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Homepage Last updated: 2018, May 18
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April 2016 – Page 2 – owenduffy.net
CH340, CH341 USB to RS-232 chip compatibility – owenduffy.net
Some thoughts on a two turn small transmitting loop – owenduffy.net
Accuracy of estimation of radiation resistance of small transmitting loops – owenduffy.net
Ultrafire XML-T6 LED torch – a fix for the dysfunctional mode memory ‘feature’ – owenduffy.net
End fed Zepp – owenduffy.net
Fridge / freezer setup – owenduffy.net
A tutorial on initial design of operating conditions for a valve amplifier – owenduffy.net
Thinking about SOTA, EFHW and EMR safety – owenduffy.net
SPICE model of Zcm of a Guanella 9:1 current balun – owenduffy.net
Why the preference for Guanella 1:1 current baluns for HF wire antennas – owenduffy.net
Quiet solar radio flux interpolations calculator – owenduffy.net
Ultrafire XML-T6 torch review – owenduffy.net
March 2016 – Page 2 – owenduffy.net
ATU efficiency – owenduffy.net
RG-6/U for lower HF – owenduffy.net
Elitech RC-4 logging thermometer – owenduffy.net
KL7AJ quick quiz 21/02/2016 – owenduffy.net
Measuring common mode choke Zcm using a two port VNA – owenduffy.net
Review of N6PAA’s 40m STL – owenduffy.net
Review of KK5JY’s 40m STL – owenduffy.net
Design / build project: Guanella 1:1 ‘tuner balun’ for HF – #1 – owenduffy.net
Design / build project: Guanella 1:1 ‘tuner balun’ for HF – #2 – owenduffy.net
Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #3 – owenduffy.net
Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #5 – owenduffy.net
Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #6 – owenduffy.net
Low power Guanella 1:1 tuner balun using a pair of Jaycar LF1260 suppression sleeves – owenduffy.net
February 2016 – Page 2 – owenduffy.net
February 2016 – Page 3 – owenduffy.net
Low noise Yagis and 50MHz noise – owenduffy.net
Some thoughts on noise on 6m (50MHz)… – owenduffy.net
A low cost home made USB CI-V interface with open collector and solid Windows drivers – owenduffy.net
Voltage and current on a transmission line with standing waves – owenduffy.net
Feeding at a current maximum – owenduffy.net
Graphic demonstration of loss under standing waves #3 – owenduffy.net
Graphic demonstration of loss under standing waves – owenduffy.net
VSWR expressed as 1:n – owenduffy.net
Expression of VSWR as a simple decimal real number – owenduffy.net
January 2016 – Page 2 – owenduffy.net
January 2016 – Page 3 – 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 #7 – owenduffy.net
Exploiting your antenna analyser #6 – owenduffy.net
Exploiting your antenna analyser #5 – owenduffy.net
Measuring matched line loss – 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
Reconciling W5QJR’s loop formulas – 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
Adjusting KISS TNC AFSK tx level using an 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
Some tools for designing a Guanella 1:1 balun using ferrite toroids – 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
End fed matching – PA3HHO design review – owenduffy.net
End fed matching – design review – 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
An A/B comparison of a low G5RV with a MobileOne M40-1 – owenduffy.net
NEC-4 vs NEC-2 on a low small transmitting loop – owenduffy.net
Small transmitting loop – ground loss relationship to radiation resistance – 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
Definition: Current Balun, Voltage Balun – 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
Loss of Wireman 553 windowed ladder line at MF/HF – owenduffy.net
Diamond X50N measurements – AIMuhf and AA-600 – owenduffy.net
Diamond X-50N #2 at VK2OMD – owenduffy.net
AIMuhf – my strategy – 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
A SPICE model for a Ruthroff 4:1 balun. – 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
Should you use MIC-E compression in your APRS tracker – owenduffy.net
Open squelch data carrier detect for Flash Packet Radio Control Board (VK6) – owenduffy.net
MFJ-1270B TNC review – owenduffy.net
The extent to which APRS works is often an accident – owenduffy.net
August 2014 – Page 2 – owenduffy.net
August 2014 – Page 3 – owenduffy.net
Adjusting AFSK FM tx level using a PC oscilloscope – owenduffy.net
AX.25 1200Bd AFSK FM – to pre-emphasise or not – owenduffy.net
Diagnosis of APRS reception problem – owenduffy.net
APRS call sign corruption at iGate – owenduffy.net
Audio level setup on TNC-X (MFJ-1270X) – owenduffy.net
Are you getting the best performance from your FM AFSK APRS transmitter – owenduffy.net
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
Common mode current and coaxial feed lines – 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
COMP_PWM and SimonK ESC firmware – 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…
Owen – Page 2 – owenduffy.net
Owen – Page 88 – owenduffy.net
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
A tale of three tuners – owenduffy.net
HC-500 – 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
Chinese 18650 Li-ion cells – Ultrafire capacity test – owenduffy.net
The future of APRS is here… – owenduffy.net
Lithium battery – 1S protection boards – owenduffy.net
A little rigging this week (20160204) – owenduffy.net
Panasonic NCR18650B Lithium Ion cells on eBay – 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
Fox flasher MkII #2 – 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
An inexpensive medium power tuner current balun for HF using Jaycar parts – owenduffy.net
WIA 4:1 current balun – further explanation – owenduffy.net
WIA 4:1 current balun – 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
End fed half wave – NEC models for 20m – owenduffy.net
Expected ambient noise – in practice – owenduffy.net
Identifying ferrite materials #2 – owenduffy.net
Updated: Calculate initial load line of valve RF amplifier – 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
HK DT750 motor, Afro30 ESC and SimonK 8c2cf42/comp_pwm – owenduffy.net
ESC ceramic resonator accuracy – owenduffy.net
RC models – Page 6 – owenduffy.net
Expected ambient noise – owenduffy.net
Reconciling my #52 choke design tool with G3TXQ’s measurements – owenduffy.net
Update for FSM software (v1.11.0) – 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
Small Transmitting Loops – Page 3 – 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 loop review – 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
BN-43-2402 balun example – 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
Speaker cable as RF transmission line – owenduffy.net
Transmission lines – Page 22 – owenduffy.net
TNC-X – channel access behaviour – 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
On Witt’s calculation of Matched Line Loss from Return Loss – 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
Comparison of two small transmitting loops – 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 #13 – owenduffy.net
Exploiting your antenna analyser #2 – owenduffy.net
Exploiting your antenna analyser #1 – 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
Balanced ATUs and common mode current – 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
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
A generic run on timer using an ATTINY25 – owenduffy.net
A look at internal losses in a typical ATU – owenduffy.net
Low Insertion VSWR HF Guanella 1:1 balun for instrumentation – owenduffy.net
Identifying ferrite materials – owenduffy.net
RC PWM – ON/OFF switch – owenduffy.net
Revised thinking on STC chips – owenduffy.net
Making sense of LED output figures – owenduffy.net
Precision GPS experiment #1 – owenduffy.net
Search Results for “end fed half wave” – owenduffy.net
High altitude balloon – 2014-02-08 – owenduffy.net
End fed matching – PA3HHO design review #2 – owenduffy.net
ATU voltage verification – owenduffy.net
Review of Trask’s 1:1 current balun – owenduffy.net
Feeding at a current maximum, and three other options – owenduffy.net
VSWR=1 and X≠0 – owenduffy.net
Win 10 Threshold 2 issues – owenduffy.net
18650 Lithium Ion cells on eBay – owenduffy.net
ANS T1.523-2001, Telecom Glossary 2000 and Return Loss – owenduffy.net
On negative VSWR – owenduffy.net
Can the magnitude of the complex reflection coefficient (ρ) be greater than 1 – owenduffy.net
Quiet solar radio flux interpolations calculator – owenduffy.net
Search Results for “qsrf” – owenduffy.net
NEC model of the quarter size G5RV – owenduffy.net
WSPR version confusion – owenduffy.net
Evolution of WSPR – 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
A method for initial ground loss estimates for an STL – 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
Differential and common mode components of current in a two wire transmission line – 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
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
Hobbyking X900 tricopter wrapup – 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…
Search Results for “end fed half wave” – Page 2 – owenduffy.net
Search Results for “end fed half wave” – Page 4 – owenduffy.net
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…
Search Results for “end fed half wave” – Page 3 – owenduffy.net
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…
owenduffy.net – Page 70 – Mostly electronics…
Owen – Page 19 – owenduffy.net
Owen – Page 71 – owenduffy.net
Amateur Radio – Page 20 – owenduffy.net
Amateur Radio – Page 44 – owenduffy.net
owenduffy.net – Page 21 – Mostly electronics…
owenduffy.net – Page 69 – Mostly electronics…
Owen – Page 20 – owenduffy.net
Owen – Page 70 – owenduffy.net
Amateur Radio – Page 21 – owenduffy.net
Amateur Radio – Page 43 – owenduffy.net
owenduffy.net – Page 22 – Mostly electronics…
owenduffy.net – Page 68 – Mostly electronics…
Owen – Page 21 – owenduffy.net
Owen – Page 69 – owenduffy.net
Amateur Radio – Page 22 – owenduffy.net
Amateur Radio – Page 42 – owenduffy.net
owenduffy.net – Page 23 – Mostly electronics…
owenduffy.net – Page 67 – Mostly electronics…
Owen – Page 22 – owenduffy.net
Owen – Page 68 – owenduffy.net
Amateur Radio – Page 23 – owenduffy.net
Amateur Radio – Page 41 – owenduffy.net
owenduffy.net – Page 24 – Mostly electronics…
owenduffy.net – Page 66 – Mostly electronics…
Owen – Page 23 – owenduffy.net
Owen – Page 67 – owenduffy.net
Amateur Radio – Page 24 – owenduffy.net
Amateur Radio – Page 40 – owenduffy.net
owenduffy.net – Page 25 – Mostly electronics…
owenduffy.net – Page 65 – Mostly electronics…
Owen – Page 24 – owenduffy.net
Owen – Page 66 – owenduffy.net
Amateur Radio – Page 25 – owenduffy.net
Amateur Radio – Page 39 – owenduffy.net
owenduffy.net – Page 26 – Mostly electronics…
owenduffy.net – Page 64 – Mostly electronics…
Owen – Page 25 – owenduffy.net
Owen – Page 65 – owenduffy.net
Amateur Radio – Page 26 – owenduffy.net
Amateur Radio – Page 38 – owenduffy.net
owenduffy.net – Page 27 – Mostly electronics…
owenduffy.net – Page 63 – Mostly electronics…
Owen – Page 26 – owenduffy.net
Owen – Page 64 – owenduffy.net
Amateur Radio – Page 27 – owenduffy.net
Amateur Radio – Page 37 – owenduffy.net
owenduffy.net – Page 28 – Mostly electronics…
owenduffy.net – Page 62 – Mostly electronics…
Owen – Page 27 – owenduffy.net
Owen – Page 63 – owenduffy.net
Amateur Radio – Page 28 – owenduffy.net
Amateur Radio – Page 36 – owenduffy.net
owenduffy.net – Page 29 – Mostly electronics…
owenduffy.net – Page 61 – Mostly electronics…
Owen – Page 28 – owenduffy.net
Owen – Page 62 – owenduffy.net
Amateur Radio – Page 29 – owenduffy.net
Amateur Radio – Page 35 – owenduffy.net
owenduffy.net – Page 30 – Mostly electronics…
owenduffy.net – Page 60 – Mostly electronics…
Owen – Page 29 – owenduffy.net
Owen – Page 61 – owenduffy.net
Amateur Radio – Page 30 – owenduffy.net
Amateur Radio – Page 34 – owenduffy.net
owenduffy.net – Page 31 – Mostly electronics…
owenduffy.net – Page 59 – Mostly electronics…
Owen – Page 30 – owenduffy.net
Owen – Page 60 – owenduffy.net
Amateur Radio – Page 31 – owenduffy.net
Amateur Radio – Page 33 – owenduffy.net
owenduffy.net – Page 32 – Mostly electronics…
owenduffy.net – Page 58 – Mostly electronics…
Owen – Page 31 – owenduffy.net
Owen – Page 59 – owenduffy.net
Amateur Radio – Page 32 – owenduffy.net
owenduffy.net – Page 33 – Mostly electronics…
owenduffy.net – Page 57 – Mostly electronics…
Owen – Page 32 – owenduffy.net
Owen – Page 58 – owenduffy.net
owenduffy.net – Page 34 – Mostly electronics…
owenduffy.net – Page 56 – Mostly electronics…
Owen – Page 33 – owenduffy.net
Owen – Page 57 – owenduffy.net
owenduffy.net – Page 35 – Mostly electronics…
owenduffy.net – Page 55 – Mostly electronics…
Owen – Page 34 – owenduffy.net
Owen – Page 56 – owenduffy.net
owenduffy.net – Page 36 – Mostly electronics…
owenduffy.net – Page 54 – Mostly electronics…
Owen – Page 35 – owenduffy.net
Owen – Page 55 – owenduffy.net
owenduffy.net – Page 37 – Mostly electronics…
owenduffy.net – Page 53 – Mostly electronics…
Owen – Page 36 – owenduffy.net
Owen – Page 54 – owenduffy.net
owenduffy.net – Page 38 – Mostly electronics…
owenduffy.net – Page 52 – Mostly electronics…
Owen – Page 37 – owenduffy.net
Owen – Page 53 – owenduffy.net
owenduffy.net – Page 39 – Mostly electronics…
owenduffy.net – Page 51 – Mostly electronics…
Owen – Page 38 – owenduffy.net
Owen – Page 52 – owenduffy.net
owenduffy.net – Page 40 – Mostly electronics…
owenduffy.net – Page 50 – Mostly electronics…
Owen – Page 39 – owenduffy.net
Owen – Page 51 – owenduffy.net
owenduffy.net – Page 41 – Mostly electronics…
owenduffy.net – Page 49 – Mostly electronics…
Owen – Page 40 – owenduffy.net
Owen – Page 50 – owenduffy.net
owenduffy.net – Page 42 – Mostly electronics…
owenduffy.net – Page 48 – Mostly electronics…
Owen – Page 41 – owenduffy.net
Owen – Page 49 – owenduffy.net
owenduffy.net – Page 43 – Mostly electronics…
owenduffy.net – Page 47 – Mostly electronics…
Owen – Page 42 – owenduffy.net
Owen – Page 48 – owenduffy.net
owenduffy.net – Page 44 – Mostly electronics…
owenduffy.net – Page 46 – Mostly electronics…
Owen – Page 43 – owenduffy.net
Owen – Page 47 – owenduffy.net
owenduffy.net – Page 45 – Mostly electronics…
Owen – Page 44 – owenduffy.net
Owen – Page 46 – owenduffy.net
Owen – Page 45 – owenduffy.net
         
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wlwmanifest.xml
         
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2014
                        
051 page
VSWRCurveDerivation.pdf
                        
101 page
VHF-APRS-traffic-study-VK2OMD-3-11_10_2014-.pdf
                   
2015
                        
021 page
VHF-APRS-traffic-study-VK2OMD-3-08_02_2015-.pdf
    
calc46 pages
Noise measurement uncertainty calculator
Field strength / receive power converter
Receiver sensitivity / noise figure / noise factor / noise floor converter
Noise Figure Y factor method calculator
Calculator to support Manual Testing of Field-Strength Levels Using Conventional Receivers
Ambient noise calculator
Antenna Factor of short tuned vertical with concentrated loading
SG / Brix / Plato / Baume calculator
Characteristic impedance of transmission line of two square conductors in air
RX1, RX2 Noise bridge calculator
Generic noise bridge calculator
Calculate initial load line of valve RF amplifier
Calculate RF amplifier pi coupler
Measuring RF impedance by the three voltmeter method
Convert Vpk-Vpp-Vrms-dBV-dBu-mW-dBm
Calculate braid coverage
T Match efficiency estimator
Calculate ferrite cored inductor - rectangular cross section
Calculate ferrite cored inductor - circular cross section
Calculate ferrite cored inductor (from Al)
Skin depth calculator
Student's t test calculator
Factorise integer
Convert Antenna Factor and Gain
Folded dipole step up ratio calculator
Calculate small loop Antenna Factor
Calculate small transmitting loop gain from bandwidth measurement
Calculate Antenna Q from VSWR bandwidth measurement
Calculate VSWR and Return Loss from Zload and Zo
Calculate VSWR and Return Loss from Zload (or Yload or S11) and Zo
Find R,|X| from VSWR,|Z|,Ro
Calculate cooking time for soft boiled egg
Two point thermistor calibration
Wire DC resistance calculator
Calculate efficiency of vertically polarised antenna from far field strength
Calculate Vmax, Vmin, Imax, Imin for lossless line from Zload (or Yload) and Zo
Calculate transmission line Matched Line Loss from Rin of o/c or s/c resonant section
Calculate luminous flux (lm) from luminous intensity (cd) and apex angle (°)
Find |Z|,R,|X| from VSWR,|Z|,R,X,Ro
Estimate Matched Line Loss from paired VSWR measurements
Calculate length of helix of round wire
Velocity factor solver
RTD tolerance calculator
Calculate shunt / beta / hairpin match
Measuring impedance using an oscilloscope
ITU P.372-13 Figure 10
         
qsrf2 pages
Quiet sun radio flux interpolations
Quiet sun radio flux interpolations
         
awcc1 page
Antenna wire catenary calculator
         
tl14 pages
VSWR calculator
Calculate Vpk and Irms for given power at complex load
RF Transmission Line Loss Calculator
RF Two Wire Transmission Line Loss Calculator
RF Arbitrary Transmission Line Loss Calculator
RF Coaxial Transmission Line Loss Calculator
RF Round Wire Inductance Calculator
ATLLC Examples
vswr.pdf
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Theme page: Broadband over Power Lines
Theme page: Broadband over Power Lines
An introduction to Broadband over Power Lines
Are you ready for BPL enablement of your home and neighbourhood?
ManagementOfInterferenceFromBpl-OwenDuffy.pdf
Observations of ambient noise / emissions at Jerrabomberra - April 2007
Hobart BPL Trial -  11-12 January 2007
Country Energy BPL Trial Oct - Febuary 2004
Woomera BPL Trial Oct - Dec 2004
Queanbeyan BPL Trial Mar 2005
Queanbeyan BPL Trial Nov 2004
Ionospheric propagation of BPL emissions
How much radiated power does it take to create an S9 signal?
Comparison of the proposed CENELEC standard and existing US FCC 15.209 on HF Amateur Bands
Jerrabomberra-20070404-FSMData.xls
    
audio
         
TS2000
              
2008051 page
TS2000 audio setup - May 2008
              
2008061 page
TS2000 audio setup - June 2008
         
legend1 page
Legendary microphones for ham radio
    
FM3 pages
Setup of FM tx for broadcast relay from a digital audio source
Amateur Radio application of Frequency Modulation
Passive Direct Inject Box
         
afskoverload1 page
AFSK - effect of overload of tx audio input
         
LinkedRepeaters1 page
Linked repeaters - siqnal quality
         
VhfAprs1 page
APRS AFSK on VHF
         
AfskFmSetup1 page
Setup of an FM AFSK transmitter
    
files5 pages
ATC.pdf
AmateurRadioLog.pdf
NoiseMeasurementUncertainty.pdf
EstimateZFerriteToroidInductor.pdf
AvoidingFlashoverInBalunsAndAtus.pdf
    
module
         
137700Osc 2 pages
137.7kHz oscillator
137700.hex
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