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2. Channel Master - Wikipedia

   en.wikipedia.org/wiki/Channel_Master

   Later products included antenna rotors, amplified antennas and pocket transistor radios, and rebuilt cathode-ray tubes. [ 18 ] After the sale to Avnet, the Channel Master name was used to import and distribute various electronic products, including home and car stereo equipment, turntables, cassette decks, 8-track players, quadraphonic audio ...

3. Preselector - Wikipedia

   en.wikipedia.org/wiki/Preselector

   A preselector is a name for an electronic device that connects between a radio antenna and a radio receiver. The preselector is a band-pass filter that blocks troublesome out-of-tune frequencies from passing through from the antenna into the radio receiver (or preamplifier) that otherwise would be directly connected to the antenna.

4. Preamplifier - Wikipedia

   en.wikipedia.org/wiki/Preamplifier

   An example of a typical high-end stereo preamplifier. A preamplifier, also known as a preamp, is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker. [1]

5. SMATV - Wikipedia

   en.wikipedia.org/wiki/SMATV

   The system consists of a master antenna and a matching transformer to match the balanced antenna with unbalanced cable and amplifiers. [5] Most antennas have an impedance of around 300 Ω. To convert it to 75 Ω, a matching transformer (or balun) is used. For trunk line isolation, a resistive inductive device known as a splitter is used.

6. Traveling-wave-tube amplifier - Wikipedia

   en.wikipedia.org/wiki/Traveling-wave_tube

   TWTAs are commonly used as amplifiers in satellite transponders, where the input signal is very weak and the output needs to be high power. [21] TWTAs used in satellite communications are considered as reliable choices and tend to live beyond their expected lifetime of 15-20 years. [22] A TWTA whose output drives an antenna is a type of ...

7. Precoding - Wikipedia

   en.wikipedia.org/wiki/Precoding

   Precoding is a generalization of beamforming to support multi-stream (or multi-layer) transmission in multi-antenna wireless communications. In conventional single-stream beamforming, the same signal is emitted from each of the transmit antennas with appropriate weighting (phase and gain) such that the signal power is maximized at the receiver output.