Thank you very much! Cheers Daniele Daniele Munaretto Researcher DoCoMo Communications Laboratories Europe GmbH Landsbergerstraße 312 80687 Munich Germany Mobile : +49- 162- 2919-218 Office : +49- 89- 56824-218 Fax : +49- 89- 56824-300 [EMAIL PROTECTED] visit us in http://www.docomolab-euro.com Managing Directors (Geschäftsführer): Dr. Toru Otsu, Dr. Narumi Umeda, Kazushige Yoshida Amtsgericht München, HRB 132967 -----Original Message----- From: Robert Szewczyk [mailto:[EMAIL PROTECTED] Sent: Thursday, May 24, 2007 8:00 PM To: Munaretto, Daniele Cc: [email protected] Subject: Re: [Tinyos-help] micaz,gain & tx power with eternal antennas
Danielle, 6 dBi antenna means in the main lobe, it will provide 6 dB gain over an idealized isotropic antenna. The directional antenna transmitting at -7 dB should give you performance comparable to a 0dBi antenna transmitting at maximum power (at least in free space). Additional comments: - a receiving antenna also provides gain along its main beam, so with two 6dBi antennas pointed at each other you should expect signal that's 12 dB stronger than that transmitted between a pair of nodes with 0dBi antennas. - typically, the larger the gain along the main lobe the smaller the secondary lobes. Cheers, Rob On 5/24/07, Munaretto, Daniele <[EMAIL PROTECTED]> wrote: > > > > > Dear all, > > > > I did other tests and removing the original antennas from the micaz motes > reduces the tx range. > > Now, I have a new question. > > > > If I fix to 15 the RFpower (CC2420), it means -7dBm, and the attached > directional antenna has a gain of 6 dBi, how should I consider the real TX > power of my mote? I have to sum up, consider only one of them, ..? I really > don't know and I cannot find documentation. For me it's important for > understanding if I can reduce and how much I can reduce the secondary lobes > of my external directional antennas. > > > > Please, if any one of you has experience, could you help me? > > > > Cheers > > Daniele > > > > > > > > > > > Daniele Munaretto > > Researcher > > > > DoCoMo Communications Laboratories Europe GmbH > > Landsbergerstraße 312 80687 Munich Germany > > > > Mobile : +49- 162- 2919-218 > > Office : +49- 89- 56824-218 > > Fax : +49- 89- 56824-300 > > > > [EMAIL PROTECTED] > > visit us in http://www.docomolab-euro.com > > > > Managing Directors (Geschäftsführer): > > Dr. Toru Otsu, Dr. Narumi Umeda, Kazushige Yoshida > > Amtsgericht München, HRB 132967 > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
