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M0BZI England flag England

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HI, Ime Fred, From, Sandbach, In Cheshire England, m0bzi@hotmail.co.uk

The picture is of my shack, My main Transceiver is the,

YAESU FT-1000MP,

My antenna is the "WESTERN HF 10" this is a, 160--6m wire dipole, thats just 67ft [20.6m] long, I have it up at its optimal high for my qth of just 25ft at the centre and 20ft high at the ends, this slope is just enough for a bit of dxing,

With this antenna ive been able to work stations:all over Europe-the USA-VK-ZL-VE-IOTA-

MANY HAVE ASKED HOW DOES THIS ANTENNA WORK?

SO HERE IS THE HISTORY OF MY ANTENNA,

I KNOW ITS LONG BUT PLEASE READ IT ALL BECAUSE IVE TRIED TO EXPLAIN HOW I MADE IT,AND HOW IT WORKS,

After moving in 2006 from a house with a long garden in south Wales to a retirement bungalow in Brereton Green,Sandbach, Cheshire, I wanted a multi band wire dipole that would fit into my small garden, So I set about making one, using a antenna analyzer, an atu, and a lot of wire, and bits and bobs from the shack, this is a, [12' x 8'] wooden shed,

My starting point was to make a 20m wire dipole and feed it with 17ft of 300 ohm twin feeder, I then wound two 80m induction coils to go on the ends, Then i added wire to each end until, it tuned up on the 80m band, this first attemped was 65ft long and using a external ATU it tuned up on the 80m 20m 15m and 10m bands,

Next was to make a special 4-1 balun to go at the bottom of the feeder, I bifilar wound two pcs of 16swg insulated copper wire onto a thick ferrite rod, I wound it as an impedance step transformer, And by crossing over two of the wires it gave it the Marconi effect, By using an external atu i could now tune the 160m band,

Next I changed the antenna wire from drawn copper wire to the mill spec nylon coated poly weave wire, At this point i started to put a loop at the end of the wires to take the strain off the screws,These loops 8 in all also help in band tuning, [ How this works is that when you bend antenna wire back on its self as in a loop and pull it tight you cause a resistance you can then set the freq of a band, So by putting a loop at both ends of each wire then adjusting the length of the wires and then changing the feeder to 450 ohm and reduced its length to just 15ft 3" i was able to set the freq and get a match on all bands ] Then i made big changes to the length and dia of the induction coils and wound them with copper magnet winding wire,

I finaly got an antenna that has a very low noise level and is resonant on 80m around 3.720 mhz, And it will also tune up on all 10 hf bands 160--6m, with a low swr,

[this antenna isnt just plug n play]

You do need to have knowledge of transmitters and antenna's to understand how this antenna works,The twin feeder is part of the antenna so the feeder and both wire elements need to be in clear space or it wont tune as it should you also need to find the optimal hight,

The inturnal atu that in my Yaesu ft-1000mp will tune all bands 80-10 with an swr of between 1.1-2.0, you will also need to find the optimal hight, At 25ft high my antenna tunes very well, But at 35ft it wont tune very well [high swr]

Not all internal atu's are the same some will tune all bands 160-6m while others will only tune the harmonic bands ie 80.40.20.15.10m you will need to use an external atu for the other bands,

Ive left 4" of wire at the ends of the insulators to add wire to for tuning the cw part of the 160m band,But doing this could upset the tuning on other bands,

this new antenna is now 67ft [20.6m] long, In my garden it will work as low as 25ft, and its been tested to 1000w to make sure that its ok at 400w our legal limit in the UK, Ive named it the "WESTERN HF 10" And it realy does tune all 10 hf bands 160m to 6m the noise level is very low,and the SWR is also low see Steves review,

[At this point i would like to thank all those that have shown an interest in the deveopment of this antenna and for there tips and addvice it took a long time but its been worth it ]

You can see a picture and read the review that Steve Nichols g0kya gave this antenna at http://g0kya.blogspot.com/2010_08_01_archive.html [Steve writes in RadCom]

there are also reviews at http://www.eham.net/reviews/detail/9424

There is also a news item about this antenna in the Dec 2010 copy of RadCom page 14,

+++ I now make them from,

+++Plastic coated poly weave 7x7=49 strands antenna wire, that wont stretch or kink,

+++450ohm twin feeder,15ft 3ins long, this is part of the antenna so it must be kepted away from other objects,

+++plus two special wire wound inductors I wind these using copper magnet winding wire,they give the antenna its full electical length,and are heatshrunk,

+++Plus a special 4-1 balun that I wind from 2 pcs of 16g solid insulated copper wire bifilar wound onto a thick ferrite rod,its wound as a impedance step transformer ,this gives the dipole the marconi effect ,[ it is these windings plus the two special inductors, and the 8 built in loops ] that make it possable to tune all 10hf bands,and also helps to stop any stray RF-TVI- and AUDIO problems resonating from the coax, this balun is fitted at the bottom of the twin feeder just connect your low loss coax,

+++All termanal screws,nuts,washers are stainless steel,[the two screw eys on the balun are plated steel] all connections are crimped,then soldered, then covered in heatshrink, there is no strain on any of the connections because I use a loop system,the coax socket is the SO239,

+++the whole dipole is just 67ft long and it works very well, with good reports from VK-ZL-VE-IOTA- the USA,and all over EUROPE,

+++You may need to use an external atu to tune some bands read Steves review,

+++And like all wire dipoles its best to use a centre surport, I use 25ft of 2" ali pole with a 1" piece of ali pole 18"long fitted to the top like an inverted L with a screw eye to hang up the antenna,Then pull the feeder away from the pole,

+++The transceiver and any atu used must be well grounded, [a good earth is required]

+++ You can buy on Ebay under "Western hf 10" for £75.00  or its cheeper to buy direct for £68.at m0bzi@hotmail.co.uk,pay by PayPal,Cheque,Po,    or call, 07748331458. to arange pickup,

Shipping cost,

For the U/k  the p/p is £10.00,using next day special delivery, for europe the p/p is £15.00 by Airsure, The rest of the world £22.00.by Airsure,

Ive also gone green,by using a 250w wind turbine,also 500w of solar panels my battrey bank is 12v 1700ah the wire is 70mm2, into a 5000w pure sign wave power inverter wired into my distribution box through a 45a roto switch, Ime making a saving of £40.00 a month on my bills,

regards,

Fred m0bzi,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45534 Last modified: 2013-07-16 03:48:14, 7963 bytes

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