Hi,
Just curious, in this case, the class 2 BT cannot transmit
power to class 1 BT as the distance is way out of range,
but
can class 1 BT transmit files to class 2 BT? since to
class
1 BT the class 2 phone is in range?
--ken
Message: 2
Date: Wed, 11 Apr 2007 08:47:53 +1200
From: Thomas Kear <thomas.kear gmail.com>
Subject: Re: [Bluez-users] using class 1 dongle
To: BlueZ users <bluez-userslists.sourceforge.net>
Message-ID: <200704110847.58296.thomas.keargmail.com>
Content-Type: text/plain; charset="iso-8859-15"
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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