Last updated: 2018, September 21 11:31:06
Total pages: 2247 owenduffy.net Homepage

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  • August 2017 – Page 2 – owenduffy.net
  • AE7PD’s transmitting loop measurements – owenduffy.net
  • Findling & Siwiak 2012 measurements of an Alexloop – discussion – owenduffy.net
  • G3CWI 2018 measurements of an Alexloop Walkham – owenduffy.net
  • Findling & Siwiak 2012 measurements of an Alexloop – owenduffy.net
  • Single turn coaxial loop resonator analysis – owenduffy.net
  • WW1WW’s matching transformer for an EFHW – owenduffy.net
  • AIM 914 produces internally inconsistent results – 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
  • Cheap Chinese wristwatch #2 – owenduffy.net
  • Transmission line measurements – learning from failure – owenduffy.net
  • Cheap Chinese wristwatch #1 – 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
  • 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
  • Feasibility study – loop in ground for rx only on low HF – trial topology selection – owenduffy.net
  • Feasibility study – loop in ground for rx only on low HF – owenduffy.net
  • VSWR meter trap for the unwary – 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
  • Portune’s magic windowed ladder line – owenduffy.net
  • Another small broadband RF transformer using medium µ ferrite core for receiving use – 50:3200Ω – owenduffy.net
  • Implementation of G5RV inverted V using high strength aluminium MIG wire – 12 month review – owenduffy.net
  • Anytone AT-D868UV: initial impressions – owenduffy.net
  • Pulsar V233-0060 stripped down – owenduffy.net
  • 40m filter for WSPRlite flex – owenduffy.net
  • Another RFI mod of a speaker mic for DMR use – owenduffy.net
  • WSPR for A/B tests – a discussion – part 4 – owenduffy.net
  • Initial review of Owon virtual (USB) oscilloscopes – owenduffy.net
  • WSPR for A/B tests – a discussion – part 3 – 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 2 – owenduffy.net
  • WSPR for A/B tests – a discussion – part 1 – owenduffy.net
  • 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
  • Small efficient matching transformer for an EFHW – owenduffy.net
  • PD7MAA’s BN43-202 matching transformer for an EFHW – owenduffy.net
  • September 2018 – owenduffy.net
  • August 2018 – owenduffy.net
  • July 2018 – owenduffy.net
  • June 2018 – owenduffy.net
  • owenduffy.net – Page 92 – Mostly electronics…
  • On Witt’s calculation of Matched Line Loss from Return Loss – owenduffy.net
  • BN-43-2402 balun example – owenduffy.net
  • owenduffy.net – Page 91 – Mostly electronics…
  • owenduffy.net – Page 90 – Mostly electronics…
  • owenduffy.net – Page 89 – Mostly electronics…
  • Implementation of G5RV inverted V using high strength aluminium MIG wire – impedance measurements – owenduffy.net
  • EME Calc v11.11 reconciliation issues – owenduffy.net
  • Workup of G5RV inverted V using high strength aluminium MIG wire – owenduffy.net
  • July 2017 – Page 2 – owenduffy.net
  • High gain external antenna for Wemos ProMini – owenduffy.net
  • Typical zinc thickness on zinc coated products used for antennas – owenduffy.net
  • A model of current distribution in copper clad steel conductors at RF – owenduffy.net
  • 80m half wave dipole made from galvanised fence wire – owenduffy.net
  • 80m half wave dipole made from 0.91mm steel MIG wire – owenduffy.net
  • Exploiting waveguide mode of the loop conductor in a small transmitting loop – owenduffy.net
  • June 2017 – Page 2 – owenduffy.net
  • The sign of reactance – SM6WHY’s take – 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
  • Small untuned loop for receiving – is an amplifier necessary? – owenduffy.net
  • May 2017 – Page 2 – owenduffy.net
  • The Mobius strip loop – ham benefits – 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
  • Efficiency and gain of Small Transmitting Loops (STL) – owenduffy.net
  • Skin depth in copper at 1.8MHz according to QRZ – owenduffy.net
  • April 2017 – Page 2 – 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
  • Small transmitting loop calculators – a comparison – 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
  • VY Commodore key repair – owenduffy.net
  • January 2017 – Page 2 – owenduffy.net
  • Rigexpert Antscope v4.3.1 released – 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
  • Radio-Kits SWR meter – build and review – 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
  • MFJ-993B internal balun review – owenduffy.net
  • MFJ-993B on my G5RV with tuned feeder – 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
  • Mast ground rework – owenduffy.net
  • Command adapter for JRC NFG-170 NFG-230 ATU – owenduffy.net
  • Demonstration video of Cadweld Oneshot Plus ground rod connection – owenduffy.net
  • September 2016 – Page 2 – owenduffy.net
  • September 2016 – Page 3 – owenduffy.net
  • A certain formula for antenna system Q – 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
  • RC electric drive noise – owenduffy.net
  • August 2016 – Page 2 – 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
  • A drive test of RTKLIB accurate GPS – 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
  • End Fed Half Wave / Inverted L / Half Wave Dipole – owenduffy.net
  • Chinese counterfeiters at it again – EZP2013 – owenduffy.net
  • Some automation to supplement Cleanflight-configurator – owenduffy.net
  • The magic of End Fed Half Waves (EFHW) – 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
  • Transformerless power supply for PAROT – owenduffy.net
  • May 2016 – Page 2 – owenduffy.net
  • Improved cooling for the ATR-30 – 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
  • AUT – MobileOne M40-1 40m helical – owenduffy.net
  • USB-A to DC 5.5/2.1mm power cable – current carrying capacity – owenduffy.net
  • PIK – owenduffy.net
  • Counterfeit FTDI – owenduffy.net
  • Low power Guanella 1:1 balun with low Insertion VSWR using a pair of Jaycar LF1260 suppression sleeves – owenduffy.net
  • Is maximum power transfer and conjugate matching simultaneously possible – owenduffy.net
  • Walter Maxwell’s teachings on system wide conjugate matching – 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
  • Exploiting your antenna analyser #5 – owenduffy.net
  • December 2015 – Page 2 – owenduffy.net
  • December 2015 – Page 3 – owenduffy.net
  • Proposed 60m amateur band power limit – owenduffy.net
  • QRP antennas – owenduffy.net
  • Reconciliation of field strength to efficiency calculator with Boswell’s loop measurements – 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
  • NBN is coming… it seems – owenduffy.net
  • OpenLog for TinyTrak – drive test – owenduffy.net
  • Australian amateur population trends 1998 – 2015 – owenduffy.net
  • Trombone capacitors in Small Transmitting Loops – owenduffy.net
  • Adjusting KISS TNC AFSK tx level using an improved isochronous test packet – owenduffy.net
  • Steel wire CF dipole on 160m – owenduffy.net
  • Galvanised steel wire CF dipole – owenduffy.net
  • Galvanised steel wire OCF dipole – owenduffy.net
  • October 2015 – Page 2 – owenduffy.net
  • Are copper clad VHF whips a marketing ploy – owenduffy.net
  • Differential flux leakage in a Guanella 1:1 balun – an experiment – 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
  • Helical loading and Calculate small transmitting loop gain from bandwidth measurement – owenduffy.net
  • Designing a Guanella 1:1 balun using the ‘unknown’ ferrite toroid – owenduffy.net
  • September 2015 – Page 2 – owenduffy.net
  • Silicon Chip Collinear – owenduffy.net
  • Yet another dodgy coax collinear II – owenduffy.net
  • Yet another dodgy coax collinear – owenduffy.net
  • APRS trial Bowral – Wilton – Wollongong – Macquarie Pass – Bowral – owenduffy.net
  • An A/B comparison of a low G5RV with a MobileOne M40-1 – statistical analysis – owenduffy.net
  • NEC-4 vs NEC-2 on a low small transmitting loop – owenduffy.net
  • USBTiny – owenduffy.net
  • A tale of two USB-RS232 adapters – owenduffy.net
  • August 2015 – Page 2 – owenduffy.net
  • Effect of ground on HF horizontal dipole efficiency – more detail – owenduffy.net
  • Effect of ground on HF horizontal dipole efficiency – owenduffy.net
  • Solar power supply for foxflasher2 – owenduffy.net
  • Fox flasher MkII – owenduffy.net
  • Arduino HMC5883 magnetometer – a tutorial – owenduffy.net
  • Arduino stepper motor – a tutorial – owenduffy.net
  • I2C – LCD interface – Type 2 – owenduffy.net
  • An interesting case study – in service evaluation of coax loss – owenduffy.net
  • RC4 thermistor characterisation. – owenduffy.net
  • July 2015 – Page 2 – 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Ground effects on KP4MD’s 0.9m loop on 28MHz – owenduffy.net
  • Analysers – help or hindrance – owenduffy.net
  • Small transmitting loop EMR safety – EMR Calc predictions – owenduffy.net
  • June 2014 – Page 2 – owenduffy.net
  • Simple resonators might not appear as such initially – owenduffy.net
  • (How) does this balun work? – owenduffy.net
  • VSWR curve of a simple series resonant antenna – owenduffy.net
  • A QRP small transmitting loop evaluation – owenduffy.net
  • ARRL Antenna Book 21 on small transmitting loops – owenduffy.net
  • OCF dipoles – owenduffy.net
  • BLHeli v11.2 damping evaluation – owenduffy.net
  • May 2014 – Page 2 – owenduffy.net
  • ON9CVD on baluns – owenduffy.net
  • DJ9BV & F6HYE G/T formula – owenduffy.net
  • DJ3JJ’s 432MHz EME Yagi article in Dubus 1/2010 – owenduffy.net
  • EMECalc v9.09 reconciliation issue – owenduffy.net
  • Mining K5SO’s measurements of Sun noise – owenduffy.net
  • Measuring G/T – owenduffy.net
  • Checkout of EMRCalc quiet solar flux report – owenduffy.net
  • EME path calculation based on G/T – owenduffy.net
  • Comparison of SimonK and BLHeli on an Afro30 ESC – owenduffy.net
  • BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – owenduffy.net
  • BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #2 – owenduffy.net
  • April 2014 – Page 2 – owenduffy.net
  • Assembling clamp type coax connectors – owenduffy.net
  • COMP_PWM and SimonK ESC firmware – part 2 – owenduffy.net
  • SimonK ESC FW – test of commit 1f75da – #2 – owenduffy.net
  • SimonK ESC FW – test of commit 1f75da – #3 – owenduffy.net
  • IC-7410 tests – 04 – Tx power & SWR meter – owenduffy.net
  • Coax connectors and accurate / repeatable measurements – 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
  • Unun on 13m (43′) vertical – owenduffy.net
  • ARRL Test Procedures Manual (Rev L) – Noise Figure calculation – owenduffy.net
  • An inexpensive current limiter for flashing and initial testing of ESCs – Mk II – owenduffy.net
  • An inexpensive current limiter for flashing and initial testing of ESCs – Mk I – owenduffy.net
  • February 2014 – Page 2 – owenduffy.net
  • February 2014 – Page 4 – owenduffy.net
  • Tricopter build – 20140131 – owenduffy.net
  • Cobwebb antenna impedance matching scheme – owenduffy.net
  • Measuring common mode current on coax – owenduffy.net
  • RG174 for portable HF operation – owenduffy.net
  • New ham licence, finally! – owenduffy.net
  • Tricopter build – 20140123 – owenduffy.net
  • SimonK ESC FW – test of commit 8873df24… – owenduffy.net
  • TV upgrade – owenduffy.net
  • January 2014 – Page 2 – owenduffy.net
  • Foundation watts explained – owenduffy.net
  • Are radio hams ‘makers’ – owenduffy.net
  • A/B comparison test on 40m – owenduffy.net
  • I2C – LCD interface – Type 1 – owenduffy.net
  • Hobbyking A30 issues – owenduffy.net
  • Some thoughts on zero crossing detection in sensorless brushless DC motors – owenduffy.net
  • December 2013 – Page 2 – owenduffy.net
  • Australia’s NBN debacle limps on under a new government and new CEO – owenduffy.net
  • IC-7000 current consumption – owenduffy.net
  • Atten AT191 review – owenduffy.net
  • owenduffy.net – Page 87 – Mostly electronics…
  • TNC-X – channel access behaviour – owenduffy.net
  • ?feed=rss2&author=1
  • Owen – Page 2 – owenduffy.net
  • Owen – Page 88 – owenduffy.net
  • ?s=end+fed+half+wave&feed=rss2
  • End fed half wave – NEC models for 20m – owenduffy.net
  • Search Results for “end fed half wave” – Page 2 – owenduffy.net
  • Search Results for “end fed half wave” – Page 4 – owenduffy.net
  • Comparison of two small transmitting loops – owenduffy.net
  • HK DT750 motor, Afro30 ESC and SimonK 8c2cf42/comp_pwm – owenduffy.net
  • Speaker cable as RF transmission line – owenduffy.net
  • WIA 4:1 current balun – owenduffy.net
  • Differential and common mode components of current in a two wire transmission line – owenduffy.net
  • Fox flasher MkII #2 – owenduffy.net
  • A method for initial ground loss estimates for an STL – owenduffy.net
  • The future of APRS is here… – owenduffy.net
  • Small transmitting loop review – owenduffy.net
  • Revised thinking on STC chips – owenduffy.net
  • Exploiting your antenna analyser #1 – owenduffy.net
  • ?s=qsrf&feed=rss2
  • DHT22 (AM2302) input for the generic heating / cooling controller – owenduffy.net
  • Estimating the voltage impressed on the tuning capacitor of a small transmitting loop – owenduffy.net
  • Exploiting your antenna analyser #3 – owenduffy.net
  • Exploiting your antenna analyser #4 – owenduffy.net
  • Amateur Radio – Page 3 – owenduffy.net
  • Windowed ladder line loss – G3TXQ – owenduffy.net
  • Wire dipole on 160m – owenduffy.net
  • Amateur Radio – Page 61 – owenduffy.net
  • MFJ-225 – sign of reactance – owenduffy.net
  • Reflected power alarm for the MFJ-993B – owenduffy.net
  • Anatomy of an F barrel (F81) – owenduffy.net
  • LED lighting woes – owenduffy.net
  • Antenna Tuners (ATU) – Page 3 – owenduffy.net
  • Low power Guanella 1:1 tuner balun using a pair of Fair-rite 2643625102 suppression sleeves – owenduffy.net
  • What does an Antenna Tuning Unit (ATU) do? – owenduffy.net
  • Antennas – Page 3 – owenduffy.net
  • Antennas – Page 36 – owenduffy.net
  • Coax switches – is shorting unused port necessary for isolation? – owenduffy.net
  • Dataflash on NAZE32 – owenduffy.net
  • Review of Austin et al paper “Loss mechanisms in the electrically small loop antenna” – owenduffy.net
  • The BLHeli sojourn is over – owenduffy.net
  • APRS traffic study – VK2OMD-3 08/02/2015 – owenduffy.net
  • APRS traffic study – VK2OMD-3 11/10/2014 – owenduffy.net
  • Packet loss by digi collision – owenduffy.net
  • Another Argent Data T3 incompatibility – owenduffy.net
  • APRS – Page 3 – owenduffy.net
  • APRS – Page 7 – owenduffy.net
  • BG7TBL noise source – owenduffy.net
  • Robust programming of Silabs based BLHeli ESCs – owenduffy.net
  • Thinking about vibration forces from a bent prop adapter – owenduffy.net
  • Review of Dunlavy’s STL patent gain claims – owenduffy.net
  • Fox flasher MkII – high power 2 LED solar powered beacon – owenduffy.net
  • Fox flasher MkII #3 – owenduffy.net
  • Capturing the AVR hex file built by Arduino on Windows – owenduffy.net
  • Simple Morse beacon keyer updated 2014/03/01 – owenduffy.net
  • G4YDM balun – owenduffy.net
  • Optimal Zo for TLT sections challenge – a solution – owenduffy.net
  • Optimal Zo for Guanella balun sections – owenduffy.net
  • W2AU 1:1 voltage balun – owenduffy.net
  • Baluns – Page 3 – owenduffy.net
  • Baluns – Page 6 – owenduffy.net
  • Inductance of a loop of CAT5 pair – owenduffy.net
  • Backup options for NBN VDSL access – owenduffy.net
  • mpd on a RPi, streamripper and sox – owenduffy.net
  • Adapting a 5V TTL GPS to RS232 – owenduffy.net
  • Computing – Page 3 – owenduffy.net
  • Ubuntu LTS upgrades get better – v14.04 – owenduffy.net
  • Computing – Page 4 – owenduffy.net
  • Toshiba alkaline AA leakage problems – owenduffy.net
  • PAROT with transformerless power supply and 230V AC relay – owenduffy.net
  • PAROT with transformerless power supply and 10A SSR – owenduffy.net
  • Electrical – Page 3 – owenduffy.net
  • Another Osram e-ballast bites the dust – owenduffy.net
  • Electronics – Page 3 – owenduffy.net
  • Wire current rating for single FEP (Teflon) or Silicone insulated (200°) conductor in free air (30°). – owenduffy.net
  • Review of Hakko FG-100 soldering iron thermometer – owenduffy.net
  • Electronics – Page 18 – owenduffy.net
  • Maker – Page 3 – owenduffy.net
  • Maker – Page 11 – owenduffy.net
  • Measurement – Page 3 – owenduffy.net
  • Effective Radiated Power (ERP) – owenduffy.net
  • Expected ambient noise – in practice – owenduffy.net
  • DS18B20 input for the generic heating / cooling controller – owenduffy.net
  • Rigexpert Antscope v4.3.1 dowload link? – owenduffy.net
  • End fed matching – VK3IL design on LO1238 – owenduffy.net
  • LP-100A impedance measurement – owenduffy.net
  • Cleanflight and PPM – owenduffy.net
  • Comparison of SimonK and BLHeli 14.6 on an Afro30 ESC – owenduffy.net
  • RC models – Page 3 – owenduffy.net
  • Hobbywing Skywalker 40A ESC – initial testing – owenduffy.net
  • ESC ceramic resonator accuracy – owenduffy.net
  • RC models – Page 6 – owenduffy.net
  • Expected ambient noise – owenduffy.net
  • Receivers – Page 3 – owenduffy.net
  • Receivers – Page 4 – owenduffy.net
  • APRS: how many digi hops to make it to APRS-IS – owenduffy.net
  • Open squelch DCD for Paccomm Tiny2 Mk2 – owenduffy.net
  • Does anyone assess to their digi / iGate performance? – owenduffy.net
  • An inexpensive Chinese regulated power supply kit. – owenduffy.net
  • A QRP small transmitting loop evaluation – owenduffy.net
  • Precise RF small transmitting loop – owenduffy.net
  • QRP quarterly on small transmitting loop efficiency – owenduffy.net
  • Validation of loop efficiency calculator – owenduffy.net
  • The magic of small transmitting loops – owenduffy.net
  • Efficiency / gain of a Small Transmitting Loop – a worked example – owenduffy.net
  • Mag loop or radiating dummy load? – owenduffy.net
  • Small Transmitting Loops – Page 7 – owenduffy.net
  • Come-along from the past – owenduffy.net
  • Small untuned loop for receiving – owenduffy.net
  • OCF short vertical dipole for HF – owenduffy.net
  • An example of Eb/N0 design with the Field strength / receive power converter – owenduffy.net
  • Cheap and nasty 50Ω SMA terminations – owenduffy.net
  • Ground plane ham myth – inclined radials – owenduffy.net
  • Test equipment – Page 3 – owenduffy.net
  • Test equipment – Page 15 – owenduffy.net
  • Transmission lines – Page 3 – owenduffy.net
  • Transmission lines – Page 22 – owenduffy.net
  • Another speaker mic modification to reduce RF interference – owenduffy.net
  • Speaker-microphones and DMR portables – owenduffy.net
  • Another RFI mod of a speaker mic (41-80K) for DMR use – owenduffy.net
  • Ten-tec on the meaning of SWR – owenduffy.net
  • Retevis MD-380 speaker mic modification to reduce RF interference – owenduffy.net
  • TYT (Tytera) MD-390 speaker mic plug compatibility issues – owenduffy.net
  • Transmitters – Page 3 – owenduffy.net
  • Transmitters – Page 14 – owenduffy.net
  • Exploitation of NEC’s GM card #2 – owenduffy.net
  • BNC 75/50 compatibility – owenduffy.net
  • A simple preamp for dynamic capsules to suit radios using electret microphones – owenduffy.net
  • Matching a quarter wave monopole with two variable caps – owenduffy.net
  • Coupled coils – a challenge for hams! – owenduffy.net
  • Radcom review of Alpha Antenna microtune magnetic loop – owenduffy.net
  • Cooling an IC2200H – owenduffy.net
  • Exploiting your antenna analyser #18 – owenduffy.net
  • Exploiting your antenna analyser #17 – owenduffy.net
  • Exploiting your antenna analyser #16 – owenduffy.net
  • Exploiting your antenna analyser #2 – owenduffy.net
  • NEC GM, GX tutorial – owenduffy.net
  • Chinese AD8307 power measurement module #4 – owenduffy.net
  • Slot car controller connectors – AU – owenduffy.net
  • VK2OMD G5RV with tuned feeder – line loss – owenduffy.net
  • Underhill on Small Transmitting Loop efficiency – owenduffy.net
  • NAZE32 / Cleanflight trial – owenduffy.net
  • owenduffy.net – Page 4 – Mostly electronics…
  • WSPR checkout on new workstation – owenduffy.net
  • WSPR checkout on 30m – owenduffy.net
  • A WSPR experiment for station evaluation – owenduffy.net
  • Reconciliation of Duffy CCS model with N7WS ladder line measurements – owenduffy.net
  • ESP8266 relay module review – Yunshan WiFi relay – owenduffy.net
  • Small untuned loop for receiving – optimal loop load resistance – owenduffy.net
  • Small untuned loop for receiving – Trask noise and gain analysis – owenduffy.net
  • Reset helper for NodeMCU ESP8266 modules – owenduffy.net
  • Loss of JSC ladder line at 160m – owenduffy.net
  • A prototype small 4:1 broadband RF transformer using medium µ ferrite core for receiving use – owenduffy.net
  • A method for design of small broadband RF transformers using medium µ ferrite core for receiving use – owenduffy.net
  • Turning 1kW into QRP – owenduffy.net
  • Rigexpert Antscope v4.2.85 released – owenduffy.net
  • OCF short vertical dipole for HF – VY1GP – owenduffy.net
  • Cadweld Plus Control Unit – owenduffy.net
  • AD9850 / AD9851 initialisation using PllLdr – owenduffy.net
  • ADF4351 / PllLdr checkout – owenduffy.net
  • Effective RF resistance of a braided solenoid – Gilbert’s coil measurements – owenduffy.net
  • Post mortem review of a 144MHz combiner / splitter – owenduffy.net
  • Transmitter pulse generator for SSB RF PA adjustment – owenduffy.net
  • ?s=IC2200H+cooling&feed=rss2
  • Cooling an IC2200H – update #2 – owenduffy.net
  • Cooling an IC2200H – update – owenduffy.net
  • Cooling an FT2800M – owenduffy.net
  • Review of inexpensive Chinese thermostat – STC-1000 – owenduffy.net
  • Can a hand held analyser be used to evaluate Insertion VSWR of a VSWR meter? – owenduffy.net
  • Ratings of coax antenna switches – owenduffy.net
  • InsertionLoss implies InsertionVSWR in lossless devices – owenduffy.net
  • Seriously Pro F3 flight controller gyro/acc failure – owenduffy.net
  • Flashing SeriouslyProF3 Cleanflight using ST-LINKV2 – owenduffy.net
  • Cleanflight – initialisation failure beeps – owenduffy.net
  • Chinese AD8307 power measurement module #2 – owenduffy.net
  • UV cure adhesive for temperature sensors – owenduffy.net
  • Variac refurb – owenduffy.net
  • An Emergency Stop switch for the mill – owenduffy.net
  • Chinese AD8307 power measurement module #3 – owenduffy.net
  • Chinese AD8307 power measurement module #1 – owenduffy.net
  • RC PWM – ON/OFF switch – owenduffy.net
  • Dipole mode component of VK5BR’s 1m square loop for 20m – owenduffy.net
  • An NEC-4.2 model of VK5BR’s 1m square loop for 20m – owenduffy.net
  • Dipole mode of Small Transmitting Loop per King – owenduffy.net
  • Calculation of equivalent self capacitance of Small Transmitting Loop – ARRL – owenduffy.net
  • Calculation of equivalent self capacitance of Small Transmitting Loop – owenduffy.net
  • G/T spreadsheet update (v1.09) – owenduffy.net
  • Does VSWR damage HF ham transmitters – owenduffy.net
  • Transmission line loss under mismatch explanations – the missing TWLLC model – owenduffy.net
  • Transmission line loss under mismatch explanations – owenduffy.net
  • DIY USB password generator – (USB PRC) enhanced #1 – owenduffy.net
  • DIY USB password generator – owenduffy.net
  • Some thoughts on the popular Carolina Windom antenna – owenduffy.net
  • Bulk file rename using regular expressions on Windows – owenduffy.net
  • Mini60 antenna analyser – owenduffy.net
  • Search Results for “collinear” – owenduffy.net
  • An experience with STC 8051 microcontrollers – owenduffy.net
  • Folding back the ends of a wire dipole – owenduffy.net
  • Capacitive loading device for fine tuning wire dipoles – owenduffy.net
  • Review of inexpensive Chinese thermostat – 8010F – owenduffy.net
  • Review of inexpensive Chinese thermostat – MH-1210 – owenduffy.net
  • VK3IL’s 3m circumference LDF4-50B loop on 20m – owenduffy.net
  • VK3IL’s 3m circumference LDF4-50B loop on 40m – owenduffy.net
  • Enhancement of Calculate small transmitting loop gain from bandwidth measurement – owenduffy.net
  • Review of Banggood digital clock kit #2 – owenduffy.net
  • Review of Banggood digital clock kit – owenduffy.net
  • VK3YE’s 3m circumference copper tube loop with RG213 stub tuning – owenduffy.net
  • BLDC ESC – effect of insufficient dead time – owenduffy.net
  • The half waves of coax rule for measuring VSWR accurately – owenduffy.net
  • Are gamma matches as bad as all that – owenduffy.net
  • TLW v3.24 checkout – owenduffy.net
  • Exploitation of NEC’s GM card – owenduffy.net
  • NEC – current or voltage source – owenduffy.net
  • Small Transmitting Dipole – owenduffy.net
  • LM386 audio power amplifiers – owenduffy.net
  • Inexpensive utility rechargeable 9V battery pack for test instruments – owenduffy.net
  • APRS: does pre-emphasis make much difference – owenduffy.net
  • APRS: how popular are Kenwood trackers – owenduffy.net
  • APRS: popularity of iGate system software – owenduffy.net
  • Paccomm Tiny-2 MK-II TNC review – owenduffy.net
  • A compact 3 element Yagi for 2m – owenduffy.net
  • Is the W5VJB J dipole novel – owenduffy.net
  • A response to VK3HZ’s comment on amateur licence trends – owenduffy.net
  • Australian amateur population trends 1998 – 2014 – owenduffy.net
  • The mobile APRS W2 digi left town this morning – owenduffy.net
  • Argent Data T3-135 review – owenduffy.net
  • Open squelch data carrier detect for TNC-2 – owenduffy.net
  • Foxtrak review – owenduffy.net
  • Interoperability of FoxTrak tracker and Argent Data’s OT3 – Part 1 – owenduffy.net
  • Interoperability of FoxTrak tracker and Argent Data’s OT3 – Part 2 – owenduffy.net
  • TinyTrak3 v1.42 review – owenduffy.net
  • Are inline RF wattmeters really averaging – owenduffy.net
  • Earth continuity testing of amateur equipment – owenduffy.net
  • Revision of FoxDelta null modem adapter – owenduffy.net
  • Adjusting Foxtrak tx audio using an SSB/FM receiver exploiting Bessel zeros to calibrate the modulator – owenduffy.net
  • Review of Ceramica ceramic bearing fans – owenduffy.net
  • Estimating near field strength with small antennas – owenduffy.net
  • Ground effects on small transmitting loop efficiency – owenduffy.net
  • Small transmitting loops and EMR safety – owenduffy.net
  • Equivalent circuit of small transmitting loop with auxiliary loop feed – owenduffy.net
  • Small transmitting loop – gamma match – owenduffy.net
  • Additional loss due to VSWR – a quite flawed concept – owenduffy.net
  • Small transmitting loop – linear circuit analysis – owenduffy.net
  • Small transmitting loop – NEC-4 analysis – owenduffy.net
  • ESC oscillator accuracy – Silabs internal oscillator – owenduffy.net
  • Using Ohms law on antenna baluns – owenduffy.net
  • Trying to make sense of the VE7BQH Yagi performance tables – owenduffy.net
  • PIK and auto-space – owenduffy.net
  • High performance 144MHz transverter design workup – noise and gain analysis – owenduffy.net
  • SimonK ESC FW – test of commit 1f75da – #4 – owenduffy.net
  • Update for NFM software (v1.18.0) – owenduffy.net
  • G5RV woes – W6OGC – owenduffy.net
  • BLHeli v11.0 on APM X450 quad – owenduffy.net
  • February 2014 – Page 3 – owenduffy.net
  • Foundation manual on power measurement – owenduffy.net
  • SimonK ESC FW – test of commit 8873df24 – #3 – owenduffy.net
  • SimonK ESC FW – test of commit 8873df24 – #2 – owenduffy.net
  • Do SWR meters make you stupid – owenduffy.net
  • Tricopter build – 20140201 – owenduffy.net
  • owenduffy.net – Page 86 – Mostly electronics…
  • Owen – Page 3 – owenduffy.net
  • Owen – Page 87 – owenduffy.net
  • Search Results for “end fed half wave” – Page 3 – owenduffy.net
  • Hobbyking X900 tricopter wrapup – owenduffy.net
  • Amateur Radio – Page 4 – owenduffy.net
  • Windowed ladder line loss – G3TXQ #2 – owenduffy.net
  • 3030 antenna – owenduffy.net
  • Amateur Radio – Page 60 – owenduffy.net
  • Antennas – Page 4 – owenduffy.net
  • Antennas – Page 35 – owenduffy.net
  • APRS – Page 4 – owenduffy.net
  • APRS – Page 6 – owenduffy.net
  • Baluns – Page 4 – owenduffy.net
  • Baluns – Page 5 – owenduffy.net
  • Electronics – Page 4 – owenduffy.net
  • Electronics – Page 17 – owenduffy.net
  • Maker – Page 4 – owenduffy.net
  • Maker – Page 10 – owenduffy.net
  • RC models – Page 4 – owenduffy.net
  • Tricopter build – 20140204 – owenduffy.net
  • RC models – Page 5 – owenduffy.net
  • Small Transmitting Loops – Page 4 – owenduffy.net
  • Small Transmitting Loops – Page 6 – owenduffy.net
  • Test equipment – Page 4 – owenduffy.net
  • Test equipment – Page 14 – owenduffy.net
  • Transmission lines – Page 4 – owenduffy.net
  • Transmission lines – Page 21 – owenduffy.net
  • Transmitters – Page 4 – owenduffy.net
  • Transmitters – Page 13 – owenduffy.net
  • owenduffy.net – Page 5 – Mostly electronics…
  • ?s=collinear&feed=rss2
  • owenduffy.net – Page 85 – Mostly electronics…
  • Owen – Page 4 – owenduffy.net
  • Owen – Page 86 – owenduffy.net
  • Amateur Radio – Page 5 – owenduffy.net
  • Amateur Radio – Page 59 – owenduffy.net
  • Antennas – Page 5 – owenduffy.net
  • Antennas – Page 34 – owenduffy.net
  • APRS – Page 5 – owenduffy.net
  • Electronics – Page 5 – owenduffy.net
  • Electronics – Page 16 – owenduffy.net
  • Maker – Page 5 – owenduffy.net
  • Maker – Page 9 – owenduffy.net
  • Small Transmitting Loops – Page 5 – owenduffy.net
  • Test equipment – Page 5 – owenduffy.net
  • Test equipment – Page 13 – owenduffy.net
  • Transmission lines – Page 5 – owenduffy.net
  • Transmission lines – Page 20 – owenduffy.net
  • Transmitters – Page 5 – owenduffy.net
  • Transmitters – Page 12 – owenduffy.net
  • owenduffy.net – Page 6 – Mostly electronics…
  • owenduffy.net – Page 84 – Mostly electronics…
  • Owen – Page 5 – owenduffy.net
  • Owen – Page 85 – owenduffy.net
  • Amateur Radio – Page 6 – owenduffy.net
  • Amateur Radio – Page 58 – owenduffy.net
  • Antennas – Page 6 – owenduffy.net
  • Antennas – Page 33 – owenduffy.net
  • Electronics – Page 6 – owenduffy.net
  • Electronics – Page 15 – owenduffy.net
  • Maker – Page 6 – owenduffy.net
  • Maker – Page 8 – owenduffy.net
  • Test equipment – Page 6 – owenduffy.net
  • Test equipment – Page 12 – owenduffy.net
  • Transmission lines – Page 6 – owenduffy.net
  • Transmission lines – Page 19 – owenduffy.net
  • Transmitters – Page 6 – owenduffy.net
  • Transmitters – Page 11 – owenduffy.net
  • owenduffy.net – Page 7 – Mostly electronics…
  • owenduffy.net – Page 83 – Mostly electronics…
  • Owen – Page 6 – owenduffy.net
  • Owen – Page 84 – owenduffy.net
  • Amateur Radio – Page 7 – owenduffy.net
  • Amateur Radio – Page 57 – owenduffy.net
  • Antennas – Page 7 – owenduffy.net
  • Antennas – Page 32 – owenduffy.net
  • Electronics – Page 7 – owenduffy.net
  • Electronics – Page 14 – owenduffy.net
  • Maker – Page 7 – owenduffy.net
  • Test equipment – Page 7 – owenduffy.net
  • Test equipment – Page 11 – owenduffy.net
  • Transmission lines – Page 7 – owenduffy.net
  • Transmission lines – Page 18 – owenduffy.net
  • Transmitters – Page 7 – owenduffy.net
  • Transmitters – Page 10 – owenduffy.net
  • owenduffy.net – Page 8 – Mostly electronics…
  • owenduffy.net – Page 82 – Mostly electronics…
  • Owen – Page 7 – owenduffy.net
  • Owen – Page 83 – owenduffy.net
  • Amateur Radio – Page 8 – owenduffy.net
  • Amateur Radio – Page 56 – owenduffy.net
  • Antennas – Page 8 – owenduffy.net
  • Antennas – Page 31 – owenduffy.net
  • Electronics – Page 8 – owenduffy.net
  • Electronics – Page 13 – owenduffy.net
  • Test equipment – Page 8 – owenduffy.net
  • Test equipment – Page 10 – owenduffy.net
  • Transmission lines – Page 8 – owenduffy.net
  • Transmission lines – Page 17 – owenduffy.net
  • Transmitters – Page 8 – owenduffy.net
  • Transmitters – Page 9 – owenduffy.net
  • owenduffy.net – Page 9 – Mostly electronics…
  • owenduffy.net – Page 81 – Mostly electronics…
  • Owen – Page 8 – owenduffy.net
  • Owen – Page 82 – owenduffy.net
  • Amateur Radio – Page 9 – owenduffy.net
  • Amateur Radio – Page 55 – owenduffy.net
  • Antennas – Page 9 – owenduffy.net
  • Antennas – Page 30 – owenduffy.net
  • Electronics – Page 9 – owenduffy.net
  • Electronics – Page 12 – owenduffy.net
  • Test equipment – Page 9 – owenduffy.net
  • Transmission lines – Page 9 – owenduffy.net
  • Transmission lines – Page 16 – owenduffy.net
  • owenduffy.net – Page 10 – Mostly electronics…
  • owenduffy.net – Page 80 – Mostly electronics…
  • Owen – Page 9 – owenduffy.net
  • Owen – Page 81 – owenduffy.net
  • Amateur Radio – Page 10 – owenduffy.net
  • Amateur Radio – Page 54 – owenduffy.net
  • Antennas – Page 10 – owenduffy.net
  • Antennas – Page 29 – owenduffy.net
  • Electronics – Page 10 – owenduffy.net
  • Electronics – Page 11 – owenduffy.net
  • Transmission lines – Page 10 – owenduffy.net
  • Transmission lines – Page 15 – owenduffy.net
  • owenduffy.net – Page 11 – Mostly electronics…
  • owenduffy.net – Page 79 – Mostly electronics…
  • Owen – Page 10 – owenduffy.net
  • Owen – Page 80 – owenduffy.net
  • Amateur Radio – Page 11 – owenduffy.net
  • Amateur Radio – Page 53 – owenduffy.net
  • Antennas – Page 11 – owenduffy.net
  • Antennas – Page 28 – owenduffy.net
  • Transmission lines – Page 11 – owenduffy.net
  • Transmission lines – Page 14 – owenduffy.net
  • owenduffy.net – Page 12 – Mostly electronics…
  • owenduffy.net – Page 78 – Mostly electronics…
  • Owen – Page 11 – owenduffy.net
  • Owen – Page 79 – owenduffy.net
  • Amateur Radio – Page 12 – owenduffy.net
  • Amateur Radio – Page 52 – owenduffy.net
  • Antennas – Page 12 – owenduffy.net
  • Antennas – Page 27 – owenduffy.net
  • Transmission lines – Page 12 – owenduffy.net
  • Transmission lines – Page 13 – owenduffy.net
  • owenduffy.net – Page 13 – Mostly electronics…
  • owenduffy.net – Page 77 – Mostly electronics…
  • Owen – Page 12 – owenduffy.net
  • Owen – Page 78 – owenduffy.net
  • Amateur Radio – Page 13 – owenduffy.net
  • Amateur Radio – Page 51 – owenduffy.net
  • Antennas – Page 13 – owenduffy.net
  • Antennas – Page 26 – owenduffy.net
  • owenduffy.net – Page 14 – Mostly electronics…
  • owenduffy.net – Page 76 – Mostly electronics…
  • Owen – Page 13 – owenduffy.net
  • Owen – Page 77 – owenduffy.net
  • Amateur Radio – Page 14 – owenduffy.net
  • Amateur Radio – Page 50 – owenduffy.net
  • Antennas – Page 14 – owenduffy.net
  • Antennas – Page 25 – owenduffy.net
  • owenduffy.net – Page 15 – Mostly electronics…
  • owenduffy.net – Page 75 – Mostly electronics…
  • Owen – Page 14 – owenduffy.net
  • Owen – Page 76 – owenduffy.net
  • Amateur Radio – Page 15 – owenduffy.net
  • Amateur Radio – Page 49 – owenduffy.net
  • Antennas – Page 15 – owenduffy.net
  • Antennas – Page 24 – owenduffy.net
  • owenduffy.net – Page 16 – Mostly electronics…
  • owenduffy.net – Page 74 – Mostly electronics…
  • Owen – Page 15 – owenduffy.net
  • Owen – Page 75 – owenduffy.net
  • Amateur Radio – Page 16 – owenduffy.net
  • Amateur Radio – Page 48 – owenduffy.net
  • Antennas – Page 16 – owenduffy.net
  • Antennas – Page 23 – owenduffy.net
  • owenduffy.net – Page 17 – Mostly electronics…
  • owenduffy.net – Page 73 – Mostly electronics…
  • Owen – Page 16 – owenduffy.net
  • Owen – Page 74 – owenduffy.net
  • Amateur Radio – Page 17 – owenduffy.net
  • Amateur Radio – Page 47 – owenduffy.net
  • Antennas – Page 17 – owenduffy.net
  • Antennas – Page 22 – owenduffy.net
  • owenduffy.net – Page 18 – Mostly electronics…
  • owenduffy.net – Page 72 – Mostly electronics…
  • Owen – Page 17 – owenduffy.net
  • Owen – Page 73 – owenduffy.net
  • Amateur Radio – Page 18 – owenduffy.net
  • Amateur Radio – Page 46 – owenduffy.net
  • Antennas – Page 18 – owenduffy.net
  • Antennas – Page 21 – owenduffy.net
  • owenduffy.net – Page 19 – Mostly electronics…
  • owenduffy.net – Page 71 – Mostly electronics…
  • Owen – Page 18 – owenduffy.net
  • Owen – Page 72 – owenduffy.net
  • Amateur Radio – Page 19 – owenduffy.net
  • Amateur Radio – Page 45 – owenduffy.net
  • Antennas – Page 19 – owenduffy.net
  • Antennas – Page 20 – owenduffy.net
  • owenduffy.net – Page 20 – Mostly electronics…
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  • Review of Dodd’s WSPR based antenna comparison – owenduffy.net
  • Should you use MIC-E compression in your APRS tracker – owenduffy.net
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  • COMP_PWM and SimonK ESC firmware – owenduffy.net
  • August 2018 – Page 2 – owenduffy.net
  • Measurement – Page 5 – owenduffy.net
  • Transmission lines – Page 24 – owenduffy.net
  • Shack entry / ATU configuration for my G5RV with tuned feeder – owenduffy.net
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  • Test equipment – Page 17 – owenduffy.net
  • Small Transmitting Loops – Page 3 – owenduffy.net
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