software defined radio (sdr) and its implementation brandon graham w0gpr
TRANSCRIPT
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Software Defined Radio (SDR) and its Implementation
Brandon GrahamW0GPR
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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 End ADC/DAC Computer
R.F.Front End
High QualitySound Card
P.C., Laptop,Netbook, orEmbeddedprocessor
Antenna
I,Q
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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“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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“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 setupFlex 3000
PowerSDR
VAC
DDU Til
VSP Manager
FL-DIGI
WSJT-X
N1MM+
Computer
Com SingleVAC Pair 1VAC Pair 2FireWire
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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.utwente.nl:8901/
• 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.abrohamnealsoftware.com/products.php?cat=10