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Ultrasonic receivers detect an ultrasonic signal emitted by an ultrasonic transmitter at a specific frequency. The received signal is filtered using a band-pass filter circuit that allows only the predetermined frequency range to pass. The output signal is then...
This article discusses simple FM direct conversion radio receivers utilizing a phase-locked loop (PLL). These receivers operate by locking the local oscillator frequency to the input signal. All FM receivers are based on a circuit that combines an oscillator...
RF Cafe visitor David M. requested the scanning and posting of an article from the January 1963 edition of Popular Electronics, authored by Philip Hatfield from the Receiving Tube Department of General Electric. The article describes a straightforward design...
For digital modes, the ideal receiver should be straightforward, featuring front-end selectivity, manually adjustable gain, and an IF filter. Many functionalities found in HF receivers can be implemented through software. In the collection of components, there was a surplus...
Communications between commercial aircraft and the ground can be intriguing, entertaining, and occasionally unsettling. However, radios that can receive the frequency range of approximately 220 MHz to 400 MHz, commonly utilized for both military and commercial aircraft, are not...
The DTMF decoder can be powered by a 9V battery or through a parallel printer port. It is capable of detecting and displaying all 16 DTMF digits on a computer screen in real-time. The accompanying Windows program can run...
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