OwenDuffy.net
VK1OD Theme page: Antennas
Concepts
Dipoles
Phased arrays
Yagi arrays
Marconi
Loops
Antenna Tuning Units
Matching
Masts / support structures / grounding
Other
dB, dBi, and dBd
Concepts
The importance (or not) of being resonant
Amateur Radio Magazine reinforces antenna resonance myth
Is any antenna better than no antenna at all?
Loss in antenna conductor materials
A simple explanation of the so called current forcing property of a quarter wave transmission line
Counterpoise - what does it mean?
Half Folded Half Wave Dipole
Folded Half Wave Dipol
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Antenna Effective Aperture
Dipole loaded vertical coax feed line
Learning models or a poor workman always blames his tools
Effective Radiated Power (ERP)
Comment on W8JI's 2006 coil measurement experiment
Setting up shunt matching with an MFJ259B or the like
A simple explanation of the voltage forcing property of a half wave transmission line
Designing a Gamma match using a Smith chart
Small single turn un-tuned shielded loop
Dipoles
14MHz Inverted Vee Dipole
An antenna for 7MHz local contacts
Field strength measurement - Buddipole and FSM
Feeding a G5RV
Optimising a typical G5RV
N4UJW / PY2RML Ham Universe short dipole
7 MHz Dipole at VK1ZKD
Optimising a coax fed half wave dipole
Minimum length of a non-resonant multi-band dipole
In pursuit of dipole resonance with an MFJ259B
Bowral 7MHz dipole for local contacts
Is the 133' centre fed multiband dipole a no-brainer
Bowral G5RV for local contacts
G5RV according to G5RV
Coax traps
Bootstrap coax traps for antennas
A trapped dipole for 80m and 40m using bootstrap coax traps
Bootstrap coax traps for antennas - DG1MFT measurements
Comment on QEX article - "Coaxial Traps for Multiband Antennas, the True Equivalent Circuit"
Linear loading
NEC model of the Cobra antenna
Other loading / compensation
Double Bazooka Antenna performance
De-mystifying the W5GI Mystery Antenna
G4CQM 50Ω coaxial dipole
Comment on W5DXP's 2011 coil measurement experiment
Phased arrays
An exploration of a cophased collinear array with coax phasing stubs
Four over Four for 144MHz
Exploration of a design for an 80m vertical antenna - Part I
Diamond X-50A
NEC Model of WA6SVT Omni-Gain Vertical Collinear for VHF and UHF
Silicon Chip Collinear
Yagi arrays
DL6WU Long boom Yagi design tool
NEC models of DL6WU Yagis
Estimating Beamwidth of DL6WU long boom Yagis for the purpose of calculating an optimum stacking distance
Novel Gamma Match Construction
Refurbishing a Hy-gain 2meter 14 element beam (214, VB-214)
Marconi
Inverted L for HF
Antenna Factor of short tuned vertical with concentrated loading
Estimating Antenna Factor for a MobileOne M40 helical whip
An unloaded vertical as a multi-band HF antenna
The VK5BUG Black Stick under the microscope
The Force12 FP-40C under the microscope
Narooma End Fed Wire
Antenna Tuner Calibration Chart
Hustler 4BTV Report
Electrically short unloaded whips on vehicles
StationMaster on 40m
Matching a 5/8λ vertical
Adjusting a loaded HF vertical
Matching a 5/8λ vertical - example 1
Loops
Small square un-tuned loop for field strength measurement
Small square un-tuned loop for field strength measurement - NEC models
Antenna Tuning Units
Estimating T match ATU efficiency
Adjusting a T match ATU for best efficiency
ATU efficiency – an example
Palstar AT2K
Ameritron ATR-30
Matching
The Beta or Hairpin Match
Masts / support structures / grounding
Antenna mast for experimental use
Earthing system at VK1OD
Driving earth rods
Shielded station earth conductor
Other
Diamond D130 Discone
An explanation of the Comet CHA250
Corrosion protection of antenna connections
Exploitation of NEC's GM card
PC high voltage RF capacitors
An A/B comparison on 40m over a 14,700km path using QRSS
An A/B comparison on 40m over a 17,000km path using QRSS
A comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
A comparison of a 40m quarter wave verticals with elevated radials and horizontal dipole over a 14,700km path using QRSS
Distribution of S/N ratio under fading on HF
Another comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
Yet another comparison of two 40m quarter wave verticals with elevated radials over a 14,700km path using QRSS
VK1KW QRSS beacon on 2m 15/01/13
Capturing QRSS3 with Spectrum Lab
A comparison of a G5RV at VK1OD and QW vertical at VK2DVK on 40m over a 14,700km path using QRSS
How DOES the PA0RDT MiniWhip work
InnovAntennas LFA explanation
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