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Date: Tue, 06 Aug 2013 01:11:49 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Quadrocopter antenna, sri, a bit OT
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Hi Warren, LF/VLF,

I just found this: http://www.youtube.com/watch?v=3DG3yR-GxD1is  Take a=20
look at it. I can't find the words. I think i must have one :-)
That must be _SEVERAL_ 100m above ground. I think we could even do VLF=20
experiments with such a copter. Maybe a 500m vertical? I remember the=20
weight of the wire in my 300m kite antenna test was about 1.5 kg, not=20
more. So with 500m we could come lower than 5.17 kHz, like i did in=20
2010/2011.

73, Stefan/DK7FC


Am 06.08.2013 01:02, schrieb Warren Ziegler:
> 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=20
> failure of the power carrying wire.
>
>
> 73 W
>
>
> On Mon, Aug 5, 2013 at 6:53 PM, Stefan Sch=E4fer=20
> <Stefan.Schaefer@iup.uni-heidelberg.de=20
> <mailto: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 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!!
>     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 good 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 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.
>>     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 and 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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Hi Warren, LF/VLF,<br>
<br>
I just found this: <a class="moz-txt-link-freetext" href="http://www.youtube.com/watch?v=G3yR-GxD1is">http://www.youtube.com/watch?v=G3yR-GxD1is</a>&nbsp; Take a
look at it. I can't find the words. I think i must have one :-)<br>
That must be <u>SEVERAL</u> 100m above ground. I think we could even
do VLF experiments with such a copter. Maybe a 500m vertical? I
remember the weight of the wire in my 300m kite antenna test was about
1.5 kg, not more. So with 500m we could come lower than 5.17 kHz, like
i did in 2010/2011.<br>
<br>
73, Stefan/DK7FC<br>
<br>
<br>
Am 06.08.2013 01:02, schrieb Warren Ziegler:
<blockquote
 cite="mid:CAMFjj73d8FtXnuawdedY2VajBNCXNar+D_bx4285R0X9tz3SPg@mail.gmail.com"
 type="cite">
  <div dir="ltr">Stefan,
  <div>&nbsp; &nbsp; But 100m is not better than your kite experiments!</div>
  <div>Yes you gain control but not height.&nbsp;</div>
  <div>You will still need a battery to land the quadcopter in the
event of a failure of the power carrying wire.</div>
  <div><br>
  </div>
  <div><br>
  </div>
  <div>73 W</div>
  </div>
  <div class="gmail_extra"><br>
  <br>
  <div class="gmail_quote">On Mon, Aug 5, 2013 at 6:53 PM, Stefan
Sch&auml;fer <span dir="ltr">&lt;<a moz-do-not-send="true"
 href="mailto:Stefan.Schaefer@iup.uni-heidelberg.de" target="_blank">Stefan.Schaefer@iup.uni-heidelberg.de</a>&gt;</span>
wrote:<br>
  <blockquote class="gmail_quote"
 style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
    <div bgcolor="#ffffff" text="#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 moz-do-not-send="true"
 href="http://www.youtube.com/watch?v=veDrtdE6njo" target="_blank">http://www.youtube.com/watch?v=veDrtdE6njo</a>
or
    <a moz-do-not-send="true"
 href="http://www.youtube.com/watch?v=2QC9so2so3Y" target="_blank">http://www.youtube.com/watch?v=2QC9so2so3Y</a>).
Looks like they can easily
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 moz-do-not-send="true"
 href="http://www.youtube.com/watch?v=JecyY79K7kY" target="_blank">http://www.youtube.com/watch?v=JecyY79K7kY</a><br>
    <br>
73, Stefan/DK7FC<br>
    <br>
    <br>
Am 05.08.2013 15:25, schrieb Stefan Sch&auml;fer:
    <blockquote type="cite"> <br>
Am 04.08.2013 17:52, schrieb DK1IS:
      <blockquote type="cite">
        <div>[...]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 good antenna too.<br>
        <br>
73,<br>
Tom, DK1IS<br>
        </div>
      </blockquote>
      <br>
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 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="all">
  <div><br>
  </div>
-- <br>
73 Warren K2ORS<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WD2XGJ <br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WD2XSH/23<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WE2XEB/2<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WE2XGR/1<br>
  <br>
&nbsp;
  </div>
</blockquote>
</body>
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