VHF/UHF/MICROWAVE SDR TRANSCEIVER ON THE AIR
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1 VHF/UHF/MICROWAVE SDR TRANSCEIVER ON THE AIR John Petrich, W7FU PNWVHFS 2016 Conference Bend, OR October 8, 2016
2 VHF/UHF SDR - home station 2
3 Microwave SDR - rover station 3
4 4 Agenda Overview: the now advanced communications technology available to us What is under the hood: VHF/microwave SDR (any SDR) hardware and software Performance measures: spurs, phase noise How To: VHF/microwave SDR system with photos
5 5 Overview Advanced SDR technology has transformed radio communications systems design Modern DSP combined with state of the art analog signal processing permit exceptional frequency coverage, exceptional signal quality, and integrated packaging
6 6 Overview Same principle as your great modern HF transceiver - but more so. Not for every ham today, but on the ham radio horizon e.g. AMSAT Phase 4 Satellite
7 7 What s under the hood? VHF / Microwave multi-mode SDR Transceiver Direct conversion to RF from digital baseband Single board solution with open source DSP software
8 8 SDR Description Hardware Ettus Research B210 SDR transceiver single board solution (6 x 4 ) or (3.25 x 2 ) State of the art RF & baseband performance TX RF output > +5 dbm, RX ~2+ db NF Software DSP GNU Radio open source software DSP library Linux, Windows OS platform Graphical DSP authoring
9 9 Advanced SDR Hardware Ettus USRP B210 SDR Transceiver
10 10 Advanced SDR Hardware Ettus USRP B200 SDR Transceiver
11 11 Advanced DSP Software GNU Radio Open source DSP library: (Linux, Windows, OSX, OS) Graphical DSP authoring simplified Optimized for real time signal processing (VOLK, C++ API) Supports transmit and receive DSP
12 12 GNU Radio DSP Flow Graph SSB Phasing Transmitter DSP
13 GNU Radio DSP GUI 13
14 14 Performance Measures Receiver Filter Bandwidth optimized for UHF operation Transmitter Spurious Output and Phase Noise
15 15 Receiver Bandwidth Spectrum Receiver Bandwidth 3 khz
16 16 Microwave Spectral Purity Wideband Transmit 2.3 GHz
17 17 VHF Harmonic Analysis Harmonic 144 MHz (typical)
18 18 Microwave Phase Noise Phase Noise: 5.8 khz RBW
19 19 Microwave Transmit Linearity Two Tone LSB: 5.8 khz RBW
20 20 SDR: The New Normal? Near ideal signal processing ability: digital determinism Wide design flexibility supports all existing available amateur radio bandwidths Integrates well with existing RF systems simplifies system design Size and weight attractive compared to analog counterparts
21 21 How to: VHF/UHF/Microwave SDR How it is done? What is involved? What does a VHF/microwave SDR actually look like?
22 22 Typical Analog Ham VHF System HF Transceiver Linear Up-converter LNA Power Amplifier T/R switching High performance HF transceiver Outboard Linear Up-converter(s) per band Custom per band antenna interface
23 23 Advanced SDR Ham VHF Radio System SDR Transceiver LNA Power Amplifier T/R switching High performance direct conversion SDR broadband transceiver (and peripheral) Custom per band antenna interface
24 24 VHF/Microwave SDR Station Experimenter s station implemented using modular construction: 1) Broadband SDR module 2) Broadband RF Interface module 3) SDR Peripheral station control module 4) Band specific power amplifiers, antennas
25 SDR module 25
26 26 SDR RF Interface The Interface links the SDR with the rest of the RF system Receiver input protection relay with termination Transmitter low level intermediate amplifier
27 SDR RF Interface 27
28 28 SDR Peripheral The Peripheral links the SDR and rig control functions: OCXO Keying circuits Memory keyer PTT and amplifier control T/R relay Power distribution system keyed & unkeyed
29 SDR Peripheral 29
30 Power Amplifier Modules 30
31 Complete SDR Rover Station 31
32 32 What Next? 10 GHz, of course! 10 GHz Transceiver simplified: B-210 dual transceiver SDR 10 GHz Double Balanced Mixer High-pass filter Preamp, Amp, TX/RX relay and antenna (and, I don t need fancy test equipment!)
33 10 GHz SDR Transceiver 33
34 34 In Conclusion I want to thank Michael Garrett, AC9LM, Barry Hansen, K7BWH, Phil Horkin, AG7GY, Mariana Varotto, WA7EE For their generous assistance with this project Thanks also to the PNWVHFS for the opportunity to present this project
35 35 Down the Slippery Slope More information about DSP and SDR Additional learning opportunity with the SDR-SIG Meets on the odd month, third Tuesday 6:00-7:30 Facebook: PNW SDR SIG (SDR-SIG information)
36 36 FAQ s: Hardware Q: Are there UHF/ Microwave SDR transceiver hardware alternatives? A: Yes: and Q: Isn t the Ham Shield Arduino (VHF/UHF transceiver) a SDR? A: Yes, by all means. Wonderful design, with a different purpose, not compatible with GNU Radio
37 37 Additional Questions? Hardware? Software? Other related topics?
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