SDR Receiver
This project is a Software Defined Radio Receiver. It has a frequency range of 24MHz – 1.2GHz. It can demodulate AM, FM, USB, LSB with selectable bandwidths of 600, 2400, 2800, 3200 and 6400Hz. It has a squelch control, automatic gain control and a clarifier control. It provides a "reverse waterfall" display showing the signal power, in shades from blue to yellow, with the signal frequency across the screen and the time history shown from bottom to top. The patterns move up the screen for 20 seconds, with the most recent information shown at the bottom. See the GippsTech 2018 Build your own SDR Presentation for details. It costs around AU$150 and is fascinating and educational to use.
Components of the SDR Receiver:
- Micro USB 5V power Supply
- RTL-SDR Dongle
- USB Extension Cable
- Raspberry Pi 3 computer
- Micro SDHC Card
SDR Receiver display:
- Frequency entry box
- Mode selection:
-Amplitude Modulation (AM)-Frequency Modulation (FM)-Lower Sideband (LSB)-Upper Sideband (USB)
- Bandwidth Selection (kiloHertz)
- Squelch Control
- Volume Control
- Frequency Clarifier
- Reverse Waterfall Display
This is the GNU Radio flowgraph for the SDR Receiver