A simple CW transmitter and reciever
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A simple CW transmitter and receiver uses continuous wave radio signals to transmit and receive information. It consists of an RF amplifier, detector, and audio amplifier. Transmission is achieved by switching the RF signal on and off using a process called "keying". The detector stage mixes the received RF signal with a local oscillator signal to extract information. This simple design can be used for applications like CW radar to detect objects by transmitting and receiving bounced signals and applying the Doppler effect to determine object properties.
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A simple CW transmitter and reciever
- 1. A simple CW transmitter and reciever
- 2. Definition: Continuous waves(CW) are electromagnetic waves that have a fixed frequency and amplitude, usually of a sinusoidal wave. A simple CW transmitter and receiver uses continuous waves to transmit and receive radio frequency(RF) signals. 2
- 3. Components: A very simple CW tranceiver(transmitter and receiver) consists of a RF amplifier, a detector and an audio amplifier. Detector stage also consists of a frequency oscillator. 2
- 4. Working: The transmission of CW is basically done by switching on and off of the RF signal source/power. Power supply is alternated to various stages of the device, this is known as "Keyeing". Keyeing can be done to oscillator, amplifier or the driver stage. Usually done to driver stage. The detector stage consists of a "beat frequency oscillator(BFO), which produces a local RF signal(continued next slide). 2
- 5. Working(continuation): This local signal is "mixed in" with the received RF signal, differential signal is taken as output. Output is then passed onto final stage. 2
- 6. Working (applicative): This simple functioning can be used further, for example in the form of a CW radar. Transmits RF signal to an object, then receives the bounced back signal to determine further properties of said object. This is done by application of the Doppler effect. 2
- 7. Doppler Effect: Doppler effect is a phenomenon where frequency of an electromagnetic wave changes in accordance to the motion of the source of said EM wave. 2
- 8. Application: Semi-Active Radar Homing(SARH) air-to-air missile. Object detection technology Velocity measuring devices(used by traffic police, in sports such as NASCAR and tennis). 1. 2. 3. 2
- 9. Thank you. By Mohd. Adnan Liyakhat Pathan