Last updated: 2019, December 6 11:33:34
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  • NEC model of figure 8 transmitting loop – owenduffy.net
  • nanovna-H – a summary of the experience so far – owenduffy.net
  • Acrylic plinth for small card modules – CNC router make – owenduffy.net
  • The conjugate match stuff crashes out again – owenduffy.net
  • AD8310 module for HF current probe – owenduffy.net
  • nanovna-H – sweep of a coax line section with OC termination – owenduffy.net
  • nanovna-H – T-Check test – owenduffy.net
  • CNC6040 router project – cut of enclosure for grbl_ESP32 – owenduffy.net
  • nanovna-H – measure ferrite transformer – owenduffy.net
  • nanovna-H – measure ferrite core permeability – owenduffy.net
  • nanovna-H – measure equivalent core loss resistance – owenduffy.net
  • nanovna-H – a ferrite cored test inductor impedance measurement – s21 series vs s11 reflection – owenduffy.net
  • nanovna-H – Chinese junk? – owenduffy.net
  • nanovna-H – a ferrite cored test inductor – drilling down on a glitch – the fix – owenduffy.net
  • DfuSe – dependency on Visual C++ 2013 runtime – owenduffy.net
  • nanovna-H – a ferrite cored test inductor – drilling down on a glitch – owenduffy.net
  • nanovna-H – standalone VHF antenna VSWR sweep – owenduffy.net
  • nanovna-H – mobile UHF antenna VSWR sweep – owenduffy.net
  • nanovna-H – a ferrite cored test inductor – owenduffy.net
  • nanovna-H – first experience – owenduffy.net
  • nanovna-H – occasional glitches in measured data – owenduffy.net
  • RG6/U with CCS centre conductor at HF – owenduffy.net
  • Series match for a half wave dipole – owenduffy.net
  • Rigexpert AA-600 reference plane – owenduffy.net
  • nanoVNA MOD v3 – a first look – owenduffy.net
  • nanovna – a first plunge – owenduffy.net
  • SimSmith – looking both ways – an LNA design task – owenduffy.net
  • Transmitter / antenna systems and the maximum power transfer theorem – owenduffy.net
  • CNC6040 router project – test cut of a Jiffy box – owenduffy.net
  • Walter Maxwell’s teachings on system wide conjugate matching – a SimSmith example – owenduffy.net
  • Cooking the books on VSWR – Bird43 indication – owenduffy.net
  • Cooking the books on VSWR – owenduffy.net
  • CNC6040 router project – spindle speed linearisation – using new grbl_ESP32 feature – owenduffy.net
  • CNC6040 router project – spindle speed linearisation – owenduffy.net
  • Noise Figure Y factor method calculator updated – owenduffy.net
  • Noise Figure – Effective Noise Bandwidth – owenduffy.net
  • nanovna-saver – a first look – owenduffy.net
  • Is it 290K or 293K? – owenduffy.net
  • Update for NFM software (v1.19.0) – owenduffy.net
  • Antenna analyser – what if the device under test does not have a coax plug on it? – owenduffy.net
  • Maximum acceptable receiver noise figure – derived from ITU-R P.372-13 guidance – owenduffy.net
  • Noise Figure measurement of a converter / transverter – owenduffy.net
  • Optimum receive system noise figure for given ambient noise – Flex 6700 – owenduffy.net
  • Optimum receive system noise figure for given ambient noise – Flex 6600 – owenduffy.net
  • Minimum ambient noise level – ITU-R P.372-13 guidance – owenduffy.net
  • Franklin antenna – how does it work? – owenduffy.net
  • End Fed Half Wave matching transformer – 80-20m – LO1238 variant – owenduffy.net
  • S/N degradation is related to external noise level and receive system internal noise – owenduffy.net
  • End Fed Half Wave matching transformer – 80-20m – 2xFT240-43 variant – owenduffy.net
  • Post post implementation review R134a replaced with HyChill Minus 30 – owenduffy.net
  • IoT – owenduffy.net
  • The fine print – owenduffy.net
  • RFPM2 – current probe – owenduffy.net
  • owenduffy.net – Page 2 – Mostly electronics…
  • owenduffy.net – Page 111 – Mostly electronics…
  • November 2019 – owenduffy.net
  • October 2019 – owenduffy.net
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  • February 2019 – owenduffy.net
  • January 2019 – owenduffy.net
  • December 2018 – owenduffy.net
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  • October 2018 – owenduffy.net
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  • August 2018 – owenduffy.net
  • July 2018 – owenduffy.net
  • June 2018 – owenduffy.net
  • May 2018 – owenduffy.net
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  • February 2018 – owenduffy.net
  • January 2018 – owenduffy.net
  • December 2017 – owenduffy.net
  • November 2017 – owenduffy.net
  • October 2017 – owenduffy.net
  • September 2017 – owenduffy.net
  • August 2017 – owenduffy.net
  • July 2017 – owenduffy.net
  • June 2017 – owenduffy.net
  • May 2017 – owenduffy.net
  • April 2017 – owenduffy.net
  • March 2017 – owenduffy.net
  • February 2017 – owenduffy.net
  • January 2017 – owenduffy.net
  • December 2016 – owenduffy.net
  • November 2016 – owenduffy.net
  • October 2016 – owenduffy.net
  • September 2016 – owenduffy.net
  • August 2016 – owenduffy.net
  • July 2016 – owenduffy.net
  • June 2016 – owenduffy.net
  • May 2016 – owenduffy.net
  • April 2016 – owenduffy.net
  • March 2016 – owenduffy.net
  • February 2016 – owenduffy.net
  • January 2016 – owenduffy.net
  • December 2015 – owenduffy.net
  • November 2015 – owenduffy.net
  • October 2015 – owenduffy.net
  • September 2015 – owenduffy.net
  • August 2015 – owenduffy.net
  • July 2015 – owenduffy.net
  • Online calculator of ferrite material permeability interpolations – more detail – owenduffy.net
  • Holux web site missing / offline, Holux ezTour crippled – owenduffy.net
  • OpenLog for TinyTrak – inline DE9 adapter – owenduffy.net
  • Diagnosing a possible antenna problem by comparison with a baseline – owenduffy.net
  • Refurbishing the push button in action cam cases – owenduffy.net
  • Matching a 5/8λ ground plane – a single stub tuner example – owenduffy.net
  • Trapped dipole – owenduffy.net
  • owenduffy.net – Page 110 – Mostly electronics…
  • Designing with binocular ferrite cores – published Al values – owenduffy.net
  • Designing with binocular ferrite cores – Σ(A/l) – owenduffy.net
  • Do Distortionless Lines exist? – owenduffy.net
  • Comparison of BN43-202 / 5t with BN73-202 / 2t for rx only on low HF – small broadband RF transformer – 50:200Ω – owenduffy.net
  • Transmission lines: departure from ideal Zo – owenduffy.net
  • Basic programming jig for STC15F104E and STC15F204E chips #3 – owenduffy.net
  • XH plug savers on the STC U8W & U8 programmer – owenduffy.net
  • Garden hose couplers – there has to be a better way – owenduffy.net
  • RF transformer design with ferrite cores – saturation calcs – owenduffy.net
  • RF transformer design with ferrite cores – initial steps – owenduffy.net
  • An online expert on the unsuitability of #43 for HF UNUNs – owenduffy.net
  • Speaker tick generator #2 (for polarity testing) – owenduffy.net
  • Fox flasher MkII update 7/2019 – owenduffy.net
  • owenduffy.net – Page 109 – Mostly electronics…
  • Basic programming jig for STC15F104E and STC15F204E chips – owenduffy.net
  • From lossless transmission line to practical – Zo and γ – owenduffy.net
  • SimSmith example of VSWR assessment – owenduffy.net
  • ESP01S IoT – Thingspeak GET submission – owenduffy.net
  • On working with complex Zo – owenduffy.net
  • ESP01S first experience – owenduffy.net
  • On the concept of that P=Pfwd-Prev – owenduffy.net
  • On negative VSWR – Return Loss implications – owenduffy.net
  • On negative VSWR – a worked example – owenduffy.net
  • owenduffy.net – Page 108 – Mostly electronics…
  • On negative VSWR – owenduffy.net
  • Trying to make sense of the STC U8W chip programmer – owenduffy.net
  • Fox flasher MkII – update 07/2019 – owenduffy.net
  • The private and public scope of coaxial cable – owenduffy.net
  • Average power of SSB telephony – experimental verification – owenduffy.net
  • Power rating of a ferrite cored transformer or balun – owenduffy.net
  • Average power of SSB telephony – owenduffy.net
  • Fox flasher MkII – high power 2 LED solar powered beacon – update 6/2019 – owenduffy.net
  • owenduffy.net – Page 107 – Mostly electronics…
  • Fox flasher MkII – high power 2 LED solar powered beacon – update 6/2018 – owenduffy.net
  • High end VSWR compensation in a ferrite cored RF transformer – owenduffy.net
  • Estimating the Insertion VSWR in a ferrite cored RF transformer – owenduffy.net
  • Estimating the magnetising or core loss in a ferrite cored RF transformer – owenduffy.net
  • Derating rectifier diode current – owenduffy.net
  • Using SPICE on antenna baluns – owenduffy.net
  • Guanella’s 1:1 balun and his explanation – Zcm – owenduffy.net
  • Hitachi DB3DL2 UC3SFL repair – owenduffy.net
  • Guanella’s 1:1 balun and his explanation – owenduffy.net
  • Exploiting your antenna analyser #30 – owenduffy.net
  • EFHW exploration – Part 2: practical examples of EFHW – owenduffy.net
  • owenduffy.net – Page 106 – Mostly electronics…
  • EFHW exploration – Part 1: basic EFHW – owenduffy.net
  • Pawsey Balun – what is it good for? – owenduffy.net
  • Pawsey Balun on an asymmetric load – bench load simulation – owenduffy.net
  • Pawsey Balun on an asymmetric load – owenduffy.net
  • Feasibility study – loop in ground for rx only on low HF – small broadband RF transformer using medium µ ferrite core for receiving use – 50:200Ω – owenduffy.net
  • Nagoya NA-771 2m/70cm antenna – owenduffy.net
  • Capacity test of aftermarket NB-6L batteries #2 – owenduffy.net
  • A balun puzzle – discussion – owenduffy.net
  • A balun puzzle – owenduffy.net
  • Capacity test of aftermarket NB-6L batteries – owenduffy.net
  • owenduffy.net – Page 105 – Mostly electronics…
  • Effective noise bandwidth – IC-7300 CW Rx Filter2 – (500Hz sharp) – owenduffy.net
  • Effective noise bandwidth – IC-7300 SSB Rx Filter2 – (2400Hz sharp) – owenduffy.net
  • Fox flasher MkII – owenduffy.net
  • Search Results for “foxflasher” – owenduffy.net
  • DSZH WK-6889 – temperature sensor – owenduffy.net
  • Post implementation review R134a replaced with HyChill Minus 30 – owenduffy.net
  • Geometry factors for some common Fair-rite binocular ferrite cores – owenduffy.net
  • A symmetric compensation stub using coax – owenduffy.net
  • Measuring trap resonant frequency with an antenna analyser – measurement of a real trap – owenduffy.net
  • Measuring trap resonant frequency with an antenna analyser – owenduffy.net
  • owenduffy.net – Page 104 – Mostly electronics…
  • Comparison of R134a and HyChill Minus 30 – owenduffy.net
  • Exploring HyChill Minus 30 – owenduffy.net
  • Inherently balanced ATUs – part 4 – owenduffy.net
  • Broadband providers are not equal – owenduffy.net
  • Inherently balanced ATUs – part 3 – owenduffy.net
  • Inherently balanced ATUs – part 2 – owenduffy.net
  • Inherently balanced ATUs – owenduffy.net
  • Voltage symmetry of practical Ruthroff 4:1 baluns – finding TLT Vout/Vin – owenduffy.net
  • A low Insertion VSWR high Zcm Guanella 1:1 balun for HF – more detail #3 – owenduffy.net
  • A low Insertion VSWR high Zcm Guanella 1:1 balun for HF – more detail #2 – owenduffy.net
  • De-embedding transmission line to allow remote measurement – owenduffy.net
  • Another measurement of a balun’s Insertion VSWR – owenduffy.net
  • An interesting case study of measurement of a balun’s Insertion VSWR – owenduffy.net
  • owenduffy.net – Page 103 – Mostly electronics…
  • Review – Chinese heating / cooling controller ITC-308 – owenduffy.net
  • Search Results for “gcore” – owenduffy.net
  • Choosing a toroidal magnetic core – ID and OD – owenduffy.net
  • W0SJ matching transformer for an EFLW (Laird 28B1540-000) – owenduffy.net
  • Sumo broadband Internet access – owenduffy.net
  • Exetel broadband Internet access – owenduffy.net
  • Online expert on coax loss – owenduffy.net
  • Voltage symmetry of practical Ruthroff 1:1 baluns – owenduffy.net
  • Voltage symmetry of practical Ruthroff 4:1 baluns – owenduffy.net
  • Equivalent circuit of an antenna system – owenduffy.net
  • owenduffy.net – Page 102 – Mostly electronics…
  • AIM 916 produces internally inconsistent results – owenduffy.net
  • VU3SQM directional wattmeter build – #4 – owenduffy.net
  • W5KV’s transmitting loop measurements – DELUXE HG-1 PreciseLOOP 7MHz – owenduffy.net
  • Measuring common mode current with a scope – owenduffy.net
  • Australian amateur population trends 1998 – 2018 – owenduffy.net
  • Radcom Feb 2019 “cable balun” – a deeper look – owenduffy.net
  • VU3SQM directional wattmeter build – #3 – owenduffy.net
  • owenduffy.net – Page 101 – Mostly electronics…
  • Designing a Gamma Match – confirmation of as-built antennas – owenduffy.net
  • Measuring balun common mode impedance – #1 – owenduffy.net
  • Radcom Feb 2019 “cable balun” – owenduffy.net
  • VU3SQM directional wattmeter build – #2 – owenduffy.net
  • KA0KA’s Youtube test of ATU balance – owenduffy.net
  • VU3SQM directional wattmeter build – #1 – owenduffy.net
  • Elecraft CP-1 directional coupler – magnetics review – owenduffy.net
  • The first 21 days of Exetel broadband Internet access – owenduffy.net
  • STC1000 firmware change – owenduffy.net
  • On Thevenin’s theorem – #2 – owenduffy.net
  • On Thevenin’s theorem – owenduffy.net
  • owenduffy.net – Page 100 – Mostly electronics…
  • Counterfeit FTDI – another form – owenduffy.net
  • The first seven days of Exetel broadband Internet access – owenduffy.net
  • ISP adapter for Arduino Pro Mini / Pro Micro – owenduffy.net
  • Yet another change of Internet broadband access – owenduffy.net
  • IoT – exploration of LoRa – part 3 – owenduffy.net
  • IoT – exploration of LoRa – part 2 – owenduffy.net
  • A low Insertion VSWR high Zcm Guanella 1:1 balun for HF – owenduffy.net
  • IoT – exploration of LoRa – part 1 – owenduffy.net
  • RFPM2 – calibration files – owenduffy.net
  • RFPM2 – calibration – owenduffy.net
  • RF Power Meter 2 (RFPM2) – owenduffy.net
  • owenduffy.net – Page 99 – Mostly electronics…
  • Arduino SAMD21 bootloader protection II – owenduffy.net
  • Motorola TAD1000B Folded Coaxial Antenna – discussion – owenduffy.net
  • An explanation of W5DXP’s ‘line extender device’ – owenduffy.net
  • Rigexpert’s Antscope takes a bigger step backwards – owenduffy.net
  • owenduffy.net – Page 98 – Mostly electronics…
  • AIM 915a produces internally inconsistent results – owenduffy.net
  • Dragino LG02 review – owenduffy.net
  • ESP8266 IoT BME280 temperature, humidity and pressure – owenduffy.net
  • IoT – exploration of LoRaWAN – part 1 – owenduffy.net
  • AIM 915 produces internally inconsistent results – owenduffy.net
  • When simple explanations target a simple audience – owenduffy.net
  • Hams helping hams – owenduffy.net
  • Australian amateur radio licensing reform (2018) – owenduffy.net
  • Measuring ambient noise level using a spectrum analyser #2 – owenduffy.net
  • owenduffy.net – Page 97 – Mostly electronics…
  • Online calculator of ferrite material permeability interpolations – additional materials – owenduffy.net
  • Small efficient matching transformer for an EFHW – owenduffy.net
  • Balancing a ceiling fan – owenduffy.net
  • Amateur Radio – Page 68 – owenduffy.net
  • Antenna Tuners (ATU) – Page 5 – owenduffy.net
  • Radio-Kits SWR meter – build and review – owenduffy.net
  • Antennas – Page 40 – owenduffy.net
  • Backtracking in APRS – owenduffy.net
  • Mapping trips from APRS archives – owenduffy.net
  • Zig zags in APRS tracks – owenduffy.net
  • APRS – Page 2 – owenduffy.net
  • APRS – Page 8 – owenduffy.net
  • ?feed=rss2&cat=6
  • Inside the YHDC SCT013 current transformer – owenduffy.net
  • SCT-010-000 current transformer protection – owenduffy.net
  • EmonTx3 v3.4 ‘wired’ implementation – owenduffy.net
  • Arduino 1.6.12 – adding Optiboard boards.txt – owenduffy.net
  • Arduino 1.6.12 & 1.6.13 AVRDUDE issues – owenduffy.net
  • ADS1115 ADC checkout – #1 – owenduffy.net
  • Fan controlled by humidity sensor – pre implementation data gathering – owenduffy.net
  • Fan controlled by humidity sensor – owenduffy.net
  • Time to get some experience with 32bit microcontrollers – some progress – owenduffy.net
  • Time to get some experience with 32bit microcontrollers – owenduffy.net
  • Arduino thermistor thermometer – a tutorial – owenduffy.net
  • Fan controlled by humidity sensor – design technique – owenduffy.net
  • Arduino app to set DS1307 Real Time Clocks. – owenduffy.net
  • Arduino – Page 2 – owenduffy.net
  • Arduino – Page 3 – owenduffy.net
  • ?feed=rss2&cat=15
  • Review of the Amidon AB_200_10 balun – owenduffy.net
  • A low Insertion VSWR high Zcm Guanella 1:1 balun for HF – more detail – owenduffy.net
  • Baluns – Page 2 – owenduffy.net
  • Baluns – Page 7 – owenduffy.net
  • ?feed=rss2&cat=24
  • ESP8266 IoT DHT22 temperature and humidity – evolution 3 – owenduffy.net
  • NodeMCU devkit V1 deep sleep – owenduffy.net
  • ESP8266 remote power display for energy monitor – EV3 – 5V display – owenduffy.net
  • ESP8266 remote power display for energy monitor – EV3 – owenduffy.net
  • ESP8266 remote power display for energy monitor – owenduffy.net
  • ESP8266 remote power display for energy monitor – EV2 – owenduffy.net
  • ESP8266 IoT DHT22 temperature and humidity – evolution 2 – owenduffy.net
  • Computing – Page 2 – owenduffy.net
  • Computing – Page 6 – owenduffy.net
  • ?feed=rss2&cat=26
  • Apples have just come off the trees – owenduffy.net
  • ?feed=rss2&cat=23
  • WBT-4000W 230V AC dimmer / motor speed controller – owenduffy.net
  • A flexible test panel for microcontroller based power control projects – #2 – owenduffy.net
  • A flexible test panel for microcontroller based power control projects – owenduffy.net
  • Electrical – Page 2 – owenduffy.net
  • Electrical – Page 4 – owenduffy.net
  • ?feed=rss2&cat=10
  • Electronics – Page 2 – owenduffy.net
  • Electronics – Page 21 – owenduffy.net
  • ?feed=rss2&cat=7
  • Maker – Page 2 – owenduffy.net
  • Maker – Page 13 – owenduffy.net
  • ?feed=rss2&cat=34
  • Search Results for “RFPM2” – owenduffy.net
  • Search Results for “RFPM1” – owenduffy.net
  • Search Results for “rfpm1” – owenduffy.net
  • Measurement – Page 2 – owenduffy.net
  • Measurement – Page 6 – owenduffy.net
  • ?feed=rss2&cat=28
  • Cheap Chinese wristwatch #2 – owenduffy.net
  • Cheap Chinese wristwatch #1 – owenduffy.net
  • Mandarin & Lime Marmalade – owenduffy.net
  • Australian Lime & Lemon Marmalade – owenduffy.net
  • Tahitian Lime Marmalade – owenduffy.net
  • Australian Lime Marmalade – owenduffy.net
  • The old wheelbarrow will not die – owenduffy.net
  • Leafeater retro fit – owenduffy.net
  • ?feed=rss2&cat=5
  • A little programming adapter for 4 x 2mm pitch pads – owenduffy.net
  • Inductance of sensorless brushless DC motors – owenduffy.net
  • A Demagnetisation Risk Index for a sensorless brushless DC drive – owenduffy.net
  • Standardised processing of instrument screen captures – owenduffy.net
  • Demagnetisation in a sensorless brushless DC drive – owenduffy.net
  • Hobbyking Multistar 4220-650Kv – owenduffy.net
  • Regenerative braking and electronic power supplies – owenduffy.net
  • RCTimer 4215-530Kv BLDC motor checkout – owenduffy.net
  • CC3D F4 fraud – owenduffy.net
  • RC models – Page 2 – owenduffy.net
  • RC models – Page 7 – owenduffy.net
  • ?feed=rss2&cat=12
  • Anytone AT-D868UV: initial impressions – owenduffy.net
  • Calibrating the Elecraft N-GEN – owenduffy.net
  • Calculation of received noise power given ENB and ENR – owenduffy.net
  • Effective noise bandwidth – IC-7300 SSB Rx Filter2 (2400Hz soft) – owenduffy.net
  • IC-7300 S-meter calibration accuracy – owenduffy.net
  • Receivers – Page 2 – owenduffy.net
  • Receivers – Page 5 – owenduffy.net
  • ?feed=rss2&cat=30
  • A cheap and cheerful data logger – owenduffy.net
  • Raspberry Pi 2 initial impressions – owenduffy.net
  • On-air testing of APRS digipeater with a crafted suite of test records – owenduffy.net
  • RPi headless aprx server using soundmodem – owenduffy.net
  • Cron configuration improvements for Raspberry Pi – owenduffy.net
  • Real time clock for Raspberry Pi – owenduffy.net
  • Notes on my fork of aprx – owenduffy.net
  • Headless aprx APRS server – RPi packages – owenduffy.net
  • Headless aprx server trial – owenduffy.net
  • Headless aprx server – trial wrapup – owenduffy.net
  • Towards a reliable APRS iGate – #2 – owenduffy.net
  • Towards a reliable APRS iGate – owenduffy.net
  • RPi – Page 2 – owenduffy.net
  • ?feed=rss2&cat=29
  • Slot.it orange CA20Z build – owenduffy.net
  • Slot.it CS23B build – owenduffy.net
  • Slot.it CA20Z build – owenduffy.net
  • Slot.it CA20A rework – owenduffy.net
  • ?feed=rss2&cat=31
  • AE7PD’s transmitting loop measurements – owenduffy.net
  • Findling & Siwiak 2012 measurements of an Alexloop – discussion – owenduffy.net
  • Findling & Siwiak 2012 measurements of an Alexloop – owenduffy.net
  • G3CWI 2018 measurements of an Alexloop Walkham – owenduffy.net
  • Single turn coaxial loop resonator analysis – owenduffy.net
  • G3CWI’s ground wave tests Jul 2017 using WSPRlite – owenduffy.net
  • STL propaganda indeed: QW vertical – dipole – STL model pattern comparison – owenduffy.net
  • STL propaganda indeed: dipole – STL pattern comparison – owenduffy.net
  • STL propaganda indeed – owenduffy.net
  • Small Transmitting Loops – Page 2 – owenduffy.net
  • Small Transmitting Loops – Page 9 – owenduffy.net
  • ?feed=rss2&cat=4
  • First full month of Amaysim broadband broadband Internet access – owenduffy.net
  • First full week of Amaysim broadband Internet access – owenduffy.net
  • Review of 10 months of iiNet broadband Internet access – owenduffy.net
  • iiNet broadband Internet access – speed observations – owenduffy.net
  • Review of 5 months of iiNet broadband Internet access – owenduffy.net
  • First month of iiNet FTTN broadband Internet access – owenduffy.net
  • Queueing in data networks – owenduffy.net
  • Telecommunications – Page 2 – owenduffy.net
  • ?feed=rss2&cat=2
  • WW1WW’s matching transformer for an EFHW – owenduffy.net
  • PD7MAA’s BN43-202 matching transformer for an EFHW – owenduffy.net
  • AIM 914 produces internally inconsistent results – owenduffy.net
  • Test equipment – Page 2 – owenduffy.net
  • Test equipment – Page 17 – owenduffy.net
  • ?feed=rss2&cat=11
  • Transmission lines – Page 2 – owenduffy.net
  • Transmission lines – Page 26 – owenduffy.net
  • ?feed=rss2&cat=13
  • VSWR meter trap for the unwary – owenduffy.net
  • 40m filter for WSPRlite flex – owenduffy.net
  • Another RFI mod of a speaker mic for DMR use – owenduffy.net
  • Transmitters – Page 2 – owenduffy.net
  • Transmitters – Page 16 – owenduffy.net
  • ?feed=rss2&cat=1
  • RBN for antenna comparisons – Radcom 2018 – owenduffy.net
  • A tutorial on estimating the impedance of a toroidal ferrite cored inductor for radio frequencies – owenduffy.net
  • W3LPL’s paired WSPRlite test – test 2 – owenduffy.net
  • Signed application programs – owenduffy.net
  • AIM 865A Refer to Antenna facility – owenduffy.net
  • Measuring balun common mode impedance – #2 – owenduffy.net
  • AIM 865A produces inconsistent / incorrect results – owenduffy.net
  • AIM 882 produces internally inconsistent results – owenduffy.net
  • Uncategorized – Page 2 – owenduffy.net
  • ic9350 updated to support 3040 – owenduffy.net
  • Roger Beep fitted to MFJ-1263 microphone / rig switch – owenduffy.net
  • Tunemate update – owenduffy.net
  • VK1OD Roger Beep project documentation – owenduffy.net
  • ?feed=rss2&tag=aim-use-issues
  • Accuracy of AIMuhf system – AIM910B vs several recent versions on a ferrite cored inductor – owenduffy.net
  • Accuracy of AIMuhf system – AIM910A vs several recent versions on a ferrite cored inductor – owenduffy.net
  • Characterising an unknown ferrite toroid – owenduffy.net
  • 2.4:1 balun design failure – owenduffy.net
  • A walk through of a practical application of AIMuhf/AIM900A #2 – owenduffy.net
  • A walk through of a practical application of AIMuhf/AIM900 – owenduffy.net
  • AIM use & issues – Page 2 – owenduffy.net
  • AIM use & issues – Page 3 – owenduffy.net
  • ?feed=rss2&tag=designing-high-performance-vhfuhf-receive-systems
  • Designing high performance VHF/UHF receive systems – Part 7 – owenduffy.net
  • Designing high performance VHF/UHF receive systems – Part 6 – owenduffy.net
  • Designing high performance VHF/UHF receive systems – Part 5 – owenduffy.net
  • Designing high performance VHF/UHF receive systems – Part 4 – owenduffy.net
  • Designing high performance VHF/UHF receive systems – Part 3 – owenduffy.net
  • Designing high performance VHF/UHF receive systems – Part 2 – owenduffy.net
  • Designing high performance VHF/UHF receive systems – Part 1 – owenduffy.net
  • ?feed=rss2&tag=exploiting-your-antenna-analyser
  • Exploiting your antenna analyser #29 – owenduffy.net
  • Exploiting your antenna analyser #28 – owenduffy.net
  • Exploiting your antenna analyser #27 – owenduffy.net
  • Exploiting your antenna analyser #26 – owenduffy.net
  • Exploiting your antenna analyser – contents – owenduffy.net
  • Exploiting your antenna analyser #25 – owenduffy.net
  • Exploiting your antenna analyser #24 – owenduffy.net
  • Exploiting your antenna analyser #23 – owenduffy.net
  • Exploiting your antenna analyser #22 – owenduffy.net
  • Exploiting your antenna analyser #21 – owenduffy.net
  • Exploiting your antenna analyser – Page 2 – owenduffy.net
  • Exploiting your antenna analyser – Page 3 – owenduffy.net
  • ?feed=rss2&tag=ic-7410-tests
  • IC-7410 tests – 03 – Noise Figure – owenduffy.net
  • IC-7410 tests – 02 – digital audio output – owenduffy.net
  • IC-7410 tests – 01 – linearity – owenduffy.net
  • ?feed=rss2&tag=noise-figure-meter
  • Using an attenuator for NoiseLo/NoiseHi in NFM – owenduffy.net
  • VK2OMD ambient noise measurement 144MHz – 20140217 – owenduffy.net
  • ?feed=rss2&tag=rfpm1
  • Return Loss sweep using IC7410, RL bridge, and RFPM1 – owenduffy.net
  • A prototype data logger for RFPM1 – owenduffy.net
  • Transmit performance of 2m hand held transceivers – absolute gain estimates – owenduffy.net
  • Transmit performance of 2m hand held transceivers – owenduffy.net
  • Near-field field strength measurements using the RFPM1 – owenduffy.net
  • Review of Boswell et al paper “Performance of a small loop antenna in the 3-10 MHz band” – owenduffy.net
  • VK3AQZ RF power meter (RFPM1) – adjust Tx power example – owenduffy.net
  • VK3AQZ RF power meter (RFPM1) – filter response example – owenduffy.net
  • dB, dBi, and dBd – owenduffy.net
  • On Witt’s calculation of Matched Line Loss from Return Loss – owenduffy.net
  • Review of inexpensive Chinese thermostat – 8010F #2 – owenduffy.net
  • Programming jig for STC15Fx DIP-8, DIP-28 chips – owenduffy.net
  • Flashing LED driver using an ESC – owenduffy.net
  • Review of inexpensive Chinese thermostat – MH-1210 #2 – owenduffy.net
  • Using the AIM to measure matched line loss – owenduffy.net
  • Thermistor for CBAIV – owenduffy.net
  • Baofeng GT-3TP MkIII review – owenduffy.net
  • Antenna span tensioner using a counterweighted halyard – owenduffy.net
  • Antenna span spring tensioner – owenduffy.net
  • June 2015 – Page 2 – owenduffy.net
  • June 2015 – Page 3 – owenduffy.net
  • Dodgy Chinese thermocouple thermometer – owenduffy.net
  • A test run of the generic heating / cooling controller with 10k NTC thermistor sensor – owenduffy.net
  • Thermal observations on Neosid 28-053-31 ferrite toroid – owenduffy.net
  • Interpreting temperature rise in ferrite cored RF transformers and inductors – owenduffy.net
  • Search Results for “ad8307” – owenduffy.net
  • owenduffy.net – Page 3 – Mostly electronics…
  • December 2018 – Page 2 – owenduffy.net
  • November 2018 – Page 2 – owenduffy.net
  • Matched Line Loss of generic RG6/U Quad Shield CCS – owenduffy.net
  • KN5L measurement of JSC 1318 windowed ladder line – MLL @ 4.2MHz – owenduffy.net
  • Transmission line measurements – learning from failure – owenduffy.net
  • Inferring Matched Line Loss from Half Return Loss measurements – Zo error – owenduffy.net
  • Feasibility study – loop in ground for rx only on low HF – small broadband RF transformer – discussion of ferrite material choice – owenduffy.net
  • Feasibility study – loop in ground for rx only on low HF – SDR for measurement? – owenduffy.net
  • August 2018 – Page 2 – owenduffy.net
  • Implementation of G5RV inverted V using high strength aluminium MIG wire – 12 month review – owenduffy.net
  • Pulsar V233-0060 stripped down – owenduffy.net
  • WSPR for A/B tests – a discussion – part 4 – owenduffy.net
  • WSPR for A/B tests – a discussion – part 3 – owenduffy.net
  • Initial review of Owon virtual (USB) oscilloscopes – owenduffy.net
  • WSPR for A/B tests – a discussion – part 2 – owenduffy.net
  • Adjusting modulation level on FM mobiles etc. – owenduffy.net
  • Agat Russian mechanical stopwatch fix – owenduffy.net
  • WSPR for A/B tests – a discussion – part 1 – owenduffy.net
  • March 2018 – Page 2 – owenduffy.net
  • January 2018 – Page 2 – owenduffy.net
  • Chinese no-name 1-500MHz Return Loss Bridge – owenduffy.net
  • Comparing toroidal inductors of different core dimensions – owenduffy.net
  • Molasses derusting of steel – owenduffy.net
  • Review of inexpensive Chinese thermostat – MH1230A – owenduffy.net
  • On winding configuration of EFHW matching transformers – owenduffy.net
  • The sign of reactance – challenge reality check – owenduffy.net
  • The sign of reactance – a challenge – owenduffy.net
  • The sign of reactance – challenge solution – owenduffy.net
  • The sign of reactance – challenge discussion – owenduffy.net
  • Ellington 3 x FT240-52 matching transformer for an EFHW – owenduffy.net
  • Tuned Plate Tuned Grid oscillator – a simple, but complete explanation – owenduffy.net
  • What is a Ground Plane Antenna? – owenduffy.net
  • G3LNP balun with symmetric ‘matched’ load – owenduffy.net
  • G3LNP balun – owenduffy.net
  • Fixes #1: magnetic stirrer with heating plate and digital display XB 85-2 – owenduffy.net
  • Review: magnetic stirrer with heating plate and digital display XB 85-2 – owenduffy.net
  • October 2017 – Page 2 – owenduffy.net
  • A low cost 50Ω termination for measurement purposes – owenduffy.net
  • DL4YHF 50MHz counter on a Chinese TB-244746 PCB – owenduffy.net
  • “No short antenna is more efficient than a resonant-length antenna” – owenduffy.net
  • Small untuned loop with MMIC LNA on 80m – owenduffy.net
  • Failure to treat impedance as a complex quantity leads to… – owenduffy.net
  • Demonstration of the GR1606B for antenna Z measurement and calcs – owenduffy.net
  • 4-20mA Pt100 input for the generic heating / cooling controller – owenduffy.net
  • September 2017 – Page 2 – owenduffy.net
  • GPS antenna plot – owenduffy.net
  • August 2017 – Page 2 – owenduffy.net
  • Chinese batteries – 5 x 2/3A 1.6Ah NiMH cells – owenduffy.net
  • Chinese BN-V11U NiMH replacement battery – owenduffy.net
  • Review of Hantek DSO8102E hand held oscilloscope – owenduffy.net
  • Implementation of G5RV inverted V using high strength aluminium MIG wire – impedance measurements – owenduffy.net
  • July 2017 – Page 2 – owenduffy.net
  • Extrapolating VSWR of a simple series resonant antenna – owenduffy.net
  • Typical zinc thickness on zinc coated products used for antennas – owenduffy.net
  • 80m half wave dipole made from galvanised fence wire – owenduffy.net
  • Finding the inductance of the outside of LDF4-50A – owenduffy.net
  • Loss components in an NEC model of a Small Transmitting Loop – owenduffy.net
  • Measuring SSB telephony Peak Envelope Power – owenduffy.net
  • Exploiting waveguide mode of the loop conductor in a small transmitting loop – owenduffy.net
  • June 2017 – Page 2 – owenduffy.net
  • A search for some mid power white wide angle LEDs – owenduffy.net
  • Shunt matching a loaded HF whip – discussion – owenduffy.net
  • Shunt matching a loaded HF whip with just a VSWR meter – owenduffy.net
  • Power in a mismatched transmission line – owenduffy.net
  • G4JNT’s observation of bandwidth effects on WSPR SNR – owenduffy.net
  • Small untuned loop for receiving – NEC model – owenduffy.net
  • W3LPL’s paired WSPRlite test – test 1 – owenduffy.net
  • May 2017 – Page 2 – owenduffy.net
  • The Mobius strip loop – ham benefits – owenduffy.net
  • The fraud of energy efficient lighting – LED lighting – owenduffy.net
  • Quiet HF antennas and E and H fields in the near field zone – owenduffy.net
  • LNR Precision small transmitting loop – owenduffy.net
  • Current and voltage implications of a small transmitting loop power ratings – owenduffy.net
  • CHA P-Loop 2.0 small transmitting loop – owenduffy.net
  • April 2017 – Page 2 – owenduffy.net
  • Review of Dodd’s WSPR based antenna comparison – owenduffy.net
  • Loss of ladder line: copper vs CCS (DXE-LL300-1C) – owenduffy.net
  • Loss in open wire + coax hybrid feed arrangements – owenduffy.net
  • Loss of windowed ladder line at MF/HF/VHF – owenduffy.net
  • March 2017 – Page 2 – owenduffy.net
  • Modifications for Jasic 200A TIG welder and pedal – owenduffy.net
  • NH7RO 7-foot diameter QRO STL for 40M – owenduffy.net
  • Check / calibrate frequency accuracy of IC-7300 – owenduffy.net
  • Does common mode current flow inside coax? – owenduffy.net
  • PD7MAA’s BN43-202 matching transformer for an EFHW – full measurement set – owenduffy.net
  • Thoughts on binocular ferrite core inductors at radio frequencies – owenduffy.net
  • Common failings of EFHW matching transformers – owenduffy.net
  • PD7MAA’s BN43-202 matching transformer for an EFHW – measurement of a prototype – owenduffy.net
  • Earth electrodes in parallel – owenduffy.net
  • January 2017 – Page 2 – owenduffy.net
  • Tytera MD-390 DMR portable evaluation – owenduffy.net
  • Improving quadcopter stability at very low throttle using Complementary PWM – owenduffy.net
  • Max thrust: Hobbywing XRotor 40A (MkII) vs BLHeli Hobbywing XRotor 40A (MkII) vs SimonK Hobbyking 9261000003 40A – owenduffy.net
  • AU ordinary power plug, plug packs and extension cord sockets – owenduffy.net
  • BLHeli Hobbywing XRotor 40A (MkII) vs SimonK Hobbyking 9261000003 40A – owenduffy.net
  • BLHeli 14.8 damped light and active freewheeling – owenduffy.net
  • Hobbywing XRotor 40A (MkII) – owenduffy.net
  • December 2016 – Page 2 – owenduffy.net
  • Grebenkember’s original Tandem match – owenduffy.net
  • KitsAndParts.com QRP SWR bridge – owenduffy.net
  • DMR distance limit – owenduffy.net
  • TV upgrade – MER optimisation – owenduffy.net
  • TV upgrade – owenduffy.net
  • Coil32 inductance calculator – owenduffy.net
  • Some thinking on ground wave as we enter another solar minimum – owenduffy.net
  • Polarisation of man made noise – an 80m case – owenduffy.net
  • Polarisation of man made noise – owenduffy.net
  • Backup for NBN VDSL access – owenduffy.net
  • Small signal diode characteristics – owenduffy.net
  • Android and local IPv4 DNS name resolution – owenduffy.net
  • October 2016 – Page 2 – owenduffy.net
  • October 2016 – Page 3 – owenduffy.net
  • Cheap Chinese compression connector tool – owenduffy.net
  • Zo of two wire line – owenduffy.net
  • The sign of Return Loss – owenduffy.net
  • Is the premises main earthing conductor ok as a lightning down conductor – owenduffy.net
  • Rationale for sizing of lightning down conductor – owenduffy.net
  • Rigexpert Antscope v4.2.83 released – owenduffy.net
  • September 2016 – Page 2 – owenduffy.net
  • September 2016 – Page 3 – owenduffy.net
  • Tuning combiner lines – owenduffy.net
  • Treatment of the -ve DC return path for transceivers in mobile installations – owenduffy.net
  • Antenna analysers – the basics – QST Aug 2016 – owenduffy.net
  • August 2016 – Page 2 – owenduffy.net
  • Another chapter in the NBN debacle – Jul 2016 – owenduffy.net
  • InsertionVSWR of Red Dot 2016A – owenduffy.net
  • InsertionVSWR of Grebenkemper’s Tandem Match – owenduffy.net
  • InsertionVSWR of Revex W560 on HF – owenduffy.net
  • KG-UV920P repair / modification for driver FET failure – owenduffy.net
  • Search Results for “IC2200H cooling” – owenduffy.net
  • July 2016 – Page 2 – owenduffy.net
  • July 2016 – Page 3 – owenduffy.net
  • Atten APS3005S – a better thermostatic fan control – owenduffy.net
  • Silver vs alkaline button cells – owenduffy.net
  • Micro SD card premature failure – owenduffy.net
  • Chinese counterfeiters at it again – EZP2013 – owenduffy.net
  • Some automation to supplement Cleanflight-configurator – owenduffy.net
  • June 2016 – Page 2 – owenduffy.net
  • On copper loss in transmitting baluns – owenduffy.net
  • MultiStar 5200mAh 3S Lipo – initial tests – owenduffy.net
  • Exploiting your antenna analyser #20 – owenduffy.net
  • Exploiting your antenna analyser #8 – owenduffy.net
  • Analysis of a certain dipole animation – OCF implications – owenduffy.net
  • Analysis of a certain dipole animation – owenduffy.net
  • Exploiting your antenna analyser #19 – owenduffy.net
  • Voltage withstand of Vero strip board – owenduffy.net
  • May 2016 – Page 2 – owenduffy.net
  • On use of enamelled wire in transmitting baluns – owenduffy.net
  • Exploiting your antenna analyser #15 – owenduffy.net
  • Assessing the Q of a half wave dipole antenna system – a real world example – owenduffy.net
  • Assessing the Q of a half wave dipole antenna system – owenduffy.net
  • Field strength survey of an M40-1 short helical vertical on 40m – owenduffy.net
  • USB-A to DC 5.5/2.1mm power cable – current carrying capacity – owenduffy.net
  • PIK – owenduffy.net
  • Counterfeit FTDI – owenduffy.net
  • Exploiting your antenna analyser #10 – owenduffy.net
  • Exploiting your antenna analyser #9 – owenduffy.net
  • Graphic demonstration of loss under standing waves #2 – owenduffy.net
  • December 2015 – Page 2 – owenduffy.net
  • December 2015 – Page 3 – owenduffy.net
  • Belrose field strength measurements of his 80m mobile whip – owenduffy.net
  • On ignoring capacitor losses in Small Transmitting Loops – owenduffy.net
  • NEC study of Small Transmitting Loop Q vs frequency – owenduffy.net
  • K4PP’s 1m Small Transmitting Loop – owenduffy.net
  • November 2015 – Page 2 – owenduffy.net
  • OpenLog for TinyTrak – drive test – owenduffy.net
  • Steel wire CF dipole on 160m – owenduffy.net
  • October 2015 – Page 2 – owenduffy.net
  • Differential flux leakage in a Guanella 1:1 balun – owenduffy.net
  • DYS SN20A out of the box – owenduffy.net
  • Review of G3LDO STL (Radcom Sep 2010) – owenduffy.net
  • September 2015 – Page 2 – owenduffy.net
  • APRS trial Bowral – Wilton – Wollongong – Macquarie Pass – Bowral – owenduffy.net
  • August 2015 – Page 2 – owenduffy.net
  • Solar power supply for foxflasher2 – owenduffy.net
  • Arduino HMC5883 magnetometer – a tutorial – owenduffy.net
  • Arduino stepper motor – a tutorial – owenduffy.net
  • An interesting case study – in service evaluation of coax loss – owenduffy.net
  • July 2015 – Page 2 – owenduffy.net
  • Amateur Radio – Page 67 – owenduffy.net
  • APRS – Page 3 – owenduffy.net
  • APRS – Page 7 – owenduffy.net
  • BG7TBL noise source – owenduffy.net
  • Baluns – Page 3 – owenduffy.net
  • Baluns – Page 6 – owenduffy.net
  • Inductance of a loop of CAT5 pair – owenduffy.net
  • Computing – Page 3 – owenduffy.net
  • Computing – Page 5 – owenduffy.net
  • Electrical – Page 3 – owenduffy.net
  • Electronics – Page 3 – owenduffy.net
  • Maker – Page 3 – owenduffy.net
  • Maker – Page 12 – owenduffy.net
  • ?s=RFPM2&feed=rss2
  • ?s=RFPM1&feed=rss2
  • Search Results for “RFPM1” – Page 2 – owenduffy.net
  • ?s=rfpm1&feed=rss2
  • Search Results for “rfpm1” – Page 2 – owenduffy.net
  • Measurement – Page 3 – owenduffy.net
  • Measurement – Page 5 – owenduffy.net
  • RC models – Page 3 – owenduffy.net
  • RC models – Page 6 – owenduffy.net
  • Receivers – Page 3 – owenduffy.net
  • A check load for antenna analysers with UHF series socket – owenduffy.net
  • Small Transmitting Loops – Page 3 – owenduffy.net
  • Small Transmitting Loops – Page 8 – owenduffy.net
  • Online calculator of ferrite material permeability interpolations – owenduffy.net
  • Another small broadband RF transformer using medium µ ferrite core for receiving use – 50:450Ω – owenduffy.net
  • Another small broadband RF transformer using medium µ ferrite core for receiving use – 50:3200Ω – owenduffy.net
  • Test equipment – Page 3 – owenduffy.net
  • Test equipment – Page 16 – owenduffy.net
  • Transmission lines – Page 3 – owenduffy.net
  • Transmission lines – Page 25 – owenduffy.net
  • Feasibility study – loop in ground for rx only on low HF – owenduffy.net
  • Transmitters – Page 3 – owenduffy.net
  • Transmitters – Page 15 – owenduffy.net
  • ?s=ad8307&feed=rss2
  • Search Results for “ad8307” – Page 2 – owenduffy.net
  • owenduffy.net – Page 4 – Mostly electronics…
  • Feasibility study – loop in ground for rx only on low HF – trial topology selection – owenduffy.net
  • Portune’s magic windowed ladder line – owenduffy.net
  • APRS – Page 4 – owenduffy.net
  • APRS – Page 6 – owenduffy.net
  • Baluns – Page 4 – owenduffy.net
  • Baluns – Page 5 – owenduffy.net
  • Computing – Page 4 – owenduffy.net
  • Electronics – Page 4 – owenduffy.net
  • Maker – Page 4 – owenduffy.net
  • Maker – Page 11 – owenduffy.net
  • Measurement – Page 4 – owenduffy.net
  • RC models – Page 4 – owenduffy.net
  • RC models – Page 5 – owenduffy.net
  • Small Transmitting Loops – Page 4 – owenduffy.net
  • Small Transmitting Loops – Page 7 – owenduffy.net
  • Test equipment – Page 4 – owenduffy.net
  • Test equipment – Page 15 – owenduffy.net
  • Transmission lines – Page 4 – owenduffy.net
  • Transmission lines – Page 24 – owenduffy.net
  • Transmitters – Page 4 – owenduffy.net
  • Transmitters – Page 14 – owenduffy.net
  • owenduffy.net – Page 5 – Mostly electronics…
  • APRS – Page 5 – owenduffy.net
  • Electronics – Page 5 – owenduffy.net
  • Maker – Page 5 – owenduffy.net
  • Maker – Page 10 – owenduffy.net
  • Small Transmitting Loops – Page 5 – owenduffy.net
  • Small Transmitting Loops – Page 6 – owenduffy.net
  • Test equipment – Page 5 – owenduffy.net
  • Test equipment – Page 14 – owenduffy.net
  • Transmission lines – Page 5 – owenduffy.net
  • Transmission lines – Page 23 – owenduffy.net
  • Transmitters – Page 5 – owenduffy.net
  • Transmitters – Page 13 – owenduffy.net
  • owenduffy.net – Page 6 – Mostly electronics…
  • Electronics – Page 6 – owenduffy.net
  • Maker – Page 6 – owenduffy.net
  • Maker – Page 9 – owenduffy.net
  • Test equipment – Page 6 – owenduffy.net
  • Test equipment – Page 13 – owenduffy.net
  • Transmission lines – Page 6 – owenduffy.net
  • Transmission lines – Page 22 – owenduffy.net
  • Transmitters – Page 6 – owenduffy.net
  • Transmitters – Page 12 – owenduffy.net
  • owenduffy.net – Page 7 – Mostly electronics…
  • Electronics – Page 7 – owenduffy.net
  • Maker – Page 7 – owenduffy.net
  • Maker – Page 8 – owenduffy.net
  • Test equipment – Page 7 – owenduffy.net
  • Test equipment – Page 12 – owenduffy.net
  • Transmission lines – Page 7 – owenduffy.net
  • Transmission lines – Page 21 – owenduffy.net
  • Transmitters – Page 7 – owenduffy.net
  • Transmitters – Page 11 – owenduffy.net
  • owenduffy.net – Page 8 – Mostly electronics…
  • Electronics – Page 8 – owenduffy.net
  • Test equipment – Page 8 – owenduffy.net
  • Test equipment – Page 11 – owenduffy.net
  • Transmission lines – Page 8 – owenduffy.net
  • Transmission lines – Page 20 – owenduffy.net
  • Transmitters – Page 8 – owenduffy.net
  • Transmitters – Page 10 – owenduffy.net
  • owenduffy.net – Page 9 – Mostly electronics…
  • Electronics – Page 9 – owenduffy.net
  • Test equipment – Page 9 – owenduffy.net
  • Test equipment – Page 10 – owenduffy.net
  • Transmission lines – Page 9 – owenduffy.net
  • Transmission lines – Page 19 – owenduffy.net
  • Transmitters – Page 9 – owenduffy.net
  • owenduffy.net – Page 10 – Mostly electronics…
  • Electronics – Page 10 – owenduffy.net
  • Transmission lines – Page 10 – owenduffy.net
  • Transmission lines – Page 18 – owenduffy.net
  • owenduffy.net – Page 11 – Mostly electronics…
  • Electronics – Page 11 – owenduffy.net
  • Transmission lines – Page 11 – owenduffy.net
  • Transmission lines – Page 17 – owenduffy.net
  • owenduffy.net – Page 12 – Mostly electronics…
  • Electronics – Page 12 – owenduffy.net
  • Transmission lines – Page 12 – owenduffy.net
  • Transmission lines – Page 16 – owenduffy.net
  • owenduffy.net – Page 13 – Mostly electronics…
  • Electronics – Page 13 – owenduffy.net
  • Transmission lines – Page 13 – owenduffy.net
  • Transmission lines – Page 15 – owenduffy.net
  • owenduffy.net – Page 14 – Mostly electronics…
  • Electronics – Page 14 – owenduffy.net
  • Transmission lines – Page 14 – owenduffy.net
  • owenduffy.net – Page 15 – Mostly electronics…
  • Electronics – Page 15 – owenduffy.net
  • owenduffy.net – Page 16 – Mostly electronics…
  • Electronics – Page 16 – owenduffy.net
  • owenduffy.net – Page 17 – Mostly electronics…
  • Electronics – Page 17 – owenduffy.net
  • owenduffy.net – Page 18 – Mostly electronics…
  • Electronics – Page 18 – owenduffy.net
  • owenduffy.net – Page 19 – Mostly electronics…
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  • owenduffy.net – Page 85 – Mostly electronics…
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  • owenduffy.net – Page 87 – Mostly electronics…
  • owenduffy.net – Page 88 – Mostly electronics…
  • owenduffy.net – Page 89 – Mostly electronics…
  • owenduffy.net – Page 90 – Mostly electronics…
  • owenduffy.net – Page 91 – Mostly electronics…
  • owenduffy.net – Page 92 – Mostly electronics…
  • owenduffy.net – Page 93 – Mostly electronics…
  • Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3540-14 brushless drive #2 – owenduffy.net
  • Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3540-14 brushless drive – owenduffy.net
  • A test run of the generic heating / cooling controller with Pt100 sensor – owenduffy.net
  • SPI input for the generic heating / cooling controller – owenduffy.net
  • Adafruit MAX31855 checkout – owenduffy.net
  • May 2015 – Page 2 – owenduffy.net
  • Using a Pt100 RTD with my generic heating / cooling controller – owenduffy.net
  • N2006P PID checkout #1 – owenduffy.net
  • AIM 885A produces internally inconsistent results – owenduffy.net
  • AIM 885 produces internally inconsistent results – owenduffy.net
  • AIM 882 produces internally inconsistent results – more tests – owenduffy.net
  • Accuracy of AIMuhf system – AIM865A vs AIM882 vs AIM885 on a ferrite cored inductor – owenduffy.net
  • Accuracy of AIMuhf system – AIM865A vs AIM882 on a ferrite cored inductor – owenduffy.net
  • AIM885 Refer To Antenna checkout – owenduffy.net
  • Speaker wire is so popular as an RF transmission line – owenduffy.net
  • Hobbyking Swamp Dawg build – #1 – owenduffy.net
  • SimonK on Hobbyking 40A ESC 4A UBEC 9261000003 – owenduffy.net
  • BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #3 – owenduffy.net
  • March 2015 – Page 2 – owenduffy.net
  • LP-100A manual advice on VSWR measurement – owenduffy.net
  • Where is the best place to measure feed point VSWR – owenduffy.net
  • Attempting to reconcile W5DXP & G3TXQ’s comparison of K and 52 mix ferrites #2 – owenduffy.net
  • Attempting to reconcile W5DXP & G3TXQ’s comparison of K and 52 mix ferrites – owenduffy.net
  • Sevick’s comments on selection of ferrite mix – owenduffy.net
  • Baluns – Rule 500 – owenduffy.net
  • Jaycar MP3090 / Manson SPS-9400 repair – owenduffy.net
  • Ferrite K mix – owenduffy.net
  • RS485 termination / bias adapter – owenduffy.net
  • February 2015 – Page 2 – owenduffy.net
  • The laws of physics – common mode currents and coax – owenduffy.net
  • Loss of Wireman 553 windowed ladder line at MF/HF – does it matter #2 – owenduffy.net
  • Diamond X-50N #2 at VK2OMD – owenduffy.net
  • Loss of Wireman 553 windowed ladder line at MF/HF – does it matter – owenduffy.net
  • USB – RS232/TTL/485 adapter – owenduffy.net
  • January 2015 – Page 2 – owenduffy.net
  • January 2015 – Page 3 – owenduffy.net
  • ashim at shell servo – owenduffy.net
  • QRP2000 synthesiser build – owenduffy.net
  • Solder cream has a use-by date – owenduffy.net
  • Near-field field strength measurements using a diode detector – owenduffy.net
  • Analysis of a series of NEC-4 models of a low loss small transmitting loop at 7MHz at varying height – owenduffy.net
  • Do gamma matches necessarily degrade bandwidth – owenduffy.net
  • The Army Loop (Patterson match) – owenduffy.net
  • December 2014 – Page 2 – owenduffy.net
  • The KISS TNC – too simple, too stupid? – owenduffy.net
  • Chameleon CHA M-LOOP – owenduffy.net
  • FTDIgate and revokation of my previous unqualified recommendation for FTDI – owenduffy.net
  • When governments tinker in telecommunications carriage… – owenduffy.net
  • APRS test drive – 20141114 – owenduffy.net
  • November 2014 – Page 2 – owenduffy.net
  • November 2014 – Page 3 – owenduffy.net
  • Exploring VK2XSO’s transmission line example – owenduffy.net
  • Feed line length affect on VSWR – owenduffy.net
  • Galvanised steel wire CF dipole – owenduffy.net
  • Galvanised steel wire OCF dipole – owenduffy.net
  • OpenTracker USB review – owenduffy.net
  • aprx: evalution of viscous digi – owenduffy.net
  • October 2014 – Page 2 – owenduffy.net
  • APRS test drive – 20140930 – owenduffy.net
  • Synthetic fibre rope for antenna rigging – owenduffy.net
  • End fed wires – another matching case study – owenduffy.net
  • End fed wires – new hams love ’em – owenduffy.net
  • Garmin GPS35 DE-9 (F) wiring – owenduffy.net
  • Effect of ground on HF horizontal dipole efficiency – owenduffy.net
  • MFJ-1270B TNC alignment – owenduffy.net
  • Signalink USB PTT disable – owenduffy.net
  • Signalink USB noise floor improvement – owenduffy.net
  • September 2014 – Page 2 – owenduffy.net
  • September 2014 – Page 3 – owenduffy.net
  • The fraud of energy efficient lighting – e-ballasts – owenduffy.net
  • BLHeli v12.0 review – owenduffy.net
  • TNC-X – DCD behaviour – owenduffy.net
  • Headless javAPRSSrvr – trial wrap up – owenduffy.net
  • Headless javAPRSSrvr – owenduffy.net
  • Latency in APRS networks – owenduffy.net
  • Should you use MIC-E compression in your APRS tracker – owenduffy.net
  • Open squelch data carrier detect for Flash Packet Radio Control Board (VK6) – owenduffy.net
  • MFJ-1270B TNC review – owenduffy.net
  • The extent to which APRS works is often an accident – owenduffy.net
  • August 2014 – Page 2 – owenduffy.net
  • August 2014 – Page 3 – owenduffy.net
  • Adjusting AFSK FM tx level using a PC oscilloscope – owenduffy.net
  • AX.25 1200Bd AFSK FM – to pre-emphasise or not – owenduffy.net
  • Diagnosis of APRS reception problem – owenduffy.net
  • APRS call sign corruption at iGate – owenduffy.net
  • Audio level setup on TNC-X (MFJ-1270X) – owenduffy.net
  • Are you getting the best performance from your FM AFSK APRS transmitter – owenduffy.net
  • TNC-X build – owenduffy.net
  • Foxtrak build – owenduffy.net
  • Review of APRSTRACKER v0.11firmware – owenduffy.net
  • Turnigy Micro Tach – battery issues – owenduffy.net
  • July 2014 – Page 2 – owenduffy.net
  • A quadcopter tuning story – symmetry is important – owenduffy.net
  • Spoiling balun action with ‘shielded twin’ – owenduffy.net
  • VK3FI QRSS on 473kHz – 19/06/2014 – owenduffy.net
  • Simple Morse beacon keyer for VK3FI on 600m – owenduffy.net
  • Thermograph of small transmitting loop – owenduffy.net
  • Double Bazooka magic – owenduffy.net
  • Fan frustrations – owenduffy.net
  • June 2014 – Page 2 – owenduffy.net
  • Small transmitting loop calculators – a comparison – owenduffy.net
  • May 2014 – Page 2 – owenduffy.net
  • April 2014 – Page 2 – owenduffy.net
  • Feed point voltage – W5WSS 7′ dipole – owenduffy.net
  • Feed point voltage – full wave dipole – owenduffy.net
  • Bushnell Back Track D-TOUR – owenduffy.net
  • March 2014 – Page 2 – owenduffy.net
  • February 2014 – Page 2 – owenduffy.net
  • February 2014 – Page 4 – owenduffy.net
  • January 2014 – Page 2 – owenduffy.net
  • Yet another dodgy coax collinear – owenduffy.net
  • December 2013 – Page 2 – owenduffy.net
  • owenduffy.net – Page 94 – Mostly electronics…
  • owenduffy.net – Page 96 – Mostly electronics…
  • Workup of G5RV inverted V using high strength aluminium MIG wire – owenduffy.net
  • A model of current distribution in copper clad steel conductors at RF – owenduffy.net
  • Skin depth in copper at 1.8MHz according to QRZ – owenduffy.net
  • Small untuned loop for receiving – is an amplifier necessary? – owenduffy.net
  • BN43-2402 balun example – owenduffy.net
  • MFJ-993B internal balun review – owenduffy.net
  • Demonstration video of Cadweld Oneshot Plus ground rod connection – owenduffy.net
  • A certain formula for antenna system Q – owenduffy.net
  • Effect of ground on HF horizontal dipole efficiency – more detail – owenduffy.net
  • A tale of two USB-RS232 adapters – owenduffy.net
  • A drive test of RTKLIB accurate GPS – owenduffy.net
  • Transformerless power supply for PAROT – owenduffy.net
  • Amateur Radio – Page 66 – owenduffy.net
  • Proposed 60m amateur band power limit – owenduffy.net
  • AUT – MobileOne M40-1 40m helical – owenduffy.net
  • Are copper clad VHF whips a marketing ploy – owenduffy.net

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