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 Dipole
• 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
  

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
  

• 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
  

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

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© Copyright: Owen Duffy 1995, 2012. All rights reserved. Disclaimer.