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Homepage Last updated: 2017, May 26
Total pages: 2345

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blog1945 pages
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Owen – Page 68 – owenduffy.net
Transmission lines – Page 18 – owenduffy.net
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Amateur Radio – Page 48 – owenduffy.net
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January 2017 – Page 2 – owenduffy.net
Owen – Page 69 – owenduffy.net
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Antennas – Page 28 – owenduffy.net
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Owen – Page 70 – owenduffy.net
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Amateur Radio – Page 49 – owenduffy.net
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Owen – Page 71 – owenduffy.net
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Computing – Page 5 – owenduffy.net
Electronics – Page 14 – owenduffy.net
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March 2017 – Page 2 – owenduffy.net
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Amateur Radio – Page 50 – owenduffy.net
Antennas – Page 29 – owenduffy.net
Owen – Page 72 – owenduffy.net
Transmission lines – Page 19 – owenduffy.net
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April 2017 – Page 2 – owenduffy.net
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Small Transmitting Loops – Page 7 – owenduffy.net
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Antennas – Page 30 – owenduffy.net
Telecommunications – Page 2 – owenduffy.net
Owen – Page 73 – owenduffy.net
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Amateur Radio – Page 51 – owenduffy.net
Maker – Page 9 – owenduffy.net
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Owen – Page 74 – owenduffy.net
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May 2017 – Page 2 – owenduffy.net
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wp-includes1 page
wlwmanifest.xml
         
wp-content
              
uploads
                   
2014
                        
101 page
VHF-APRS-traffic-study-VK2OMD-3-11_10_2014-.pdf
                        
051 page
VSWRCurveDerivation.pdf
                        
011 page
RogerBeep.pdf
                   
2015
                        
021 page
VHF-APRS-traffic-study-VK2OMD-3-08_02_2015-.pdf
                        
101 page
config.txt
    
equipment1 page
VK1OD Theme page: Hardware
         
LiPower1 page
Lithium Polymer batteries for ham radio applications
         
KG-UV920P1 page
KG-UV920P - a repair / support story
         
EP6132 pages
Fan controller for Manson EP-613 / Jaytech MP-3082 with fan
Manson EP-613 / Jaytech MP-3082 improvement
    
calc44 pages
Noise measurement uncertainty calculator
Field strength / receive power converter
Receiver sensitivity / noise figure / noise factor / noise floor converter
Noise Figure Y factor method calculator
Calculator to support Manual Testing of Field-Strength Levels Using Conventional Receivers
Ambient noise calculator
Antenna Factor of short tuned vertical with concentrated loading
SG / Brix / Plato / Baume calculator
Characteristic impedance of transmission line of two square conductors in air
RX1, RX2 Noise bridge calculator
Generic noise bridge calculator
Calculate initial load line of valve RF amplifier
Calculate RF amplifier pi coupler
Measuring RF impedance by the three voltmeter method
Convert Vpk-Vpp-Vrms-dBV-dBu-mW-dBm
Calculate braid coverage
T Match efficiency estimator
Calculate ferrite cored inductor - rectangular cross section
Calculate ferrite cored inductor - circular cross section
Calculate ferrite cored inductor (from Al)
Skin depth calculator
Student's t test calculator
Factorise integer
Convert Antenna Factor and Gain
Mismatch Loss calculator
Folded dipole step up ratio calculator
Calculate small loop Antenna Factor
Calculate small transmitting loop gain from bandwidth measurement
Calculate Antenna Q from VSWR bandwidth measurement
Calculate VSWR and Return Loss from Zload and Zo
Find R,|X| from VSWR,|Z|,Ro
Calculate cooking time for soft boiled egg
Two point thermistor calibration
Wire DC resistance calculator
Calculate efficiency of vertically polarised antenna from far field strength
Calculate VSWR and Return Loss from Zload (or Yload or S11) and Zo
Calculate Vmax, Vmin, Imax, Imin for lossless line from Zload (or Yload) and Zo
Calculate transmission line Matched Line Loss from Rin of o/c or s/c resonant section
Calculate luminous flux (lm) from luminous intensity (cd) and apex angle (°)
Find |Z|,R,|X| from VSWR,|Z|,R,X,Ro
Estimate Matched Line Loss from paired VSWR measurements
Calculate length of helix of round wire
Velocity factor solver
Calculate G/T from Sun noise Y measurement
         
qsrf1 page
Quiet sun radio flux interpolations
         
awcc1 page
Antenna wire catenary calculator
         
tl12 pages
VSWR calculator
Calculate Vpk and Irms for given power at complex load
RF Two Wire Transmission Line Loss Calculator
RF Arbitrary Transmission Line Loss Calculator
RF Coaxial Transmission Line Loss Calculator
RF Round Wire Inductance Calculator
ATLLC Examples
VSWR calculator help
vswr.pdf
TWLLC help
RF Arbitrary Transmission Line Loss Calculator
TLLC help
    
files11 pages
NoiseMeasurementUncertainty.pdf
EstimateZFerriteToroidInductor.pdf
GuanellaBalun01.pdf
AvoidingFlashoverInBalunsAndAtus.pdf
DirectionalWattmeter.pdf
An%20analysis%20of%20current%20flow%20at%20the%20end%20of%20shielded%20twin%20line%20at%20radio%20frequencies.pdf
MllFromZin.pdf
Counterpoise.pdf
SilverAlkalineCells.pdf
CoaxTrap01.pdf
NoiseAndReceivers.pdf
         
aprx21 pages
Index of /files/aprx
Index of /files/aprx
Index of /files/aprx
Index of /files/aprx
Index of /files/aprx
builds.txt
tncx-rst.expect
tncx-init.expect
tnc2-rst.expect
tnc2-init.expect
tf-rst.expect
tf-init.expect
log.expect
links
kiss-rst.expect
kiss-init.expect
Index of /files/aprx
Index of /files/aprx
Index of /files/aprx
Index of /files/aprx
aprx_2.09.652_armhf.changes
    
measurement
         
enb3 pages
Measure IF Bandwidth
IC7400.txt
Ic7400Filter.xls
         
noise4 pages
Expected ambient noise level
FSAmbientNoise.pdf
FSAmbientNoise01.pdf
FSAmbientNoise02.pdf
    
antenna1 page
VK1OD Theme page: Antenna
         
m402 pages
Estimating Antenna Factor for a MobileOne M40 helical whip
Adjusting a short helically loaded HF vertical
         
SmallUntunedSquareLoop8 pages
Small untuned single turn square loop for field strength measurements
Loop.xls
loop.nec
loop-nec2.pdf
Small square un-tuned loop for field strength measurement - NEC models
Loop1000.tab
Loop600.tab
Loop600.pdf
         
PA0RDT-MiniWhip2 pages
How DOES the PA0RDT Mini-Whip work
How DOES the PA0RDT Mini-Whip work
         
80mVertical1 page
Exploration of a design for an 80m vertical antenna - Part I
         
BowralG5RV2 pages
Bowral G5RV for local contacts
G5RV according to G5RV
         
iobr1 page
The importance (or not) of being resonant
         
InvertedL1 page
Inverted L for HF
         
AT2K1 page
Palstar AT2K
         
ATR301 page
Ameritron ATR-30
         
W5GI1 page
De-mystifying the W5GI Mystery Antenna
         
ccps5 pages
An exploration of a cophased collinear array with coax phasing stubs
tl1.nec
tl2.nec
tl3.nec
tl4.nec
         
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
    
module
         
atpa1 page
AVR ATTiny programming adapter
         
hcctl1 page
Generic heating / cooling controller
         
icm2 pages
Measuring common mode current
Icm40.pdf
         
PllLdr3 pages
MCU to load PLL configuration registers
PllLdr - EEPROM data structure
Synthesisers and external reference clocks
              
cs011 page
PllLdr application - AD9850
              
cs021 page
PllLdr application - AD9850/51 300Bd FSK
              
cs031 page
PllLdr application - BH1415F
              
Picaxe1 page
Picaxe PLL loaders
              
files2 pages
PllLdr.hex
PllLdr-tx5.hex
              
cs041 page
PllLdr application - Si4133G (VK3XDK Agile PLL)
              
cs051 page
PllLdr application - Si4133GT (VK3XDK Agile PLL V2)
         
parot1 page
Power Amplifier Run On Timer (PAROT)
              
files3 pages
parot.hex
10s.parot
180s.parot
         
pik3 pages
PIK - PIC Iambic Keyer
PIK timing
pik011.pdf
              
VK3XU1 page
VK3XU's PIK with integral iambic paddles
         
rb4 pages
Roger Beep
Roger Beep - tone waveform development
Roger Beep - older firmware versions
Roger Beep - kit contents and construction notes
              
IC70002 pages
Roger Beep - IC7000 + HM-151 installation notes
Roger Beep - IC7000 + Traveller headset installation notes
              
IC9101 page
Roger Beep - IC910 installation notes
              
MC801 page
Roger Beep - MC80 installation notes
              
SM81 page
Roger Beep - SM8 installation notes
              
TS20001 page
Roger Beep - TS2000 installation notes
         
TuneMate3 pages
TuneMate for Icom transceivers
icah4e002.pdf
icah4e001.pdf
         
smbk8 pages
Simple Morse beacon keyer
Another simple Morse beacon keyer - basic, but accurate
Simple Morse beacon keyer - EEPROM data structure
Simple Morse beacon keyer - onair
Simple Morse beacon keyer - using ATB
Another Morse beacon keyer - A/B RF switching
Improving weak signal identification of FSK beacons
Morse beacon keyer for a cluster of transmitters
              
files4 pages
QrssBeacon-m168.hex
QrssBeacon-tx4.hex
QrssBeacon-tx5.hex
QrssBeacon-tx5x.hex
         
FlashTnc2 pages
Flash TNC
flashtncartwork.pdf
         
ic93501 page
Icom - 9350 / 3040 Protocol Converter (ic9350)
         
QrssTx3 pages
QRP QRSS Beacon Transmitter - on air
QRP QRSS Beacon Transmitter
QRSS observation utilities
         
dc2 pages
12V DC distribution in car for radio applications - 2005
Anderson Power Poles for 12VDC radio applications
    
map8 pages
20160630
20160204
20151028
20151029
VK4MQ+VK2OL-2015
20160111
AprsDup2
20160305
    
pub2 pages
TuneMateForIcomTransceivers.pdf
RogerBeep.pdf
    
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
         
VSWR17 pages
VSWR Myths
Additional loss due to VSWR
Power in a mismatched transmission line
VSWR and displacement
VSWR measurement
VSWR FAQ
MisMatch Loss given VSWR
Comment on W6VAT article on VSWR
Is Zs of a HF ham tx typically 50+j0?
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
         
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
         
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
         
TE1 page
Telegrapher's Equation
         
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
         
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
         
QWVmatch1 page
Matching a quarter wave vertical using TL elements
         
3001 page
300 ohm transmitting ladder line
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