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This requires either two separate radio channels or channel sharing methods such as time-division duplex (TDD) to carry the two directions of the conversation simultaneously on a single radio frequency. [2] The first two-way radio was an AM-only device introduced by the Galvin Manufacturing Corporation in 1940 for use by the police and military ...
The initial channel allocations had a gap equal to two channel spaces between channels 22 and 23. Those channels were assigned to the Business Radio Service. Beginning in 1977, those two channels (and 15 others above CB Channel 23) were reallocated to CB use. Channel 23 was left as it was so that users of pre-1977 equipment could use that ...
Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.
So channel 1 on an 18 channel was actually channel 5 on a 23 channel radio. These roughly corresponded to the present channels 5–22, except for the two unique frequencies that are known as 11A (Channel 7 on an 18 channel Australian CB) and 19A (Channel 16 on an 18 channel Australian CB) or remote control frequencies but are no longer part of ...
A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a talkgroup) with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time ...
The Original ASTRO 25 format utilizes APCO Project 25 Phase I technology (FDMA). It is the most used format of the ASTRO 25 family of radio systems. The ASTRO 25 Phase II system, which complies with the P25 Phase II standard, uses TDMA technology to deliver two voice channels over a single wireless trunking channel. [4]
To make MURS two-way radios work together, they must have matching CTCSS or DCS tones. This can usually be done via basic programming which almost all MURS two-way radios support. The goTenna, a digital radio product, operates on the MURS band and pairs with smartphones to enable users to send texts and share locations on a peer-to-peer basis ...
A radio repeater is a combination of a radio receiver and a radio transmitter that receives a signal and retransmits it, so that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of each other, to communicate. [ 1 ]
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