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  2. Radio modem - Wikipedia

    en.wikipedia.org/wiki/Radio_modem

    Radio modems are modems that transfer data wirelessly across a range of up to tens of kilometres. Using radio modems is a modern way to create Private Radio Networks (PRN). Private radio networks are used in critical industrial applications, when real-time data communication is need

  3. Free-space path loss - Wikipedia

    en.wikipedia.org/wiki/Free-space_path_loss

    In telecommunications, the free-space path loss (FSPL) (also known as free-space loss, FSL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle-free, line-of-sight (LoS) path through free space (usually air). [1]

  4. Ambient backscatter - Wikipedia

    en.wikipedia.org/wiki/Ambient_backscatter

    Ambient backscatter [1] uses existing radio frequency signals, such as radio, television and mobile telephony, to transmit data without a battery or power grid connection.. Each such device uses an antenna to pick up an existing signal and convert it into tens to hundreds of microwatts of electrici

  5. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    The development of RF CMOS chips, pioneered by Asad Ali Abidi at UCLA during the 1980s and 1990s, allowed low power wireless devices to be made. [ 146 ] The current trend in receivers is to use digital circuitry on the chip to do functions that were formerly done by analog circuits which require passive components.

  6. Amateur radio repeater - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_repeater

    Coaxial cavity RF filter at 2 meter repeater An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher power, so that the signal can cover longer distances without degradation.

  7. E-mu 20K - Wikipedia

    en.wikipedia.org/wiki/E-mu_20K

    E-MU 20K is the commercial name for a line of audio chips by Creative Technology, commercially known as the Sound Blaster X-Fi chipset. The series comprises the E-MU 20K1 (CA20K1) and E-MU 20K2 (CA20K2) audio chips.

  8. Remote radio head - Wikipedia

    en.wikipedia.org/wiki/Remote_Radio_Head

    RRHs can be installed in a low-profile arrangement along a rooftop, or can involve a much higher tower arrangement. When installed at the highest point on a structure (whether a building or a dedicated cell tower), they will be more vulnerable to receiving a direct lightning strike and higher induced lightning levels, compared with those installed in a lower profile manner below the upper ...

  9. Two-ray ground-reflection model - Wikipedia

    en.wikipedia.org/wiki/Two-ray_ground-reflection...

    From the figure the received line of sight component may be written as = {() /}and the ground reflected component may be written as = {() (+ ′) / + ′}where () is the transmitted signal, is the length of the direct line-of-sight (LOS) ray, + ′ is the length of the ground-reflected ray, is the combined antenna gain along the LOS path, is the combined antenna gain along the ground-reflected ...

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