‰  NOW 35 WPM  ‰  TEXT IS FROM JANUARY 2016 QST  PAGE 30‰

ALL MODE 1 KHZ TO 1R7 GHZ SDR RECEIVER  BUILD THIS SIMPLE AND VERSATILE
HIGH PERFORMANCE RECEIVER FOR JUST A FEW DOLLARS.  JAMES FORKIN, WA3TFS
YOU CAN EASILY BUILD A HIGH PERFORMANCE MULTIMODE SOFTWARE DEFINED RADIO
SDR RECEIVER.  ALSO, YOU CAN BUILD IT FOR VERY LOW COST, AND HAVE A
RECEIVER THAT TUNES FROM 1 KHZ TO ABOUT 1R7 GHZ IN TWO BAND SEGMENTS BELOW
AND ABOVE 30 MHZ.  THE HEART OF THE RECEIVER IS A WIDELY AVAILABLE USB
DONGLE, SEEN IN FIGURE 1, ORIGINALLY INTENDED FOR TELEVISION RECEPTION.
THE DONGLE IS AVAILABLE FOR 10 TO 15 ON THE INTERNET.  ALTHOUGH THERE ARE
SEVERAL VERSIONS OF DONGLES AVAILABLE, THE BEST ONE FOR THIS APPLICATION
EMPLOYS THE R850T TUNER.  THE ONLY CONNECTION TO YOUR COMPUTER IS VIA A USB
EXTENSION CABLE THAT ATTACHES THE DONGLE TO YOUR COMPUTER.  I INSTALLED TWO
RF ANTENNA JACKS ONE FOR 1 KHZ TO 30 MHZ INPUT AND ONE FOR ABOVE 30 MHZ.
THE 1 KHZ TO 30 MHZ ANTENNA INPUT IS ALWAYS CONNECTED THROUGH A LOW PASS
FILTER AND AN UPCONVERTER CIRCUIT, AS SEEN IN FIGURE 2.  IN THE LOW
FREQUENCY POSITION, S1 ALSO ROUTES POWER TO THE UPCONVERTER.  SELECT THE
ABOVE 30 MHZ ANTENNA JACK WITH SWITCH S1.  DONGLE SOFTWARE AND HARDWARE
SEVERAL VERSIONS OF FREE SOFTWARE ARE AVAILABLE FOR DOWNLOAD FROM THE
INTERNET.  I USE SDR SDRSHARP WITH MY RECEIVER.  YOU CAN DOWNLOAD AND LEARN
ALL THATS NECESSARY TO INSTALL AND CONFIGURE THE SOFTWARE AT WWW.
‰  END OF 35 WPM TEXT  ‰  QST DE W1AW  ƒ