Re: GSM/GPRS connection from a balloon
- From: Paul Keinanen <keinanen@xxxxxx>
- Date: Mon, 13 Aug 2007 08:51:03 +0300
On Mon, 13 Aug 2007 04:52:57 -0000, Albert Goodwill
<albertgoodwill@xxxxxxxxx> wrote:
Hello Everybody,
Expert advise required on GSM/GPRS connection;
I want to send/receive data to/from a balloon carrying some sensor.
Initially balloon will be tight to a rope and will rise gradually in
human control.
It will send altitude, temperature, humidity, windspeed, GPS data via
GSM/GPRS module to a control computer and to a mobile phone on the
ground. It will also receive some remote control commands through the
same communication channel.
- How high the balloon can rise before GSM/GPRS signal vanishes?
The time slot adjustment limits the distance to base station to 35 km,
although the phone will show strong base station signals from base
stations further away, but you can not get a connection.
The base station antenna radiation pattern is centered below the
horizon and you usually have a deep null directly upwards. Thus, you
might not get a connection directly above the base station, even if
the balloon is flying below 35 km. However, in practice, any buildings
or objects could reflect the signal from directly above into the
antenna main lobe.
- Is there a legal altitude limit for GSM/GPRS operation?
You have to check the national regulations, some countries ban the
airborne operation of most radio transmitters.
Paul
.
- References:
- GSM/GPRS connection from a balloon
- From: Albert Goodwill
- GSM/GPRS connection from a balloon
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