Re: [HCDX]: Re: Beverages

[Alf Aardal <alfardal@xxxxxxxxx>]

Hello Aart.

I think many dxers....and spesially those that dx on the mediumwave,consider 1
wavelength as a beverage antenna...even if if its calculated for the middle of the
MW...300000/100=300 meter.But to cover the entire MW,starting from the lower MW ex.
500 khz...such a antenna would be 600 meter....and there are of course some that
have that space to erect such a antenna....but very few have that space at their
homeplace!

But such a antenna is also 2 wavelengths for 1000 khz....and 3 wavelengths for 1500
khz....which would be a real "signal snatcher".....
If you the chance to put up a 100 meter or even a 200 meter antenna..do it...!

If also the area is slooping downhills against the continent you want to listen
to...the better.
And of course,the antenna should point in the direction you decide to listen to.

If  the terrain goes upwards (just like the area I have...unfortunately enough) this
is the poorest alternative to erect antennas...even this way you can hear
signals...but the hills will block the horizon...if you have steep hills.
The second alternative is erecting from the top of the hill downwards...and finally
the third alternative,
which is the best...just a little below the hilltop and downwards..but not to steep.

The more antenna wire you lay out f.ex. 3-4-500 meter,the more directivity the
antenna gets.
If you're planning to go on a mobile dx-pedition using these antennas...try to find
a place where there is NO manmade noise...power lines...street
lights..factorys..etc...

You can of course experiment with the easy way...just laying out the wire and
connect it directly to the receiver.
The other method......which demands more time and of course work....is connecting a
resistor (range 390-560 ohm would do fine) between the far end of the antenna and
ground...which could consist of 5 copper rods into the ground.
In this way the antenna would have more directivity effects....and if you decided to
go even further on developing your antenna...you can connect the antenna (end
nearest to receiver)to a balun..also here you can have you own ground system...the
feed in,could be of coaxial cable (RG58 C/U),
connected to the receiver.
Also you can try experimenting laying on the ground...or hanging it up on poles or
trees...but do get a sufficent height...there could be people walking
around......and you would get your story too...if it isn't high enough!!!

Well.......it all depends on experimenting....with different lengths.....and so
on..........I would say it the following way:
If you can get up a antenna in the length of  2-300 meters ...you'll get better
results on MW!!

Should you need more help...I sure would like to help you out..as good as I can.

73's

Alf Aardal



"A.C. Rouw" wrote:

> Fellow DX-ers,
> I have been reading with some interest the stories about Beverage antennas.
> Compared to elk, snakes, etc, life is rather dull here, with nothing bigger than
> a sparrow resting on my antenna, or a mouse or an occasional rat wandering
> through my garden (at the border of a small SW German city, no chance to get up
> anything close to a true long wire)
> My question is maybe a bit stupid, but from what length on does a "normal" long
> wire become a directional Beverage ? 0.5, 1.0 or 2.0 wavelength, or even more ?
> I have no experience whatsoever with such long wires (15 m is all I can get at
> my neigborhood), and I was planning some mobile AM-DX (daytime to start with)
> from my car up in the Black Forest mountains, just in my backyard so to speak.
> (sorry, no elk or dangerous snakes there either, so do not expect good stories).
> I have now prepared some 100m of wire to use, but this is still much less than
> 1.0 wavelength for mediumwave. I have no clue if this already gives some
> directionality. In principle I can extend the wire at will. I have located a
> parking place where I would be able to lay a few 100m out (direction west). But
> thinking of re-winding it again, I do not want to overdo things.
> Any experience ?
>
> Regards,
> Aart Rouw
> Bühl, SW Germany
> AR7030 + 15m longwire.
> ------------------------------------------------------------------------
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