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Homepage Last updated: 2016, December 9
Total pages: 2085

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owenduffy.net index
Digital document signatures
Disclaimer
    
grabber2 pages
QRSS grabber @ VK2OMD
Grabber case studies
         
ISP
              
graph7 pages
Index of /grabber/ISP/graph
Index of /grabber/ISP/graph
Index of /grabber/ISP/graph
Index of /grabber/ISP/graph
Index of /grabber/ISP/graph
Index of /grabber/ISP/graph
Index of /grabber/ISP/graph
         
capture7 pages
Index of /grabber/capture
Index of /grabber/capture
Index of /grabber/capture
Index of /grabber/capture
Index of /grabber/capture
Index of /grabber/capture
Index of /grabber/capture
         
cs011 page
An A/B comparison on 40m over a 14,700km path using QRSS
         
cs021 page
An A/B comparison on 40m over a 17,000km path using QRSS
         
cs031 page
A comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
         
cs041 page
A comparison of a 40m quarter wave verticals with elevated radials and horizontal dipole over a 14,700km path using QRSS
         
cs051 page
Distribution of S/N ratio under fading on HF
         
cs061 page
Another comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
         
cs071 page
Yet another comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
         
cs081 page
VK1KW QRSS beacon on 2m 15/01/13
         
SLCapture1 page
Capturing QRSS3 with Spectrum Lab
         
cs101 page
A comparison of a G5RV at VK1OD and QW vertical at VK2DVK on 40m over a 14,700km path using QRSS
    
rc1 page
Theme page: Radio control model technology
         
BLDC1 page
Sensorless brushless DC motor - an explanation
         
Motors
              
T2211-23001 page
Turnigy 2211-2300 brushless DC motor
              
T2730-15001 page
Turnigy 2730-1500 brushless DC motor
         
ESC
              
Afro301 page
Afro30 30A ESC
              
BS121 page
Blue series 12A ESC
              
BS201 page
Blue series 20A ESC
              
HK2610000011 page
Hobbyking 261000001 ESC - flashing alternate firmware
              
HK2610000021 page
Hobbyking 261000002 ESC - flashing alternate firmware
              
F20A1 page
Hobbyking F-20A 20A ESC
              
F30A1 page
Hobbyking F-30A 30A ESC
              
F40A1 page
Hobbyking F-40A 40A ESC
              
RB70A1 page
HobbyKing Red Brick 70A ESC (Opto)
              
92610000031 page
Hobbyking 9261000003 40A ESC
              
Rctimer20A1 page
Rctimer 20A ESC
              
SBEC-26V1 page
Turnigy 5A 26V SBEC (SBEC-26V)
              
Multistar101 page
Turnigy Multistar 10A ESC
              
ZtwA121 page
ZTW A series 12A ESC
         
EscProgrammingCard1 page
ESC programming cards
         
aircraft
              
X2301 page
X230 quadcopter
              
F330-012 pages
F330 quadcopter (10/11/2013 build)
WinMerge File Compare Report
              
F330-021 page
F330 quadcopter (1/12/2013 build)
              
SK450-012 pages
SK450 quadcopter (10/11/2013 build)
WinMerge File Compare Report
              
X450-011 page
X450-01 quadcopter (10/11/2013 build)
              
X900-012 pages
X900 tricopter (20/01/2014 build)
WinMerge File Compare Report
              
F330-031 page
F330 quadcopter (25/04/2014 build)
              
X450-021 page
X450-02 quadcopter (21/05/2014 build)
              
Q450-012 pages
Q450 quadcopter (15/03/2015 build)
diff report
              
Q450-021 page
Q450 quadcopter (15/10/2015 build)
              
Q450-031 page
Q450 quadcopter - Q21 (15/12/2015 build)
              
X450-031 page
X450-03 quadcopter - Q11 (19/03/2015 build)
              
Q450-Q211 page
Q450 quadcopter - Q22 (30/06/2016 build)
              
Q450-Q221 page
Q450 quadcopter (30/06/2016 build)
         
Programming
              
HkUsbasp1 page
Hobbyking USBasp AVR programmer
         
accessories
              
asrg1 page
Arduino servo ramp generator
         
tools1 page
Calculate SimonK BLDC timing parameters
    
traffic8 pages
Telephony Traffic
Erlang B traffic model
Erlang C queue model
Poisson traffic model
Binomial traffic model
Traffic unit converter
Telephony Traffic
Erlang C FAQ
    
software1 page
Theme page: Calculators, Software
         
nfm6 pages
NFM Home Page
NFM Support
NFM FAQ
NFM Registration
NFM.pdf
NfmFunctions.xls
              
applications7 pages
NFM Applications
Plotting antenna pattern from Sun noise
Measuring system G/T ratio using Sun noise
Measuring TS2000 Noise Figure using NFM and RFD2305
2300AntennaPattern.xls
2300AntennaPatternE.xls
VK7MO-2302-GT.xls
         
fsm8 pages
FSM Home Page
FSM support page
FSM.pdf
FSM Receiver Tests
Accuracy of the FSM sampling process on noise
FSMKeyboardShortcuts.pdf
FSM FAQ
FSM Home Page
              
cs6 pages
FSM case study - Wideband interference on 40m
FSM case study - Ambient noise survey on 40m
20050628.xls
20050628212255.txt
NoiseSurveyFSMData.xls
20050628212255.grf
                   
032 pages
Ambient noise survey, Hackett ACT on 40m, 06/03/2009
FsmData.xls
                   
042 pages
Ambient noise survey, Bowral NSW on 40m, 13/08/2010
FsmData.xls
         
finddr2 pages
FINDDR
FINDDR
         
fsc4 pages
FSC support page
FSC Home Page
FSC FAQ
Using FSC to calculate EME paths
         
hp3 pages
Software for HP calculators
VSWR.hp
VSWR.txt
         
ATB2 pages
ATB - a bootloader for AVR Tiny microcontrollers
Prolific PL-2303 problems
    
recipe17 pages
Favourite Recipes
Shortcrust Pastry
Biscuit Pastry
Choux Pastry
Pasta - Basic
Plain Scones
Date Scones
Pizza Dough
White Bread
Lemonade Marmalade
Raghaven's masala
Homus
Basil pesto
Lemon Myrtle Couscous
Lemon Couscous
Balsamic sweet and sour dipping sauce / glaze
Tidbits
         
LemonadeMarmalade1 page
Lemonade Marmalade
         
FAQ2 pages
Endpoint to boiling a sugar solution
Recipe FAQ
         
misc1 page
Olive oil calibration of refractometer
    
smg
         
data3 pages
Site Map Page 1 - Generated by www.xml-sitemaps.com
Site Map Page 2 - Generated by www.xml-sitemaps.com
Site Map Page 3 - Generated by www.xml-sitemaps.com
    
blog 1725 pages
owenduffy.net – Mostly electronics…
The fine print – owenduffy.net
Amateur Radio – owenduffy.net
Antennas – owenduffy.net
Telecommunications – owenduffy.net
An example of Eb/N0 design with the Field strength / receive power converter – owenduffy.net
Owen – owenduffy.net
Exploitation of NEC’s GM card – owenduffy.net
Antenna Tuners (ATU) – owenduffy.net
The Army Loop (Patterson match) – owenduffy.net
APRS – owenduffy.net
Packet loss by digi collision – owenduffy.net
Another Argent Data T3 incompatibility – owenduffy.net
The KISS TNC – too simple, too stupid? – owenduffy.net
Chameleon CHA M-LOOP – owenduffy.net
RPi headless aprx server using soundmodem – owenduffy.net
Diamond X-50N #2 at VK2OMD – owenduffy.net
Test equipment – owenduffy.net
VK3AQZ RF power meter (RFPM1) – adjust Tx power example – owenduffy.net
VK3AQZ RF power meter (RFPM1) – owenduffy.net
owenduffy.net – Page 2 – Mostly electronics…
VK3AQZ RF power meter (RFPM1) – filter response example – 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
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
Are gamma matches as bad as all that – owenduffy.net
Where is the best place to measure feed point VSWR – owenduffy.net
The half waves of coax rule for measuring VSWR accurately – owenduffy.net
A response to VK3HZ’s comment on amateur licence trends – owenduffy.net
Australian amateur population trends 1998 – 2014 – 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
Why the preference for Guanella 1:1 current baluns for HF wire antennas – owenduffy.net
Adjusting KISS TNC AFSK tx level using an isochronous test packet – owenduffy.net
Galvanised steel wire CF dipole – owenduffy.net
OpenTracker USB review – owenduffy.net
aprx: evalution of viscous digi – owenduffy.net
Cron configuration improvements for Raspberry Pi – owenduffy.net
Real time clock for Raspberry Pi – owenduffy.net
APRS: how many digi hops to make it to APRS-IS – owenduffy.net
APRS traffic study – VK2OMD-3 11/10/2014 – owenduffy.net
Notes on my fork of aprx – owenduffy.net
APRS test drive – 20140930 – owenduffy.net
Synthetic fibre rope for antenna rigging – owenduffy.net
Headless aprx APRS server – RPi packages – owenduffy.net
End fed wires – another matching case study – owenduffy.net
Garmin GPS35 DE-9 (F) wiring – owenduffy.net
Headless aprx APRS server – owenduffy.net
Effect of ground on HF horizontal dipole efficiency – owenduffy.net
MFJ-1270B TNC alignment – owenduffy.net
Signalink USB PTT disable – owenduffy.net
Signalink USB noise floor improvement – owenduffy.net
The future of APRS is here… – owenduffy.net
Admin – owenduffy.net
Arduino – owenduffy.net
Baluns – owenduffy.net
Computing – owenduffy.net
Electrical – owenduffy.net
Electronics – owenduffy.net
Maker – owenduffy.net
RC models – owenduffy.net
Receivers – owenduffy.net
Transmission lines – owenduffy.net
Transmitters – owenduffy.net
Uncategorized – owenduffy.net
VK1OD projects – owenduffy.net
owenduffy.net – Page 24 – Mostly electronics…
December 2014 – owenduffy.net
November 2014 – owenduffy.net
October 2014 – owenduffy.net
September 2014 – owenduffy.net
August 2014 – owenduffy.net
July 2014 – owenduffy.net
June 2014 – owenduffy.net
May 2014 – owenduffy.net
April 2014 – owenduffy.net
March 2014 – owenduffy.net
February 2014 – owenduffy.net
January 2014 – owenduffy.net
December 2013 – owenduffy.net
Amateur Radio – Page 2 – owenduffy.net
Amateur Radio – Page 19 – owenduffy.net
Antennas – Page 2 – owenduffy.net
Antennas – Page 9 – owenduffy.net
Australia’s NBN debacle limps on under a new government and new CEO – owenduffy.net
Owen – Page 2 – owenduffy.net
Owen – Page 24 – owenduffy.net
Spoiling balun action with ‘shielded twin’ – owenduffy.net
OCF dipoles – owenduffy.net
What does an Antenna Tuning Unit (ATU) do? – owenduffy.net
Feed point voltage – W5WSS 7′ dipole – owenduffy.net
Thermograph of small transmitting loop – owenduffy.net
Ground effects on KP4MD’s 0.9m loop on 28MHz – owenduffy.net
Small transmitting loop EMR safety – EMR Calc predictions – 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
APRS – Page 2 – owenduffy.net
APRS – Page 6 – owenduffy.net
Efficiency and gain of Small Transmitting Loops (STL) – owenduffy.net
Are inline RF wattmeters really averaging – owenduffy.net
Analysers – help or hindrance – owenduffy.net
Update for NFM software (v1.18.0) – owenduffy.net
Test equipment – Page 2 – owenduffy.net
Test equipment – Page 3 – owenduffy.net
owenduffy.net – Page 3 – Mostly electronics…
Open squelch DCD for Paccomm Tiny2 Mk2 – owenduffy.net
Galvanised steel wire OCF dipole – owenduffy.net
Headless aprx server trial – owenduffy.net
Headless aprx server – trial wrapup – owenduffy.net
End fed wires – new hams love ’em – owenduffy.net
A simple preamp for dynamic capsules to suit radios using electret microphones – owenduffy.net
owenduffy.net performance improvement – owenduffy.net
Simple Morse beacon keyer updated 2014/03/01 – owenduffy.net
Flashing LED driver using an ESC – owenduffy.net
I2C – LCD interface – Type 1 – owenduffy.net
(How) does this balun work? – owenduffy.net
Baluns – Rule 500 – owenduffy.net
Using Ohms law on antenna baluns – owenduffy.net
ON9CVD on baluns – owenduffy.net
Feed point voltage – full wave dipole – owenduffy.net
Baluns – Page 2 – owenduffy.net
Baluns – Page 3 – owenduffy.net
Ubuntu LTS upgrades get better – v14.04 – owenduffy.net
The fraud of energy efficient lighting – e-ballasts – owenduffy.net
Review of Ceramica ceramic bearing fans – owenduffy.net
Fan frustrations – owenduffy.net
Coax connectors and accurate / repeatable measurements – owenduffy.net
Tunemate update – owenduffy.net
Bushnell Back Track D-TOUR – owenduffy.net
Using an attenuator for NoiseLo/NoiseHi in NFM – owenduffy.net
Noise FIgure Meter – 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
Cooling an IC2200H – owenduffy.net
Electronics – Page 2 – owenduffy.net
COMP_PWM and SimonK ESC firmware – part 2 – owenduffy.net
An inexpensive medium power tuner current balun for HF using Jaycar parts – owenduffy.net
High altitude balloon – 2014-02-08 – 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 – #1 – owenduffy.net
Tricopter build – 20140123 – owenduffy.net
Maker – Page 2 – owenduffy.net
BLHeli v12.0 review – owenduffy.net
Turnigy Micro Tach – battery issues – owenduffy.net
BLHeli v11.2 damping evaluation – owenduffy.net
ESC oscillator accuracy – Silabs internal oscillator – owenduffy.net
Comparison of SimonK and BLHeli on an Afro30 ESC – owenduffy.net
BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #3 – owenduffy.net
BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – owenduffy.net
BLHeli on Hobbyking 40A ESC 4A UBEC 9261000003 – #2 – owenduffy.net
SimonK ESC FW – test of commit 1f75da – #4 – owenduffy.net
RC models – Page 2 – owenduffy.net
RC models – Page 4 – owenduffy.net
DJ9BV & F6HYE G/T formula – owenduffy.net
DJ3JJ’s 432MHz EME Yagi article in Dubus 1/2010 – 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
G/T spreadsheet update (v1.09) – owenduffy.net
Trying to make sense of the VE7BQH Yagi performance tables – owenduffy.net
Receivers – Page 2 – owenduffy.net
Receivers – Page 3 – owenduffy.net
The sign of reactance – owenduffy.net
Loss of JSC ladder line at 160m – owenduffy.net
Double Bazooka magic – owenduffy.net
Transmission lines – Page 2 – owenduffy.net
Transmission lines – Page 6 – 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
Transmitters – Page 2 – owenduffy.net
Transmitters – Page 6 – owenduffy.net
TNC-X build – owenduffy.net
A quadcopter tuning story – symmetry is important – owenduffy.net
Definition: Current Balun, Voltage Balun – owenduffy.net
Antennas and Q – owenduffy.net
VK1OD Roger Beep project documentation – owenduffy.net
Roger Beep fitted to MFJ-1263 microphone / rig switch – owenduffy.net
Small transmitting loop – linear circuit analysis – owenduffy.net
Amateur Radio – Page 18 – owenduffy.net
owenduffy.net – Page 23 – Mostly electronics…
Owen – Page 23 – owenduffy.net
The mobile APRS W2 digi left town this morning – owenduffy.net
Estimating near field strength with small antennas – owenduffy.net
ARRL Test Procedures Manual (Rev L) – Noise Figure calculation – owenduffy.net
Headless javAPRSSrvr – trial wrap up – owenduffy.net
Amateur Radio – Page 17 – owenduffy.net
APRS – Page 5 – owenduffy.net
Headless javAPRSSrvr – owenduffy.net
Latency in APRS networks – owenduffy.net
Should you use MIC-E compression in your APRS tracker – owenduffy.net
owenduffy.net – Page 22 – Mostly electronics…
Antennas – Page 8 – owenduffy.net
Owen – Page 22 – owenduffy.net
Open squelch data carrier detect for TNC-2 – owenduffy.net
Argent Data T3-135 review – owenduffy.net
ATU voltage verification – 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
Foxtrak review – owenduffy.net
TinyTrak3 v1.42 review – owenduffy.net
Amateur Radio – Page 16 – owenduffy.net
Foxtrak build – owenduffy.net
Review of APRSTRACKER v0.11firmware – owenduffy.net
Additional loss due to VSWR – a quite flawed concept – owenduffy.net
Earth continuity testing of amateur equipment – owenduffy.net
owenduffy.net – Page 21 – Mostly electronics…
Unun on 13m (43′) vertical – owenduffy.net
Owen – Page 21 – 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
VK2OMD G5RV with tuned feeder – line loss – 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
Are you getting the best performance from your FM AFSK APRS transmitter – owenduffy.net
APRS call sign corruption at iGate – owenduffy.net
Amateur Radio – Page 15 – owenduffy.net
Audio level setup on TNC-X (MFJ-1270X) – owenduffy.net
APRS – Page 4 – owenduffy.net
owenduffy.net – Page 20 – Mostly electronics…
Owen – Page 20 – owenduffy.net
Small transmitting loop – NEC-4 analysis – owenduffy.net
Transmitters – Page 5 – owenduffy.net
Amateur Radio – Page 14 – owenduffy.net
Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #3 – owenduffy.net
Common mode current and coaxial feed lines – owenduffy.net
VK3FI QRSS on 473kHz – 19/06/2014 – owenduffy.net
Windowed ladder line loss – G3TXQ #2 – owenduffy.net
Windowed ladder line loss – G3TXQ – owenduffy.net
owenduffy.net – Page 19 – Mostly electronics…
Owen – Page 19 – owenduffy.net
Simple Morse beacon keyer for VK3FI on 600m – owenduffy.net
A QRP small transmitting loop evaluation – owenduffy.net
Simple resonators might not appear as such initially – owenduffy.net
VSWR curve of a simple series resonant antenna – owenduffy.net
Transmission lines – Page 5 – owenduffy.net
Amateur Radio – Page 13 – owenduffy.net
APRS – Page 3 – owenduffy.net
owenduffy.net – Page 18 – Mostly electronics…
Owen – Page 18 – owenduffy.net
owenduffy.net – Page 17 – Mostly electronics…
Amateur Radio – Page 12 – owenduffy.net
Owen – Page 17 – owenduffy.net
Small transmitting loop calculators – a comparison – owenduffy.net
ARRL Antenna Book 21 on small transmitting loops – owenduffy.net
Transmitters – Page 4 – owenduffy.net
Amateur Radio – Page 11 – owenduffy.net
owenduffy.net – Page 16 – Mostly electronics…
Owen – Page 16 – owenduffy.net
Foundation manual on power measurement – owenduffy.net
Foundation watts explained – owenduffy.net
IC-7410 tests – 04 – Tx power & SWR meter – owenduffy.net
IC-7410 tests – 03 – Noise Figure – owenduffy.net
IC-7410 tests – owenduffy.net
IC-7410 tests – 02 – digital audio output – owenduffy.net
IC-7410 tests – 01 – linearity – owenduffy.net
Transmitters – Page 3 – owenduffy.net
owenduffy.net – Page 15 – Mostly electronics…
Amateur Radio – Page 10 – owenduffy.net
Owen – Page 15 – owenduffy.net
Designing high performance VHF/UHF receive systems – Part 7 – owenduffy.net
Antennas – Page 7 – owenduffy.net
SimonK ESC FW – test of commit 1f75da – #2 – owenduffy.net
owenduffy.net – Page 14 – Mostly electronics…
Owen – Page 14 – owenduffy.net
TLW v3.24 checkout – owenduffy.net
TV upgrade – owenduffy.net
Do SWR meters make you stupid – owenduffy.net
SimonK ESC FW – test of commit 1f75da – #3 – owenduffy.net
RC models – Page 3 – owenduffy.net
The magic of small transmitting loops – owenduffy.net
Antennas – Page 6 – owenduffy.net
Assembling clamp type coax connectors – owenduffy.net
WIA 4:1 current balun – further explanation – owenduffy.net
Measuring common mode current on coax – owenduffy.net
Arduino RC servo ramp generator – owenduffy.net
Efficiency / gain of a Small Transmitting Loop – a worked example – owenduffy.net
Amateur Radio – Page 8 – owenduffy.net
owenduffy.net – Page 12 – Mostly electronics…
Owen – Page 12 – owenduffy.net
Transmission lines – Page 4 – owenduffy.net
A look at internal losses in a typical ATU – owenduffy.net
Slot car controller connectors – AU – owenduffy.net
G5RV woes – W6OGC – owenduffy.net
PIK and auto-space – owenduffy.net
owenduffy.net – Page 11 – Mostly electronics…
Antennas – Page 5 – owenduffy.net
Owen – Page 11 – owenduffy.net
Amateur Radio – Page 7 – owenduffy.net
Designing high performance VHF/UHF receive systems – owenduffy.net
Designing high performance VHF/UHF receive systems – Part 1 – owenduffy.net
Designing high performance VHF/UHF receive systems – Part 2 – owenduffy.net
Designing high performance VHF/UHF receive systems – Part 3 – owenduffy.net
Designing high performance VHF/UHF receive systems – Part 4 – owenduffy.net
Designing high performance VHF/UHF receive systems – Part 5 – owenduffy.net
Designing high performance VHF/UHF receive systems – Part 6 – owenduffy.net
High performance 144MHz transverter design workup – noise and gain analysis – owenduffy.net
Small transmitting loop review – owenduffy.net
owenduffy.net – Page 10 – Mostly electronics…
Amateur Radio – Page 6 – owenduffy.net
Owen – Page 10 – owenduffy.net
Antennas – Page 4 – owenduffy.net
BLHeli v11.0 on APM X450 quad – owenduffy.net
Hobbyking X900 tricopter wrapup – owenduffy.net
COMP_PWM and SimonK ESC firmware – owenduffy.net
Tricopter build – 20140204 – owenduffy.net
SimonK ESC FW – test of commit 8873df24 – #3 – owenduffy.net
owenduffy.net – Page 9 – Mostly electronics…
Owen – Page 9 – owenduffy.net
SimonK ESC FW – test of commit 8873df24 – #2 – owenduffy.net
VK2OMD ambient noise measurement 144MHz – 20140217 – owenduffy.net
Tricopter build – 20140201 – owenduffy.net
Review of Hakko FG-100 soldering iron thermometer – owenduffy.net
Tricopter build – 20140131 – owenduffy.net
Wire current rating for single FEP (Teflon) or Silicone insulated (200°) conductor in free air (30°). – owenduffy.net
Owen – Page 8 – owenduffy.net
Speaker cable as RF transmission line – owenduffy.net
Transmission lines – Page 3 – owenduffy.net
WIA 4:1 current balun – owenduffy.net
Mag loop or radiating dummy load? – owenduffy.net
Measuring matched line loss – owenduffy.net
Owen – Page 7 – owenduffy.net
New ham licence, finally! – owenduffy.net
RG174 for portable HF operation – owenduffy.net
Hobbyking A30 issues – owenduffy.net
Some thoughts on zero crossing detection in sensorless brushless DC motors – owenduffy.net
Atten AT191 review – owenduffy.net
owenduffy.net – Page 6 – Mostly electronics…
February 2014 – Page 2 – owenduffy.net
February 2014 – Page 4 – owenduffy.net
Cobwebb antenna impedance matching scheme – owenduffy.net
SimonK ESC FW – test of commit 8873df24… – owenduffy.net
January 2014 – Page 2 – owenduffy.net
Yet another dodgy coax collinear – owenduffy.net
Are radio hams ‘makers’ – owenduffy.net
A/B comparison test on 40m – owenduffy.net
December 2013 – Page 2 – owenduffy.net
Hobbywing Skywalker 40A ESC – initial testing – owenduffy.net
Owen – Page 3 – owenduffy.net
Owen – Page 6 – owenduffy.net
HK DT750 motor, Afro30 ESC and SimonK 8c2cf42/comp_pwm – owenduffy.net
3030 antenna – owenduffy.net
Wire dipole on 160m – owenduffy.net
owenduffy.net – Page 4 – Mostly electronics…
owenduffy.net – Page 5 – Mostly electronics…
February 2014 – Page 3 – owenduffy.net
Owen – Page 4 – owenduffy.net
Owen – Page 5 – owenduffy.net
March 2014 – Page 2 – owenduffy.net
owenduffy.net – Page 8 – Mostly electronics…
Amateur Radio – Page 5 – owenduffy.net
April 2014 – Page 2 – owenduffy.net
IC-7000 current consumption – owenduffy.net
Amateur Radio – Page 3 – owenduffy.net
Antennas – Page 3 – owenduffy.net
ESC ceramic resonator accuracy – owenduffy.net
Amateur Radio – Page 4 – owenduffy.net
owenduffy.net – Page 7 – Mostly electronics…
May 2014 – Page 2 – owenduffy.net
owenduffy.net – Page 13 – Mostly electronics…
June 2014 – Page 2 – owenduffy.net
Validation of loop efficiency calculator – owenduffy.net
Amateur Radio – Page 9 – owenduffy.net
Owen – Page 13 – owenduffy.net
July 2014 – Page 2 – owenduffy.net
August 2014 – Page 2 – owenduffy.net
August 2014 – Page 3 – owenduffy.net
September 2014 – Page 2 – owenduffy.net
September 2014 – Page 3 – owenduffy.net
October 2014 – Page 2 – owenduffy.net
November 2014 – Page 2 – owenduffy.net
November 2014 – Page 3 – owenduffy.net
RFPM1 – owenduffy.net
Do gamma matches necessarily degrade bandwidth – owenduffy.net
Analysis of a series of NEC-4 models of a low loss small transmitting loop at 7MHz at varying height – owenduffy.net
owenduffy.net – Page 25 – Mostly electronics…
Antennas – Page 10 – owenduffy.net
Owen – Page 25 – owenduffy.net
Near-field field strength measurements using the RFPM1 – owenduffy.net
Review of Boswell et al paper “Performance of a small loop antenna in the 3-10 MHz band” – owenduffy.net
Near-field field strength measurements using a diode detector – owenduffy.net
Solder cream has a use-by date – owenduffy.net
Amateur Radio – Page 20 – owenduffy.net
Maker – Page 3 – owenduffy.net
December 2014 – Page 2 – owenduffy.net
QRP2000 synthesiser build – owenduffy.net
ashim at shell servo – owenduffy.net
Baluns – show me the numbers – owenduffy.net
On Witt’s calculation of Matched Line Loss from Return Loss – owenduffy.net
January 2015 – owenduffy.net
Another Osram e-ballast bites the dust – owenduffy.net
Inexpensive utility rechargeable 9V battery pack for test instruments – owenduffy.net
owenduffy.net – Page 26 – Mostly electronics…
Owen – Page 26 – owenduffy.net
LM386 audio power amplifiers – owenduffy.net
Radcom review of Alpha Antenna microtune magnetic loop – owenduffy.net
Low power Guanella 1:1 tuner balun using a pair of Fair-rite 2643625102 suppression sleeves – owenduffy.net
Low power Guanella 1:1 tuner balun using a pair of Jaycar LF1260 suppression sleeves – owenduffy.net
VK1OD.net closure – owenduffy.net
BNC 75/50 compatibility – owenduffy.net
AIM 882 produces internally inconsistent results – owenduffy.net
Amateur Radio – Page 21 – owenduffy.net
Loss of Wireman 553 windowed ladder line at MF/HF – owenduffy.net
Transmission lines – Page 7 – owenduffy.net
USB – RS232/TTL/485 adapter – owenduffy.net
Small Transmitting Dipole – owenduffy.net
Comparison of two small transmitting loops – owenduffy.net
owenduffy.net – Page 27 – Mostly electronics…
Antennas – Page 11 – owenduffy.net
Owen – Page 27 – owenduffy.net
January 2015 – Page 2 – owenduffy.net
Loss of Wireman 553 windowed ladder line at MF/HF – does it matter – owenduffy.net
Apples have just come off the trees – owenduffy.net
Cooking – owenduffy.net
AIM 882 produces internally inconsistent results – more tests – owenduffy.net
AIMuhf – my strategy – owenduffy.net
Quiet solar radio flux interpolations calculator – owenduffy.net
Diamond X50N measurements – AIMuhf and AA-600 – owenduffy.net
Test equipment – Page 4 – owenduffy.net
Measuring balun common mode impedance – #1 – 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
Amateur Radio – Page 22 – owenduffy.net
January 2015 – Page 3 – owenduffy.net
owenduffy.net – Page 28 – Mostly electronics…
Owen – Page 28 – owenduffy.net
NEC – current or voltage source – owenduffy.net
APRS traffic study – VK2OMD-3 08/02/2015 – owenduffy.net
Exploitation of NEC’s GM card #2 – owenduffy.net
Measuring balun common mode impedance – #2 – owenduffy.net
AIM use & issues – owenduffy.net
Uncategorized – Page 2 – owenduffy.net
RS485 termination / bias adapter – owenduffy.net
Ferrite K mix – owenduffy.net
Electronics – Page 3 – owenduffy.net
Jaycar MP3090 / Manson SPS-9400 repair – owenduffy.net
Amateur Radio – Page 23 – owenduffy.net
Sevick’s comments on selection of ferrite mix – owenduffy.net
Attempting to reconcile W5DXP & G3TXQ’s comparison of K and 52 mix ferrites – owenduffy.net
Owen – Page 29 – owenduffy.net
Baluns – Page 4 – owenduffy.net
February 2015 – Page 2 – owenduffy.net
Attempting to reconcile W5DXP & G3TXQ’s comparison of K and 52 mix ferrites #2 – owenduffy.net
On-air testing of APRS digipeater with a crafted suite of test records – owenduffy.net
LP-100A manual advice on VSWR measurement – owenduffy.net
Transmission lines – Page 8 – owenduffy.net
Transmitters – Page 7 – owenduffy.net
Review of Trask’s 1:1 current balun – owenduffy.net
March 2015 – owenduffy.net
Feeding at a current maximum – owenduffy.net
Antennas – Page 13 – owenduffy.net
Feeding at a current maximum, and three other options – owenduffy.net
SimonK on Hobbyking 40A ESC 4A UBEC 9261000003 – owenduffy.net
Leafeater retro fit – owenduffy.net
owenduffy.net – Page 30 – Mostly electronics…
Owen – Page 30 – owenduffy.net
Hobbyking Swamp Dawg build – #1 – owenduffy.net
Miscellaneous – owenduffy.net
Slot.it CA20A rework – owenduffy.net
Slot cars – owenduffy.net
Speaker wire is so popular as an RF transmission line – owenduffy.net
A new impedance calculator for RF inductors on ferrite cores – owenduffy.net
Accuracy of AIMuhf system – AIM865A vs AIM882 on a ferrite cored inductor – owenduffy.net
March 2015 – Page 2 – owenduffy.net
AIM885 Refer To Antenna checkout – owenduffy.net
Accuracy of AIMuhf system – AIM865A vs AIM882 vs AIM885 on a ferrite cored inductor – owenduffy.net
AIM 885 produces internally inconsistent results – owenduffy.net
Amateur Radio – Page 24 – owenduffy.net
AIM use & issues – Page 2 – owenduffy.net
AIM 885A produces internally inconsistent results – owenduffy.net
April 2015 – owenduffy.net
Raspberry Pi 2 initial impressions – owenduffy.net
RPi – owenduffy.net
owenduffy.net – Page 31 – Mostly electronics…
Owen – Page 31 – owenduffy.net
RPi – Page 2 – owenduffy.net
Small Transmitting Loops – owenduffy.net
Small Transmitting Loops – Page 2 – owenduffy.net
Slot.it CA20Z build – owenduffy.net
N2006P PID checkout #1 – owenduffy.net
Using a Pt100 RTD with my generic heating / cooling controller – owenduffy.net
An inexpensive Chinese regulated power supply kit. – owenduffy.net
Accuracy of AIMuhf system – AIM865A vs AIM885Gx on a ferrite cored inductor – owenduffy.net
May 2015 – owenduffy.net
Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3540-14 brushless drive – owenduffy.net
Slot.it CS23B build – owenduffy.net
BLDC ESC – effect of insufficient dead time – owenduffy.net
Adafruit MAX31855 checkout – owenduffy.net
Coupled coils – a challenge for hams! – owenduffy.net
owenduffy.net – Page 32 – Mostly electronics…
Owen – Page 32 – owenduffy.net
SPI input for the generic heating / cooling controller – owenduffy.net
A test run of the generic heating / cooling controller with Pt100 sensor – owenduffy.net
A walk through of a practical application of AIMuhf/AIM900 – owenduffy.net
Report on Hobbyking 40A ESC 4A UBEC 9261000003 / BC3540-14 brushless drive #2 – owenduffy.net
May 2015 – Page 2 – owenduffy.net
A walk through of a practical application of AIMuhf/AIM900A #2 – owenduffy.net
Test equipment – Page 5 – owenduffy.net
Thermal observations on Neosid 28-053-31 ferrite toroid – owenduffy.net
Dodgy Chinese thermocouple thermometer – owenduffy.net
owenduffy.net – Page 33 – Mostly electronics…
Owen – Page 33 – owenduffy.net
VK3YE’s 3m circumference copper tube loop with RG213 stub tuning – owenduffy.net
Review of Banggood digital clock kit – owenduffy.net
Cooling an IC2200H – update – owenduffy.net
Review of Banggood digital clock kit #2 – owenduffy.net
Amateur Radio – Page 25 – owenduffy.net
Small Transmitting Loops – Page 3 – owenduffy.net
Review of inexpensive Chinese thermostat – MH-1210 – owenduffy.net
Electronics – Page 5 – owenduffy.net
Enhancement of Calculate small transmitting loop gain from bandwidth measurement – owenduffy.net
Cooling an IC2200H – update #2 – owenduffy.net
VK3IL’s 3m circumference LDF4-50B loop on 20m – owenduffy.net
Review of inexpensive Chinese thermostat – 8010F – owenduffy.net
owenduffy.net – Page 34 – Mostly electronics…
Owen – Page 34 – owenduffy.net
Capacitive loading device for fine tuning wire dipoles – owenduffy.net
Capturing the AVR hex file built by Arduino on Windows – owenduffy.net
Maker – Page 4 – owenduffy.net
June 2015 – Page 2 – owenduffy.net
Time to get some experience with 32bit microcontrollers – owenduffy.net
Antenna span spring tensioner – owenduffy.net
Antennas – Page 14 – owenduffy.net
Antenna span tensioner using a counterweighted halyard – owenduffy.net
Thermistor for CBAIV – owenduffy.net
Baofeng GT-3TP MkIII review – owenduffy.net
Review of inexpensive Chinese thermostat – MH-1210 #2 – owenduffy.net
Using the AIM to measure matched line loss – owenduffy.net
Fox flasher MkII – owenduffy.net
owenduffy.net – Page 35 – Mostly electronics…
Owen – Page 35 – owenduffy.net
Programming jig for STC15Fx DIP-8, DIP-28 chips – owenduffy.net
June 2015 – Page 3 – owenduffy.net
Review of inexpensive Chinese thermostat – 8010F #2 – owenduffy.net
Electronics – Page 6 – owenduffy.net
DYS SN20A out of the box – owenduffy.net
Balanced ATUs and common mode current – 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
July 2015 – owenduffy.net
Amateur Radio – Page 26 – owenduffy.net
Antenna Tuners (ATU) – Page 2 – owenduffy.net
Transmission lines – Page 9 – owenduffy.net
Transmit performance of 2m hand held transceivers – owenduffy.net
Fox flasher MkII #2 – owenduffy.net
Matching a quarter wave monopole with two variable caps – owenduffy.net
Fox flasher MkII #3 – owenduffy.net
Accuracy of AIMuhf system – AIM910A vs several recent versions on a ferrite cored inductor – owenduffy.net
owenduffy.net – Page 36 – Mostly electronics…
Owen – Page 36 – owenduffy.net
RC4 thermistor characterisation. – owenduffy.net
An experience with STC 8051 microcontrollers – owenduffy.net
Computing – Page 2 – owenduffy.net
July 2015 – Page 2 – owenduffy.net
An interesting case study – in service evaluation of coax loss – owenduffy.net
Slot.it orange CA20Z build – owenduffy.net
Transmit performance of 2m hand held transceivers – absolute gain estimates – owenduffy.net
Arduino thermistor thermometer – a tutorial – owenduffy.net
I2C – LCD interface – Type 2 – owenduffy.net
Maker – Page 5 – owenduffy.net
Small transmitting loop – gamma match – owenduffy.net
Arduino HMC5883 magnetometer – a tutorial – owenduffy.net
Arduino stepper motor – a tutorial – owenduffy.net
owenduffy.net – Page 37 – Mostly electronics…
Owen – Page 37 – owenduffy.net
Arduino – Page 2 – owenduffy.net
Solar power supply for foxflasher2 – owenduffy.net
Effect of ground on HF horizontal dipole efficiency – more detail – owenduffy.net
Cooling an FT2800M – owenduffy.net
August 2015 – owenduffy.net
Electronics – Page 7 – owenduffy.net
A tale of two USB-RS232 adapters – owenduffy.net
USBTiny – owenduffy.net
Small transmitting loop – ground loss relationship to radiation resistance – owenduffy.net
Antennas – Page 15 – owenduffy.net
Accuracy of estimation of radiation resistance of small transmitting loops – owenduffy.net
NEC-4 vs NEC-2 on a low small transmitting loop – owenduffy.net
An A/B comparison of a low G5RV with a MobileOne M40-1 – owenduffy.net
Amateur Radio – Page 27 – owenduffy.net
An A/B comparison of a low G5RV with a MobileOne M40-1 – statistical analysis – owenduffy.net
APRS trial Bowral – Wilton – Wollongong – Macquarie Pass – Bowral – owenduffy.net
owenduffy.net – Page 38 – Mostly electronics…
Designing a Guanella 1:1 balun using the ‘unknown’ ferrite toroid – owenduffy.net
End fed matching – PA3HHO design review – owenduffy.net
Amateur Radio – Page 28 – owenduffy.net
Antennas – Page 16 – owenduffy.net
owenduffy.net – Page 39 – Mostly electronics…
Owen – Page 39 – owenduffy.net
Interesting Links – owenduffy.net
Helical loading and Calculate small transmitting loop gain from bandwidth measurement – owenduffy.net
Review of G3LDO STL (Radcom Sep 2010) – 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
September 2015 – Page 2 – owenduffy.net
Some tools for designing a Guanella 1:1 balun using ferrite toroids – owenduffy.net
Are copper clad VHF whips a marketing ploy – owenduffy.net
Some thoughts on the popular Carolina Windom antenna – owenduffy.net
October 2015 – owenduffy.net
Adjusting KISS TNC AFSK tx level using an improved isochronous test packet – owenduffy.net
APRS – Page 7 – owenduffy.net
A cheap and cheerful data logger – owenduffy.net
Test equipment – Page 6 – owenduffy.net
October 2015 – Page 2 – owenduffy.net
Trombone capacitors in Small Transmitting Loops – owenduffy.net
OpenLog for TinyTrak – owenduffy.net
DK7ZB’s balun – owenduffy.net
Australian amateur population trends 1998 – 2015 – owenduffy.net
owenduffy.net – Page 41 – Mostly electronics…
Owen – Page 41 – owenduffy.net
OpenLog for TinyTrak – drive test – owenduffy.net
Electronics – Page 8 – owenduffy.net
Maker – Page 6 – owenduffy.net
NBN is coming… it seems – owenduffy.net
Zig zags in APRS tracks – owenduffy.net
The BLHeli sojourn is over – owenduffy.net
November 2015 – owenduffy.net
RC models – Page 5 – owenduffy.net
Mapping trips from APRS archives – owenduffy.net
Return Loss sweep using IC7410, RL bridge, and RFPM1 – owenduffy.net
An NEC-4.2 model of VK5BR’s 1m square loop for 20m – owenduffy.net
Underhill on Small Transmitting Loop efficiency – owenduffy.net
Small Transmitting Loops – Page 4 – owenduffy.net
Calculation of equivalent self capacitance of Small Transmitting Loop – owenduffy.net
Antennas – Page 17 – owenduffy.net
Calculation of equivalent self capacitance of Small Transmitting Loop – ARRL – owenduffy.net
owenduffy.net – Page 42 – Mostly electronics…
Owen – Page 42 – owenduffy.net
Dipole mode component of VK5BR’s 1m square loop for 20m – owenduffy.net
Dipole mode of Small Transmitting Loop per King – owenduffy.net
Amateur Radio – Page 30 – owenduffy.net
Small Transmitting Loops – Page 5 – owenduffy.net
Backtracking in APRS – owenduffy.net
Review of Austin et al paper “Loss mechanisms in the electrically small loop antenna” – owenduffy.net
November 2015 – Page 2 – owenduffy.net
NEC study of Small Transmitting Loop Q vs frequency – owenduffy.net
K4PP’s 1m Small Transmitting Loop – owenduffy.net
On ignoring capacitor losses in Small Transmitting Loops – owenduffy.net
Belrose field strength measurements of his 80m mobile whip – owenduffy.net
Reconciling W5QJR’s loop formulas – owenduffy.net
Reconciliation of field strength to efficiency calculator with Boswell’s loop measurements – owenduffy.net
owenduffy.net – Page 43 – Mostly electronics…
Antennas – Page 18 – owenduffy.net
Owen – Page 43 – owenduffy.net
Trial of prototype stand alone GPS logger – owenduffy.net
Small Transmitting Loops – Page 6 – owenduffy.net
QRP antennas – owenduffy.net
Listings – owenduffy.net
My Listings – owenduffy.net
Proposed 60m amateur band power limit – owenduffy.net
Amateur Radio – Page 31 – owenduffy.net
RC PWM – ON/OFF switch – owenduffy.net
December 2015 – owenduffy.net
Computing – Page 3 – owenduffy.net
Transmitters – Page 8 – owenduffy.net
AUT – MobileOne M40-1 40m helical – owenduffy.net
VSWR=1 and X≠0 – owenduffy.net
Revised thinking on STC chips – owenduffy.net
Transmission lines – Page 10 – owenduffy.net
Win 10 Threshold 2 issues – owenduffy.net
Expression of VSWR as a simple decimal real number – owenduffy.net
Exploiting your antenna analyser #1 – owenduffy.net
owenduffy.net – Page 44 – Mostly electronics…
Owen – Page 44 – owenduffy.net
NEC model of the quarter size G5RV – owenduffy.net
WSPR version confusion – owenduffy.net
Evolution of WSPR – owenduffy.net
Is maximum power transfer and conjugate matching simultaneously possible – 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 #8 – owenduffy.net
Walter Maxwell’s teachings on system wide conjugate matching – owenduffy.net
Exploiting your antenna analyser #7 – owenduffy.net
Can the magnitude of the complex reflection coefficient (ρ) be greater than 1 – owenduffy.net
18650 Lithium Ion cells on eBay – owenduffy.net
Quiet solar radio flux interpolations calculator – owenduffy.net
Graphic demonstration of loss under standing waves – owenduffy.net
Exploiting your antenna analyser #6 – owenduffy.net
Exploiting your antenna analyser #5 – owenduffy.net
Exploiting your antenna analyser #4 – owenduffy.net
It has been two years already… – owenduffy.net
Exploiting your antenna analyser #3 – owenduffy.net
On negative VSWR – owenduffy.net
Exploiting your antenna analyser #11 – owenduffy.net
Some thoughts on noise on 6m (50MHz)… – owenduffy.net
Canberra trip – APRS / GPS logger – owenduffy.net
Panasonic NCR18650B Lithium Ion cells on eBay – owenduffy.net
ANS T1.523-2001, Telecom Glossary 2000 and Return Loss – owenduffy.net
Update for FSM software (v1.11.0) – owenduffy.net
Exploiting your antenna analyser #2 – owenduffy.net
Exploiting your antenna analyser – owenduffy.net
Search Results for “qsrf” – owenduffy.net
January 2016 – owenduffy.net
September 2015 – owenduffy.net
Graphic demonstration of loss under standing waves #3 – owenduffy.net
VSWR expressed as 1:n – owenduffy.net
Some thoughts on a two turn small transmitting loop – owenduffy.net
Ultrafire XML-T6 LED torch – a fix for the dysfunctional mode memory ‘feature’ – owenduffy.net
xmlrpc.php?rsd
Chinese AD8307 power measurement module #2 – owenduffy.net
Analysis of a certain dipole animation – 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
Review of Dunlavy’s STL patent gain claims – owenduffy.net
Expected ambient noise – in practice – owenduffy.net
Australian Lime Marmalade – owenduffy.net
Exploiting your antenna analyser #21 – owenduffy.net
Chinese AD8307 power measurement module #4 – owenduffy.net
Silver vs alkaline button cells – owenduffy.net
Atten APS3005S – a better thermostatic fan control – owenduffy.net
A drive test of RTKLIB accurate GPS – owenduffy.net
New hosting service – 2016/08/10 – owenduffy.net
Apologies for service disruption – owenduffy.net
Time to get some experience with 32bit microcontrollers – some progress – owenduffy.net
Exploiting your antenna analyser #23 – owenduffy.net
End fed half wave – NEC models for 20m – owenduffy.net
Mandarin & Lime Marmalade – owenduffy.net
Accuracy of AIMuhf system – AIM910B vs several recent versions on a ferrite cored inductor – owenduffy.net
Australian Lime & Lemon Marmalade – owenduffy.net
Another chapter in the NBN debacle – Jul 2016 – owenduffy.net
Tahitian Lime Marmalade – owenduffy.net
InsertionVSWR of Red Dot 2016A – owenduffy.net
InsertionVSWR of Grebenkemper’s Tandem Match – owenduffy.net
Fan controlled by humidity sensor – design technique – owenduffy.net
InsertionVSWR of Revex W560 on HF – owenduffy.net
KG-UV920P repair / modification for driver FET failure – owenduffy.net
Fan controlled by humidity sensor – owenduffy.net
Thinking about vibration forces from a bent prop adapter – owenduffy.net
Cleanflight and PPM – owenduffy.net
Review of inexpensive Chinese thermostat – STC-1000 – owenduffy.net
Optimal Zo for TLT sections challenge – a solution – owenduffy.net
Optimal Zo for Guanella balun sections – owenduffy.net
Comparison of SimonK and BLHeli 14.6 on an Afro30 ESC – owenduffy.net
Can a hand held analyser be used to evaluate Insertion VSWR of a VSWR meter? – owenduffy.net
Dataflash on NAZE32 – owenduffy.net
U-BLOX LEA-6T GPS module – for experiments – owenduffy.net
Coax switches – is shorting unused port necessary for isolation? – 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
Exploiting your antenna analyser #22 – 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
UV cure adhesive for temperature sensors – owenduffy.net
W2AU 1:1 voltage balun – owenduffy.net
PAROT with transformerless power supply and 230V AC relay – owenduffy.net
Expected ambient noise – owenduffy.net
PAROT with transformerless power supply and 10A SSR – owenduffy.net
Digital document signatures – owenduffy.net
August 2016 – owenduffy.net
July 2016 – owenduffy.net
June 2016 – owenduffy.net
May 2016 – owenduffy.net
April 2016 – owenduffy.net
March 2016 – owenduffy.net
February 2016 – owenduffy.net
June 2015 – owenduffy.net
February 2015 – owenduffy.net
owenduffy.net – Page 59 – Mostly electronics…
Arduino app to set DS1307 Real Time Clocks. – owenduffy.net
Analysis of a certain dipole animation – OCF implications – owenduffy.net
Search Results for “IC2200H cooling” – owenduffy.net
Exploiting your antenna analyser #19 – owenduffy.net
Voltage withstand of Vero strip board – owenduffy.net
owenduffy.net – Page 58 – Mostly electronics…
The old wheelbarrow will not die – owenduffy.net
Transformerless power supply for PAROT – 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
Exploiting your antenna analyser #18 – owenduffy.net
Exploiting your antenna analyser #17 – owenduffy.net
owenduffy.net – Page 57 – Mostly electronics…
Fox flasher MkII – high power 2 LED solar powered beacon – owenduffy.net
Exploiting your antenna analyser – contents – owenduffy.net
Exploiting your antenna analyser #16 – 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
USB-A to DC 5.5/2.1mm power cable – current carrying capacity – owenduffy.net
owenduffy.net – Page 56 – Mostly electronics…
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
Making sense of LED output figures – owenduffy.net
A tale of three tuners – owenduffy.net
HC-500 – owenduffy.net
A generic run on timer using an ATTINY25 – owenduffy.net
Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #6 – owenduffy.net
Precision GPS experiment #1 – owenduffy.net
Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #5 – owenduffy.net
owenduffy.net – Page 55 – Mostly electronics…
Improved cooling for the MFJ-949E – owenduffy.net
CH340, CH341 USB to RS-232 chip compatibility – 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
Ultrafire XML-T6 torch review – owenduffy.net
APRS duplicate removal – trial #3 – owenduffy.net
Chinese 18650 Li-ion cells – Ultrafire capacity test – owenduffy.net
owenduffy.net – Page 54 – Mostly electronics…
End fed matching – analysis of VK3IL’s measurements – 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
Rigexpert’s Antscope takes a step backwards – owenduffy.net
Review of N6PAA’s 40m STL – owenduffy.net
Review of KK5JY’s 40m STL – owenduffy.net
owenduffy.net – Page 53 – Mostly electronics…
Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #4 – owenduffy.net
Exploiting your antenna analyser #14 – owenduffy.net
Exploiting your antenna analyser #13 – owenduffy.net
Exploiting your antenna analyser #12 – owenduffy.net
End fed matching – PA3HHO design review #2 – owenduffy.net
Updated: Calculate initial load line of valve RF amplifier – owenduffy.net
Red Ironbark picnic table – owenduffy.net
Identifying ferrite materials #2 – owenduffy.net
Reconciling my #52 choke design tool with G3TXQ’s measurements – owenduffy.net
Identifying ferrite materials – owenduffy.net
A prototype data logger for RFPM1 – owenduffy.net
Low Insertion VSWR HF Guanella 1:1 balun for instrumentation – owenduffy.net
owenduffy.net – Page 52 – Mostly electronics…
A little rigging this week (20160204) – owenduffy.net
APRS duplicate removal – trial #2 – owenduffy.net
Lithium battery – 1S protection boards – owenduffy.net
Low noise Yagis and 50MHz noise – 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
APRS duplicate removal – owenduffy.net
APRS – APRS-IS latency – owenduffy.net
owenduffy.net – Page 51 – Mostly electronics…
Hosting change – owenduffy.net
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