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owenduffy.net index
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Digital document signatures
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Disclaimer
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- blog/1,885 pages
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owenduffy.net – Mostly electronics…
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?feed=rss2
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?feed=comments-rss2
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Quiet solar radio flux interpolations calculator – owenduffy.net
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April 2016 – Page 2 – owenduffy.net
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CH340, CH341 USB to RS-232 chip compatibility – owenduffy.net
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Some thoughts on a two turn small transmitting loop – owenduffy.net
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Accuracy of estimation of radiation resistance of small transmitting loops – owenduffy.net
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Ultrafire XML-T6 LED torch – a fix for the dysfunctional mode memory ‘feature’ – owenduffy.net
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End fed Zepp – owenduffy.net
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Fridge / freezer setup – owenduffy.net
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A tutorial on initial design of operating conditions for a valve amplifier – owenduffy.net
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Thinking about SOTA, EFHW and EMR safety – owenduffy.net
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SPICE model of Zcm of a Guanella 9:1 current balun – owenduffy.net
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Why the preference for Guanella 1:1 current baluns for HF wire antennas – owenduffy.net
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Ultrafire XML-T6 torch review – owenduffy.net
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March 2016 – Page 2 – owenduffy.net
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ATU efficiency – owenduffy.net
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RG-6/U for lower HF – owenduffy.net
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Elitech RC-4 logging thermometer – owenduffy.net
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KL7AJ quick quiz 21/02/2016 – owenduffy.net
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Measuring common mode choke Zcm using a two port VNA – owenduffy.net
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Review of N6PAA’s 40m STL – owenduffy.net
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Review of KK5JY’s 40m STL – owenduffy.net
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Design / build project: Guanella 1:1 ‘tuner balun’ for HF – #1 – owenduffy.net
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Design / build project: Guanella 1:1 ‘tuner balun’ for HF – #2 – owenduffy.net
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Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #3 – owenduffy.net
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Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #5 – owenduffy.net
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Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #6 – owenduffy.net
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Low power Guanella 1:1 tuner balun using a pair of Jaycar LF1260 suppression sleeves – owenduffy.net
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February 2016 – Page 2 – owenduffy.net
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February 2016 – Page 3 – owenduffy.net
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Low noise Yagis and 50MHz noise – owenduffy.net
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Some thoughts on noise on 6m (50MHz)… – owenduffy.net
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A low cost home made USB CI-V interface with open collector and solid Windows drivers – owenduffy.net
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Voltage and current on a transmission line with standing waves – owenduffy.net
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Feeding at a current maximum – owenduffy.net
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Graphic demonstration of loss under standing waves #3 – owenduffy.net
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Graphic demonstration of loss under standing waves – owenduffy.net
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VSWR expressed as 1:n – owenduffy.net
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Expression of VSWR as a simple decimal real number – owenduffy.net
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January 2016 – Page 2 – owenduffy.net
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January 2016 – Page 3 – owenduffy.net
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xmlrpc.php?rsd
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SSL migration of owenduffy.net web site – owenduffy.net
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80m voltage fed Half Square matching workup – owenduffy.net
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Checkout of SimSmith v16.3 – spot check of transmission line database – further discussion – owenduffy.net
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FT82-43 matching transformer for an EFHW – owenduffy.net
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Ham grade analysers and VNAs often use unconventional meanings for well known terms – owenduffy.net
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Checkout of SimSmith v16.3 – spot check of transmission line database – owenduffy.net
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Inexpensive 4-20mA source – review – owenduffy.net
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Measuring ambient noise level using a spectrum analyser – owenduffy.net
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IoT water tank telemetry project – part 4 – owenduffy.net
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Is |s21| measurement of a common mode choke meaningful to antenna systems? – owenduffy.net
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XL6009 DC-DC converter chip issue – owenduffy.net
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Effect of shorting turns on a tapped air cored solenoid at RF #2 – owenduffy.net
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Finding velocity factor of coaxial transmission line using the velocity factor solver – owenduffy.net
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Finding velocity factor of coaxial transmission line – a challenge – owenduffy.net
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IoT water tank telemetry project – part 3 – owenduffy.net
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4NEC2 plots of STL VSWR III – owenduffy.net
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4NEC2 plots of STL VSWR II – owenduffy.net
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Riding the RF Gain control – part 5 – owenduffy.net
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Discussion of WA7ARK’s contribution to a QRZ thread on an End Fed Dipole – owenduffy.net
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Wooly thinking on the nature of feed line common mode current – owenduffy.net
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Hobbyking 2500mAh 18650 LiIon cells (9210000181-0) initial capacity test – owenduffy.net
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IoT water tank telemetry project – part 2 – owenduffy.net
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Aluminium ground system suitability for ham radio station – owenduffy.net
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Baluns – wire size insanity – owenduffy.net
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IoT water tank telemetry project – part 1 – owenduffy.net
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ARRL guidance on design of ferrite cored inductors – owenduffy.net
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Antenna half power bandwidth and Q, concept and experimental validation – owenduffy.net
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AIM system – AIM912 initial checkout – owenduffy.net
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Review of inexpensive Chinese LAN cable tester – owenduffy.net
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Speaker tick generator (for polarity testing) – owenduffy.net
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IMD associated with colorbond sheet steel cladding – owenduffy.net
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Baselining an antenna system with an analyser – owenduffy.net
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Thompson’s coax common mode explanation – owenduffy.net
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An RF choke for a 1.8-30MHz coax power injector – LF1260 core – owenduffy.net
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Riding the RF Gain control – part 4 – owenduffy.net
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Riding the RF Gain control – part 3 – owenduffy.net
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Riding the RF Gain control – part 2 – owenduffy.net
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Riding the RF Gain control – part 1 – owenduffy.net
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Common mode choke for DSL line – owenduffy.net
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Vacuum capacitors – construction implications for SRF – owenduffy.net
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Vacuum capacitors – construction implications for Q – owenduffy.net
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60dBm.com 0.1-3000MHz Return Loss Bridge – owenduffy.net
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Baofeng charger DC-DC converter – owenduffy.net
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A comparo of two bare light dimmer modules – owenduffy.net
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Chinese no-name 1-1000MHz Return Loss Bridge – owenduffy.net
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Do we sound like a bunch of chooks or what? – owenduffy.net
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Review of inexpensive QRP ATU kit from eBay – owenduffy.net
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Where do µ’ and µ” come from? – owenduffy.net
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Admin – owenduffy.net
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Amateur Radio – owenduffy.net
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Antenna Tuners (ATU) – owenduffy.net
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Antennas – owenduffy.net
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APRS – owenduffy.net
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Arduino – owenduffy.net
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Baluns – owenduffy.net
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Computing – owenduffy.net
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Cooking – owenduffy.net
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Electrical – owenduffy.net
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Electronics – owenduffy.net
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Maker – owenduffy.net
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Measurement – owenduffy.net
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Miscellaneous – owenduffy.net
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RC models – owenduffy.net
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Receivers – owenduffy.net
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RPi – owenduffy.net
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Slot cars – owenduffy.net
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Small Transmitting Loops – owenduffy.net
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Telecommunications – owenduffy.net
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Test equipment – owenduffy.net
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Transmission lines – owenduffy.net
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Transmitters – owenduffy.net
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Uncategorized – owenduffy.net
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VK1OD projects – owenduffy.net
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Digital document signatures – owenduffy.net
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Listings – owenduffy.net
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My Listings – owenduffy.net
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Search Results – owenduffy.net
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VK1OD.net closure – owenduffy.net
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AIM use & issues – owenduffy.net
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Designing high performance VHF/UHF receive systems – owenduffy.net
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Exploiting your antenna analyser – owenduffy.net
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IC-7410 tests – owenduffy.net
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Noise FIgure Meter – owenduffy.net
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RFPM1 – owenduffy.net
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Surecom SW-102 VSWR meter review – owenduffy.net
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Should you trust your VSWR meter – linearisation – owenduffy.net
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T962 IR reflow oven rework #2 – owenduffy.net
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Should you trust your VSWR meter – detector linearity – owenduffy.net
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Should you trust your VSWR meter? – owenduffy.net
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Co-phased collinear for 2m – discussion of phasing devices – owenduffy.net
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T962 IR reflow oven rework – owenduffy.net
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Arduino SAMD21 bootloader protection – owenduffy.net
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IoT – exploration of LoRaWAN – part 2 – owenduffy.net
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June 2015 – owenduffy.net
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May 2015 – owenduffy.net
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April 2015 – owenduffy.net
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March 2015 – owenduffy.net
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February 2015 – owenduffy.net
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January 2015 – owenduffy.net
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December 2014 – owenduffy.net
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November 2014 – owenduffy.net
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October 2014 – owenduffy.net
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September 2014 – owenduffy.net
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August 2014 – owenduffy.net
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July 2014 – owenduffy.net
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June 2014 – owenduffy.net
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May 2014 – owenduffy.net
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April 2014 – owenduffy.net
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March 2014 – owenduffy.net
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February 2014 – owenduffy.net
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January 2014 – owenduffy.net
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December 2013 – owenduffy.net
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owenduffy.net – Page 95 – Mostly electronics…
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Arduino RC servo ramp generator – owenduffy.net
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Antennas and Q – owenduffy.net
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The sign of reactance – owenduffy.net
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Measuring matched line loss – owenduffy.net
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Rigexpert’s Antscope takes a step backwards – owenduffy.net
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QRP quarterly on small transmitting loop efficiency – owenduffy.net
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Reconciliation of Duffy CCS model with N7WS ladder line measurements – owenduffy.net
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ESP8266 relay module review – Yunshan WiFi relay – owenduffy.net
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Small untuned loop for receiving – optimal loop load resistance – owenduffy.net
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Small untuned loop for receiving – Trask noise and gain analysis – owenduffy.net
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Reset helper for NodeMCU ESP8266 modules – owenduffy.net
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Loss of JSC ladder line at 160m – owenduffy.net
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TYT (Tytera) MD-390 speaker mic plug compatibility issues – owenduffy.net
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Retevis MD-380 speaker mic modification to reduce RF interference – owenduffy.net
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Ten-tec on the meaning of SWR – owenduffy.net
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A prototype small 4:1 broadband RF transformer using medium µ ferrite core for receiving use – owenduffy.net
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A method for design of small broadband RF transformers using medium µ ferrite core for receiving use – owenduffy.net
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Turning 1kW into QRP – owenduffy.net
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Rigexpert Antscope v4.2.85 released – owenduffy.net
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OCF short vertical dipole for HF – VY1GP – owenduffy.net
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Effective Radiated Power (ERP) – owenduffy.net
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Cadweld Plus Control Unit – owenduffy.net
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AD9850 / AD9851 initialisation using PllLdr – owenduffy.net
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ADF4351 / PllLdr checkout – owenduffy.net
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Effective RF resistance of a braided solenoid – Gilbert’s coil measurements – owenduffy.net
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Post mortem review of a 144MHz combiner / splitter – owenduffy.net
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Transmitter pulse generator for SSB RF PA adjustment – owenduffy.net
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?s=IC2200H+cooling&feed=rss2
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Cooling an IC2200H – update #2 – owenduffy.net
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Cooling an IC2200H – update – owenduffy.net
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Cooling an FT2800M – owenduffy.net
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Review of inexpensive Chinese thermostat – STC-1000 – owenduffy.net
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Can a hand held analyser be used to evaluate Insertion VSWR of a VSWR meter? – owenduffy.net
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Ratings of coax antenna switches – owenduffy.net
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InsertionLoss implies InsertionVSWR in lossless devices – owenduffy.net
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Seriously Pro F3 flight controller gyro/acc failure – owenduffy.net
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Flashing SeriouslyProF3 Cleanflight using ST-LINKV2 – owenduffy.net
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Cleanflight – initialisation failure beeps – owenduffy.net
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Chinese AD8307 power measurement module #2 – owenduffy.net
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UV cure adhesive for temperature sensors – owenduffy.net
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PAROT with transformerless power supply and 10A SSR – owenduffy.net
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Amateur Radio – Page 65 – owenduffy.net
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Variac refurb – owenduffy.net
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An Emergency Stop switch for the mill – owenduffy.net
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Chinese AD8307 power measurement module #3 – owenduffy.net
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Chinese AD8307 power measurement module #1 – owenduffy.net
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RC PWM – ON/OFF switch – owenduffy.net
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Dipole mode component of VK5BR’s 1m square loop for 20m – owenduffy.net
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An NEC-4.2 model of VK5BR’s 1m square loop for 20m – owenduffy.net
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Dipole mode of Small Transmitting Loop per King – owenduffy.net
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Calculation of equivalent self capacitance of Small Transmitting Loop – ARRL – owenduffy.net
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Calculation of equivalent self capacitance of Small Transmitting Loop – owenduffy.net
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G/T spreadsheet update (v1.09) – owenduffy.net
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Does VSWR damage HF ham transmitters – owenduffy.net
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Transmission line loss under mismatch explanations – the missing TWLLC model – owenduffy.net
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Transmission line loss under mismatch explanations – owenduffy.net
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DIY USB password generator – (USB PRC) enhanced #1 – owenduffy.net
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DIY USB password generator – owenduffy.net
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Some thoughts on the popular Carolina Windom antenna – owenduffy.net
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Bulk file rename using regular expressions on Windows – owenduffy.net
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Mini60 antenna analyser – owenduffy.net
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Search Results for “collinear” – owenduffy.net
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An experience with STC 8051 microcontrollers – owenduffy.net
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Folding back the ends of a wire dipole – owenduffy.net
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Capacitive loading device for fine tuning wire dipoles – owenduffy.net
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Review of inexpensive Chinese thermostat – 8010F – owenduffy.net
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Review of inexpensive Chinese thermostat – MH-1210 – owenduffy.net
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VK3IL’s 3m circumference LDF4-50B loop on 20m – owenduffy.net
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VK3IL’s 3m circumference LDF4-50B loop on 40m – owenduffy.net
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Enhancement of Calculate small transmitting loop gain from bandwidth measurement – owenduffy.net
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Review of Banggood digital clock kit #2 – owenduffy.net
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Review of Banggood digital clock kit – owenduffy.net
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VK3YE’s 3m circumference copper tube loop with RG213 stub tuning – owenduffy.net
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BLDC ESC – effect of insufficient dead time – owenduffy.net
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The half waves of coax rule for measuring VSWR accurately – owenduffy.net
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Are gamma matches as bad as all that – owenduffy.net
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TLW v3.24 checkout – owenduffy.net
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Exploitation of NEC’s GM card – owenduffy.net
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NEC – current or voltage source – owenduffy.net
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Small Transmitting Dipole – owenduffy.net
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LM386 audio power amplifiers – owenduffy.net
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APRS: does pre-emphasis make much difference – owenduffy.net
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APRS: how popular are Kenwood trackers – owenduffy.net
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APRS: popularity of iGate system software – owenduffy.net
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Paccomm Tiny-2 MK-II TNC review – owenduffy.net
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A compact 3 element Yagi for 2m – owenduffy.net
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Is the W5VJB J dipole novel – owenduffy.net
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A response to VK3HZ’s comment on amateur licence trends – owenduffy.net
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Australian amateur population trends 1998 – 2014 – owenduffy.net
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The mobile APRS W2 digi left town this morning – owenduffy.net
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Argent Data T3-135 review – owenduffy.net
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Open squelch data carrier detect for TNC-2 – owenduffy.net
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Foxtrak review – owenduffy.net
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Interoperability of FoxTrak tracker and Argent Data’s OT3 – Part 1 – owenduffy.net
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Interoperability of FoxTrak tracker and Argent Data’s OT3 – Part 2 – owenduffy.net
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TinyTrak3 v1.42 review – owenduffy.net
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Are inline RF wattmeters really averaging – owenduffy.net
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Earth continuity testing of amateur equipment – owenduffy.net
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Revision of FoxDelta null modem adapter – owenduffy.net
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Adjusting Foxtrak tx audio using an SSB/FM receiver exploiting Bessel zeros to calibrate the modulator – owenduffy.net
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Review of Ceramica ceramic bearing fans – owenduffy.net
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Estimating near field strength with small antennas – owenduffy.net
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Amateur Radio – Page 64 – owenduffy.net
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?s=collinear&feed=rss2
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Ground effects on small transmitting loop efficiency – owenduffy.net
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ESC oscillator accuracy – Silabs internal oscillator – owenduffy.net
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Small transmitting loops and EMR safety – owenduffy.net
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Equivalent circuit of small transmitting loop with auxiliary loop feed – owenduffy.net
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Small transmitting loop – gamma match – owenduffy.net
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Small transmitting loop – linear circuit analysis – owenduffy.net
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Additional loss due to VSWR – a quite flawed concept – owenduffy.net
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Small transmitting loop – NEC-4 analysis – owenduffy.net
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Antennas – Page 39 – owenduffy.net
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Electronics – Page 20 – owenduffy.net
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ARRL Test Procedures Manual (Rev L) – Noise Figure calculation – owenduffy.net
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IC-7410 tests – 04 – Tx power & SWR meter – owenduffy.net
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IoT – Page 3 – owenduffy.net
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IC-7000 current consumption – owenduffy.net
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Atten AT191 review – owenduffy.net
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Are radio hams ‘makers’ – owenduffy.net
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A/B comparison test on 40m – owenduffy.net
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I2C – LCD interface – Type 1 – owenduffy.net
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Hobbyking A30 issues – owenduffy.net
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Some thoughts on zero crossing detection in sensorless brushless DC motors – owenduffy.net
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COMP_PWM and SimonK ESC firmware – owenduffy.net
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Australia’s NBN debacle limps on under a new government and new CEO – owenduffy.net
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Hobbywing Skywalker 40A ESC – initial testing – owenduffy.net
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Speaker cable as RF transmission line – owenduffy.net
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HK DT750 motor, Afro30 ESC and SimonK 8c2cf42/comp_pwm – owenduffy.net
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Windowed ladder line loss – G3TXQ – owenduffy.net
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Review of Hakko FG-100 soldering iron thermometer – owenduffy.net
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ESC ceramic resonator accuracy – owenduffy.net
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Foundation watts explained – owenduffy.net
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WSPR checkout on 30m – owenduffy.net
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Come-along from the past – owenduffy.net
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Adapting a 5V TTL GPS to RS232 – owenduffy.net
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Cobwebb antenna impedance matching scheme – owenduffy.net
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Measuring common mode current on coax – owenduffy.net
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RG174 for portable HF operation – owenduffy.net
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An inexpensive current limiter for flashing and initial testing of ESCs – Mk I – owenduffy.net
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New ham licence, finally! – owenduffy.net
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Tricopter build – 20140123 – owenduffy.net
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SimonK ESC FW – test of commit 8873df24… – owenduffy.net
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TV upgrade – owenduffy.net
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Wire current rating for single FEP (Teflon) or Silicone insulated (200°) conductor in free air (30°). – owenduffy.net
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Windowed ladder line loss – G3TXQ #2 – owenduffy.net
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3030 antenna – owenduffy.net
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Foundation manual on power measurement – owenduffy.net
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Do SWR meters make you stupid – owenduffy.net
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Tricopter build – 20140131 – owenduffy.net
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Small transmitting loop review – owenduffy.net
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WIA 4:1 current balun – owenduffy.net
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DHT22 (AM2302) input for the generic heating / cooling controller – owenduffy.net
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Cheap and nasty 50Ω SMA terminations – owenduffy.net
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Ground plane ham myth – inclined radials – owenduffy.net
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MFJ-225 – sign of reactance – owenduffy.net
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Estimating the voltage impressed on the tuning capacitor of a small transmitting loop – owenduffy.net
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A QRP small transmitting loop evaluation – owenduffy.net
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Precise RF small transmitting loop – owenduffy.net
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Small untuned loop for receiving – owenduffy.net
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What does an Antenna Tuning Unit (ATU) do? – owenduffy.net
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Efficiency / gain of a Small Transmitting Loop – a worked example – owenduffy.net
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WSPR checkout on new workstation – owenduffy.net
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DS18B20 input for the generic heating / cooling controller – owenduffy.net
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ARRL Antenna Book 21 on small transmitting loops – owenduffy.net
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A QRP small transmitting loop evaluation – owenduffy.net
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G4YDM balun – owenduffy.net
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Another speaker mic modification to reduce RF interference – owenduffy.net
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Speaker-microphones and DMR portables – owenduffy.net
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Rigexpert Antscope v4.3.1 dowload link? – owenduffy.net
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End fed matching – VK3IL design on LO1238 – owenduffy.net
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LP-100A impedance measurement – owenduffy.net
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Another RFI mod of a speaker mic (41-80K) for DMR use – owenduffy.net
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COMP_PWM and SimonK ESC firmware – part 2 – owenduffy.net
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BLHeli v11.2 damping evaluation – owenduffy.net
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Robust programming of Silabs based BLHeli ESCs – owenduffy.net
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LED lighting woes – owenduffy.net
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Anatomy of an F barrel (F81) – owenduffy.net
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Reflected power alarm for the MFJ-993B – owenduffy.net
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Backup options for NBN VDSL access – owenduffy.net
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mpd on a RPi, streamripper and sox – owenduffy.net
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OCF short vertical dipole for HF – owenduffy.net
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Toshiba alkaline AA leakage problems – owenduffy.net
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NEC GM, GX tutorial – owenduffy.net
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End fed half wave – NEC models for 20m – owenduffy.net
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Cooling an IC2200H – owenduffy.net
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Thinking about vibration forces from a bent prop adapter – owenduffy.net
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Cleanflight and PPM – owenduffy.net
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Optimal Zo for TLT sections challenge – a solution – owenduffy.net
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Optimal Zo for Guanella balun sections – owenduffy.net
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Comparison of SimonK and BLHeli 14.6 on an Afro30 ESC – owenduffy.net
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Dataflash on NAZE32 – owenduffy.net
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Coax switches – is shorting unused port necessary for isolation? – owenduffy.net
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Chinese AD8307 power measurement module #4 – owenduffy.net
-
W2AU 1:1 voltage balun – owenduffy.net
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PAROT with transformerless power supply and 230V AC relay – owenduffy.net
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Expected ambient noise – in practice – owenduffy.net
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Expected ambient noise – owenduffy.net
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Review of Dunlavy’s STL patent gain claims – owenduffy.net
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Exploiting your antenna analyser #18 – owenduffy.net
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Exploiting your antenna analyser #17 – owenduffy.net
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Fox flasher MkII – high power 2 LED solar powered beacon – owenduffy.net
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Exploiting your antenna analyser #16 – owenduffy.net
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Revised thinking on STC chips – owenduffy.net
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Exploiting your antenna analyser #4 – owenduffy.net
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Exploiting your antenna analyser #3 – owenduffy.net
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Exploiting your antenna analyser #2 – owenduffy.net
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Exploiting your antenna analyser #1 – owenduffy.net
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Review of Austin et al paper “Loss mechanisms in the electrically small loop antenna” – owenduffy.net
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Underhill on Small Transmitting Loop efficiency – owenduffy.net
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The BLHeli sojourn is over – owenduffy.net
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BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #2 – owenduffy.net
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NAZE32 / Cleanflight trial – owenduffy.net
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A method for initial ground loss estimates for an STL – owenduffy.net
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Fox flasher MkII #3 – owenduffy.net
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Matching a quarter wave monopole with two variable caps – owenduffy.net
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Fox flasher MkII #2 – owenduffy.net
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Differential and common mode components of current in a two wire transmission line – owenduffy.net
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Capturing the AVR hex file built by Arduino on Windows – owenduffy.net
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VSWR curve of a simple series resonant antenna – owenduffy.net
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Coupled coils – a challenge for hams! – owenduffy.net
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An inexpensive Chinese regulated power supply kit. – owenduffy.net
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BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – owenduffy.net
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Comparison of SimonK and BLHeli on an Afro30 ESC – owenduffy.net
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Exploitation of NEC’s GM card #2 – owenduffy.net
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APRS traffic study – VK2OMD-3 08/02/2015 – owenduffy.net
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APRS traffic study – VK2OMD-3 11/10/2014 – owenduffy.net
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Comparison of two small transmitting loops – owenduffy.net
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BNC 75/50 compatibility – owenduffy.net
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Low power Guanella 1:1 tuner balun using a pair of Fair-rite 2643625102 suppression sleeves – owenduffy.net
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Radcom review of Alpha Antenna microtune magnetic loop – owenduffy.net
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Another Osram e-ballast bites the dust – owenduffy.net
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An example of Eb/N0 design with the Field strength / receive power converter – owenduffy.net
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Packet loss by digi collision – owenduffy.net
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Another Argent Data T3 incompatibility – owenduffy.net
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APRS: how many digi hops to make it to APRS-IS – owenduffy.net
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The future of APRS is here… – owenduffy.net
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A simple preamp for dynamic capsules to suit radios using electret microphones – owenduffy.net
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TNC-X – channel access behaviour – owenduffy.net
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Does anyone assess to their digi / iGate performance? – owenduffy.net
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Ubuntu LTS upgrades get better – v14.04 – owenduffy.net
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Open squelch DCD for Paccomm Tiny2 Mk2 – owenduffy.net
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Unun on 13m (43′) vertical – owenduffy.net
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Ground effects on KP4MD’s 0.9m loop on 28MHz – owenduffy.net
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Amateur Radio – Page 63 – owenduffy.net
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Small transmitting loop EMR safety – EMR Calc predictions – owenduffy.net
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Validation of loop efficiency calculator – owenduffy.net
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Simple resonators might not appear as such initially – owenduffy.net
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Coax connectors and accurate / repeatable measurements – owenduffy.net
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SimonK ESC FW – test of commit 1f75da – #3 – owenduffy.net
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BLHeli v11.0 on APM X450 quad – owenduffy.net
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ON9CVD on baluns – owenduffy.net
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The magic of small transmitting loops – owenduffy.net
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OCF dipoles – owenduffy.net
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(How) does this balun work? – owenduffy.net
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SimonK ESC FW – test of commit 1f75da – #2 – owenduffy.net
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Assembling clamp type coax connectors – owenduffy.net
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An inexpensive current limiter for flashing and initial testing of ESCs – Mk II – owenduffy.net
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Mag loop or radiating dummy load? – owenduffy.net
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PIK and auto-space – owenduffy.net
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Trying to make sense of the VE7BQH Yagi performance tables – owenduffy.net
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EME path calculation based on G/T – owenduffy.net
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Simple Morse beacon keyer updated 2014/03/01 – owenduffy.net
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Analysers – help or hindrance – owenduffy.net
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VK2OMD G5RV with tuned feeder – line loss – owenduffy.net
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Using Ohms law on antenna baluns – owenduffy.net
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DJ9BV & F6HYE G/T formula – owenduffy.net
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Update for NFM software (v1.18.0) – owenduffy.net
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High performance 144MHz transverter design workup – noise and gain analysis – owenduffy.net
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Checkout of EMRCalc quiet solar flux report – owenduffy.net
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G5RV woes – W6OGC – owenduffy.net
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Measuring G/T – owenduffy.net
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DJ3JJ’s 432MHz EME Yagi article in Dubus 1/2010 – owenduffy.net
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SimonK ESC FW – test of commit 1f75da – #4 – owenduffy.net
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Slot car controller connectors – AU – owenduffy.net
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Mining K5SO’s measurements of Sun noise – owenduffy.net
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EMECalc v9.09 reconciliation issue – owenduffy.net
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Owen – owenduffy.net
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AIMuhf – my strategy – owenduffy.net
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Diamond X50N measurements – AIMuhf and AA-600 – owenduffy.net
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Making sense of LED output figures – owenduffy.net
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A tale of three tuners – owenduffy.net
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HC-500 – owenduffy.net
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A generic run on timer using an ATTINY25 – owenduffy.net
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Improved cooling for the MFJ-949E – owenduffy.net
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Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #4 – owenduffy.net
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Precision GPS experiment #1 – owenduffy.net
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A look at internal losses in a typical ATU – owenduffy.net
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Small transmitting loop – ground loss relationship to radiation resistance – owenduffy.net
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An A/B comparison of a low G5RV with a MobileOne M40-1 – owenduffy.net
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Search Results for “end fed half wave” – owenduffy.net
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Definition: Current Balun, Voltage Balun – owenduffy.net
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Adjusting KISS TNC AFSK tx level using an isochronous test packet – owenduffy.net
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A SPICE model for a Ruthroff 4:1 balun. – owenduffy.net
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Chinese 18650 Li-ion cells – Ultrafire capacity test – owenduffy.net
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APRS duplicate removal – trial #3 – owenduffy.net
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End fed matching – analysis of VK3IL’s measurements – owenduffy.net
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VK3AQZ RF power meter (RFPM1) – owenduffy.net
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Loss of Wireman 553 windowed ladder line at MF/HF – owenduffy.net
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Reconciling W5QJR’s loop formulas – owenduffy.net
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WIA 4:1 current balun – further explanation – owenduffy.net
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High altitude balloon – 2014-02-08 – owenduffy.net
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Common mode current and coaxial feed lines – owenduffy.net
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An inexpensive medium power tuner current balun for HF using Jaycar parts – owenduffy.net
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Balanced ATUs and common mode current – owenduffy.net
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Baluns – show me the numbers – owenduffy.net
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End fed matching – PA3HHO design review #2 – owenduffy.net
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End fed matching – design review – owenduffy.net
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End fed matching – PA3HHO design review – owenduffy.net
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Updated: Calculate initial load line of valve RF amplifier – owenduffy.net
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Red Ironbark picnic table – owenduffy.net
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Identifying ferrite materials #2 – owenduffy.net
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Identifying ferrite materials – owenduffy.net
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Reconciling my #52 choke design tool with G3TXQ’s measurements – owenduffy.net
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Some tools for designing a Guanella 1:1 balun using ferrite toroids – owenduffy.net
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Exploiting your antenna analyser #14 – owenduffy.net
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Exploiting your antenna analyser #13 – owenduffy.net
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Low Insertion VSWR HF Guanella 1:1 balun for instrumentation – owenduffy.net
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A little rigging this week (20160204) – owenduffy.net
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APRS duplicate removal – trial #2 – owenduffy.net
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OpenLog for TinyTrak – owenduffy.net
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Lithium battery – 1S protection boards – owenduffy.net
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Exploiting your antenna analyser #12 – owenduffy.net
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Canberra trip – APRS / GPS logger – owenduffy.net
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Exploiting your antenna analyser #11 – owenduffy.net
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ATU voltage verification – owenduffy.net
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Review of Trask’s 1:1 current balun – owenduffy.net
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Feeding at a current maximum, and three other options – owenduffy.net
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APRS – APRS-IS latency – owenduffy.net
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Exploiting your antenna analyser #6 – owenduffy.net
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Exploiting your antenna analyser #7 – owenduffy.net
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Hosting change – owenduffy.net
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VSWR=1 and Xâ 0 – owenduffy.net
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Win 10 Threshold 2 issues – owenduffy.net
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Panasonic NCR18650B Lithium Ion cells on eBay – owenduffy.net
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18650 Lithium Ion cells on eBay – owenduffy.net
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ANS T1.523-2001, Telecom Glossary 2000 and Return Loss – owenduffy.net
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Update for FSM software (v1.11.0) – owenduffy.net
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On negative VSWR – owenduffy.net
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Can the magnitude of the complex reflection coefficient (Ï) be greater than 1 – owenduffy.net
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Quiet solar radio flux interpolations calculator – owenduffy.net
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Search Results for “qsrf” – owenduffy.net
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NEC model of the quarter size G5RV – owenduffy.net
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WSPR version confusion – owenduffy.net
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Evolution of WSPR – owenduffy.net
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A new impedance calculator for RF inductors on ferrite cores – owenduffy.net
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Effect of shorting turns on a tapped air cored solenoid at RF – owenduffy.net
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4NEC2 plots of STL VSWR – owenduffy.net
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Implementation of G5RV inverted V using high strength aluminium MIG wire – owenduffy.net
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DK7ZB’s balun – owenduffy.net
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Baofeng GT-5TP – first impressions – owenduffy.net
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?feed=rss2&cat=21
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New hosting service – 2016/08/10 – owenduffy.net
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Apologies for service disruption – owenduffy.net
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It has been two years already… – owenduffy.net
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owenduffy.net performance improvement – owenduffy.net
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Interesting Links – owenduffy.net
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owenduffy.net rework – owenduffy.net
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?feed=rss2&cat=3
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Amateur Radio – Page 2 – owenduffy.net
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?feed=rss2&cat=19
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End Fed Half Wave matching transformer – 80-20m – owenduffy.net
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Is a ham transmitter conjugate matched to its load? – owenduffy.net
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KL7AJ on the Conjugate Match Theorem – owenduffy.net
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KL7AJ on the Conjugate Match Theorem – analytical solution – owenduffy.net
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True balanced tuner – owenduffy.net
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Matching a 5/8λ ground plane – owenduffy.net
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Icom IC-7410 – PTT tuner start doesn’t work – owenduffy.net
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Antenna Tuners (ATU) – Page 2 – owenduffy.net
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Antenna Tuners (ATU) – Page 4 – owenduffy.net
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?feed=rss2&cat=9
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Antennas – Page 2 – owenduffy.net
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?feed=rss2&cat=22
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U-BLOX LEA-6T GPS module – for experiments – owenduffy.net
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APRS duplicate removal – owenduffy.net
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Trial of prototype stand alone GPS logger – owenduffy.net
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ATUs and periodic maintenance – owenduffy.net
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Measuring balun common mode impedance â #3 – owenduffy.net
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Small common mode choke for analyser antenna measurements using 2843000202 (BN43-202) – owenduffy.net
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An Arduino utility for the RW1990 rewriteable serial number touch memory – owenduffy.net