[Bluez-users] using class 1 dongle

[Bluez-users] using class 1 dongle

[siddhant tewari]

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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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Re: [Bluez-users] using class 1 dongle

[Thomas Kear]

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.tewari@gmail.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.kear@gmail.com
+6421996496

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Re: [Bluez-users] using class 1 dongle

[siddhant tewari]

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hi Thomas,
                 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 .

Can u tell  why this things happen (both the devices should be class 1 ) or
where can i look  for the reasons for such a behavior, because i need to
inform this to one of my project head and knowing the reason will always
help ......

waiting for reply

regards
siddhant

On 4/8/07, Thomas Kear <thomas.kear@gmail.com> wrote:
>
> 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.tewari@gmail.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
> >
> >
> -------------------------------------------------------------------------
> > Take Surveys. Earn Cash. Influence the Future of IT
> > Join SourceForge.net's Techsay panel and you'll get the chance to share
> your
> > opinions on IT & business topics through brief surveys-and earn cash
> >
> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> > _______________________________________________
> > Bluez-users mailing list
> > Bluez-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bluez-users
> >
> >
>
>
> --
> Thomas Kear
> thomas.kear@gmail.com
> +6421996496
>
> -------------------------------------------------------------------------
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> https://lists.sourceforge.net/lists/listinfo/bluez-users
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Re: [Bluez-users] using class 1 dongle

[Thomas Kear]

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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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Re: [Bluez-users] using class 1 dongle

[Kenneth Liew Jau Tze]

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-users@lists.sourceforge.net>
Message-ID: <200704110847.58296.thomas.kear@gmail.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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Re: [Bluez-users] using class 1 dongle

[siddhant tewari]

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what i think is that for any kind of transfer to take place (for e.g. via
obex push or obex ftp profile) both way handshakes are necessary to
instantiate the transfer ....


  Just curious, in this case, the class 2 Bdshannot 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-users@lists.sourceforge.net>
> Message-ID: <200704110847.58296.thomas.kear@gmail.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.
> -------------- next part --------------
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>
> ------------------------------
>
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