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Published byGeoffrey Barton Modified over 9 years ago
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Software Defined Radio (SDR) and its Implementation Brandon Graham W0GPR
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What is SDR Instead of relying on RLC circuits, a raw, lightly filtered analog signal is converted to the digital domain to be further processed by digital systems RF Front EndADC/DACComputer R.F. Front End High Quality Sound Card P.C., Laptop, Netbook, or Embedded processor Antenna I,Q
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Digital vs Analog Digital Discrete Digital Signal Processing DSP Filtering Phase Frequency Time Power Analog Continuous Filtering Power amplifier
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Flex Radio Manufacturer of SDRs for Industry, Military and Amateur use starting in 2003 HF transceivers ranging from QRP to 100 watts – Flex 1500 – QRP/transverter IF – Signature series – Contest serious radio – *Flex 3000 – *Flex 5000 – *SDR 1000 *discontinued
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“The Feel of the Radio”
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Power SDR Graphical User Interface (GUI) – Radio’s buttons and knobs Signal Processing – Filtering, DSP, Audio input and output shaping, etc Rig control – Frequency, band, tuner Program interface – VSPs, VACs, out to digital modes, logging, ext. aux
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“The Feel of the Radio”
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Computer system/Software VAC – Virtual Audio Cable VSP Manager – Virtual Com/Serial Port Com-0-Com DDU Til Logging Digital Mode Program Remote Operation Processor RAM Screen usage Quirks
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The system setup Flex 3000 PowerSDR VAC DDU Til VSP Manager FL-DIGI WSJT-X N1MM+ Computer Com Single VAC Pair 1 VAC Pair 2 FireWire
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Pros / Cons of SDR over Analog Pros Filter visualization Filter manipulation Control of settings Visually based displays – Panafall, etc. DSP systems and control Cons Quirky Visually demanding Computer intensive Software setup Need for multiple monitors and mouse Not EmComm Ready
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“Let’s Play Radio”
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Remote Operation Controlling computer, not radio Everything must be powered up at radio and ready for control Easier with digital over voice modes Lag Control of accessory programs and screens
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WebSDR University of Twente – Netherlands Website designed for internet linked SDR receivers Mostly centered on ham bands. http://websdr.ewi.utwe nte.nl:8901/ http://websdr.ewi.utwe nte.nl:8901/ http://www.websdr.org / http://www.websdr.org /
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Other SDR Systems $20 Dongle – Nooelec.com SDR SoftRock HPSDR ANAN Genesis Radio Rfspace Google is a friend! Always New stuff added Experimentation vs. “Solid Systems” Many different programs http://www.abrohamne alsoftware.com/product s.php?cat=10 http://www.abrohamne alsoftware.com/product s.php?cat=10
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