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Homepage Last updated: 2017, November 20
Total pages: 2029

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owenduffy.net index
Digital document signatures
Disclaimer
    
grabber3 pages
QRSS grabber @ VK2OMD
Grabber case studies
Making inferences from QRSS grabber observations
         
ISP
              
graph9 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
t2.htm
percentiles.tab
         
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)
              
Q450-Q211 page
Q450 quadcopter - Q22 (30/06/2016 build)
              
X450-031 page
X450-03 quadcopter - Q11 (19/03/2015 build)
              
X450-Q11-041 page
X450-04 quadcopter - Q11 (10/01/2017 build)
              
Q450-Q21-021 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
         
nfm7 pages
NFM Home Page
NFM Support
NFM FAQ
NFM Registration
NFM.pdf
NfmFunctions.xls
NFM Home Page
              
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
    
recipe18 pages
Favourite Recipes
Shortcrust Pastry
Biscuit Pastry
Choux Pastry
Pasta - Basic
Plain Scones
Date Scones
Pizza Dough
White Bread
Generic Jam recipe
Raghaven's masala
Tandoori 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
         
data4 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
Site Map Page 4 - Generated by www.xml-sitemaps.com
    
antenna1 page
VK1OD Theme page: Antenna
         
concepts4 pages
Antenna Effective Aperture
Effective Radiated Power (ERP)
Setting up shunt matching with an MFJ259B or the like
ShuntMatchGraphs.pdf
              
dBd1 page
dB, dBi, and dBd
         
iobr2 pages
The importance (or not) of being resonant
The importance (or not) of being resonant
         
arrm1 page
Amateur Radio Magazine reinforces antenna resonance myth
         
aabtnaaa1 page
Is any antenna better than no antenna at all?
         
conductors1 page
Loss in antenna conductor materials
         
misc11 pages
A simple explanation of the so called current forcing property of a quarter wave transmission line
Counterpoise - what does it mean?
Learning models or a poor workman always blames his tools
A simple explanation of the voltage forcing property of a half wave transmission line
Optimising a coax fed half wave dipole
Minimum length of a non-resonant multi-band dipole
In pursuit of dipole resonance with an MFJ259B
The Beta or Hairpin Match
Shielded station earth conductor
An explanation of the Comet CHA250
Corrosion protection of antenna connections
         
HalfFoldedDipole3 pages
Half Folded Half Wave Dipole
CY-144-4.nec
CY-144-4a.nec
         
FoldedDipole1 page
Folded Half Wave Dipole
         
dlv1 page
Dipole loaded vertical coax feed line
         
W8jiCoilExp1 page
Comment on W8JI's 2006 coil measurement experiment
         
GammaMatch3 pages
Designing a Gamma match using a Smith chart
Novel Gamma Match Construction
gamma.pdf
         
shieldedloop1 page
Small single turn un-tuned shielded loop
         
14MDipole1 page
14MHz Inverted Vee Dipole
         
7MDipole2 pages
An antenna for 7MHz local contacts
Bowral 7MHz dipole for local contacts
         
buddipole1 page
Field strength measurement - Buddipole and FSM
         
G5RV2 pages
Feeding a G5RV
Optimising a typical G5RV
         
PY2RML1 page
N4UJW / PY2RML Ham Universe short dipole
         
VK1ZKD-7MDipole1 page
7 MHz Dipole at VK1ZKD
         
133nobrainer1 page
Is the 133' centre fed multiband dipole a no-brainer
         
BowralG5RV2 pages
Bowral G5RV for local contacts
G5RV according to G5RV
         
cobra2 pages
NEC model of the Cobra antenna
nec.txt
         
DoubleBazooka2 pages
Double Bazooka Antenna performance
80mDB.nec
         
W5GI1 page
De-mystifying the W5GI Mystery Antenna
         
G4CQM50Dipole1 page
G4CQM 50Ω coaxial dipole
         
W5dxpCoilExp1 page
Comment on W5DXP's 2011 coil measurement experiment
         
ccps5 pages
An exploration of a cophased collinear array with coax phasing stubs
tl1.nec
tl2.nec
tl3.nec
tl4.nec
         
4over41 page
Four over Four for 144MHz
         
80mVertical1 page
Exploration of a design for an 80m vertical antenna - Part I
         
X-50A1 page
Diamond X-50A
         
WA6SVT4 pages
NEC Model of WA6SVT Omni-Gain Vertical Collinear for VHF and UHF
wa6svt-lmr400-01.nec
WA6SVT01.nec
wa6svt-lmr400-02.nec
         
scc1 page
Silicon Chip Collinear
         
dl6wu4 pages
DL6WU Long boom Yagi design tools
NEC-2 Models of DL6WU Yagis
Estimating Beamwidth of DL6WU long boom Yagis for the purpose of calculating an optimum stacking distance
DL6WU-100.nec
         
VB2141 page
Refurbishing a Hy-gain 2meter 14 element beam (214, VB-214)
         
InvertedL1 page
Inverted L for HF
         
m402 pages
Estimating Antenna Factor for a MobileOne M40 helical whip
Adjusting a short helically loaded HF vertical
         
multibandunloadedvertical3 pages
An unloaded vertical as a multi-band HF antenna
The VK5BUG Black Stick under the microscope
The Force12 Flagpole and FP-40C under the microscope
         
NaroomaEFW1 page
Narooma End Fed Wire
         
atcc3 pages
Antenna Tuner Calibration Chart
atcc.pdf
atcc2.pdf
         
H4BTV1 page
Hustler 4BTV Report
         
suw1 page
Electrically short unloaded whips on vehicles
         
StationMaster1 page
StationMaster on 40m
         
FiveEighth1 page
Matching a 5/8λ vertical
              
cs011 page
Matching a 5/8λ vertical - example 1
         
SmallUntunedSquareLoop9 pages
Small untuned single turn square loop for field strength measurements
Small square un-tuned loop for field strength measurement - NEC models
Small untuned single turn square loop for field strength measurements
Loop.xls
loop.nec
loop-nec2.pdf
Loop1000.tab
Loop600.tab
Loop600.pdf
         
ATU2 pages
Estimating T match ATU efficiency
Adjusting a T match ATU for best efficiency
         
AT2K1 page
Palstar AT2K
         
ATR301 page
Ameritron ATR-30
         
D1301 page
Diamond D130 Discone
         
post3 pages
Antenna mast for experimental use
Earthing system at VK1OD
Driving earth rods
         
NEC1 page
Exploitation of NEC's GM card
         
PcCapacitor1 page
PC high voltage RF capacitors
         
PA0RDT-MiniWhip2 pages
How DOES the PA0RDT Mini-Whip work
How DOES the PA0RDT Mini-Whip work
         
Innova1 page
InnovAntennas LFA explanation
    
balun1 page
VK2OMD Theme page: Baluns
         
concept9 pages
Baluns and ATUs
Is a 4:1 balun a good choice for use with an ATU on HF?
Counting turns on a toroidal core
Inductance of RF cored inductors and transformers
Definition: Current Balun, Voltage Balun
Balanced ATUs and common mode current
Are RF toroidal inductors self shielding
Identifying ferrite materials
Differential flux leakage in a Guanella 1:1 balun
              
cm2 pages
Baluns in antenna systems
Can a balun alter the tuning of an antenna system
         
Guanella2 pages
A model of a practical Guanella 1:1 balun
Model validation - FT240-61-35t
         
W2DU3 pages
A model of the W2DU 1:1 choke balun
80mdipole-80.nec
80mdipole-40.nec
         
G1-1-LO12381 page
A model of a Guanella 1:1 choke balun using a Jaycar LO1238 core
         
G1-1-LF12601 page
A model of a Guanella 1:1 choke balun using two Jaycar LF1260 cores
         
W2DU-LF12581 page
A model of the W2DU 1:1 choke balun using Jaycar LF1258 cores
         
W2DU-LF12601 page
A model of the W2DU 1:1 choke balun using Jaycar LF1260 cores
         
gsc1 page
A review of the Guanella 4:1 balun on a shared magnetic circuit
         
G1-1-FT140-611 page
A model of a Guanella 1:1 VHF choke balun using a FT140-61 core
         
inductor7 pages
Common mode choke design tool
A method for estimating the impedance of a ferrite cored toroidal inductor at RF
Zcm-31.xls
Zcm-43.xls
Zcm-52.xls
Zcm-F14.xls
Zcm-L15.xls
         
G1-1-28-053-311 page
HF current balun project
         
I4BBE1 page
A narrowband current balun using coax line sections
         
Ruthroff2 pages
A model of a practical Ruthroff 1:4 Unun
A model of a practical Ruthroff 1:4 balun
         
application2 pages
A perspective on the popular 4:1 Ruthroff balun at the base of a ground mounted untuned multi-band vertical
A perspective on the popular 4:1 Ruthroff balun at the base of a ground mounted untuned multi-band vertical
         
G0KSC1 page
The G0KSC hybrid balun
         
DK7ZB1 page
The DK7ZB balun
         
VK5AJL1 page
The VK5AJL bolt balun
    
transmissionline6 pages
VK1OD Theme page: Transmission lines
A comment on W5DXP’s paper “An Energy Analysis at an Impedance Discontinuity in an RF Transmission Line”
ARRL transmission line loss graphs
Twelfth wave TL transformers
The effect of a short discontinuity in transmission line characteristic impedance
Loss components in practical transmission lines at HF
         
TE1 page
Telegrapher's Equation
         
VSWR17 pages
VSWR and displacement
VSWR measurement
VSWR Myths
VSWR FAQ
Additional loss due to VSWR
MisMatch Loss given VSWR
Comment on W6VAT article on VSWR
Is Zs of a HF ham tx typically 50+j0?
Power in a mismatched transmission line
A simple VSWR analysis without mirrors
Misunderstanding VSWR misleads
Return Loss
A worked example of a Bird 43 with a grossly mismatched load
A test of Zs on an IC7000
Does SWR damage HF ham transmitters?
Accuracy of VSWR meters at high sensitivity
Getting more out of your directional wattmeter
         
fig82 pages
Figure-8 flex used as RF transmission line
PVC insulated feed line on HF
         
getl1 page
A graphical explanation of energy flow in a practical transmission line
         
aev1 page
Avoiding flashover in baluns and ATUs
         
concept4 pages
Modelling practical transmission lines
Does twisting a two wire open line reduce radiation
Estimating parameters of two wire transmission lines
Insertion Loss vs Transmission Loss
              
RelayComp1 page
High frequency compensation of T/R relay
              
MLLvHRL1 page
Estimating Matched Line Loss from Return Loss
              
mvf1 page
Measuring the velocity factor of coaxial transmission line
         
ZL1AN1 page
ZL1AN's transmission line challenge
         
OWLVSWR1 page
The merit of measuring VSWR on an open wire line
         
pcf1 page
Thinking aloud on pipe cap filters
         
folla1 page
The failure of lossless line analysis in the real world
         
RG61 page
RG-6/U for transmitting applications
         
stcm1 page
An analysis of current flow at the end of shielded twin line at radio frequencies
         
LOLL4 pages
A review of QST article "The Lure of Ladder Line"
Optimum length of ladder line
CCS ladder line suitability at lower HF
nec.txt
         
QWVmatch1 page
Matching a quarter wave vertical using TL elements
         
3001 page
300 ohm transmitting ladder line
    
rigging11 pages
VK1OD Theme page: Rigging
Sufficient sag for wire antenna spans for wind survival
Silver rope
Correct use of wire rope (‘bulldog’) grips
Is the K0FF mast step safe?
Mast tube design
Synthetic fibre rope for antenna rigging
Terminating a single core hard wire on an insulator
Wire Table
Comparison of observation of actual span with calculated model
MastCalculations.xls
         
tree1 page
Rigging wire antennas in trees
         
Qst13011 page
QST Jan 13 wire antenna loading
    
measurement7 pages
VK1OD Theme page: Measurement
Improved resolution of relative power measurement using a directional wattmeter
Using my Excel cubic spline interpolation functions
Digitising published graphs of component characteristics
Measuring average or mean power of a complex radio frequency wave
Using a slide rule to solve deciBel problems
W560.xls
         
SsbTxPower1 page
Measuring SSB transmitter power
         
RfPowerTerms2 pages
RF power terms
What is RF Peak Envelope Power (PEP)
         
SquareWave1 page
Total Harmonic Distortion of a square wave
         
frequencycalibration2 pages
Easy frequency calibration check on modern transceivers
Making sense of the frequency readout on transceivers
         
twotone1 page
Using audio spectrum analysis for end to end linearity testing of a SSB transmitter / receiver
         
noise11 pages
Measuring noise with an AM receiver
Thoughts on Doug Smith's "Improved Dynamic-Range Testing"
Wade's statistical nature of noise
Headroom in white noise measurements
Uncertainty of the noise sampling process
Expected ambient noise level
Radio noise measures
Accuracy of narrowband audio noise measurements with a digital multimeter
FSAmbientNoise.pdf
FSAmbientNoise01.pdf
FSAmbientNoise02.pdf
         
SMA1 page
SMA essentials
         
NoiseBridge4 pages
ARRL Noise Bridge worked example reworked
RX1 Noise Bridge - VK1OD build
RX1 Noise Bridge improvement
NoiseBridgeRScale.pdf
              
cs011 page
Noise bridge measurement case study - shortened vertical monopole matching
              
cs021 page
Noise bridge measurement case study - Bowral dipole
         
m2m1 page
Dangerous male to male power adapters
         
AA1 page
Antenna analyser accuracy on extreme impedances
         
enb3 pages
Measure IF Bandwidth
IC7400.txt
Ic7400Filter.xls
         
nfisa1 page
Noise Figure inferences of spectrum analysis of weak signals
    
tx1 page
VK1OD Theme page: Transmitters
         
RFPATPC2 pages
RF Power Amplifier Tube Performance Computer
RFPATPC%20-%20pre2007.xls
         
concept7 pages
ATU efficiency – an example
Feeding multiband dipoles with open wire feeder and balun
Spectral content of anode current in Class B/AB RF amplifier
Envelope Distortion in SSB AM
Link coupling transformation ratio
Pi coupling a single ended valve RF Power Amplifier
Spoiling Class B
              
TappedCoil1 page
Tapping an air cored RF inductor
              
TriodeClassB1 page
Designing the operating point for a grounded grid Triode Class B RF amplifier
              
ClassBEff1 page
Effect of reduced drive on Class B amplifier efficiency
         
AL811H2 pages
Ameritron AL811H tube selection
Optimum length of exciter - HPA interconnect cable
         
AmPwmFilter1 page
Filtering a PWM amplitude modulator
         
30L11 page
Collins 30L-1 and AM
         
misc4 pages
Power rating of the BLF278 in class AB
Power rating of the BLF248 in class AB
Thoughts on improvements to the PA0V 144MHz BLF278 amplifier output circuit
Transmit ALC and RF Power Amplifiers
         
FL2100Z1 page
Yaesu FL2100Z
         
DtrPtt1 page
DTR - PTT interface adapter
         
GS31B1 page
Designing with the GS31B
         
GI7B1 page
Designing with the GI7BT
         
FilamentManagement1 page
Filament management in Amateur Radio applications
         
itds1 page
Interpretation of transmitting triode valve data sheets for RF power amplifiers
    
rx1 page
VK1OD Theme page: Receivers
         
gt2 pages
Effective use of a Low Noise Amplifier on VHF/UHF
GT.xls
              
144options1 page
Exploration of options for 144MHz SSB station at VK1OD
              
144LNA1 page
144MHz low noise amplifier performance in the real world
         
noise1 page
Noise and receivers
         
mslnas1 page
Making sense of LNA specifications
         
misc1 page
Effect of receiver mismatch on line loss and system noise performance
         
Codan70041 page
Codan 7004 - WSPR 40m
         
SMeter1 page
S meter calibration and scale shape
         
PowerMeter1 page
Measuring RF power with an SSB receiver
    
equipment1 page
VK1OD Theme page: Hardware
         
LiPower1 page
Lithium Polymer batteries for ham radio applications
         
FDC1 page
Feidaxin FD-460UH report
         
ic70001 page
IC-7000 evaluation
         
FT90R1 page
Yaesu FT-90R Squelch Report
         
6ppp1 page
Serious hazard of common 6 pin DC power connector on ham transceivers
         
ID-Omatic1 page
N0XAS ID-O-Matic - VK1OD implementation
         
Thunderbolt2 pages
Thunderbolt GPS Disciplined Oscillator - VK1OD implementation
GpsDoArtwork.pdf
         
EP6132 pages
Fan controller for Manson EP-613 / Jaytech MP-3082 with fan
Manson EP-613 / Jaytech MP-3082 improvement
         
VK3XDK-10GHz1 page
Thinking aloud on the VK3XDK 10GHz transverter receiver performance
         
DM780-TS42 pages
Compatibility of HRD/DM780 with Digi Portserver TS4
HHD Software Serial Monitor HTML Export
         
MS65141 page
Mastech MS6514 review
         
AL80Bcooling1 page
AL80B cooling
         
FM9004 pages
FM900 - EPROM for 2m band in the Southern Highlands
FM900-SH.pdf
SH.TXT
SHC.TXT
         
KG-UV920P1 page
KG-UV920P - a repair / support story
    
blog 1340 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
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
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