That's worth mentioning, generally the stats reported by telephony hardware are "highly nominal" at best and will change or fluctuate quite a bit depending on the protocol, etc...
(I also have an EE degree, and can attest to most hardware being kind of flakey..) kris On Wed, Aug 29, 2012 at 1:01 AM, Jim Graham <spooky1...@gmail.com> wrote: > On Tue, Aug 28, 2012 at 10:52:46PM -0400, Kristopher Micinski wrote: >> On Tue, Aug 28, 2012 at 10:45 PM, Felipe Silveira <webfel...@gmail.com> >> 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 > spooky1...@gmail.com | 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 android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
