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 detected
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, but
temperature is lovely!
73, Marco IK1HSS
----- Original Message -----
From: "Stefan Schäfer" <[email protected]>
To: <[email protected]>
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 the
> 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, for
> you, and will inform you about the results! :-)
>
> 73, Stefan/DK7FC
>
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