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A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier. This type of receiver was popular in the 1920s.
The tuned radio frequency (TRF) receiver, invented in 1916 by Ernst Alexanderson, improved both sensitivity and selectivity by using several stages of amplification before the detector, each with a tuned circuit, all tuned to the frequency of the station. [29] [109] [12] [129] [130]
The tuned radio frequency receiver (TRF) consists of a radio frequency amplifier having one or more stages all tuned to the desired reception frequency. This is followed by a detector, typically an envelope detector using a diode, followed by audio amplification.
A 5-tube superheterodyne receiver manufactured by Toshiba circa 1955 Superheterodyne transistor radio circuit circa 1975. A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency.
Frequency range Max bandwidth RX ADC bits TX DAC bits TX capable Sampling rate Frequency accuracy ppm Panadapters / Receivers Host Interface Windows Linux Mac FPGA Aaronia SPECTRAN V6 ECO [1] Pre-built 9 kHz – 8 GHz Up to 120 MHz (2 Rx with 60 MHz each) 16 14 Yes 2 GSPS 0.005 (OCXO option) 2/1 Embedded or True IQ data via 1 x USB 3.1 GEN 1.
The R-390A is a general coverage radio receiver capable of receiving amplitude modulated, code, and frequency shift keying signals. Its tuning range is from 500 kHz to 32 MHz, in thirty-two 1 MHz bands.
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