineering team in 1940 at the Galvin Manufacturing Company (fore-runner of Motorola). The team consisted of Dan Noble, who conceived of the design using FM technology, Henryk Magnuski who was the principal RF engineer, Marion Bond, Lloyd Morris, and Bill Vogel. Motorola also produced the hand-held AM SCR-536 radio during the war, and it was called the "Handie-Talkie" (HT). Donald L. Hings also worked on the early technology behind the walkie-talkie between 1934 and 1941, and is sometimes said to actually have invented it. A Hand-held transceivers became valuable communication tools for police, emergency services, and industrial and commercial users, using frequencies assigned for these services. Walkie-talkies are also popular with some amateur radio operators, operating with an amateur radio license in several different frequency bands. Since even a powerful commercial walkie-talkie is limited to a few watts of power output and a small antenna (the physical size of the package limits both battery capacity and antenna size), hand-held communication range is typically quite short, with a typical range not exceeding the line-of-sight distance to the horizon in open areas, and much less in built-up areas, within buildings, or underground. Many radio services permit the use of a repeater which is located at some high point within the desired coverage area. The repeater listens on one frequency and retransmits on another, so that reliable hand-held to hand-held unit range can be extended to a few score miles (kilometers) or further, using repeaters linked together. Low-power versions, exempt from licence requirements, are also popular children's toys. Prior to the change of CB radio from licensed to un-licensed status, the typical toy walkie-talkie available in retail stores in North America was limited to 100 milliwatts of power on transmit and the 27 MHz citizens' band channels using AM amplitude modulation only. Later toy walkie-talkies operated in the 49 MHz band, some with FM (frequency modulation), shared with cordless phones and baby monitors. The lowest cost devices are very crude electronically, may employ superregenerative receivers, and may lack even a volume control, but they may have elaborate packaging. Unlike more costly units,low-cost toy walkie-talkies may not have separate microphones and speakers; the receiver's speaker typically doubles as a microphone while in transmit mode. The personal walkie-talkie has now become popular again with the new U.S. Family Radio Service and similar unlicensed services in other countries. While FRS walkie-talkies are also sometimes used as toys because mass-production makes them low cost, they have proper superheterodyne receivers and are a useful communication tool for both business and personal use. Operation in the Family Radio Service is restricted to walkie talkies limited to 500 milliwatts of effective RF power. Some FRS models also include the surrounding GMRS channels, which require a license. Trivia Handie Talkie refers to Mototorla portable products only. According to the US Patent and Trademark Office, Handie Talkie became a trademark of Motorola, Inc. on May 22, 1951. The application was filed June 24, 1948 and the trademark registration number is 71560123. The abbreviation HT is commonly used to refer to portable handheld ham radios (from any manufacturer) in the UHF and VHF ranges. A walkie-talkie is called "talkie-walkie" in French.
How do you get barbie walkie talkie working?
Type your answer here... its working for half duplex methode and then can't communicate at the same time for two device or persion .ex: for the Tx persion one information send to the Rx persion , then completly received after Rx send the information to Tx.
What are some inventions made in Canada?
Joseph-Armand Bombardier----- invented the snowmobile. Donald Hings----- invented the Walkie Talkie Wilfred Bigelow----invented the pacemaker John McIntosh-----invented the McIntosh apple Arthur Ganong---- invented the nickel chocolate bar Olivia Poole----- invented the Jolly Jumper Alexander Graham Bell---- invented the Telephone They are all canadians.
What are disadvantages of a smoke signal?
Walkie talkies are not a subsitute for cell phones. They are meant for broadcast mode (talking in a group mode) . Typically used in construction, security, schools and colleges, outdoor catering, airlines, tea and coffee estates, golf courses, resorts, event management and sports. they can go out of range and have a small number of channels that they can communicate to each other on. The biggest limitation of Walkie Talkies, besides being low power (not good for more than 2 - 3 city blocks) is 1) Only one person can talk at a time, and 2) Everyone else with a Walkie Talkie can hear what you are saying to your friend if they are within 2 - 3 city blocks of your house.
How do you make a walkie talkie watch?
tape a walkie talkie to your wrist :)
Does a walkie talkie headset plug into the walkie talkie?
Yes, If you're talking about a cobra the top has a spot. I think all do so the answer is yes a walkie talkie headset DOES indeed plug into a walkie talkie
Is there a setting on a walkie talkie to make the range longer?
no
Do airplanes have emergency walkie talkie?
yes the airplanes have an emergency walkie talkie
When was Talkie Walkie created?
Talkie Walkie was created on 2004-01-21.
When was Walkie Talkie Man created?
Walkie Talkie Man was created in 2004.
What is the most important part about a walkie talkie?
I believe the most important part of the walkie-talkie is the batteries you use and the quality of the walkie-talkie. If you do not have good batteries, you can not use it for very long. If you have a cheap walkie-talkie, you won't get a good signal or range.
Description of a walkie talkie?
a walkie talkie is a hand-held device that u can communicate with,such as your friend.
I dropped your walkie talkie in the toilet since you didnt flush will it still work when its wet?
The walkie talkie may work depending on its properties. If the battery of the walkie talkie is damaged then it is not going to work. I would recommend that you attempt to dry the walkie talkie as quickly as possible. In most cases, the walkie talkie should still work due to the plastic insulation.
Which comes first walkie talkie or beeper?
walkie talkie---1930's beeper-----1990's
What to you get when you cross a chicken with a centipede?
A walkie talkie.A walkie-talkie.
What do you get what you Cross a centipede with a parrot?
A walkie talkie.A walkie-talkie.
