$20 SDR Receiver

1
SDRs

• 20 SDR Receiver
• SDR on the cheap

2
How this cheap SDR works?

• Input from an antenna is down sample, filtered
  and passed to an analog to digital converter
  (RTL2832U) the output is then sent to the
  computer.
• All filtering, demodulation and other processing
  is done on the computer.
• Audible output is then played back on the
  computer speakers.

3
What you need?

• Computer with 1.0 GHz CPU
• USB Tuner based on RTL2832U chip
• Antenna
• Special Drivers
• Software
• SDRSharp

4
Compatible USB Devices
Mine came from http//s.dealextreme.com/search/44
326
5
Software - Drivers

• Installation
• Insert the USB tuner on a free USB port. Do not
  install anything from the CD and let windows
  install drivers from Microsoft (they will be
  replaced later).
• Download the Zadig drivers from this location
  http//rtlsdr.org/softwarewindows
• Decompress and run the Zadig.exe file

6
Software Drivers

• Click on Option and select List All Devices

• Choose the one that says Bulk-In, Interface
  (Interface 0). This should be the primary
  endpoint of your RTL device.

7
Software Drivers

• In the box to the right of the green arrow make
  sure WinUSB is chosen - not libusb or libusbk.
  The big button underneath will say Replace
  Driver or Reinstall Driver. Before you proceed
  make sure the USBID matches the VID/PID in the
  hardware table.

8
Software SDRSharp

• Download the latest development version of SDR
  from http//sdrsharp.com
• Unzip it to a folder There is no installer
  which is nice for a change.
• Run SDRSharp.exe and you should see the following
  window.

9
Software SDRSharp

• Set Radio to WFM (wideband FM)
• Set the 'Front End' type from 'Other' to 'RTLSDR
  / RTL2382U'
• Set the center frequency to (88,000,000) This is
  88MHz.
• If all is working the 'Front End' button should
  go from grey text to black text.
• Click on Play.

10
Source of information

• RTLsdr http//rtlsdr.org/
• osmocomSDR http//sdr.osmocom.org/trac/wiki/rtl-s
  dr
• SDRSharp http//sdrsharp.com/
• GNURadio http//gnuradio.org
• RTL Source http//wiki.spench.net/wiki/Gr-baz

Questions? / Live Demo
I hope I didnt put you to sleep, thanks for
listening. Edgar/KC2UEZ