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Homepage Last updated: 2012, February 3
Total pages: 429

3 pages
VK1OD on the 'net
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VK1OD on the 'net
    
reference 3 pages
Definition of Amateur Radio
VK1OD Theme page: Reference
Bootlace Terminals
         
137.700Beacon 1 page
137.7kHz QRSS on one chip
         
smbk 2 pages
Improving weak signal identification of FSK beacons
Simple Morse beacon keyer
         
DtrRtsInterface 1 page
DTR / RTS interface unit
         
PllLdr 1 page
MCU to load PLL configuration registers
              
cs02 1 page
PllLdr application - AD9850/51 300Bd FSK
              
cs01 1 page
PllLdr application - AD9850
              
Picaxe 1 page
Picaxe PLL loaders
         
CpldPll 1 page
An experimental CPLD based PLL
         
PA0KLTSynth 1 page
PA0KLT Si570 Synthesiser - VK1OD implementation
         
440HzRef 1 page
440Hz (A4, A440) reference oscillator
         
137700Osc 1 page
137.7kHz oscillator
         
1kHzRef 1 page
1kHz reference oscillator
         
hdt2 1 page
Heater Delay Timer
         
rb 4 pages
Roger Beep
Roger Beep - tone waveform development
Roger Beep - older firmware versions
Roger Beep - kit contents and construction notes
              
SM8 1 page
Roger Beep - SM8 installation notes
              
IC7000 2 pages
Roger Beep - IC7000 + HM-151 installation notes
Roger Beep - IC7000 + Traveller headset installation notes
              
IC910 1 page
Roger Beep - IC910 installation notes
              
MC80 1 page
Roger Beep - MC80 installation notes
              
TS2000 1 page
Roger Beep - TS2000 installation notes
         
ic9350 1 page
Icom - 9350 Protocol Converter
         
dc 2 pages
12V DC distribution in car for radio applications - 2005
Anderson Power Poles for 12VDC radio applications
         
PepAmp 3 pages
Peak amplifier for an RF wattmeter
Peak amplifier for Drake W4 directional wattmeter
PeakAmpSchematic.pdf
         
hdt 1 page
Heater Delay Timer
         
EA78Accukeyer 1 page
EA 1978 Accu-keyer improvements
         
crd 1 page
Coax Relay Driver
         
SoundCardPreamp 1 page
Sound card microphone preamplifier
         
TuneMate 2 pages
TuneMate for Icom transceivers
icah4e001.pdf
         
pik 3 pages
PIK - PIC Iambic Keyer
PIK timing
pik001.pdf
              
VK3XU 1 page
VK3XU's PIK with integral iambic paddles
         
rpi 2 pages
Radio Programming Interface
rpipanel.pdf
         
TncAudioBob 1 page
TNC Audio Break-Out-Box
         
Echolink 1 page
Echolink interface unit
         
SpkrHiPass 1 page
High Pass speaker filter for CTCSS suppression
         
g2c 1 page
GPIB to Centronics Protocol Converter
         
SCAmmeter 1 page
Silicon Chip Automotive Ammeter (June 2002) - mods
         
PhoneFilter 1 page
Simple RF filter for telephone line
         
mdmrst 1 page
Mdmrst
         
HAPN 1 page
Fitting a HAPN 4800 board to a Paccomm Tiny 2 Mk II
         
FlashTnc 2 pages
Flash TNC
flashtncartwork.pdf
         
VkPowermate 1 page
VKPowermate II
         
AH4-AT300 1 page
AH4-AT300 Protocol Converter
    
antenna 1 page
VK1OD Theme page: Antenna
         
concepts 2 pages
Effective Radiated Power (ERP)
Antenna Effective Aperture
         
m40 2 pages
Adjusting a short helically loaded HF vertical
Estimating Antenna Factor for a MobileOne M40 helical whip
         
133nobrainer 1 page
Is the 133' centre fed multiband dipole a no-brainer
         
W5dxpCoilExp 1 page
Comment on W5DXP's 2011 coil measurement experiment
         
NEC 1 page
Exploitation of NEC's GM card
         
FiveEighth 1 page
Matching a 5/8λ vertical
         
misc 10 pages
In pursuit of dipole resonance with an MFJ259B
Learning models or a poor workman always blames his tools
Counterpoise - what does it mean?
A simple explanation of the so called current forcing property of a quarter wave transmission line
Optimising a coax fed half wave dipole
Minimum length of a non-resonant multi-band dipole
The Beta or Hairpin Match
Shielded station earth conductor
An explanation of the Comet CHA250
Corrosion protection of antenna connections
         
coaxtrap 7 pages
Bootstrap coax traps for antennas
Comment on QEX article - "Coaxial Traps for Multiband Antennas, the True Equivalent Circuit"
CoaxialTrapsforHFAntennas.pdf
CoaxTrapImpedance.pdf
A trapped dipole for 80m and 40m using bootstrap coax traps
Bootstrap coax traps for antennas - DG1MFT measurements
D-0364.txt
         
G4CQM50Dipole 2 pages
G4CQM 50Ω coaxial dipole
G4CQM 50Ω coaxial dipole - NEXTGENF.ANT study
         
dlv 1 page
Dipole loaded vertical coax feed line
         
7MDipole 2 pages
Bowral 7MHz dipole for local contacts
An antenna for 7MHz local contacts
         
FoldedDipole 1 page
Folded Half Wave Dipole
         
HalfFoldedDipole 1 page
Half Folded Half Wave Dipole
         
StationMaster 1 page
StationMaster on 40m
         
80mVertical 1 page
Exploration of a design for an 80m vertical antenna - Part I
         
DoubleBazooka 1 page
Double Bazooka Antenna performance
         
dl6wu 3 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
         
iobr 2 pages
The importance (or not) of being resonant
The importance (or not) of being resonant
         
arrm 1 page
Amateur Radio Magazine reinforces antenna resonance myth
         
aabtnaaa 1 page
Is any antenna better than no antenna at all?
         
conductors 1 page
Loss in antenna conductor materials
         
14MDipole 1 page
14MHz Inverted Vee Dipole
         
buddipole 1 page
Field strength measurement - Buddipole and FSM
         
G5RV 2 pages
Feeding a G5RV
Optimising a typical G5RV
         
PY2RML 1 page
N4UJW / PY2RML Ham Universe short dipole
         
VK1ZKD-7MDipole 1 page
7 MHz Dipole at VK1ZKD
         
cobra 2 pages
NEC model of the Cobra antenna
nec.txt
         
W5GI 2 pages
De-mystifying the W5GI Mystery Antenna
De-mystifying the W5GI Mystery Antenna
         
ccps 1 page
An exploration of a cophased collinear array with coax phasing stubs
         
4over4 1 page
Four over Four for 144MHz
         
GammaMatch 2 pages
Novel Gamma Match Construction
gamma.pdf
         
VB214 1 page
Refurbishing a Hy-gain 2meter 14 element beam (214, VB-214)
         
InvertedL 1 page
Inverted L for HF
         
multibandunloadedvertical 3 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
         
NaroomaEFW 1 page
Narooma End Fed Wire
         
atcc 2 pages
Antenna Tuner Calibration Chart
atcc.pdf
         
H4BTV 1 page
Hustler 4BTV Report
         
suw 1 page
Electrically short unloaded whips on vehicles
         
SmallUntunedSquareLoop 5 pages
Small untuned single turn square loop for field strength measurements
Small square un-tuned loop for field strength measurement - NEC models
loop-nec2.pdf
Loop600.pdf
Small untuned single turn square loop for field strength measurements
         
ATU 2 pages
Estimating T match ATU efficiency
Adjusting a T match ATU for best efficiency
         
D130 1 page
Diamond D130 Discone
         
post 3 pages
Antenna mast for experimental use
Earthing system at VK1OD
Driving earth rods
         
MI5104 1 page
Jaycar MI5104 inverter
         
genset 1 page
A medium priced generator set from eBay
         
RCD 1 page
Portable generator sets and RCD protection for Amateur Radio field stations
         
Qrp2000 1 page
QRP2000 Synthesiser
    
transmissionline 6 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
         
concept 4 pages
Insertion Loss vs Transmission Loss
Estimating parameters of two wire transmission lines
Does twisting a two wire open line reduce radiation
Modelling practical transmission lines
         
ZL1AN 1 page
ZL1AN's transmission line challenge
         
VSWR 15 pages
Is Zs of a HF ham tx typically 50+j0?
A test of Zs on an IC7000
Return Loss
Misunderstanding VSWR misleads
Does SWR damage HF ham transmitters?
MisMatch Loss given VSWR
VSWR and displacement
VSWR measurement
VSWR Myths
VSWR FAQ
Additional loss due to VSWR
Comment on W6VAT article on VSWR
Power in a mismatched transmission line
A simple VSWR analysis without mirrors
Accuracy of VSWR meters at high sensitivity
         
aev 1 page
Avoiding flashover in baluns and ATUs
         
TE 1 page
Telegrapher's Equation
         
fig8 2 pages
Figure-8 flex used as RF transmission line
PVC insulated feed line on HF
         
getl 1 page
A graphical explanation of energy flow in a practical transmission line
         
RG6 1 page
RG-6/U for transmitting applications
         
stcm 1 page
An analysis of current flow at the end of shielded twin line at radio frequencies
         
LOLL 4 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
         
QWVmatch 1 page
Matching a quarter wave vertical using TL elements
         
300 1 page
300 ohm transmitting ladder line
    
FM 3 pages
Amateur Radio application of Frequency Modulation
Setup of FM tx for broadcast relay from a digital audio source
Passive Direct Inject Box
         
AfskFmSetup 1 page
Setup of an FM AFSK transmitter
         
VhfAprs 1 page
APRS AFSK on VHF
         
afskoverload 1 page
AFSK - effect of overload of tx audio input
         
LinkedRepeaters 1 page
Linked repeaters - siqnal quality
    
calc 17 pages
T Match efficiency estimator
Calculate braid coverage
Convert Vpk-Vpp-Vrms-dBV-dBu-mW-dBm
Measuring RF impedance by the three voltmeter method
Calculate RF amplifier pi coupler
Calculate initial load line of valve RF amplifier
Generic noise bridge calculator
RX1, RX2 Noise bridge calculator
Receiver sensitivity / noise figure / noise factor / noise floor converter
Antenna Factor of short tuned vertical with concentrated loading
Characteristic impedance of transmission line of two square conductors in air
Noise measurement uncertainty calculator
Ambient noise calculator
Noise Figure Y factor method calculator
Field strength / receive power converter
Calculator to support Manual Testing of Field-Strength Levels Using Conventional Receivers
SG / Brix / Plato / Baume calculator
         
tl 12 pages
Calculate Vpk and Irms for given power at complex load
ATLLC Examples
RF Arbitrary Transmission Line Loss Calculator
RF Transmission Line Loss Calculator
TLLC help
RF Two Wire Transmission Line Loss Calculator
vswr.pdf
VSWR calculator
EMR MPE standards compliance evaluation tool
TWLLC help
VSWR calculator help
EMR MPE standards compliance evaluation tool usage notes
         
awcc 1 page
Antenna wire catenary calculator
         
qsrf 1 page
Quiet sun radio flux interpolations
         
dbc 1 page
Distance and bearing calculator
         
bplc 2 pages
BPL interference evaluation tool usage notes
BPL interference evaluation tool
    
equipment 1 page
VK1OD Theme page: Hardware
         
ID-Omatic 1 page
N0XAS ID-O-Matic - VK1OD implementation
         
FDC 1 page
Feidaxin FD-460UH report
         
ic7000 1 page
IC-7000 evaluation
         
FT90R 1 page
Yaesu FT-90R Squelch Report
         
6ppp 1 page
Serious hazard of common 6 pin DC power connector on ham transceivers
    
software 1 page
Theme page: Calculators, Software
         
fsm 8 pages
FSM Home Page
Accuracy of the FSM sampling process on noise
FSM Home Page
FSMKeyboardShortcuts.pdf
FSM.pdf
FSM FAQ
FSM support page
FSM Receiver Tests
              
cs 3 pages
FSM case study - Wideband interference on 40m
FSM case study - Ambient noise survey on 40m
20050628212255.txt
                   
03 1 page
Ambient noise survey, Hackett ACT on 40m, 06/03/2009
                   
04 1 page
Ambient noise survey, Bowral NSW on 40m, 13/08/2010
         
nfm 6 pages
NFM Support
NFM Home Page
NFM.pdf
NFM FAQ
NFM Registration
NFM Home Page
              
applications 4 pages
Measuring system G/T ratio using Sun noise
Plotting antenna pattern from Sun noise
Measuring TS2000 Noise Figure using NFM and RFD2305
NFM Applications
         
fsc 4 pages
FSC support page
FSC Home Page
FSC FAQ
Using FSC to calculate EME paths
         
finddr 2 pages
FINDDR
FINDVOL
         
hp 2 pages
Software for HP calculators
VSWR.txt
    
propagation 1 page
VK1OD Theme page: Propagation
         
solar 1 page
Spotless days around solar cycle transition
         
tropo 1 page
Estimating threshold receive power level for WSJT JT65B/KV
         
MtGinini 1 page
Mt Ginini
         
20071125-VK1BL 1 page
QSO - VK1BL/P and VK2FZ on 13cm on 25/11/2007
    
tx 1 page
VK1OD Theme page: Transmitters
         
concept 7 pages
Link coupling transformation ratio
Spoiling Class B
Pi coupling a single ended valve RF Power Amplifier
Spectral content of anode current in Class B/AB RF amplifier
ATU efficiency – an example
Feeding multiband dipoles with open wire feeder and balun
Envelope Distortion in SSB AM
              
TriodeClassB 1 page
Designing the operating point for a grounded grid Triode Class B RF amplifier
              
TappedCoil 1 page
Tapping an air cored RF inductor
         
FilamentManagement 1 page
Filament management in Amateur Radio applications
         
GI7B 1 page
Designing with the GI7BT
         
GS31B 1 page
Designing with the GS31B
         
DtrPtt 1 page
DTR - PTT interface adapter
         
FL2100Z 1 page
Yaesu FL2100Z
         
RFPATPC 1 page
RF Power Amplifier Tube Performance Computer
         
AL811H 2 pages
Ameritron AL811H tube selection
Optimum length of exciter - HPA interconnect cable
         
AmPwmFilter 1 page
Filtering a PWM amplitude modulator
         
30L1 1 page
Collins 30L-1 and AM
         
misc 4 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
    
balun 1 page
VK1OD Theme page: Baluns
         
concept 6 pages
Differential flux leakage in a Guanella 1:1 balun
Definition: Current Balun, Voltage Balun
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
              
cm 2 pages
Can a balun alter the tuning of an antenna system
Baluns in antenna systems
         
application 1 page
A perspective on the popular 4:1 Ruthroff balun at the base of a ground mounted untuned multi-band vertical
         
Guanella 2 pages
A model of a practical Guanella 1:1 balun
Model validation - FT240-61-35t
         
W2DU-LF1260 1 page
A model of the W2DU 1:1 choke balun using Jaycar LF1260 cores
         
W2DU 1 page
A model of the W2DU 1:1 choke balun
         
G1-1-LO1238 1 page
A model of a Guanella 1:1 choke balun using a Jaycar LO1238 core
         
G1-1-LF1260 1 page
A model of a Guanella 1:1 choke balun using two Jaycar LF1260 cores
         
W2DU-LF1258 1 page
A model of the W2DU 1:1 choke balun using Jaycar LF1258 cores
         
gsc 1 page
A review of the Guanella 4:1 balun on a shared magnetic circuit
         
G1-1-FT140-61 1 page
A model of a Guanella 1:1 VHF choke balun using a FT140-61 core
         
inductor 2 pages
Common mode choke design tool
A method for estimating the impedance of a ferrite cored toroidal inductor at RF
         
G1-1-28-053-31 1 page
HF current balun project
         
Ruthroff 2 pages
A model of a practical Ruthroff 1:4 Unun
A model of a practical Ruthroff 1:4 balun
    
measurement 5 pages
Using my Excel cubic spline interpolation functions
VK1OD Theme page: Measurement
Improved resolution of relative power measurement using a directional wattmeter
Digitising published graphs of component characteristics
Measuring average or mean power of a complex radio frequency wave
         
NoiseBridge 4 pages
RX1 Noise Bridge improvement
RX1 Noise Bridge - VK1OD build
ARRL Noise Bridge worked example reworked
NoiseBridgeRScale.pdf
              
cs02 1 page
Noise bridge measurement case study - Bowral dipole
              
cs01 1 page
Noise bridge measurement case study - shortened vertical monopole matching
         
icm 2 pages
Measuring common mode current
Icm40.pdf
         
SsbTxPower 1 page
Measuring SSB transmitter power
         
RfPowerTerms 2 pages
RF power terms
What is RF Peak Envelope Power (PEP)
         
SquareWave 1 page
Total Harmonic Distortion of a square wave
         
frequencycalibration 2 pages
Easy frequency calibration check on modern transceivers
Making sense of the frequency readout on transceivers
         
twotone 1 page
Using audio spectrum analysis for end to end linearity testing of a SSB transmitter / receiver
         
noise 9 pages
Measuring noise with an AM receiver
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
         
SMA 1 page
SMA essentials
         
enb 2 pages
Measure IF Bandwidth
IC7400.txt
         
nfisa 1 page
Noise Figure inferences of spectrum analysis of weak signals
    
misc 4 pages
DHL shipment performance
Electronic fluorescent light starters
QRZ forums
Antennex publishes Owen Duffy?
         
937+ 1 page
A review of the Aoyue 937+
    
rx 1 page
VK1OD Theme page: Receivers
         
Codan7004 1 page
Codan 7004 - WSPR 40m
         
noise 1 page
Noise and receivers
         
gt 1 page
Effective use of a Low Noise Amplifier on VHF/UHF
              
144options 1 page
Exploration of options for 144MHz SSB station at VK1OD
              
144LNA 1 page
144MHz low noise amplifier performance in the real world
         
mslnas 1 page
Making sense of LNA specifications
         
misc 1 page
Effect of receiver mismatch on line loss and system noise performance
    
rigging 9 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
Wire Table
Comparison of observation of actual span with calculated model
         
tree 1 page
Rigging wire antennas in trees
    
other 3 pages
VK1OD Theme page: Other
HTML 4.0 Entities for Symbols and Greek Letters
Chinese concrete mixer performance
              
200805 1 page
TS2000 audio setup - May 2008
              
200806 1 page
TS2000 audio setup - June 2008
         
legend 1 page
Legendary microphones for ham radio
    
files 3 pages
ATC.pdf
AmateurRadioLog.pdf
5mmGridA4.pdf
    
bpl 14 pages
Theme page: Broadband over Power Lines
Theme page: Broadband over Power Lines
An introduction to Broadband over Power Lines
Are you ready for BPL enablement of your home and neighbourhood?
ManagementOfInterferenceFromBpl-OwenDuffy.pdf
Observations of ambient noise / emissions at Jerrabomberra - April 2007
Hobart BPL Trial -  11-12 January 2007
Country Energy BPL Trial Oct - Febuary 2004
Woomera BPL Trial Oct - Dec 2004
Queanbeyan BPL Trial Mar 2005
Queanbeyan BPL Trial Nov 2004
Ionospheric propagation of BPL emissions
How much radiated power does it take to create an S9 signal?
Comparison of the proposed CENELEC standard and existing US FCC 15.209 on HF Amateur Bands
         
flexnet 5 pages
VK1CAE Experimental FlexDigi Node
flexnode.pdf
Resources for Flexnet trial
TFPCX
6PACK HUB
    
traffic 7 pages
Telephony Traffic
Erlang B traffic model
Erlang C queue model
Poisson traffic model
Binomial traffic model
Traffic unit converter
Telephony Traffic
    
recipe 14 pages
Concrete ingredients calculator
Favourite Recipes
Shortcrust Pastry
Biscuit Pastry
Choux Pastry
Pasta - Basic
Plain Scones
Date Scones
Pizza Dough
White Bread
Generic Jam recipe
Lemon Myrtle Couscous
Balsamic sweet and sour dipping sauce / glaze
Tidbits
         
FAQ 2 pages
Recipe FAQ
Endpoint to boiling a sugar solution
         
LemonadeMarmalade 1 page
Lemonade Marmalade
         
misc 1 page
Olive oil calibration of refractometer
    
CQVK 3 pages
CQVK
CQVKAcaSubmission20031030.pdf
Australian amateur population trends 1998 - 2008
    
piano 1 page
A piano repair story
         
traffic 2 pages
Erlang C FAQ
Telephony Traffic