Question about Enfora Spider B3 Booster with GPS (CDP0102) Repeater

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I work in the GPS industry and I am looking for a way to transmit a gps signal from a basement of a concrete building. A little background, I work for a company that monitors *** offenders. I work in a basement of a 3 story court house and every time I ?activate? a gps bracelet I half to walk outside to get a gps signal and wait 3 to 30 min. I am looking for a booster that I can set into a window and boost a gps signal so I don?t half to waste time walking back and forth to activate this gps monitoring device. Does you you know of a system fit my needs? If not can you point me into the right direction? Thank you in advanced for any advice.

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I don't think that would be legal unless something is type accepted by the FCC for the satellite frequencies that are involved. It probably wouldn't be a good idea if the public were to start "repeater" transmissions on the GPS satellite bands. They do that in Cellular ... and they even often have problems there with "repeater"s going into oscillation between the outside and inside antenna if installed incorrectly - which tears up cellular companies towers.

If there isn't anything made legally to do this, and you were to make something without FCC acceptance, then you'd become the offender and could end up wearing the same gps bracelet you're working on.

If ... the gps devices would take an external antenna, then you could run an outside antenna and jack that in for testing and activation.

Posted on Nov 22, 2009

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1 Answer

Why doesn't the GPS pick up a current GPS signal?


You may need to do it outdoors; a building may interrupt enough satellite signal that it (the GPS) won't lock to it (the signal).

If it always says "GPS SIGNAL NOT DETECTED" when it's outdoors, I don't think you're going to get it to ever work. It may have been dropped & the internal antenna damaged.

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Often, when your GPS is in a "covered" area ... e.g. inside a building, in a tunnel, under a bridge, amongst / under tall buildings, etc... when there is no open space (directly) between your GPS and the satellites, your GPS will loose its satellite signals. If you're in such locations, try to find some "open space" and wait a bit for the signals to be picked up again.
Another common reason why the GPS doesn't get signals, or doesn't get the signals quickly, is because the "latest" satellite positions (locations) have not been updated in your GPS. If/when you connect your GPS to your computer (e.g. using HOME ) and download the GPS satellite (QuickFix) location information, your GPS will have the most recent locations of the satellites in your vicinity/region. With this information, your GPS can pick up the signals more quickly ... instead of having to search/scan around to find the signals ... which can take a bit more time. While your GPS is searching for the satellite signals, it shows the "signal lost" or "no GPS signal" message.

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Being plug into a car charger (or wall charger) has little to do with not finding a GPS signal and this apply to your gps battery as long as you get power to your receiver.

It is not unusual for GPS to have problem finding suitable Satellites signals especially inside a building or areas where you do not have a clear view of the sky above you and the unit (e.g. High Rise buildings).

In order to speed up the location of satellites signals, you need to update your unit A-GPS Satellite locations database on a regular basis via 'Tom Tom Home' (which should be installed on your PC or Laptop). You can download the latest version of Tom Tom Home from the official site.

Without A-GPS and the unit not being in regular use, your unit may take a very long time to find suitable satellite signals. My own TomtOm One, without an up to date a-gps database has taken over 15 minutes to locate the required signals even in a relatively 'open' air location!

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Usually, when it's waiting to get a valid GPS signal, it is "listening" (scanning) for satellite signals to establish your current location. If you are in the open outdoors, i.e. not inside a building or under extended covers, it should get the satellite signals within a minute or so.

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Poor gps


My friend, this is the first time I have seen your question. Please understand, the people on this side of the counter are not employees of FixYa.com. We are a gaggle of volunteers working from our homes and offices, for free. I have never actually seen another volunteer worker associated with this web site.

I say all that to explain I don't have any history on your question...

If your GPS says you are in a building ... it is being nice when it says that. It is redally telling you it has no, little or poor signal reception. You can be outside and still not have a clear view of the sky. Your GPS wants a unobstructed view to find the signals from above. Other buildings, trees, etc. in the area can prevent this view.

If you are out in a field, for example, and it still tells you this - you should be asking Tomtom what to do. There is probably something they can do to help your signal reception. You could have a antenna or battery issue.

Thanks for your interest in FixYa.com

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Unfortunately it appears the iPhone's GPS chip isn't up to much as we've all suspected. Some people can get it working while many are reporting, like you, that they get drop outs and poor signal strength errors. This is happening accross all the iPhone Sat Nav apps so it points the finger at the GPS chip itself, especially as many of these people are stating they have dedicated tomtoms and the like that work fine. I've tried Copilot, tomtom and others on the iPhone 3GS and none are able to keep signal long enough to be any good. In fact they are a complete waste of money. It's no suprise Tomtom are releasing a cradle for the iPhone which includes a seperate more powerful GPS receiver...

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See here for the details of how a GPS works:
http://electronics.howstuffworks.com/gadgets/travel/gps.htm

Hope that helps you...

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1 Answer

I recently bought a Garmin 200W Widescreen satnav. I have tried and found a satelite but each time when I take back indoors I loose it, is there anyway to lock the signal in after acquiring.


Hello snippey,

Global Positioning System satellites transmit radio signals which are received by your GPS receiver unit. Your GPS receiver uses these signals to calculate its current location, speed and altitude.

The GPS is not able to perform these calculations unless it is actually able to receive the radio signals from the satellites. Radio signals can be blocked by obstructions such as tall buildings, heavy foliage, tall hills and mountains, etc. Anything that prevents your GPS receiver from having a clear view of the sky will affect it's operation. This includes attempting to use the unit indoors or inside of a vehicle without an external antenna.

There is no way to "lock" the signals in. The GPS simply must be able to receive the signals and in order to do that it needs to be able to "see" the sky.

Hope this helps,
Ken
"Go Ahead. Use Us."

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