How does a TRF radio work?

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.

What is DSP SDR?

First and foremost, a couple important terms: Software-Defined Radio (SDR): A radio that uses software to perform signal-processing tasks that were traditionally performed by hardware. Digital Signal Processing (DSP): The digital processing of signals, in our case RF signals.

What is super Heterodyning action?

Heterodyning is used to shift one frequency range into another, new frequency range, and is also involved in the processes of modulation and demodulation. The two input frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer.

What is direct tune?

You can enter the receiving frequency directly to tune in. Press OPTION when the input source is “Tuner”. The screen that lets you enter the frequency is displayed. …

What is RTL SDR receiver?

What is RTL-SDR? RTL-SDR is a very cheap ~$25 USB dongle that can be used as a computer based radio scanner for receiving live radio signals in your area (no internet required). Depending on the particular model it could receive frequencies from 500 kHz up to 1.75 GHz.

What is waveform in software defined radio?

Abstract: The waveform in software defined radio (SDR) is the important application software which fulfills the function of communication. The waveform development is one of the most important aspects in the industry of SDR. Based on the SCA specification, we analyze the types of components made up of a waveform.

What is RF image rejection?

The image rejection ratio, or image frequency rejection ratio, is the ratio of the intermediate-frequency (IF) signal level produced by the desired input frequency to that produced by the image frequency. The image rejection ratio is usually expressed in dB.