using class 1 dongle

The "100 metre" range depends on both devices
being class 1.  If you
have a class 1 device talking to a class 2 (10m) device,
your maximum
range may be higher than 10 metres due to the increased
transmit power
and recieve sensitivity, but won't be anything like 100m.

Unlike 802.11 there is no user-adjustable transmit power
either,
you're stuck with the dongle figuring that out for you.

If your phone is class1 (a few are, but 99.5% are class2)
then you
genuinely have an issue, which could be as simple as a wall
in the way
which is blocking the signal, or as difficult as your
neighbour having
a leaking microwave oven.

On 08/04/07, siddhant tewari <siddhant.tewarigmail.com> wrote:
> hi,
>    I am using class 1 dongle which says it has 100 mt
range , but to my
> surprise using this dongle i cannot search my mobile
phone which are even
> around 30 - 40 mts.
>
> Are there any special commands which should be issued
to the microprocessor
> in the dongle so that its full range can be exploited.
>
> and
>
> Are there any set of instruction by which i can verify
the range of the
> dongle.
>
> Also can anyone tell me about the class 1 dongle they
use , their experience
> and the range to which their dongle can detect
devices.
>
> regards
> siddhant
>
>
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-- 
Thomas Kear
thomas.keargmail.com
+6421996496

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On Wed, 11 Apr 2007, siddhant tewari wrote:
>                  Really great to get a answer ... i
think my mobile phone
> has class 2 bt adapter ... but this issue is a real
shock for me ... i
> thought if any of the devices has a good range ,
communication channel will
> be established and data transfer will take place , but
all this theory goes
> in vain .
The problem is as simple as transmit power.  As wikipedia
helpfully shows 
(http://en
.wikipedia.org/wiki/Bluetooth#Uses), class 1 devices can
have 40 
times the transmit power of class 2 devices, the class 1
connecting to class 
2 problem comes down to that past a certain range, the class
2 device does 
not have a high enough transmit power for its signal to
reach the reciever 
(2.4GHz signals are eaten particularly fast by everything in
their path, 
including air).

As i outlined before, the higher transmit power in a class 1
device will come 
coupled to a higher sensitivity reciever, but that's not
going to get you 
100m.  If you had got the 30-40 metres you were attempting
in your original 
email you would have been extremely lucky.

The problem is there are very few phones that come with
class 1 bluetooth, 
100mW transmit power is a little hard on battery life.  If
you want a 
challenge though, find a class1 bluetooth adapter that has a
dipole aerial 
rather than the usual circuit board trace and attach a
bigger one.

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