1 SDR-14 & SpectraVue S o f t w a r e D e f i n e d R a d i o By: Moe Wheatley, AE4JY and Pieter...
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Transcript of 1 SDR-14 & SpectraVue S o f t w a r e D e f i n e d R a d i o By: Moe Wheatley, AE4JY and Pieter...
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SDR-14 & SpectraVueS o f t w a r e D e f i n e d R a d i o
By:Moe Wheatley, AE4JY and Pieter Ibelings, N4IP
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SDR-14 Enabling TechnologiesSeveral technologies became available that enabled this project come together.
• High speed, relatively low cost 14 bit A/D converter chips.
• Companion digital down converter and decimation filter IC to reduce the sample rate and bandwidth and allow high resolution tuning all in the digital domain.
• Relatively low cost, high speed FIFO's to capture the data before sending back to the PC.
• Inexpensive and easy to use USB interface chip allowing >600KB/Sec data transfer back to the PC
• Desktop PC's with enough CPU power to perform high speed FFT's as well as simple demodulation.
• Inexpensive PC software tools for hardware/software/CAD design.
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ADC
CIC Filter
ComplexNCO
66.666 MHzOscillator
FIR Filter
16 Bit IQor Real
Data
II
Q Q
-SINCOS
512K x 16Memory
USBInterface
8 32
PICProcessor
30 MHzLow Pass
Filter
32 to 8 BitMUXCPLD
SDR-14 FFT Spectrum Analyzer -Digital Receiver
NI
QDecimator
Switch
ComplexData
RealData
DirectInput Port
VariableGain
Preamp
HF InputPort
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SDR-14 Applications• Pan adapter applications for radio receivers with IFs in the HF band (8.83 MHz, 10.7
MHz, 21.4 MHz) or 0-200+ MHz using direct input and external filters.
• Contest station and satellite activity monitoring.
• General coverage HF receiver with 1 Hz tuning. Currently supported modes include USB, LSB, CW, AM, FM
• Propagation and beacon monitoring (allows monitoring of the whole HF band at once or any segment of it. )
• Storing spectrum displays up to 30 MHz wide (no demod capability)
• Storing 100 KHz of spectrum to hard drive with full demod and post processing capabilities.
• Full spectrum analyzer functions with marker, averaging, smoothing, max hold, peak search and sub Hz resolution bandwidths.
• Radio astronomy and SETI receiver for the detection of weak signals in noise.
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SpectraVue Software showing 20 meter band.
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SpectraVue Block Diagram
F F TF u n c tio n s
D em o d u la tio nF u n c tio n s
I QD isp la y
So u n d card
In tern alG en erato r
R IF FW av e F i le
S D R - 1 4 2 D F F TD is p lay
3 D F F TD is p lay
W a t e r f a llD isp la y s
C o n t in uumD isp la y
So u n d card
R IF FW av e F i le
F F TP aram et ers
D em o dP aram et ers
InputS ourc e s
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SpectraVue Capabilities
• FFT analysis using 2048 to 262144 point FFT's (real or complex).
• FFT amplitude resolutions from 10dB to .2dB per division.
• FFT amplitude power is in dB referenced to full scale or can be calibrated to dBm.
• Various FFT data view modes including waterfalls and 2D and 3D plots.
• Display markers for accurate amplitude/frequency measurement.
• A continuum display for measuring spectral power over the entire span and/or the peak power within the span.
• Frequency Spans from 5KHz to 30MHz in various step sizes. (using SDR-14 unit)
• Signal demodulation of AM, NBFM, USB, LSB, narrow CW modes when using the 100 KHz Frequency Span and SDR-14 unit.
• Saving and playback of captured spectrum using RIFF .wav files.
• Saving 100 KHz of spectrum to hard drive requires 2.2 GB/hour storage.
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The SDR-14 Setup Menu
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RAW DISPLAYShows in-phase and quadrature waveforms over time.
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2D FFT DISPLAYShows amplitude vs. frequency.
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3D FFT DISPLAYShows amplitude vs. frequency vs. time.
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V WATERFALL DISPLAYShows amplitude vs. frequency vs. time
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H WATERFALL DISPLAYShows amplitude vs. frequency vs. time
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CONTINUUM DISPLAYShows channel power vs. time.
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Decoding AO-40 using AO40RCV and SpectraVue
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Additional Info.
Visit http://www.rfspace.com for more information regarding the SDR-14.
Additional information on SpectraVue can be found at http://www.moetronix.com