Archive

2023

• Solar Boat 2 (1)
• FreeDV blog activated (0)
• FreeDV Update – Sep 2023 (5)
• FreeDV Update March – August 2023 (0)

2022

• Improving FreeDV 2020 (1)
• FreeDV Activity Day (0)
• Measuring HF Noise Around a City (3)

2021

• Measuring Urban HF Noise with a Loop (1)
• Open IP over VHF/UHF 5 (6)
• Sox play Desktop Application for Ubuntu File Manager (1)
• VQ Index Optimisation (3)
• Controlled FreeDV Testing (1)
• Subset Vector Quantiser (0)
• Simple FreeDV API Examples (0)
• Codec 2 HF Data Modes Part 3 (6)
• Codec 2 HF Data Modes Part 2 (1)

2020

• FreeDV 700E and Compression (0)
• Open IP over VHF/UHF 4 (0)
• Open IP over VHF/UHF 3 (4)
• Speech Spectral Quantisation using VQ-VAE (1)
• FSK LDPC Data Mode (14)
• RTLSDR Strong Signals and Noise Figure (2)
• Playing with PAPR (5)
• Open IP over VHF/UHF 2 (3)
• M17 Open Source Radio (4)
• 4FSK on 25 Microwatts (3)
• Resistance is Useless (1)
• Open IP over VHF/UHF 1 (19)
• Codec 2 HF Data Modes 1 (3)
• Effective Altruism (0)
• MicroHams Digital Conference (MHDC) 2020 (7)
• FreeDV Beacon Maintenance (2)
• COVID-19 and Appreciation (0)
• COVID-19 Time Series Analysis (14)
• Visualing Phase Noise (3)

2019

• FreeDV between Argentina and the UK (0)
• FreeDV 2020 over the QO-100 Satellite (2)
• VDSL versus HF Radio (5)
• Codec 2 700C Equaliser Part 2 (9)
• SM1000 V2 Firmware (4)
• OFDM Frequency Acquisition Revisited (0)
• Codec 2 700C Equaliser (2)
• Codec2 and FreeDV Update (1)
• FreeDV 2020 First On Air Tests (13)
• FreeDV QSO Party 2019 Part 2 (0)
• Generating Wideband Speech from Narrowband (0)
• LPCNet Quantiser – wideband speech at 1700 bits/s (3)
• FreeDV QSO Party 2019 Part 1 (1)
• Using D-STAR with Codec 2 (0)
• LPCNet and Codec 2 Part 2 (4)

2018

• ARM NEON Optimisation (5)
• Codec 2 and TWELP (6)
• LPCNet meets Codec 2 (5)
• LPCNet – Open Source Neural Net Speech Synthesis (0)
• Codec 2 2200 Candidate D (2)
• Porting a LDPC Decoder to a STM32 Microcontroller (7)
• Tony K2MO Tests FreeDV (0)
• Simple Keras “Hello World” Example – Mean Removal (1)
• Band Pass Filter and Power Amplifier for Simple HF Data (2)
• How Fourier Transforms Work (1)
• Testing a RTL-SDR with FSK on HF (4)
• Rpitx and 2FSK (5)
• Prototyping FreeDV 2200 (2)
• Codec 2 2200 (6)
• A Visit to the Home of FreeDV and Codec 2 (1)
• Horus Binary Telemetry and FreeDV (9)
• Codec 2 at 450 bit/s (16)
• Rowetel Blog Post Archive (3)
• Bench Testing HF Radios with a HackRF (1)
• FreeDV 700D Released (6)
• FreeDV 700D Part 4 – Acquisition (5)
• FreeDV 700D and SSB Comparison (1)
• FreeDV 1600 Sample Clock Offset Bug (2)
• FreeDV 700D Part 3 (12)
• Solar Boat (1)
• WaveNet and Codec 2 (16)
• Lithium Cell Amp Hour Tester and Electric Sailing (0)
• Testing HAB Telemetry Protocols (6)
• Measuring SDR Noise Figure in Real Time (2)
• Engage the Silent Drive (3)

2017

• How Inlets Generate Thrust on Supersonic aircraft (0)
• Steve Ports an OFDM modem from Octave to C (7)
• New Lithium Battery Pack for my EV (2)
• QSO Today Podcast (0)
• Codec 2 Wideband (5)
• LilacSat-1 Codec 2 in Space! (2)
• FreeDV 2017 Road Map (0)
• Urban HF Noise (2)
• FreeDV 700D – First Over The Air Tests (5)
• Towards FreeDV 700D (4)
• Cafe Dark Ages (10)
• AMBE+2 and MELPe 600 Compared to Codec 2 (14)
• Codec 2 700C and Short LDPC Codes (3)
• Testing FreeDV 700C (14)
• FreeDV 700C (6)
• Modems for HF Digital Voice Part 2 (2)
• Modems for HF Digital Voice Part 1 (1)
• CMA Equalisation of FSK (15)
• OQPSK Modem Simulation (2)
• Codec 2 700C (70)

2016

• Physics of Road Rage (3)
• Horus 39 – Fantastic High Speed SSDV Images (1)
• Balloon Meets Gum Tree (0)
• Horus 37 – High Speed SSTV Images (0)
• SM2000 – Part 8 – Gippstech 2016 Presentation (4)
• Codec 2 Masking Model Part 5 (3)
• SM2000 Part 7 – Prototype Ready for Manufacture (7)
• FreeDV 2400A and 2400B Demos (5)
• Project Whack a Mole Part 2 (2)
• Organic Potato Chips Scam (10)
• Making my 32kHz Crystal Oscillator Actually Oscillate (10)
• FreeDV 2400A (9)
• SM2000 Part 6 – PCB Layout (3)
• High Speed Balloon Data Link (5)
• Measuring SDR Noise Figure (3)
• Codec 2 Masking Model Part 4 (7)
• Torturing the Clutch in my EV (3)
• Project Whack a Mole Part 1 (6)
• Codec 2 Masking Model Part 3 (2)
• Double Tuned Filter Notch Mystery (3)
• Binary Telemetry Protocol (6)

2015

• FreeDV 2016 Road Map (2)
• FreeDV Beacon (6)
• The Bishops Boys (5)
• SM2000 Part 5 – PA Filter and Self Resonance (3)
• Capacitance Multiplier? (2)
• SM2000 Part 4 – Tx Amplifier Chain (3)
• SM2000 Part 3 – PIN TR Switch and VHF PA (2)
• SM2000 Part 2 – RF Amp Design (2)
• SM2000 Part1 – Open VHF Digital Voice Radio (7)
• Give Us Our Daily Bread (11)
• Modems for VHF Digital Voice (23)
• Simulating the DMR Modem (5)
• All Your Modem are Belong To Us (14)
• SNR and Eb/No Worked Example (2)
• Codec 2 Masking Model Part 2 (1)
• Phase from Magnitude Spectra (1)
• FreeDV Voice Keyer and Spotting Demo (0)
• FreeDV QSO Party Weekend (4)
• Testing the FreeDV API (0)
• LDPC using Octave and the CML library (1)
• FreeDV SM1000 v SSB demo (6)
• Dual Rav 4 Codan NGT SM1000 Installation (0)
• Codec 2 Masking Model Part 1 (13)
• A Miserable Debt Free Life Part 2 (4)
• Hamburgers versus Oncology (3)
• Is Alt-Med Responsible for 20% of Cancer Deaths? (1)
• OLPC and Measuring if Technology Helps (1)
• A Miserable Debt Free Life (37)
• FreeDV Robustness Part 7 – FreeDV 700B (2)
• Advanced VHF Digital Radio using Codec 2 (0)
• FreeDV QSO Party Weekend – September 12/13th (0)
• Low Order LPC and Bandpass Filtering (16)
• Microphone Placement and Speech Codecs (5)
• Self Driving Cars (5)
• FreeDV Robustness Part 6 – Early Low SNR Results (4)
• 8 Mega Watts in your bare hands (0)
• Trellis Decoding for Codec 2 (10)
• WTF Internal Combustion? (4)
• FreeDV Robustness Part 5 – FreeDV 700 (2)
• New Charger for my EV (0)
• Lower SNR limit of Digital Voice (2)
• SM1000 Part 13 – Shipping! (15)
• Minimalist VHF Software Defined Radio Part 2 (8)
• SM1000 Part 12 – Testing in the US (3)
• FreeDV and Codec 2 2015 Road Map (24)
• SM1000 Part 11 – Accepting Pre-orders! (30)
• Minimalist VHF Software Defined Radio Part 1 (30)
• Codec 2 and GMSK over VHF Radio Part 1 (24)
• SM1000 Part 10 – First Over the Air Tests (6)

2014

• GMSK Modem Simulation (9)
• FSK over FM (16)
• SM1000 Part 9 – First Betas (3)
• SM1000 Part 8 – Video and Beta CAD work (3)
• OpenRadio Part 3 – Filters (1)
• FreeDV Robustness Part 4 (5)
• OpenRadio Part 2 – Prototype Works! (2)
• OpenRadio – a one day Software Defined Radio project (4)
• JackPair – Secure Phone Calls using Codec 2 (9)
• SM1000 Part 7 – Over the air in Germany (3)
• Degrowth Economy (9)
• SM1000 Part 6 – Noise and Radio Tests (9)
• Timing Estimation for PSK modems (0)
• SM1000 Part 5 – Mysterious Triangle Waves (2)
• SM1000 Part 4 – Killing a PCB and PTT Working (3)
• Do Anti-Depressants work? (5)
• SM1000 Part 3 – Rx Working (4)
• SM1000 Part 2 – Embedded FreeDV Tx Working (4)
• Embedded FreeDV (3)
• SmartMic SM1000 Part 1 (5)
• Democratising HF Radio Part 1 (5)
• Reducing FDMDV Modem Memory (8)
• Energy Equivalents of a Krispy Kreme Factory (4)
• HF Modem Frequency Offset Estimation (7)
• Email to an Anti-Vaxer (8)
• Fixed Point Scaling – Goertzal Tone Detector Example (9)
• SmartMic Prototype PCB Ready for Manufacture (7)
• Fluksometer Update (0)
• wxWidgets Checkbox Tooltips (0)
• Fixing Broken Plastic Fridge Shelves (2)
• Electric Car Running Costs (13)
• ST-LINK between two Discovery Boards (0)
• Microphone Amplifiers (9)
• Introducing the SM1000 Smart Mic (81)
• Scatter Plots and FreeDV (0)
• Charging Strange Camera Batteries (1)
• My Vacuum Pump Won’t Stop! (1)
• Natural and Gray Coding (0)
• Variable Power Quantisation (0)
• Aspitech E-waste Recycling Tour (4)

2013

• Not Activiating Mt Remarkable (1)
• Fox Hunting (3)
• FreeDV Robustness Part 3 (5)
• FreeDV Robustness Part 2 (11)
• FreeDV Robustness Part 1 (2)
• Dead DC-DC converter in my EV (2)
• HF Modem Bit Error Patterns (7)
• linux.conf.au (LCA) 2013 (0)
• Coherent PSK Demodulation on HF (7)

2012

• My First FreeDV Contact (1)
• FreeDV (20)
• HTML Bison Adventure (2)
• Codec 2 at 3200 bit/s (3)
• LPC Post Filter for Codec 2 (2)
• Codec 2 wins the ARRL Technical Innovation Award (10)
• Web Site Updates (0)
• ISIF award for Dili Village Telco (1)
• FDMDV Modem Page (1)
• Testing a FDMDV Modem (29)
• Intermittent EV (0)
• Busting Teenage Partying with a Fluksometer (23)
• linux.conf.au (LCA) 2012 (2)

2011

• 28,000 Electric km (7)
• Codec 2 at 1400 bits/s (50)
• My IP04 hacked and SIP ALG (10)
• Driving the Nissan Leaf (5)
• Writing as Therapy (10)
• Simple Low Pass Digital Filter Design (2)
• Microwave Design and Why Experience Matters (1)
• Resonant Feed Line Antenna for 40m (3)
• $10 ATA Part 5 – Ringing a Phone with a DC-DC Converter (6)
• $10 ATA Part 4 – Building a DC-DC converter with a microcontroller (7)
• $10 ATA Part 3 – Hybrid (19)
• Flower Pot Antenna and Wifi Sleeve Dipoles (4)
• Carlitos Way (2)
• linux.conf.au (LCA) 2011 (4)
• Horus 14 – Tux in (near) Space (0)
• Dili Village Telco Part 11 – State of the Mesh (0)
• IP0X Price Drop and Atcom IP Phones (0)
• Dili Village Telco Part 10 – End Users (0)
• Codec 2 Over the Air (2)
• Baucau Village Telco Part 2 (0)

2010

• Testing Codec 2 Algorithms (0)
• Codec 2 V0.1A (1)
• Fixed Point Scaling – Low Pass Filter example (16)
• Mesh Potato Spectrum Analyser (7)
• Baucau Village Telco (4)
• Ermera Village Telco (0)
• Production Mesh Potatoes (0)
• 2010 EV Festival (5)
• Audio Ping and Tuning Mesh Networks (11)
• Codec 2 – Alpha Release and Voicing (1)
• Equalising Lithium EV Batteries (3)
• Hybrid Optical-Microwave Communications (0)
• ExtremeCom 2010 Part 2 (1)
• ExtremeCom 2010 Part 1 (0)
• IP0X Web Firmware Updates (7)
• Dili Village Telco Part 10 (2)
• Codec2 V0.1 Alpha Released (2)
• Wifi is Hard (9)
• Air Stream Kilkenny Part 2 (4)
• Science Alive (0)
• 2.1km Mesh Potato Call (7)
• Blown Armature (1)
• 2010 Travel (1)
• Rowetel 2.0 Web Site (4)
• Serval Arkaroola Demo (0)
• Mesh Potato V1.3 (0)
• Dili Village Telco Part 9 – The Network builds (1)
• Dili Village Telco Part 8 – April Trip Summary (2)
• Dili Village Telco Part 7 (1)
• Dili Village Telco – The Scooter (0)
• Dili Village Telco Part 6 (3)
• Dili Village Telco Part 5 (0)
• Dili Village Telco Part 4 (4)
• Dili Village Telco Part 3 (0)
• Dili Village Telco – Small Business in Timor (0)
• Dili Village Telco Part 2 (1)
• Dili Village Telco Part 1 (4)
• Debugging the EV (4)
• Prescription for The Planet – Tom Blees (9)
• Low Energy Pool (17)
• Mini Asterisk GUI (6)
• linux.conf.au (LCA) 2010 (3)
• Wifi Phone call using 17mm of PCB track (0)
• How not to connect to microstrip (7)
• First Mesh Potato Beta Experience (0)
• The Amazing Louis Palmer (1)
• Baboons, Mesh networks, and Community (0)

2009

• Electric Car BMS Controller (5)
• Lithium Batteries for my EV (11)
• Mesh Potato Antenna Testing (0)
• Transmitting Continuous Wifi Signals (0)
• 800m Mesh Potato Phone Call (0)
• Measuring Wifi Transmit Power (1)
• Flukso – Wifi Household Power Logging (34)
• EV Bugs (6)
• My Site Hacked and the Recovery (2)
• Open Source Low Rate Codec Part 4 – Zero Phase Model (14)
• Open Source Low Rate Speech Codec Part 3 – Phase and Male Speech (11)
• Open Source Low Rate Speech Codec Part 2 (7)
• Open Source Low Rate Speech Codec Part 1 (32)
• Fuel Consumption of a Pedestrian Crossing (12)
• Second Village Telco Workshop (0)
• Taking the MPs for a Spin in the EV Part 2 (4)
• Mesh Potato Testing and Free Potatoes (0)
• Royalty Free Codecs (15)
• EV Battery Tester (3)
• QRSS Beacon (5)
• Commercial EVs Reveal Pricing (2)
• First Mesh Potato Phone Call (3)
• Finding Shorts (7)
• Escape from Boot Loader Hell (1)
• Kjell Aleklett Lecture (5)
• Breathing Life into the Mesh Potato – Day 1 (0)
• East Timor – OLPC Pilot #2 (0)
• First Phone Call on MP Architecture (0)
• Metro Mesh Networks for East Timor (1)
• East Timor Trip 2 (1)
• Mesh Telephony (0)
• Mesh Potato FXS Interface (0)
• A Drive in the Tesla (0)
• Building an EV in 1 week – Day 3 (15)
• Building an EV in 1 week – Day 2 (0)
• Building an EV in 1 week – Day 1 (3)
• A Drive in the Mitsubishi MIEV (12)
• The Amazing Rocket Stove (6)
• East Timor – OLPC Pilot (5)
• What I would do with $43B (7)
• Taking the MPs for a Spin in the EV (7)
• Low Cost EVs (22)
• East Timor – Cultural and IT (6)
• East Timor – We really do have road rules now! (4)
• Prototype Village Telco Raided (1)
• Victorian Bushfires – What to Do? (8)
• Mesh Potato Phase 2 – hardware design (1)
• linux.conf.au 2009 (2)
• Green Car Innovation Fund (2)
• HF Mesh Radio (15)
• Summer Ham Project (1)
• EV Tales (0)
• Living with an Electric Car (3)
• Connection to dragonballz closed (1)

2008

• IP01 – SOHO Asterisk Appliance (7)
• The Mesh Potato Part 2 (8)
• Building an Electric Car Part 2 (13)
• Peak Oil and Why Growth is Evil (9)
• Open GSM Base Station (8)
• Open Hardware 3 Years On (16)
• Free Telephony Family Tree (5)
• Driving Strike (1)
• The Mesh Potato Part 1 (40)
• VOIP for Nine Year Olds (9)
• WiSPCaR – Wifi Station Power Controller And Reporter (20)
• IP04 at Burning Man (0)
• Monitoring Asterisk with Munin and Smokeping (3)
• Oslec-ATA Smackdown (6)
• Low Power Asterisk – 4 telephones on 3W (11)
• Solar Electricity (6)
• Air-Stream Kilkenny (4)
• The Village Telco – VOIP over Community Wifi (6)
• Embedded Asterisk in Nigeria (4)
• FreePBX for Embedded Asterisk (18)
• VOIP for the Deaf (1)
• Linux.conf.au (LCA) 2008 (6)
• Building an Electric Car Part 1 (13)
• Halving My Gas and Electricity Bills (46)
• Gyrator DC Characteristic (5)
• High Speed Digital Bug (2)
• Aquaponics (8)

2007

• $10 ATA Part 2 (14)
• Prototype IP08 (15)
• Asterisk Appliance Survey (12)
• Asterisk on a FPGA (9)
• Floatron for a Low Energy Pool (89)
• Peak Oil (17)
• Open Hardware Battery Charger (0)
• Building an Embedded Asterisk PBX Part 4 (7)
• Great Experience with Toshiba Laptop Repair (1)
• Open Source Echo Canceller Part 5 – Ready for Beta Testing (26)
• 8 Port Low Cost FXS USB Channel Bank (2)
• The Louder Router – a low cost PC for the Blind (12)
• Freest Phone call ever? (4)
• IP04 and the Asterisk Appliance (10)
• Building an Embedded Asterisk PBX Part 3 (42)
• A $10 ATA (37)
• Improved Dragging on gEDA PCB (5)
• Open Source Echo Canceller Part 4 – First Phone Calls (4)
• Open Souce Echo Canceller Part 3 – Two Prototypes (1)
• Open Source Echo Canceller Part 2 – How Echo Cancellers Work (7)
• Building a BlackfinOne (34)

2006

• EMI Testing 101 (12)
• Open Source Echo Canceller Part 1 (4)
• Building an Embedded Asterisk PBX Part 2 (21)
• Building an Embedded Asterisk PBX Part 1 (47)
• Open Source Hardware (15)
• Icarus Verilog Mini How To (10)
• How To Make Your Kids Rich (4)
• Roads and Wealth Creation (6)
• A Bit Exact DSP Fairy Tale (1)
• Renumbering components using Perl (0)
• Using Make to build hardware (0)
• How to make your Blackfin fly Part 2 (4)
• GSM Port for the Blackfin (0)
• How to make your Blackfin fly Part 1 (5)
• Measuring Stack Usage in Multi-threaded uClinux Apps (3)
• Porting multi-threaded apps to uClinux (8)
• The YouBox – Hardware for YouOS (1)