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2. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   Used as base station antennas for land mobile radio systems such as police, fire, ambulance, and taxi dispatchers, and sector antennas for cellular base stations. Curtain array A curtain array is any one of several designs for large, directional, long-distance, broadside transmitting array antennas used at HF by shortwave broadcasting stations ...

3. Linear amplifier - Wikipedia

   en.wikipedia.org/wiki/Linear_amplifier

   Some commercially manufactured one to two kilowatt linear amplifiers used in amateur radio still use vacuum tubes (valves) and can provide 10 to 20 times RF power amplification (10 to 13 dB). For example, a transmitter driving the input with 100 watts will be amplified to 2,000 watts (2 kW) output to the antenna.

4. Collinear antenna array - Wikipedia

   en.wikipedia.org/wiki/Collinear_antenna_array

   Collinear dipole array on repeater for radio station JOHG-FM on Mt. Shibisan, Kagoshima, Japan. In telecommunications, a collinear antenna array (sometimes spelled colinear antenna array) is an array of dipole or quarter-wave antennas mounted in such a manner that the corresponding elements of each antenna are parallel and collinear; that is, they are located along a common axis.

5. RF power amplifier - Wikipedia

   en.wikipedia.org/wiki/RF_power_amplifier

   A radio-frequency power amplifier (RF power amplifier) is a type of electronic amplifier that converts a low-power radio-frequency (RF) signal into a higher-power signal. [1] Typically, RF power amplifiers are used in the final stage of a radio transmitter , their output driving the antenna .

6. List of amateur radio transceivers - Wikipedia

   en.wikipedia.org/wiki/List_of_amateur_radio...

   Retevis RT87 handheld radios. Retevis is the brand of chinese based company Shenzhen Retevis Technology Co., Ltd. headquartered in Shenzhen,China. [40] UHF/VHF radios: Retevis RA89 (7 Watt) Retevis RA685 (5 Watt) Retevis RT87 (5 Watt IP 66) Retevis RT95 (20 Watt mobile radio) Retevis RT3S (5 Watt DMR)

7. Tower Mounted Amplifier - Wikipedia

   en.wikipedia.org/wiki/Tower_Mounted_Amplifier

   A Tower Mounted Amplifier (TMA), or Mast Head Amplifier (MHA), is a low-noise amplifier (LNA) mounted as close as practical to the antenna in mobile masts or base transceiver stations. A TMA reduces the base transceiver station noise figure (NF) and therefore improves its overall sensitivity; in other words the mobile mast is able to receive ...