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Date: Mon, 5 Aug 2013 19:02:00 -0400
Message-ID: <CAMFjj73d8FtXnuawdedY2VajBNCXNar+D_bx4285R0X9tz3SPg@mail.gmail.com>
From: Warren Ziegler <wd2xgj@gmail.com>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Quadrocopter antenna, sri, a bit OT
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Stefan,
    But 100m is not better than your kite experiments!
Yes you gain control but not height.
You will still need a battery to land the quadcopter in the event of a
failure of the power carrying wire.


73 W


On Mon, Aug 5, 2013 at 6:53 PM, Stefan Sch=E4fer <
Stefan.Schaefer@iup.uni-heidelberg.de> wrote:

> **
> Hi all,
>
> I just gathered some informations from the web. Just one example for a,
> probably, suitable hexacopter to carry a LF transmit antenna.
>
> For example a DJI F550, see a video at
> http://www.youtube.com/watch?v=3DveDrtdE6njo or
> http://www.youtube.com/watch?v=3D2QC9so2so3Y). Looks like they can easily
> lift 1 kg! You can fly about 10 minutes with a 5.3 Ah battery. The batter=
y
> voltage is to 11.1V...14.8V. So the power consumption may be 200...300 W =
!
> With a compact SMPS on the copter and a 2 wire line it could be possible =
to
> carry the antenna. And 100m is no problem too!!
> I consider to buy one! And look this, most fascinating.
> http://www.youtube.com/watch?v=3DJecyY79K7kY
>
> 73, Stefan/DK7FC
>
>
> Am 05.08.2013 15:25, schrieb Stefan Sch=E4fer:
>
>
> Am 04.08.2013 17:52, schrieb DK1IS:
>
> [...]But with nowadays quadrocopters and a "little" reduction of the
> demands it should be possible to feed them from the ground with DC (or AC
> plus converters for reduction of current) via 2 wire line and having a go=
od
> antenna too.
>
> 73,
> Tom, DK1IS
>
>
> That's it! So, Markus, could you ask your friend abot some technical
> details? What is the supply voltage of the system and power consumption (=
or
> lifetime at a certain battery charge)? Is it possible to lift 1 kg and ho=
w
> does it change the power consumption? It should be no problem to feed DC =
to
> the system or a compact power supply in the sky and normal 230V mains at
> ground (todays PSUs have an input voltage range of 85...240V AC, so a
> certain voltage drop on the thin wire should be no problem.
> Maybe you can do some tests?
>
> The advatages are clear. A quadrocopter keeps the position and height,
> even in smaller wind blasts while a balloon bounces left and right. The
> costs of Helium will quickly overcome the costs for a quadrocopter. Ah an=
d
> such a project is simply more interesting i guess :-)
>
> 73, Stefan/DK7FC
>
>


--=20
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1

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<div dir=3D"ltr">Stefan,<div>=A0 =A0 But 100m is not better than your kite =
experiments!</div><div>Yes you gain control but not height.=A0</div><div>Yo=
u will still need a battery to land the quadcopter in the event of a failur=
e of the power carrying wire.</div>
<div><br></div><div><br></div><div>73 W</div></div><div class=3D"gmail_extr=
a"><br><br><div class=3D"gmail_quote">On Mon, Aug 5, 2013 at 6:53 PM, Stefa=
n Sch=E4fer <span dir=3D"ltr">&lt;<a href=3D"mailto:Stefan.Schaefer@iup.uni=
-heidelberg.de" target=3D"_blank">Stefan.Schaefer@iup.uni-heidelberg.de</a>=
&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><u></u>


 =20

<div bgcolor=3D"#ffffff" text=3D"#000000">
Hi all, <br>
<br>
I just gathered some informations from the web. Just one example for a,
probably, suitable hexacopter to carry a LF transmit antenna. <br>
<br>
For example a DJI F550, see a video at
<a href=3D"http://www.youtube.com/watch?v=3DveDrtdE6njo" target=3D"_blank">=
http://www.youtube.com/watch?v=3DveDrtdE6njo</a> or
<a href=3D"http://www.youtube.com/watch?v=3D2QC9so2so3Y" target=3D"_blank">=
http://www.youtube.com/watch?v=3D2QC9so2so3Y</a>). Looks like they can easi=
ly
lift 1 kg! You can fly about 10 minutes with a 5.3 Ah battery. The
battery voltage is to 11.1V...14.8V. So the power consumption may be
200...300 W ! With a compact SMPS on the copter and a 2 wire line it
could be possible to carry the antenna. And 100m is no problem too!!<br>
I consider to buy one! And look this, most fascinating.
<a href=3D"http://www.youtube.com/watch?v=3DJecyY79K7kY" target=3D"_blank">=
http://www.youtube.com/watch?v=3DJecyY79K7kY</a><br>
<br>
73, Stefan/DK7FC<br>
<br>
<br>
Am 05.08.2013 15:25, schrieb Stefan Sch=E4fer:
<blockquote type=3D"cite">
 =20
  <br>
Am 04.08.2013 17:52, schrieb DK1IS:
  <blockquote type=3D"cite">
   =20
    <div>[...]But with nowadays quadrocopters
and
a &quot;little&quot; reduction of the demands it should be possible to feed=
 them
from the ground with DC (or AC plus converters for reduction of
current) via 2 wire line and having a good antenna too.<br>
    <br>
73,<br>
Tom, DK1IS<br>
    </div>
  </blockquote>
  <br>
That&#39;s it! So, Markus, could you ask your friend abot some technical
details? What is the supply voltage of the system and power consumption
(or lifetime at a certain battery charge)? Is it possible to lift 1 kg
and how does it change the power consumption? It should be no problem
to feed DC to the system or a compact power supply in the sky and
normal 230V mains at ground (todays PSUs have an input voltage range of
85...240V AC, so a certain voltage drop on the thin wire should be no
problem.<br>
Maybe you can do some tests?<br>
  <br>
The advatages are clear. A quadrocopter keeps the position and height,
even in smaller wind blasts while a balloon bounces left and right. The
costs of Helium will quickly overcome the costs for a quadrocopter. Ah
and such a project is simply more interesting i guess :-)<br>
  <br>
73, Stefan/DK7FC<br>
</blockquote>
</div>

</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>73 Warren K2=
ORS<br>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XGJ <br>=A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 WD2XSH/23<br>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WE2XEB/2<br>=A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 WE2XGR/1<br><br>=A0
</div>

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