UHF SDR TRANSCEIVER AND HAM RADIO SYSTEM. John Petrich, W7FU MicroHAMS Digital Conference March 19, 2016
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1 UHF SDR TRANSCEIVER AND HAM RADIO SYSTEM John Petrich, W7FU MicroHAMS Digital Conference March 19, 2016
2 2 Agenda Advanced IC and SDR technology: UHF SDR project description SDR project photos and performance data The journey to a UHF SDR system: perspective from traditional analog systems and opportunities with SDR designs
3 3 Advanced IC and SDR Technology UHF / Microwave Multi-mode Direct Conversion SDR Transceiver Single board solution with open source DSP software
4 4 SDR Project Description Hardware Ettus Research B200 SDR transceiver single board solution (6 x 4 ) 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, Ubuntu OS platform Graphical DSP authoring
5 5 Advanced SDR Hardware Ettus USRP B200 SDR Transceiver
6 6 Advanced SDR Hardware Ettus USRP B200 SDR Transceiver
7 7 Advanced SDR Hardware Analog Devices 9364 RFIC
8 8 Advanced DSP Software GNU Radio Open source DSP library, (Linux, Ubuntu OS) Graphical DSP authoring simplified Optimized for real time signal processing (VOLK, C++ API) as different from modeling Supports transmit and receive DSP UHD (Universal Hardware Driver) interface, developed and maintained in conjunction with Ettus USRP
9 9 GNU Radio DSP Flow Graph SSB Phasing Transmitter DSP
10 GNU Radio DSP GUI 10
11 11 Performance Measures Receiver Filter Bandwidth optimized for UHF operation Transmitter Spurious Output and Phase Noise
12 12 Receiver Bandwidth Spectrum Receiver Bandwidth 3 khz
13 13 Microwave Spectral Purity Transmit Spectrum at 5.6 GHz
14 14 Microwave Phase Noise Transmit Phase Noise at 1.2 GHz
15 15 Transition from Analog to SDR The analog system leverages highly developed, high performance HF transceivers sophisticated UHF filter, LNA, and power amplifier technology and proven overall system design Question? Why not improve transceiver performance and operating flexibility with SDR? Why not build on the proven analog system approach with SDR?
16 16 Typical Analog Ham UHF System HF Transceiver Linear Upconverter LNA Power Amplifier T/R switching High performance HF transceiver Outboard Linear Upconverter(s) per band Custom per band antenna interface
17 Advanced SDR Ham UHF Radio System 17 SDR Transceiver LNA Power Amplifier T/R switching High performance direct conversion SDR transceiver Custom per band antenna interface
18 18 VHF/UHF SDR System VHF/UHF SDR Transceiver and ½ W Interface
19 19 UHF/Microwave SDR System UHF/Microwave SDR Transceiver and Antenna
20 20 SDR: The New Normal? Near ideal signal processing ability: digital determinism, can approximate the Shannon limit Wide design flexibility supports all existing available amateur bandwidths Integrates well with existing RF systems Size and weight attractive compared to analog counterparts
21 21 SDR Opportunities with Phase 4 satellite Higher order modulation that allows major increases in data rates, results in more and higher fidelity information throughput: e.g. 256 QAM vs. PSK 31 = >10x data rate! Microwave uplink and downlink
22 22 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 MicroHAMS for the opportunity to present this project at the 2016 MHDC
23 23 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)
24 24 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
25 25 FAQ s: Software Q: Does GNU Radio function with a Windows OS? A: Sorta, hard work with significant limitations. They are working on it. The GNU Radio developers are primarily oriented to Linux OS. Q: How do I get started with GNU Radio? A: That is what and are all about. GRC DSP information oriented to beginners.
26 26 FAQ s: General Q: What about homebrew UHF SDRs? A: Yes. You can make custom software and analog interface system. The FPGAs and RFICs require automated assembly. Q: Where do I turn for more information on VHF/ Microwave opportunities in our area? A: PNW VHF Society is very active locally, sponsors a wide range of operating activities, and a source of good technical information:
27 27 Additional Questions? Hardware? Software? Other related topics?
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