On Tue, Aug 28, 2012 at 10:52:46PM -0400, Kristopher Micinski wrote: > On Tue, Aug 28, 2012 at 10:45 PM, Felipe Silveira <[email protected]> wrote: > > I need this in an application which helps choose which external antenna type > > is indicated for each area. It is related to the signal frequency... > > Well, I don't know how to do it in the API, but that's probably me > being too lazy to look through the telephony classes,
I, on the other hand, got a degree in electronics, with a specialty in telecommunications. Cellular systems, both the old analog and the current digital cellular, work in specific frequency RANGES. The exact frequency you will use at any given time is determined when you either initiate a call and the local cell tower assigns you a frequency, or you're handed off from one tower to another, and the new tower assigns it. In other words, it changes frequently, and is something you don't control. As for the type of antenna, the last time I checked, that'd be vertically polarized (and it's NOT based on the frequency---it's the type of antenna used on cell towers---if you use horizontal polarization, and the tower's antenna is vertical (or any other mis-match in polarization), you lose about 25 dB. That's bad...that's VERY bad. If you need an external antenna, buy one designed and certified to work with your cellular service. You're not talking about amateur radio, where experimenting is not only ok, it's normal ... you're talking about the cellular provider's network, where it most definitely is not. Later, --jim -- THE SCORE: ME: 2 CANCER: 0 73 DE N5IAL (/4) | "This 'telephone' has too many [email protected] | shortcomings to be seriously considered < Running Mac OS X Lion > | as a means of communication. The device ICBM / Hurricane: | is inherently of no value to us." 30.44406N 86.59909W | (Western Union internal memo, 1876) Android Apps Listing at http://www.jstrack.org/barcodes.html -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
