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Hi Stefan,
maybe such a multicopter could be proposed as a
worthwhile investment for your university institute? Measuring CO
concentration at various altitudes, taking 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 ;-)
Best 73,
Markus
Sent: Thursday, August 08, 2013 8:34 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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