‰  NOW 40 WPM  ‰  
BOARD, AS THIS WAS THE NEXT STEP IN MAKING THE MDSR DEVELOPMENT APPEAL TO
MORE AMATEUR RADIO OPERATORS.  THE LIF2016 SMD PCB IS SHOWN IN THE LEAD
PHOTO.  THIS ROBOT ASSEMBLED DESIGN CONSISTS OF TWO LAYERS, AND HAS MORE
THAN 95 GROUND PLANE COVERAGE.  THE DOWNCONVERTER HARDWARE IS SMALL ENOUGH
TO FIT INTO MOST TRANSCEIVERS INTERNALLY.  IT IS PIN COMPATIBLE SEE FIGURE
2 WITH THE YF 122 CRYSTAL FILTER THAT FITS INTO THE OPTION FILTER SPACE OF
MANY YAESU TRANSCEIVERS SEE FIGURE 3. 

OPENS UP A WHOLE NEW WORLD OF RECEPTION.  THE BILIF IS A BI DIRECTIONAL
VERSION OF THE LIF BOARD THAT PERMITS SDR TRANSMISSION AS WELL AS
RECEPTION.  CONNECTABILITY  THE MDSR SYSTEM CAN BE SET UP TO USE TWO SOUND
CARDS ONE HIGH END 24 BIT CARD TO DO THE IF DEMODULATION, AND A LOWER 16
BIT ONBOARD SOUND CARD FOR HANDLING BASEBAND DIGITAL COMMUNICATIONS
SOFTWARE SUCH AS WSPR, JT65, AND JT9.  THE MDSR SETUP IS A FREE PROGRAM.
IT ALSO INCLUDES FLDIGI WITH ITS EXTENSIVE CHOICE OF DIGITAL MODES.
PROGRAMS IN THE MDSR SUITE INCLUDE MDSR PROVIDES THE GRAPHIC USER INTERFACE
THAT CONTROLS THE TRANSCEIVER VIA THE OMNIRIG CAT TRANSLATOR AND THE DSP
ENGINE FOR AUDIO PROCESSING MDSR SA PROVIDES A FAST SPECTRUM ANALYZER, THE
OMNIRIG SETUP UTILITY, AND PRESET FREQUENCY BANKS PM MANAGER THE PROFILE
MANGER IS A BACKUP UTILITY THAT ALSO STORES PROFILES FOR DIFFERENT SETUPS,
SUCH AS DIGITAL SETUP OR ANALOG SETUP.  IT CAN ALSO BE USED TO STORE
PROFILES TO CONTROL DIFFERENT TRANSCEIVERS.  ONCE A PROFILE IS ESTABLISHED,
IT CAN EASILY BE RECALLED OMNIRIG TRANSLATES THE CAT PROTOCOLS OF OVER 100
DIFFERENT RADIO MAKES AND MODELS SO THAT MDSR CAN CONTROL THEM REMOTELY

MODULATION DEMODULATION SOFTWARE RADIO  MAKE YOUR OWN IF SOFTWARE DEFINED
RADIO SDR FROM AN EXISTING TRANSCEIVER, AND MEASURE PROPAGATION PHENOMENA
WITH MDSR AND SCANNING RF SEISMOGRAPH SOFTWARE.  ALEX SCHWARZ, VE7DXW THIS
ARTICLE IS BASED ON THE AUTHORS WORK PUBLISHED BY THE RADIO SOCIETY OF
GREAT BRITAIN, RADCOM OCT.  2016, VOL. 92, NO. 10.  TODAYS ANALOG
RECEIVERS, EVEN LOWER END ANALOG RADIOS, HAVE A DYNAMIC RANGE IN EXCESS OF
80 DB, AND ARE VERY AFFORDABLE.  THE MODULATION DEMODULATION SOFTWARE RADIO
MDSR SYSTEM ALLOWS THESE OLDER, PERFECTLY FUNCTIONAL RADIOS TO GET A SECOND
LEASE ON LIFE.  THE LOW INTERMEDIATE FREQUENCY LIF CONCEPT USES THE 455 KHZ
IF, AND DOWNCONVERTS IT TO 12 KHZ, WHERE IT CAN BE PROCESSED BY A SOUND
CARD.  ONCE THE SIGNAL IS DIGITIZED, THE DIGITAL SIGNAL PROCESSOR DSP
ENGINE OF THE MDSR SOFTWARE CAN PROVIDE SHARP IF FILTERS, NOTCH FILTERS,
AND A WHOLE RANGE OF SDR LIKE FEATURES THAT MOST ANALOG RIGS LACK.  THE
MDSR SOFTWARE ALSO ADDS A REAL TIME SPECTRUM ANALYZER FOR FAST TUNING AND A
REMOTE CONTROL FEATURE THAT IS EASY TO USE AND TO SET UP.  AT THE COST OF
AN LIF CONVERTER PRINTED CIRCUIT BOARD PCB SEE THE LEAD PHOTO, AND THE TIME
SPENT TO CONNECT THE TRANSCEIVER AND THE COMPUTER TOGETHER, THE MDSR SYSTEM
OUT PERFORMS MANY SDRS AVAILABLE ON THE MARKET TODAY.  COMBINED WITH A 24
BIT SOUND CARD, WHICH HAS A DYNAMIC RANGE OF ABOUT 120 DB, THE RECEIVER
‰  END OF 40 WPM TEXT  ‰  QST DE W1AW  ƒ