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owenduffy.net index
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- grabber/3 pages
- QRSS grabber @ VK2OMD
- Grabber case studies
- Making inferences from QRSS grabber observations
- - ISP/
  - cs01/1 page
  - An A/B comparison on 40m over a 14,700km path using QRSS
  - cs02/1 page
  - An A/B comparison on 40m over a 17,000km path using QRSS
  - cs03/1 page
  - A comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
  - cs04/1 page
  - A comparison of a 40m quarter wave verticals with elevated radials and horizontal dipole over a 14,700km path using QRSS
  - cs05/1 page
  - Distribution of S/N ratio under fading on HF
  - cs06/1 page
  - Another comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
  - cs07/1 page
  - Yet another comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
  - cs08/1 page
  - VK1KW QRSS beacon on 2m 15/01/13
  - SLCapture/1 page
  - Capturing QRSS3 with Spectrum Lab
  - cs10/1 page
  - A comparison of a G5RV at VK1OD and QW vertical at VK2DVK on 40m over a 14,700km path using QRSS
- rc/1 page
- Theme page: Radio control model technology
- - BLDC/1 page
  - Sensorless brushless DC motor - an explanation
  - Motors/
  - - T2211-2300/1 page
    - Turnigy 2211-2300 brushless DC motor
    - T2730-1500/1 page
    - Turnigy 2730-1500 brushless DC motor
  - ESC/
  - - Afro30/1 page
    - Afro30 30A ESC
    - BS12/1 page
    - Blue series 12A ESC
    - BS20/1 page
    - Blue series 20A ESC
    - HK261000001/1 page
    - Hobbyking 261000001 ESC - flashing alternate firmware
    - HK261000002/1 page
    - Hobbyking 261000002 ESC - flashing alternate firmware
    - F20A/1 page
    - Hobbyking F-20A 20A ESC
    - F30A/1 page
    - Hobbyking F-30A 30A ESC
    - F40A/1 page
    - Hobbyking F-40A 40A ESC
    - RB70A/1 page
    - HobbyKing Red Brick 70A ESC (Opto)
    - 9261000003/1 page
    - Hobbyking 9261000003 40A ESC
    - Rctimer20A/1 page
    - Rctimer 20A ESC
    - SBEC-26V/1 page
    - Turnigy 5A 26V SBEC (SBEC-26V)
    - Multistar10/1 page
    - Turnigy Multistar 10A ESC
    - ZtwA12/1 page
    - ZTW A series 12A ESC
  - EscProgrammingCard/1 page
  - ESC programming cards
  - aircraft/
  - - X230/1 page
    - X230 quadcopter
    - F330-01/2 pages
    - F330 quadcopter (10/11/2013 build)
    - WinMerge File Compare Report
    - F330-02/1 page
    - F330 quadcopter (1/12/2013 build)
    - SK450-01/2 pages
    - SK450 quadcopter (10/11/2013 build)
    - WinMerge File Compare Report
    - X450-01/1 page
    - X450-01 quadcopter (10/11/2013 build)
    - X900-01/2 pages
    - X900 tricopter (20/01/2014 build)
    - WinMerge File Compare Report
    - F330-03/1 page
    - F330 quadcopter (25/04/2014 build)
    - X450-02/1 page
    - X450-02 quadcopter (21/05/2014 build)
    - Q450-01/2 pages
    - Q450 quadcopter (15/03/2015 build)
    - diff report
    - Q450-02/1 page
    - Q450 quadcopter (15/10/2015 build)
    - Q450-03/1 page
    - Q450 quadcopter - Q21 (15/12/2015 build)
    - Q450-Q21/1 page
    - Q450 quadcopter - Q22 (30/06/2016 build)
    - X450-03/1 page
    - X450-03 quadcopter - Q11 (19/03/2015 build)
    - X450-Q11-04/1 page
    - X450-04 quadcopter - Q11 (10/01/2017 build)
    - Q450-Q21-02/1 page
    - Q450 quadcopter - Q22 (30/06/2016 build)
    - Q450-Q22/1 page
    - Q450 quadcopter (30/06/2016 build)
  - Programming/
  - - HkUsbasp/1 page
    - Hobbyking USBasp AVR programmer
  - accessories/
  - - asrg/1 page
    - Arduino servo ramp generator
  - tools/1 page
  - Calculate SimonK BLDC timing parameters
- traffic/8 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
- software/1 page
- Theme page: Calculators, Software
- - nfm/7 pages
  - NFM Home Page
  - NFM Support
  - NFM FAQ
  - NFM Registration
  - NFM Home Page
  - NfmFunctions.xls
  - NFM.pdf
  - fsm/8 pages
  - FSM Home Page
  - FSM Home Page
  - Accuracy of the FSM sampling process on noise
  - FSMKeyboardShortcuts.pdf
  - FSM.pdf
  - FSM FAQ
  - FSM support page
  - FSM Receiver Tests
  - - cs/6 pages
    - FSM case study - Wideband interference on 40m
    - FSM case study - Ambient noise survey on 40m
    - 20050628.xls
    - 20050628212255.txt
    - 20050628212255.grf
    - NoiseSurveyFSMData.xls
    - - 03/2 pages
      - Ambient noise survey, Hackett ACT on 40m, 06/03/2009
      - FsmData.xls
      - 04/2 pages
      - Ambient noise survey, Bowral NSW on 40m, 13/08/2010
      - FsmData.xls
  - finddr/2 pages
  - FINDDR
  - FINDDR
  - fsc/4 pages
  - FSC support page
  - FSC Home Page
  - FSC FAQ
  - Using FSC to calculate EME paths
  - hp/3 pages
  - Software for HP calculators
  - VSWR.hp
  - VSWR.txt
  - ATB/2 pages
  - ATB - a bootloader for AVR Tiny microcontrollers
  - Prolific PL-2303 problems
- recipe/21 pages
- Favourite Recipes
- Shortcrust Pastry
- Biscuit Pastry
- Choux Pastry
- Pasta - Basic
- Plain Scones
- Date Scones
- Pizza Dough
- White Bread
- Generic Jam recipe
- Spiced pear paste
- Raghaven's masala
- Tandoori masala
- Taco seasoning
- Homus
- Basil pesto
- Lemon Myrtle Couscous
- Lemon Couscous
- Balsamic sweet and sour dipping sauce / glaze
- Chinese dumpling sauce
- Tidbits
- - LemonadeMarmalade/1 page
  - Lemonade Marmalade
  - FAQ/2 pages
  - Endpoint to boiling a sugar solution
  - Recipe FAQ
  - misc/1 page
  - Olive oil calibration of refractometer
- smg/
- antenna/1 page
- VK1OD Theme page: Antenna
- - concepts/4 pages
  - Antenna Effective Aperture
  - Effective Radiated Power (ERP)
  - Setting up shunt matching with an MFJ259B or the like
  - ShuntMatchGraphs.pdf
  - - dBd/1 page
    - dB, dBi, and dBd
  - 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
  - HalfFoldedDipole/3 pages
  - Half Folded Half Wave Dipole
  - CY-144-4.nec
  - CY-144-4a.nec
  - FoldedDipole/1 page
  - Folded Half Wave Dipole
  - dlv/1 page
  - Dipole loaded vertical coax feed line
  - W8jiCoilExp/1 page
  - Comment on W8JI's 2006 coil measurement experiment
  - GammaMatch/3 pages
  - Designing a Gamma match using a Smith chart
  - Novel Gamma Match Construction
  - gamma.pdf
  - shieldedloop/1 page
  - Small single turn un-tuned shielded loop
  - 14MDipole/1 page
  - 14MHz Inverted Vee Dipole
  - 7MDipole/2 pages
  - An antenna for 7MHz local contacts
  - Bowral 7MHz dipole for local contacts
  - 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
  - 133nobrainer/1 page
  - Is the 133' centre fed multiband dipole a no-brainer
  - BowralG5RV/2 pages
  - Bowral G5RV for local contacts
  - G5RV according to G5RV
  - cobra/2 pages
  - NEC model of the Cobra antenna
  - nec.txt
  - DoubleBazooka/2 pages
  - Double Bazooka Antenna performance
  - 80mDB.nec
  - W5GI/2 pages
  - De-mystifying the W5GI Mystery Antenna
  - De-mystifying the W5GI Mystery Antenna
  - G4CQM50Dipole/2 pages
  - G4CQM 50Ω coaxial dipole
  - G4CQM 50Ω coaxial dipole - NEXTGENF.ANT study
  - W5dxpCoilExp/1 page
  - Comment on W5DXP's 2011 coil measurement experiment
  - ccps/5 pages
  - An exploration of a cophased collinear array with coax phasing stubs
  - tl1.nec
  - tl2.nec
  - tl3.nec
  - tl4.nec
  - 4over4/1 page
  - Four over Four for 144MHz
  - 80mVertical/1 page
  - Exploration of a design for an 80m vertical antenna - Part I
  - X-50A/1 page
  - Diamond X-50A
  - WA6SVT/4 pages
  - NEC Model of WA6SVT Omni-Gain Vertical Collinear for VHF and UHF
  - wa6svt-lmr400-01.nec
  - WA6SVT01.nec
  - wa6svt-lmr400-02.nec
  - scc/1 page
  - Silicon Chip Collinear
  - 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/3 pages
  - Antenna Tuner Calibration Chart
  - atcc.pdf
  - atcc2.pdf
  - H4BTV/1 page
  - Hustler 4BTV Report
  - suw/1 page
  - Electrically short unloaded whips on vehicles
  - StationMaster/1 page
  - StationMaster on 40m
  - FiveEighth/1 page
  - Matching a 5/8λ vertical
  - - cs01/1 page
    - Matching a 5/8λ vertical - example 1
  - SmallUntunedSquareLoop/9 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
  - ATU/2 pages
  - Estimating T match ATU efficiency
  - Adjusting a T match ATU for best efficiency
  - AT2K/1 page
  - Palstar AT2K
  - ATR30/1 page
  - Ameritron ATR-30
  - D130/1 page
  - Diamond D130 Discone
  - post/3 pages
  - Antenna mast for experimental use
  - Earthing system at VK1OD
  - Driving earth rods
  - NEC/1 page
  - Exploitation of NEC's GM card
  - PcCapacitor/1 page
  - PC high voltage RF capacitors
  - PA0RDT-MiniWhip/2 pages
  - How DOES the PA0RDT Mini-Whip work
  - How DOES the PA0RDT Mini-Whip work
  - Innova/1 page
  - InnovAntennas LFA explanation
- balun/1 page
- VK2OMD Theme page: Baluns
- - Guanella/2 pages
  - A model of a practical Guanella 1:1 balun
  - Model validation - FT240-61-35t
  - W2DU/3 pages
  - A model of the W2DU 1:1 choke balun
  - 80mdipole-80.nec
  - 80mdipole-40.nec
  - 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
  - W2DU-LF1260/1 page
  - A model of the W2DU 1:1 choke balun using Jaycar LF1260 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/7 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
  - G1-1-28-053-31/1 page
  - HF current balun project
  - I4BBE/1 page
  - A narrowband current balun using coax line sections
  - Ruthroff/2 pages
  - A model of a practical Ruthroff 1:4 Unun
  - A model of a practical Ruthroff 1:4 balun
  - application/1 page
  - A perspective on the popular 4:1 Ruthroff balun at the base of a ground mounted untuned multi-band vertical
  - G0KSC/1 page
  - The G0KSC hybrid balun
  - DK7ZB/1 page
  - The DK7ZB balun
  - VK5AJL/1 page
  - The VK5AJL bolt balun
- 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
- - 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
  - aev/1 page
  - Avoiding flashover in baluns and ATUs
  - concept/4 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
  - - RelayComp/1 page
    - High frequency compensation of T/R relay
    - MLLvHRL/1 page
    - Estimating Matched Line Loss from Return Loss
    - mvf/1 page
    - Measuring the velocity factor of coaxial transmission line
  - ZL1AN/1 page
  - ZL1AN's transmission line challenge
  - OWLVSWR/1 page
  - The merit of measuring VSWR on an open wire line
  - pcf/1 page
  - Thinking aloud on pipe cap filters
  - folla/1 page
  - The failure of lossless line analysis in the real world
  - 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
  - QWVmatch/1 page
  - Matching a quarter wave vertical using TL elements
  - 300/1 page
  - 300 ohm transmitting ladder line
- measurement/7 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
- - 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
  - SMA/1 page
  - SMA essentials
  - NoiseBridge/4 pages
  - ARRL Noise Bridge worked example reworked
  - RX1 Noise Bridge - VK1OD build
  - RX1 Noise Bridge improvement
  - NoiseBridgeRScale.pdf
  - - cs01/1 page
    - Noise bridge measurement case study - shortened vertical monopole matching
    - cs02/1 page
    - Noise bridge measurement case study - Bowral dipole
  - m2m/1 page
  - Dangerous male to male power adapters
  - AA/1 page
  - Antenna analyser accuracy on extreme impedances
  - nfisa/1 page
  - Noise Figure inferences of spectrum analysis of weak signals
- tx/1 page
- VK1OD Theme page: Transmitters
- - RFPATPC/2 pages
  - RF Power Amplifier Tube Performance Computer
  - RFPATPC%20-%20pre2007.xls
  - concept/7 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
  - - TappedCoil/1 page
    - Tapping an air cored RF inductor
    - TriodeClassB/1 page
    - Designing the operating point for a grounded grid Triode Class B RF amplifier
    - ClassBEff/1 page
    - Effect of reduced drive on Class B amplifier efficiency
  - 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
  - FL2100Z/1 page
  - Yaesu FL2100Z
  - DtrPtt/1 page
  - DTR - PTT interface adapter
  - GS31B/1 page
  - Designing with the GS31B
  - GI7B/1 page
  - Designing with the GI7BT
  - FilamentManagement/1 page
  - Filament management in Amateur Radio applications
  - itds/1 page
  - Interpretation of transmitting triode valve data sheets for RF power amplifiers
- rx/1 page
- VK1OD Theme page: Receivers
- - gt/2 pages
  - Effective use of a Low Noise Amplifier on VHF/UHF
  - GT.xls
  - - 144options/1 page
    - Exploration of options for 144MHz SSB station at VK1OD
    - 144LNA/1 page
    - 144MHz low noise amplifier performance in the real world
  - noise/1 page
  - Noise and receivers
  - mslnas/1 page
  - Making sense of LNA specifications
  - misc/1 page
  - Effect of receiver mismatch on line loss and system noise performance
  - Codan7004/1 page
  - Codan 7004 - WSPR 40m
  - SMeter/1 page
  - S meter calibration and scale shape
  - PowerMeter/1 page
  - Measuring RF power with an SSB receiver
- equipment/1 page
- VK1OD Theme page: Hardware
- - LiPower/1 page
  - Lithium Polymer batteries for ham radio applications
  - 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
  - ID-Omatic/1 page
  - N0XAS ID-O-Matic - VK1OD implementation
  - Thunderbolt/2 pages
  - Thunderbolt GPS Disciplined Oscillator - VK1OD implementation
  - GpsDoArtwork.pdf
  - VK3XDK-10GHz/1 page
  - Thinking aloud on the VK3XDK 10GHz transverter receiver performance
  - DM780-TS4/2 pages
  - Compatibility of HRD/DM780 with Digi Portserver TS4
  - HHD Software Serial Monitor HTML Export
  - MS6514/1 page
  - Mastech MS6514 review
  - AL80Bcooling/1 page
  - AL80B cooling
  - FM900/4 pages
  - FM900 - EPROM for 2m band in the Southern Highlands
  - FM900-SH.pdf
  - SH.TXT
  - SHC.TXT
  - KG-UV920P/1 page
  - KG-UV920P - a repair / support story