GPS Antenna - How to Improve Your Navigation with a GPS Antenna. Most GPS receivers have an antenna built in to them. The two most popular types of antennas used in GPS receivers are "patch" and "quadrifilar helix" or "quad helix" for short. This page addresses external GPS antennas which are normally used when stronger satellite signals are needed. (Browse all the other GPS articles and features.) Many models are mounted magnetically to the roof of a vehicle. The reasons to need anexternal GPS antenna: For use in a vehicle where the GPS receiver cannot or will not be placed near a window.For use when hiking under heavy tree cover or in canyons.For use in urban canyons (tall buildings).For use any place that the receiver doesn't have a good view of the sky.To minimize temporary loss of signal when in a vehicle in motion.To maintain the best possible accuracy by having a lock on the greatest number of satellites.
Types of GPS antennas Active What defines an "active" GPS antenna is the inclusion of a Low Noise Amplifier (LNA). Passive Reradiating. Wilson Mobile Amplifiers & Repeaters. Signal Boosters Including Cell Phone Antenna Adapters, Antennas. External Antenna - Page 5 - Droid Forum - Verizon Droid & the Mo. How-To: Add your own external GPS antenna. GPS is a nifty piece of technology.
GPS hardware needs to have a clear view of the sky because it's satellite based, so using your handheld unit can be a problem when the roof of your car is blocking signal reception. The obvious answer is to add an external antenna. The catch-22 is that many GPS units lack external antenna jacks. [Edit: Fixed the misspelling of NMEA in our diagram. (accursed nyquil) Thanks fabrizio] If you crack open your GPS, you could extend the wire between the antenna and the internal antenna, but the loss from the extra wire would degrade the signal.
But active antennas amplify the signal to get past the loss in the extra wiring; with a little bit of hacking, you can add an external active gps antenna to just about any GPS unit. To complete this project, you need: We wanted a low cost dedicated GPS receiver that could be mounted somewhere in the guts of our vehicle. How it works Satellites orbiting the earth transmit radio signals down to the earth. Building the coil.