Anyone has done a Comparison GTA02 GPS Antenna vs. Nokia N95?
We have seen that the N95 has a quite simple flexible PCB GPS antenna instead of the ceramic patch of the GTA0*. Does anyone of you own both, a N95 and GTA0*? The key issue is not overall sensitivity or TTFF but direction independence. I.e. does it matter much or less to rotate the device by 90 degrees. Any experiences in our community? Nikolaus ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Anyone has done a Comparison GTA02 GPS Antenna vs. Nokia N95?
Le 05/12/2011 10:14, Dr. H. Nikolaus Schaller a écrit : We have seen that the N95 has a quite simple flexible PCB GPS antenna instead of the ceramic patch of the GTA0*. Does anyone of you own both, a N95 and GTA0*? Not sur if relevant, but I have a N9 and a GTA02v5 The key issue is not overall sensitivity or TTFF but direction independence. I.e. does it matter much or less to rotate the device by 90 degrees. Any experiences in our community? Nikolaus ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Anyone has done a Comparison GTA02 GPS Antenna vs. Nokia N95?
On Mon, Dec 5, 2011 at 2:44 PM, Dr. H. Nikolaus Schaller h...@goldelico.comwrote: We have seen that the N95 has a quite simple flexible PCB GPS antenna instead of the ceramic patch of the GTA0*. Does anyone of you own both, a N95 and GTA0*? I have a N95 and a few GTA02s. Let me know what exactly do you want me to test re GPS? Rakshat ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Anyone has done a Comparison GTA02 GPS Antenna vs. Nokia N95?
Hi, Am 05.12.2011 um 15:51 schrieb rakshat hooja: On Mon, Dec 5, 2011 at 2:44 PM, Dr. H. Nikolaus Schaller h...@goldelico.com wrote: We have seen that the N95 has a quite simple flexible PCB GPS antenna instead of the ceramic patch of the GTA0*. Does anyone of you own both, a N95 and GTA0*? I have a N95 and a few GTA02s. Let me know what exactly do you want me to test re GPS? Great! Do you have some software for both that shows the satellite positions and (relative) signal strength? What will be interesting is if the GTA02 sees the satellites more uniform. The background is that the ceramic patch antenna in the GTA02/04 should have a more omnidirectional sensitivity while the N95 has just one flexible PCB with a long wire. And the latter should show some clear direction sensitivity. I.e. if the device is rotated some satellites should become weaker and others stronger. So far the theory we want to probe :) If the N95 antenna does not show such effects, we may have a cheaper approach for future GTA04 variants. And they may be more easily integrated into new cases than the 15x15mm ceramic block... Many thanks for any results, Nikolaus___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Anyone has done a Comparison GTA02 GPS Antenna vs. Nokia N95?
On Monday 05 December 2011, Dr. H. Nikolaus Schaller wrote: Hi, Am 05.12.2011 um 15:51 schrieb rakshat hooja: On Mon, Dec 5, 2011 at 2:44 PM, Dr. H. Nikolaus Schaller h...@goldelico.com wrote: We have seen that the N95 has a quite simple flexible PCB GPS antenna instead of the ceramic patch of the GTA0*. Does anyone of you own both, a N95 and GTA0*? I have a N95 and a few GTA02s. Let me know what exactly do you want me to test re GPS? Great! Do you have some software for both that shows the satellite positions and (relative) signal strength? What will be interesting is if the GTA02 sees the satellites more uniform. The background is that the ceramic patch antenna in the GTA02/04 should have a more omnidirectional sensitivity while the N95 has just one flexible PCB with a long wire. ?! Would that actually provide enough signal to get a lock without assistance? I ask partly because it may explain why a friend couldn't get a gps lock on an N95 when on deck on a yacht out of range of mobile networks. GTA02 was reliably coldstarting in ~40s as you'd expect with a clear sky view like that. You need significantly better signal to get the initial fix than to maintain it, as we found with the SD drive strength issue. And the latter should show some clear direction sensitivity. I.e. if the device is rotated some satellites should become weaker and others stronger. So far the theory we want to probe :) If the N95 antenna does not show such effects, we may have a cheaper approach for future GTA04 variants. And they may be more easily integrated into new cases than the 15x15mm ceramic block... Have you looked at an antenna like this? Smaller, cheaper and lower performance than a patch antenna, but probably significantly better than a wire. https://www.sparkfun.com/products/9131 Many thanks for any results, Nikolaus ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
