Hi all,
I just gathered some informations from the web. Just one example for a,
probably, suitable hexacopter to carry a LF transmit antenna.
For example a DJI F550, see a video at
http://www.youtube.com/watch?v=veDrtdE6njo or
http://www.youtube.com/watch?v=2QC9so2so3Y). 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!!
I consider to buy one! And look this, most fascinating.
http://www.youtube.com/watch?v=JecyY79K7kY
73, Stefan/DK7FC
Am 05.08.2013 15:25, schrieb Stefan Schäfer:
Am 04.08.2013 17:52, schrieb DK1IS:
[...]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.
73,
Tom, DK1IS
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.
Maybe you can do some tests?
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 :-)
73, Stefan/DK7FC
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