Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25;
Message-ID: <52002D06.9050601@iup.uni-heidelberg.de>
Date: Tue, 06 Aug 2013 00:53:58 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <D54C9AE010454AA889FB7F868C97E090@AGB> <CAMFjj73CS63KePViuaqAaBxr3YkepGDoo2buhHd0rk9J1F3iCw@mail.gmail.com> <51FDA127.80500@iup.uni-heidelberg.de> <C38FD657ADC447C9A047E06D88A9A3AA@White> <51FE3D6F.5040001@iup.uni-heidelberg.de> <CAMFjj72u6XmM=tW1moV87vwYGDvQv0jpbAtKm1pHimx1FZxbFg@mail.gmail.com> <51FE78BA.9040603@kabelmail.de> <51FFA7AF.6050407@iup.uni-heidelberg.de>
In-Reply-To: <51FFA7AF.6050407@iup.uni-heidelberg.de>
Subject: Re: LF: Quadrocopter antenna, sri, a bit OT
Content-Type: multipart/alternative;
 boundary="------------050106020506040500020408"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

This is a multi-part message in MIME format.
--------------050106020506040500020408
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id r75Ms4VS021185

Hi all,

I just gathered some informations from the web. Just one example for a,=20
probably, suitable hexacopter to carry a LF transmit antenna.

For example a DJI F550, see a video at=20
http://www.youtube.com/watch?v=3DveDrtdE6njo or=20
http://www.youtube.com/watch?v=3D2QC9so2so3Y). Looks like they can easily=
=20
lift 1 kg! You can fly about 10 minutes with a 5.3 Ah battery. The=20
battery voltage is to 11.1V...14.8V. So the power consumption may be=20
200...300 W ! With a compact SMPS on the copter and a 2 wire line it=20
could be possible to carry the antenna. And 100m is no problem too!!
I consider to buy one! And look this, most fascinating.=20
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=20
>> demands it should be possible to feed them from the ground with DC=20
>> (or AC plus converters for reduction of current) via 2 wire line and=20
>> having a good antenna too.
>>
>> 73,
>> Tom, DK1IS
>
> That's it! So, Markus, could you ask your friend abot some technical=20
> details? What is the supply voltage of the system and power=20
> consumption (or lifetime at a certain battery charge)? Is it possible=20
> to lift 1 kg and how does it change the power consumption? It should=20
> be no problem to feed DC to the system or a compact power supply in=20
> the sky and normal 230V mains at ground (todays PSUs have an input=20
> voltage range of 85...240V AC, so a certain voltage drop on the thin=20
> wire should be no problem.
> Maybe you can do some tests?
>
> The advatages are clear. A quadrocopter keeps the position and height,=20
> even in smaller wind blasts while a balloon bounces left and right.=20
> The costs of Helium will quickly overcome the costs for a=20
> quadrocopter. Ah and such a project is simply more interesting i guess =
:-)
>
> 73, Stefan/DK7FC

--------------050106020506040500020408
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html; charset=ISO-8859-1"
 http-equiv="Content-Type">
</head>
<body 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 class="moz-txt-link-freetext" href="http://www.youtube.com/watch?v=veDrtdE6njo">http://www.youtube.com/watch?v=veDrtdE6njo</a> or
<a class="moz-txt-link-freetext" href="http://www.youtube.com/watch?v=2QC9so2so3Y">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 class="moz-txt-link-freetext" href="http://www.youtube.com/watch?v=JecyY79K7kY">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 cite="mid:51FFA7AF.6050407@iup.uni-heidelberg.de"
 type="cite">
  <meta content="text/html; charset=ISO-8859-1"
 http-equiv="Content-Type">
  <br>
Am 04.08.2013 17:52, schrieb DK1IS:
  <blockquote cite="mid:51FE78BA.9040603@kabelmail.de" type="cite">
    <meta content="text/html; charset=ISO-8859-1"
 http-equiv="Content-Type">
    <div class="moz-cite-prefix">[...]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>
</body>
</html>

--------------050106020506040500020408--