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Message-ID: <002c01ce9472$1a0cc470$0201a8c0@marco09cqcdi12>
From: "Marco Cadeddu" <marcocadeddu@tin.it>
To: <rsgb_lf_group@blacksheep.org>
References: <5202DE92.4040507@virginbroadband.com.au> <001101ce9428$e14548e0$0201a8c0@marco09cqcdi12> <5203E4A3.5050409@iup.uni-heidelberg.de>
Date: Thu, 8 Aug 2013 20:01:41 -0000
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Subject: Re: LF: Re: [OT] Quadrocopter antenna
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Hi Stefan,

I just visited the web site of Eurocopter they sell also "already owned"
helicopters, please note: not used but already owned!
This could be an easier way to lift without concerns a lamda quarter even
for 73 kHz!
If I can remember correctly the company should be a german-french joint
venture so could sponsor some test.

Leaving the jokes aside, thanks for think to me as possible investor, I
could give you a small electrical elicopter useful to lift even a quarter
wave for 6m, or a gasoline motor helicopter (10cc) which I guess can lift=
 1
kg for half an hour flight (but not GPS wizard on board!).

But, then if we are in position to put on the air a full quarter wave on =
136
I guess we loose the challenge and be bored very quickly!
I never thought to be able to send on LF from my city lot until I tried, =
but
leave to you to imaginate how happy and how incredulous was to be detecte=
d
almost 3000km away with a micro antenna! It was like to make a qso on 20m
with a 2m rubberduck!

Keep dreaming, enjoy experiments and get fun in all you do: life is too
short!

Have a nice evening here is not a LF evening with thunderstorm in act, bu=
t
temperature is lovely!

73, Marco IK1HSS
----- Original Message -----
From: "Stefan Sch=E4fer" <Stefan.Schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, August 08, 2013 6:34 PM
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
>