From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: MF powerful Beacon in Poland?
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Date: Sat, 30 Jan 2016 19:21:31 +0000
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Subject: Re: LF: MF powerful Beacon in Poland?
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Hi Richard

I'm probably the only one in MF transmitting with an antenna installed in a=
 80m high building (26 floors)
By Benidorm standars this is also a small tower. But I'm lucky to have acce=
ss to top terrace to grow my
antenna farm ;-)

I agree with the rest. Any beacon signal is wellcome and useful. CW, QRSS o=
r digital all counts
and helps to increase activity and rise the interest of other hams

>I live in a 15 floor building, on top of which there is a 30 meter mast, a=
nd my building - by Warsaw >standards - is "small". (I set a QRP world reco=
rd in 2005 from such a building on 3.5mhz)

Do you have access to this 30m mast ? Would it be possible to hang a vertic=
al slope wire from top
of the mast to top terrace on floor 15th ?

>Thus to hang a dipole on such a building would not be expensive and to mou=
nt a 1w TX at the dipole >center point would make beacon construction simpl=
e.

A dipole is not an option on MF. If the power limitation is 1w radiated pow=
er, you will have to use
many watts on Tx to get 1w radiated, specially with a low efficient antenna

What I'm using here with great success is a 11m vertical with two 6m "arms"=
 as top load
Then in the base of the antenna a coil about 3mH to get it in resonance. Th=
e ground line of PA
runs to ground using a water pipe inside the building. This is not "ground"=
 but the extension of
the vertical antenna. So the antena is really a vertical formed by  80m + f=
eed + coil + 11m + topload

If you build something similar at your building tower it should provide sim=
ilar results

My QRP tests ended by injecting 1mW to the antenna and then I got my signal=
 decoded using
Opera32 at 300Km by EB3FRN. All this on 630m band

Your mileage may vary ....as US guys say ;-)

73 de Luis
EA5DOM


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<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;">Hi Richard
<div><br>
</div>
<div>I'm probably the only one in MF transmitting with an antenna installed=
 in a 80m high building (26 floors)</div>
<div>By Benidorm standars this is also a small tower. But I'm lucky to have=
 access to top terrace to grow my</div>
<div>antenna farm ;-)</div>
<div><br>
</div>
<div>I agree with the rest. Any beacon signal is wellcome and useful. CW, Q=
RSS or digital all counts</div>
<div>and helps to increase activity and rise the interest of other hams</di=
v>
<div><br>
</div>
<div>
<div style=3D"font-family: Times New Roman; color: #000000; font-size: 16px=
">
<div>
<div dir=3D"ltr">
<div>
<div>
<div>&gt;I live in a 15 floor building, on top of which there is a 30 meter=
 mast, and my building - by Warsaw &gt;standards - is &quot;small&quot;. (I=
 set a QRP world record in 2005 from such a building on 3.5mhz)</div>
<div><br>
</div>
<div>Do you have access to this 30m mast ? Would it be possible to hang a v=
ertical slope wire from top</div>
<div>of the mast to top terrace on floor 15th ?</div>
<div><br>
</div>
&gt;Thus to hang a dipole on such a building would not be expensive and to =
mount a 1w TX at the dipole &gt;center point would make beacon construction=
 simple.<br>
<br>
</div>
<div>A dipole is not an option on MF. If the power limitation is 1w radiate=
d power, you will have to use</div>
<div>many watts on Tx to get 1w radiated, specially with a low efficient an=
tenna</div>
<div><br>
</div>
</div>
<div>What I'm using here with great success is a 11m vertical with two 6m &=
quot;arms&quot; as top load</div>
<div>Then in the base of the antenna a coil about 3mH to get it in resonanc=
e. The ground line of PA</div>
<div>runs to ground using a water pipe inside the building. This is not &qu=
ot;ground&quot; but the extension of</div>
<div>the vertical antenna. So the antena is really a vertical formed by &nb=
sp;80m &#43; feed &#43; coil &#43; 11m &#43; topload</div>
<div><br>
</div>
<div>If you build something similar at your building tower it should provid=
e similar results</div>
<div><br>
</div>
<div>My QRP tests ended by injecting 1mW to the antenna and then I got my s=
ignal decoded using</div>
<div>Opera32 at 300Km by EB3FRN. All this on 630m band</div>
<div><br>
</div>
<div>Your mileage may vary ....as US guys say ;-)</div>
<div><br>
</div>
<div>73 de Luis</div>
<div>EA5DOM</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>

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