Return-Path: From: Thomas Kear To: BlueZ users Date: Wed, 11 Apr 2007 08:47:53 +1200 References: <57c68ddc0704071440m7b05678fs5c3bea4d2cf28a4c@mail.gmail.com> <2b1fa7660704080119s2275a60dm40655cbf9d6b3ba7@mail.gmail.com> <57c68ddc0704100617s3beb9f5cq52cc594522d27d08@mail.gmail.com> In-Reply-To: <57c68ddc0704100617s3beb9f5cq52cc594522d27d08@mail.gmail.com> MIME-Version: 1.0 Message-Id: <200704110847.58296.thomas.kear@gmail.com> Subject: Re: [Bluez-users] using class 1 dongle Reply-To: thomas.kear@gmail.com, BlueZ users List-Id: BlueZ users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1551579834==" Sender: bluez-users-bounces@lists.sourceforge.net Errors-To: bluez-users-bounces@lists.sourceforge.net --===============1551579834== Content-Type: multipart/signed; boundary="nextPart1300689.8HGi3V9zYb"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit --nextPart1300689.8HGi3V9zYb Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline 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 wi= ll > be established and data transfer will take place , but all this theory go= es > in vain . The problem is as simple as transmit power. As wikipedia helpfully shows=20 (http://en.wikipedia.org/wiki/Bluetooth#Uses), class 1 devices can have 40= =20 times the transmit power of class 2 devices, the class 1 connecting to clas= s=20 2 problem comes down to that past a certain range, the class 2 device does= =20 not have a high enough transmit power for its signal to reach the reciever= =20 (2.4GHz signals are eaten particularly fast by everything in their path,=20 including air). As i outlined before, the higher transmit power in a class 1 device will co= me=20 coupled to a higher sensitivity reciever, but that's not going to get you=20 100m. If you had got the 30-40 metres you were attempting in your original= =20 email you would have been extremely lucky. The problem is there are very few phones that come with class 1 bluetooth,= =20 100mW transmit power is a little hard on battery life. If you want a=20 challenge though, find a class1 bluetooth adapter that has a dipole aerial= =20 rather than the usual circuit board trace and attach a bigger one. --nextPart1300689.8HGi3V9zYb Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.3 (GNU/Linux) iD8DBQBGG/f+8/Qi7qeDfygRAh4EAKCkolUP+8SbzkuonzKD6/sXM8ZvvgCbBRhC KYEBIcY7gdAsagKLRruCztU= =9moC -----END PGP SIGNATURE----- --nextPart1300689.8HGi3V9zYb-- --===============1551579834== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- 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 --===============1551579834== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Bluez-users mailing list Bluez-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bluez-users --===============1551579834==--