Repeater in the context of Transmitter

A broadcast relay station, also known as a satellite station, relay transmitter, broadcast translator (U.S.), re-broadcaster (Canada), repeater (two-way radio) or complementary station (Mexico), is a broadcast transmitter which repeats (or transponds) the signal of a radio or television station to an area not covered by the originating station.

These expand the broadcast range of a television or radio station beyond the primary signal's original coverage or improves service in the original coverage area. The stations may be (but are not usually) used to create a single-frequency network. They may also be used by an AM or FM radio station to establish a presence on the other band.

A pulsar clock is an extremely accurate clock which functions by measuring radio pulses emitted by pulsars. Currently, only one such clock exists and is located in a church in Gdańsk, with a repeater in the building of the European Parliament in Brussels.

A relay is an electrically operated switch. It has a set of input terminals for one or more control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.

Relays are used to control a circuit by an independent low-power signal and to control several circuits by one signal. They were first used in long-distance telegraph circuits as signal repeaters that transmit a refreshed copy of the incoming signal onto another circuit. Relays were used extensively in telephone exchanges and early computers to perform logical operations.

In telecommunications, a transmission system is a communication system that transmits a signal from one place to another. The signal can be an electrical, optical or radio signal. The goal of a transmission system is to transmit data accurately and efficiently from point A to point B over a distance, using a variety of technologies such as copper cable and fiber-optic cables, satellite links, and wireless communication technologies.

The International Telecommunication Union (ITU) and the European Telecommunications Standards Institute (ETSI) define a transmission system as the interface and medium through which peer physical layer entities transfer bits. It encompasses all the components and technologies involved in transmitting digital data from one location to another, including modems, cables, and other networking equipment.Some transmission systems contain multipliers, which amplify a signal prior to re-transmission, or regenerators, which attempt to reconstruct and re-shape the coded message before re-transmission.

Project 25 (P25 or APCO-25) is a suite of standards for interoperable Land Mobile Radio (LMR) systems designed primarily for public safety users. The standards allow analog conventional, digital conventional, digital trunked, or mixed-mode systems. P25 was originally developed for public safety users in the United States but has also gained acceptance for security, public service, and some commercial applications worldwide. P25 radios are a replacement for analog UHF (typically FM) radios, adding the ability to transfer data as well as voice for more natural implementations of encryption and text messaging. P25 radios are commonly implemented by dispatch organizations, such as police, fire, ambulance and emergency rescue service, using vehicle-mounted radios combined with repeaters and handheld walkie-talkie use.

Starting around 2012, products became available with the newer Phase II modulation protocol. The older protocol known as P25 became P25 Phase I. P25 Phase II (or P25II) products use the more advanced AMBE2+ vocoder, which allows audio to pass through a more compressed bitstream and provides two TDMA voice channels in the same RF bandwidth (12.5 kHz), while Phase I can provide only one voice channel. However, P25 Phase II infrastructure can provide a "dynamic transcoder" feature that translates between Phase I and Phase II as needed. In addition to this, Phase II radios are backwards compatible with Phase I modulation and analog FM modulation, per the standard. (Phase I radios cannot operate on Phase II trunked systems. However, Phase II radios can operate on Phase I systems or conventional systems.) The European Union (EU) has created the Terrestrial Trunked Radio (TETRA) and Digital Mobile Radio (DMR) protocol standards, which fill a similar role to Project 25.

Kgale Hill (Setswana for "The Place that Dried Up") is a hill located in Gaborone, Botswana. Nicknamed "The Sleeping Giant", Kgale Hill reaches a summit elevation of 1,287 metres (4,222 ft) above sea level. The hill used to be home to a television repeater and is now a tourist destination.

Drone warfare is a form of warfare that involves the deployment of military drones or military robots. The robots may be remote controlled by a pilot or have varying levels of autonomy during their mission. Types of robots include unmanned combat aerial vehicles (UCAV) or weaponized commercial unmanned aerial vehicles (UAV), unmanned surface vehicles (USV) or unmanned underwater vehicles (UUV), and unmanned ground vehicles (UGV).The applications of UAVs, UGVs, USVs, and UUVs are diverse, ranging from reconnaissance, kamikaze missions, bomb disposal, cargo transport, and medical evacuation to anti-air, anti-armor, and anti-personnel role. As of 2019, the following nations have been identified as having operational UCAVs: China, France, Greece, India, Iran, Iraq, Israel, Italy, Pakistan, Poland, Russia, South Korea, Turkey, the United States, the United Kingdom and Ukraine.

Drones find application in a variety of military operations, including electronic warfare, explosive ordnance disposal, training and logistics support. However, they are most frequently employed in intelligence, surveillance, target acquisition, and reconnaissance (ISTAR) missions, enabling direct attacks on targets as part of a kill chain or through manned-unmanned teaming. Aerial drone attacks can be executed through the use of purpose-built UCAVs, that deploy ordnance during a drone strike, or by weaponized commercial UAVs that drop munitions or engage aerial assault. Heavy-lift drones may also be used to airlift supplies or evacuation of wounded personnel across a battlefield. Smaller drones, such as SUAVs and MAVs, are man-portable and can be deployed for low-altitude, short-range support operations. Larger drones can serve a "mothership" role by deploying smaller, sub-drones or by being equipped with electronic warfare features such as a signal repeater. Multiple drones can operate and attack simultaneously in a drone swarm and autonomous drones, such as LAWs, utilize military AI.

A regenerator in a telecommunications context is a type of repeater that is used in copper line or optical fibre line transmission systems. The regeneration function involved also appears in other types of systems, e.g. computer networking systems.

A digital signal travelling a significant distance will become weaker and distorted and require periodic help to continue its journey successfully.