Cell Phone Base Antenna

Calculate (estimate) the optimal antenna length of your cell phone based on the frequency band, If you can..

GSM - Sony ericcson 580i..
It is quadra band mean is useful in 850, 900, 1800, 1900 frequency..

2008-10-17 01:11:21 by Axay

www.quantum-wireless.com Designed for consumers, the zBoost cell phone signal booster extends a zBoost Cell Zone for single or multiple users in ...

Given that signal strength is measured, is it not possible to measure signal strength to a number of cell antenna and triangulate position based on that? If not, why not?

http://en.wikipedia.org/wiki/Mobile_phon e_tracking

the reason is because the cell phone can only physically communicate with one cell site at a time.

to do a triangulation, you would need the phone to send its position to three different cell sites, and then calculate its position based on that.

doing this would require the phone to know how to disconnect itself from a cell site that it has full service from. that is kind of counter-intuitive for a cellphone.

the guy who answered after me is a little confused abotu what the original iphone does...it uses location based services to tell you where you are NEAR. It does ti by connecting to the ONE cell site you are connected to, and then estimating where you are at, knowing you have to be witihin a certain distance from that tower. It shows a dot where the cell site is at, and then a ring around it showing where you might be. Its similar to triangulation, but not nearly as accurate.

2009-01-14 14:23:33 by Blueflash

Price: $39.95 $18.89

Metal ground plane is required (Minimum 5" diameter
Removable - Transfers from on Vehicle to another
Greatly reduces the number of dropped calls.
Rare Earth Magnet Guaranteed up to 100 MPH
Easy to install

The tower is 40 feet from my house.The micro tower uses CDMA technology and its antenna is placed higher than my building. One Dish antenna is placed at 60 feet and three verticle antenne at 40 feet.

well, there are many opinions on it. my friend lives near the gsm-antenna tower. and he didn't become a mutant or something (yet :)))) ) but I've read that if you speak too much via cell phone you can get a headache or something. and i think that radiation from big antenna is more intensive than from a cell-phone. don't approach closely to that tower and everything will be alright :)

2006-07-22 00:35:05 by Ram

Price: $299.99

Boost indoor signal coverage up to 1500 square feet
Requires no cradle or connections to your phone
No outside antenna placement required
Increases voice and data transmission; decreases dropped or missed calls
Extends phone battery life (uses less power when signal is stronger)

Since Onstar is a GM option, is the factory mounted antenna something for a car phone from that year model?

Jeep is not a GM product, maybe a phone antenna.

2008-07-30 14:32:43 by Grizzly292

I asked this in "Cell Phones" but didn't get any legit response. Hopefully you electronics folks will be more helpful.

I have seen some “passive repeater” products designed for vehicles that consist of an antenna that sits on top of another smaller device located inside a vehicle that re-transmits the signal. Some of these boast of a 6db gain. I would like to be able to do the same sort of thing but using an existing “yaggi” antenna as the source with the smaller “passive repeater” unit placed such that I can get reasonable wireless reception in an immediate "base camp" area.

I am not interested in spending several hundred bucks on an active repeater that requires external power. I am, however, willing to purchase one of the passive automobile repeaters and hack it such that it uses the existing “yaggi” as the source signal.

Any practical advice on how to make this work?

Any pointers to low cost passive repeater products that have a connection for an external antenna?

The "passive repeaters" used in vehicles will not work in your application. They consist solely of two aerials coupled together; any claim of gain is dubious at best, though you may get a greater erp in one direction if they use a directional aerial (such as your Yagi). Incedentally, 6dB is only double the power (sounds good but the receiver won't notice the difference), easily obtained by adding a reflector to form an H, as often seen on rooftops.

It's not totally clear what you want to do. If you need to cover an area of poor or no reception, you will need an active relay. If your phone does not need to be portable, then you cold try an external aerial connected by cable to the handset, but that obviously negates the advantage of having a mobile in the first place.

By all means experiment with your passive repeater; you have nothing to lose. Bear in mind, though, that the more elements the aerial has, the greater the gain but the narrower the beam, and at the frequencies involved here construction his to be very accurate.

The sites listed below should provide food for thought.

2006-10-18 07:09:25 by PraiseBob