The attached table of dimensions was calculated using antenna modelling software by Bill Marsh. The purpose of this exercise was to better understand the EWE antenna characteristics by using different combinations of vertical and horizontal dimensions. Dimensions are based on an “On Ground” EWE with ground wire between vertical elements.
Posted in Antennas
Some More Observations regarding the EWE Antenna – by Bill Marsh
I have recently been doing some design work on the EWE antenna to better understand its characteristics. I have been using “Modelling Software – EZNEC”, the source courtesy of Peter Mott.
REMOTELY TUNED 5 inch FSL ANTENNA
of “Gary DeBock” Design
Posted in Antennas
An article by Bill Marsh
Where to Point your Antenna Part2
Most seasoned DXers will be familiar with what is written below and I look forward to comments and any corrections. The article is primarily aimed at past members coming back to the hobby and to new members joining our fraternity.
Posted in Antennas
Thanks to Andy Gardiner for this image.
HOW TO CONNECT YOUR “WORLD BAND RADIO” TO A “EWE” ANTENNA etc THROUGH INDUCTIVE COUPLING FOR MEDIUM WAVE DX:
Written by Bill Marsh (Jnr)
This article is the result of my helping Tony King interface his Tecsun PL-380 to a EWE antenna. Tony had been using an external ferrite rod antenna to inductively couple to his 380 for some time and latterly with single layer former wound coils.
As I was intending to replace my aging Sangean ATS-909 with a Tecsun PL-880 I thought his idea would be a great avenue to explore. I did not want to break the seal on my new Tecsun to carry out internal modifications.
Posted in Antennas
There are commercially available antennas still for sale in New Zealand. Matchmaster have a 3-element and 5-element single dipole design.
However to cover 20MHz of bandwidth for FM (88-108MHz) a single dipole design liek the Matchmaster will really struggle, with performance falling off the further from its design frequency you tune. So a combo yagi which is a hybrid log periodic yagi and standard yagi, sometimes called a “logyag” is a good way to go. It has 3 dipole elements, one cut for the lower portion, one for the middle and one for the top of the FM band giving much more even performance. There are also optimised yagi designs available on K6STI’s excellent site.
Bill Marsh Jnr has completed an article on building a portable EWE antenna, view the article here.
Posted in Antennas
Bill Marsh has been experimenting with the ferrite sleeved loop design and has come up with a clever design. You can read the full article here.
Bill Marsh has been experimenting further with his coax loop for MW and the X-band. Here are the results:
X-BAND LOOP NUMBER 2
Bill Marsh Jnr. has recently completed his X-band coaxial loop antenna (tunes 550-1700kHz). The full article appears here.
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Posted in Antennas, Medium Wave, Technical
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Posted in Antennas, History, Military, Technical, Time-sensitive
HIGH EFFICIENCY AERIAL FOR SHORT WAVES
HERE is a short wave antenna that has helped me very much in my SWL work. I believe it is an original idea, for I have never seen or heard of one like it. It occurred to me when I was trying to figure out a way to have good directional antenna (all directions) without having to have a separate antenna for each direction. It has worked wonderfully well for the past six months, so I thought that others interested in the same field might like to try it.
RCI Sackville (Tantramarsh)
Thanks to Paul Rawdon reporting in DX Dialog “This could be well worth seeing.An experimental documentary film about the RCI shortwave radio towers. Images captured on 35mm film, and stories told in English, French, and Mi’kmaq.
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Posted in Antennas, Broadcasters, Shortwave
WAVE TRAPS
FOR INCREASING R.F. GAIN
By
R. J. A. LITTLE, A.M.I.R.E. South Melbourne
From – The Australasian Radio Times – July 1947
A WAVE TRAP can be defined as a circuit containing at least one condenser and one coil wired in series or parallel to form a tuned circuit. A most common form of wave trap is one utilising a parallel tuned circuit.
Aerial and Earth Systems
By “Starlite”
From the 1948/49 “Lamphouse” Annual
The early pioneers of radio were once faced by a very serious problem. Their crude attempts at transmission were being held up as the range achieved was extremely limited. Someone got the bright idea of suspending a piece of wire in the air. Thus the aerial was born. The earth was the logical conclusion. Radio transmission and reception experiments increased in efficiency.
The same holds good today.
Remember the good old ferrite loopstick antenna? Well, the FSL (ferrite sleeve loop) is a loopstick on steroids. Gary DeBock is one of many hobbyists who have been experimenting with these imposing antennas, sort of the boat anchor of aerials! His interesting article appears on Colin Newall’s dxer.ca site.
Whether you’re a ham, MW or SW DXer, there are times when a receive antenna will be very handy. I’ve experimented with EWEs, K9AYs and coax loops. Just recently, Shared Apex Loop Arrays have received a lot of publicity and this excellent Youtube presentation certainly caught my interest.
Here is a good PDF article from the designer, Mark Baumann.
And now Array Solutions are selling them.
Very compact and as for performance, we’ll let the Youtube video provide the answer.
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Posted in Antennas, Medium Wave, Technical
John Bryant at Grayland DXpedition (credit: dxing.info)
John Bryant (sadly no longer with us) penned many useful and practical technical articles for DXers looking to eke the extra out of their radios and antennas.
Here is an article showing how to add an external MW antenna to your Tecsun/Degen radio.
Luckily for us, John’s articles live on thanks to the internet.
John’s obituary on dxer.ca web site.
…don’t get these guys to do it!
You must be a member of the New Zealand Radio DX League to access this SDR.
