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2. Hybrid transformer - Wikipedia

   en.wikipedia.org/wiki/Hybrid_transformer

   [1] [2] Today, the transformer version of the hybrid has been replaced by resistor networks and compact IC versions, which use integrated circuit electronics to do the job of the hybrid coil. Radio-frequency hybrids are used to split radio signals, including television. The splitter divides the antenna signal to feed multiple receivers.

3. Two-wire circuit - Wikipedia

   en.wikipedia.org/wiki/Two-wire_circuit

   Two-wire circuits in new installations are limited to intercom and military field telephone applications, though these too are being supplanted by modern digital communication modes. To communicate in both directions in the same wire pair, conversion between four-wire and two-wire was necessary, both at the telephone and at the central office.

4. Land mobile radio system - Wikipedia

   en.wikipedia.org/wiki/Land_mobile_radio_system

   A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld transceivers e.g. "walkie-talkies").

5. Transverter - Wikipedia

   en.wikipedia.org/wiki/Transverter

   A transverter for ATV operation on 5.7 GHz. In radio engineering, a transverter is a radio frequency device that consists of an upconverter and a downconverter in one unit. . Transverters are used in conjunction with transceivers to change the range of frequencies over which the transceiver can commu

6. Trunked radio system - Wikipedia

   en.wikipedia.org/wiki/Trunked_radio_system

   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 ...

7. Antenna tuner - Wikipedia

   en.wikipedia.org/wiki/Antenna_tuner

   An antenna tuner, a matchbox, transmatch, antenna tuning unit (ATU), antenna coupler, or feedline coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by matching the impedance of the radio to the antenna's feedline. Antenna tuners are particularly important for use with ...