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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]
An SSTV repeater is an amateur radio repeater station that relays slow-scan television signals. A typical SSTV repeater is equipped with a HF or VHF transceiver and a computer with a sound card, which serves as a demodulator/modulator of SSTV signals. SSTV repeaters are used by amateur radio operators for exchanging pictures.
Cellular repeater: This is a radio repeater for boosting cell phone reception in a limited area. The device functions like a small cellular base station , with a directional antenna to receive the signal from the nearest cell tower , an amplifier, and a local antenna to rebroadcast the signal to nearby cell phones.
The first experiments with radio repeater stations to relay radio signals were done in 1899 by Emile Guarini-Foresio. [3] However the low frequency and medium frequency radio waves used during the first 40 years of radio proved to be able to travel long distances by ground wave and skywave propagation. [citation needed]
A wireless repeater (also called wireless range extender or wifi extender) is a device that takes an existing signal from a wireless router or wireless access point and rebroadcasts it to create a second network.
Repeater watches were much harder to make than repeater clocks; fitting the bells, wire gongs and complicated striking works into a pocketwatch movement was a feat of fine watchmaking. So repeating watches were expensive luxuries and status symbols; as such they survived the introduction of artificial illumination and a few are still made today.
A recipe in a cookbook for pancakes with the prepared ingredients. A recipe is a set of instructions that describes how to prepare or make something, especially a dish of prepared food. A sub-recipe or subrecipe is a recipe for an ingredient that will be called for in the instructions for the main recipe. Cookbooks, which are a collection of ...
A common simple topology that cannot be solved by series and parallel combinations is the input impedance to a bridge network (except in the special case when the bridge is in balance). [9] The rest of the transforms in this section are all restricted to use with 2-ports only.