Antennas

Contents:
  1. Common Antenna Problems
  2. End Fed Random Wire
  3. Squid Poles
  4. Dipoles-Horizontal
  5. OCF Dipoles
  6. G5RV
  7. W3DZZ MULTI-BAND ANTENNA 80-40-20-15-10M
  8. Inverted Vees
  9. Loops
  10. Yagi–Uda Antennas
  11. Building Yaga Antennas
  12. Beverage Antenna (Receive Only)
  13. My Antenna Projects
  14. Station Master
  15. Professional Antennas
  16. Passive Intermodulation (PIM)
  17. Satinless Steel vs. Copper and Aluminium
  18. References


[Top][Home]
Related Pages:
  1. Delta Loop Antenna

Common Antenna Problems

http://www.k0bg.com/problems.html#swr

[Top][Home]

End Fed Wire Antenna

Random-Wire-Antenna-Lengths (PDF) (local)

End Fed Half Wave Antennas:

One of the most practical antennas for feild work is the half-wave end-fed antenna. It employs a 49:1 transformer to lower the impedance of a half-wave wire fed at the end. It allows multi-band operation with certain wire lengths, mainly 20 meters and 40 meters. The longer wire covers bands from 80m to 15 and even 10m.

One core will handle 100W SSB. If you want to run high duty-cycle modes, add additional cores to your transformer. https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/ balun-designs.jpg
https://www.balundesigns.com/model-49131-49-1-80-10m-efhw-up-to-1kw/



[Top][Home]


Squid Poles

Introducing the squid pole - Phil Storr's home page

VK7JJ Squid Pole Writeup

Haveford HAM Amateur Radio Telescopic Squid Pole - 10 Metres
Image Image
Image Image

https://www.ebay.com.au/itm/201669031879
http://www.perite.com/vk7jj/squidpoles.html

ebay RADIAL-VARIABLE-CERAMIC-TRIMMER-CAPACITORS
eBay item number:281902864023
http://www.philipstorr.id.au/radio/technical/Squid%20pole.pdf

[Top][Home]

Dipoles-Horizontal

https://offgridham.com/2016/12/portable-antenna-hf/

[Top][Home]

OCF Dipoles

OCF Dipoles
OCF Dipole by Ron Bertrand

[Top][Home]

G5RV

https://en.wikipedia.org/wiki/G5RV_antenna

G5RV multi-band antenna - Louis Varney, Silent Key, alias G5RV,
The legacy of Louis Varney (I), by Louis Varney, G5RV
http://www.astrosurf.com/luxorion/qsl-g5rv.htm


G5RV-Jr-MFJ-1778M.pdf [PDF]

The G5RV Multiband HF Antenna:
https://www.qsl.net/yb0emj/tech.html

[Top][Home]

W3DZZ MULTI-BAND ANTENNA 80-40-20-15-10M

https://rsars.files.wordpress.com/2013/01/w3dzz-antenna-iss-1-31.pdf

Antenna Traps for the W3DZZ 7.1 MHz 100 Watts

W3DZZ - a classic dipole heavily modified, now 5 bands & no tuner



[Top][Home]

Inverted Vees

VK4WST Muti Inverted-V Antenna: Image

[Top][Home]

Loops

VK2JI 40 meter Loop: https://vk2ji.com/equipment/antennas/40-metre-horizontal-loop-antenna/

[Top][Home]

Yagi–Uda Antennas

A Yagi–Uda antenna, commonly known as a Yagi antenna, is a directional antenna consisting of multiple parallel elements in a line, usually half-wave dipoles made of metal rods. Yagi–Uda antennas consist of a single driven element connected to the transmitter or receiver with a transmission line, and additional "parasitic elements" which are not connected to the transmitter or receiver: a so-called reflector and one or more directors. It was invented in 1926 by Shintaro Uda of Tohoku Imperial University, Japan, and (with a lesser role played by his colleague) Hidetsugu Yagi.
Source:https://en.wikipedia.org/wiki/Yagi-Uda_antenna

Hidetsugu Yagi holding his famous Yagi-Uda design of radio antenna, which he co-developed with Shintaro Uda in the 1920s at Tohoku Imperial University in Japan.
Hidetsugu Yagi holding his famous Yagi-Uda antenna
Soure:https://physicsworld.com/a/iconic-japanese-antenna-shrunk-to-the-nano-scale/

[Top][Home]


Building Yaga Antennas

Yagi Calculator by John Drew - DL6WU style yagis for VHF/UHF (updated 14 July 2015): http://www.vk5dj.com/yagi.html

For general design I use the VK5DJ program. It is based on the research conducted by DL6WU.

A Note from the VK5DJ web Site:

This is buried in the Acknowledgements section and can easily be missed.

Yagi Calculator is a program to assist with the design of long yagi antennas. It uses the graphs and principles developed by DL6WU and printed originally in the German Radio Magazine VHF Communications (March 1982). The article was titled Extremely Long Yagi Antennas. For best front to back ratio it is recommended that a yagi be constructed with one of the following numbers of elements - 10,14,19,24. Yagi builders are reminded that DL6WU designs are primarily for long yagis. A boom length of 2 wavelengths (or 10 elements) would be a minimum sized antenna. On the other hand, yagis with as few as 8 elements have used the design and worked very well.

Download the windows program, SetupYagiCalculator.exe from John Drew's site. It runs under wine without any issues on my Ubuntu Version 18.04.

Download SetupYagiCalculator.exe

An excellent resource for building Yagi Antennas is The Welshman, G0KSC. His website can be found here: Free Yagi Antenna Designs for Ham Radio:

https://www.g0ksc.co.uk/

Folded Dipoles for VHF/UHF Yagis:
http://www.ifwtech.co.uk/g3sek/diy-yagi/dipoles.htm

[Top][Home]


Beverage Antenna (Receive Only)

https://en.wikipedia.org/wiki/Beverage_antenna

[Top][Home]

My Antenna Projects

Yagi No1 - 2m 13el Antennas Built February 2018:
As yet still not completed.

Yagi No2 - 70cm 8el Antennas Built March 2019:
70cm 8el Antennas Built March 2019

[Top][Home]

Station Master

This is about 5.5 meters in length. 18ft Its Frequency Range is 26-29mhz and it can be Tuned to most Amateur Bands with a good Tuner. The MK1 is Currently Pre Tuned for 27mhz, Via an Antenna ANALYZER. Its Power Rating is 1 KiloWatt, it can also be Adjusted in length. The MK1 is the Best Performing 1/2 wave vertical ever made, with its Heavy Duty 1KW Pre Tuned External Coil. The Coil has been mounted in Original Design, that can be Easily removed and Serviced or replacement with other Amateur Loading Coils. Example: 80m/40m/20m/ Etc. The MK1 can also be shortened for 10m and 6m. Truly a Diversified and Modifiable Base Station Vertical, that can also be tuned to the Marine Band 28.880mhz AM.

The antenna is adjustable from the top of the antenna for fine tuning as well as the coil which is made of 2 mm copper. End fed SO-239 Connection.

[Top][Home]


Professional Antennas

Commercial Antennas

[Top][Home]

Passive Intermodulation (PIM)

PIM is a form of intermodulation distortion that occurs in components normally thought of as linear, such as cables, connectors and antennas. PIM shows up as a set of unwanted signals created by the mixing of two or more strong RF signals in a nonlinear device, such as a loose or corroded connector, or nearby rust. Other names for PIM include the diode effect and the rusty bolt effect.
Source:https://www.anritsu.com/en-US/test-measurement/technologies/pim

[Top][Home]


Satinless Steel vs. Copper and Aluminium

Antenna Wire Stainless Steel, Aluminium, or Copper:
https://www.hfkits.com/antenna-wire/

Round Wire ac Resistance Calculator:
http://chemandy.com/calculators/round-wire-ac-resistance-calculator.htm

Stainless Steel vs. Copper Dipole Comparison @ 7 MHz [PDF]:
http://www.mwrs.org.au/Documents/StainlessSteelvsCopperDipoleComparison.pdf

Antenna Wire: Stainless Steel vs. Copper:>Satinless Steel vs. Copper
https://www.mwrs.org.au/2011/06/23/antenna-wire-stainless-steel-vs-copper/

[Top][Home]

References

Martin Steyer DK7ZB Antenna-Homepage:
https://www.qsl.net/dk7zb/dk7zb_news.htm

Antenna Schemes:
http://www.in3eci.it/index.php?fl=5&op=mcs&id_cont=383&eng=1%20TO%2080&idm=427

[Top][Home]
Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20190128 - pre published v0.9