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Message-ID: <5204124C.603@iup.uni-heidelberg.de>
Date: Thu, 08 Aug 2013 23:49:00 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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References: <5202DE92.4040507@virginbroadband.com.au> <001101ce9428$e14548e0$0201a8c0@marco09cqcdi12> <5203E4A3.5050409@iup.uni-heidelberg.de> <2D8E764F8D76417B9A12E0A2C1904E87@White>
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Subject: Re: LF: Re: [OT] Quadrocopter antenna
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Hi Markus,

I also had that thought! I even/already thought about a landing platform=20
on the institutes roof, including 2 plates to make a contact for an=20
automatic charging station!! :-) My holidays is over next week and i=20
will ask, carefully, the right people :-)

73, Stefan

Am 08.08.2013 21:45, schrieb Markus Vester:
> Hi Stefan,
> maybe such a multicopter could be proposed as a worthwhile investment=20
> for your university institute? Measuring CO concentration at various=20
> altitudes, taking air probes, wind profiles and turbulence, you name=20
> it - all environmental physics! And of course you'd be the one=20
> designing and testing the telemetry system ;-)
> Best 73,
> Markus
>
> *From:* Stefan Sch=E4fer <mailto:Stefan.Schaefer@iup.uni-heidelberg.de>
> *Sent:* Thursday, August 08, 2013 8:34 PM
> *To:* rsgb_lf_group@blacksheep.org <mailto:rsgb_lf_group@blacksheep.org=
>
> *Subject:* Re: LF: Re: [OT] Quadrocopter antenna
>
> Hi Marco,
>
> Am 08.08.2013 13:17, schrieb Marco Cadeddu:
> > Beyond my concerns, my congrats in advance if somebody will try it!
> >
> > 73 de Marco IK1HSS
>
> Yesterday i had a phone call to a German shop who sells that DJI F550
> hexacopter. I got some more technical deteils and prices. Without the
> camera option, just the flying hexacopter, LiPo accus, remote control,
> GPS navigation + sensors, 2.4 GHz link hardware, charging station, the
> costs are in the range of 1000 EUR.
> That is more expensive than my car (10 years ago)! :-)
> Of course it would be most fascinating, not only for amateur radio
> experiments. Anyway i still fight with myselfe if i should invest so
> much money for that stuff.
>
> On the other side i'm dreaming (!) ;-) about a 500m vertical or so.
> Think about a MF transmitter that is connected to an antenna wire of
> variable length. The ground losses are low, maybe here on the top of th=
e
> building. An amperemeter is already connected. The current is low,
> first. Then you start the hexacopter and start to lift it. The wire is
> rolled up and connected at the far end. Then the height reaches lambda/=
4
> and you can suddenly see the antenna current rising :-) As long as the
> system is running on batteries only, one could use a simple
> non-conducting line, say 20m long. Guess there will be no EMS problems
> then. A power supply from the ground is a complete differnt thing.
>
> Could it be possible to rise a lambda/4 for 2200m?
>
> I have an idea: You will buy the equipment and i do the experiments, fo=
r
> you, and will inform you about the results! :-)
>
> 73, Stefan/DK7FC
>

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Hi Markus, <br>
<br>
I also had that thought! I even/already thought about a landing
platform on the institutes roof, including 2 plates to make a contact
for an automatic charging station!! :-) My holidays is over next week
and i will ask, carefully, the right people :-)<br>
<br>
73, Stefan<br>
<br>
Am 08.08.2013 21:45, schrieb Markus Vester:
<blockquote cite="mid:2D8E764F8D76417B9A12E0A2C1904E87@White"
 type="cite">
  <meta http-equiv="Content-Type"
 content="text/html; charset=ISO-8859-1">
  <meta content="MSHTML 6.00.6000.21342" name="GENERATOR">
  <div><font face="Arial" size="2">Hi Stefan,</font></div>
  <div>&nbsp;</div>
  <div><font face="Arial" size="2">maybe such a multicopter could be
proposed as a worthwhile investment for&nbsp;your university institute?
Measuring CO concentration at various altitudes, taking&nbsp;air probes,
wind profiles and turbulence, you name it - all environmental physics!
And of course you'd be the one designing and testing the telemetry
system ;-)</font></div>
  <div>&nbsp;</div>
  <div><font face="Arial" size="2">Best 73,</font></div>
  <div><font face="Arial" size="2">Markus</font></div>
  <div>&nbsp;</div>
  <div
 style="font-family: Tahoma; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
  <div><br>
  </div>
  <div
 style="background: rgb(245, 245, 245) none repeat scroll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;">
  <div style=""><b>From:</b> <a moz-do-not-send="true"
 title="mailto:Stefan.Schaefer@iup.uni-heidelberg.de
STRG + Klicken, um Verkn&uuml;pfung zu folgen"
 href="mailto:Stefan.Schaefer@iup.uni-heidelberg.de">Stefan Sch&auml;fer</a>
  </div>
  <div><b>Sent:</b> Thursday, August 08, 2013 8:34 PM</div>
  <div><b>To:</b> <a moz-do-not-send="true"
 title="rsgb_lf_group@blacksheep.org"
 href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a>
  </div>
  <div><b>Subject:</b> Re: LF: Re: [OT] Quadrocopter antenna</div>
  </div>
  </div>
  <div><br>
  </div>
Hi Marco,<br>
  <br>
Am 08.08.2013 13:17, schrieb Marco Cadeddu:<br>
&gt; Beyond my concerns, my congrats in advance if somebody will try it!<br>
&gt;<br>
&gt; 73 de Marco IK1HSS<br>
  <br>
Yesterday i had a phone call to a German shop who sells that DJI F550 <br>
hexacopter. I got some more technical deteils and prices. Without the <br>
camera option, just the flying hexacopter, LiPo accus, remote control, <br>
GPS navigation + sensors, 2.4 GHz link hardware, charging station, the <br>
costs are in the range of 1000 EUR.<br>
That is more expensive than my car (10 years ago)! :-)<br>
Of course it would be most fascinating, not only for amateur radio <br>
experiments. Anyway i still fight with myselfe if i should invest so <br>
much money for that stuff.<br>
  <br>
On the other side i'm dreaming (!) ;-) about a 500m vertical or so. <br>
Think about a MF transmitter that is connected to an antenna wire of <br>
variable length. The ground losses are low, maybe here on the top of
the <br>
building. An amperemeter is already connected. The current is low, <br>
first. Then you start the hexacopter and start to lift it. The wire is <br>
rolled up and connected at the far end. Then the height reaches
lambda/4 <br>
and you can suddenly see the antenna current rising :-) As long as the <br>
system is running on batteries only, one could use a simple <br>
non-conducting line, say 20m long. Guess there will be no EMS problems <br>
then. A power supply from the ground is a complete differnt thing.<br>
  <br>
Could it be possible to rise a lambda/4 for 2200m?<br>
  <br>
I have an idea: You will buy the equipment and i do the experiments,
for <br>
you, and will inform you about the results! :-)<br>
  <br>
73, Stefan/DK7FC<br>
  <br>
</blockquote>
</body>
</html>

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