| Electronics > Projects, Designs, and Technical Stuff |
| Roof mounted GPS for positioning only |
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| Miti:
Don’t remember exactly but somewhere under a thousand quids. |
| Fraser:
GPS rebro units are not uncommon. They comprise a decent external GPS antenna with good gain of around 30dB to 40dB. The low loss coaxial cable feeds into the rebro location and is either distributed by an amplified splitter or directly feeds the rebro antenna unit. The rebro antenna unit contains a tuned amplifier with a gain set for the coverage area required. The antenna tends to be a gain type where a coverage area is a long open plan area. A flat patch antenna is common. Omni directional antennas can be used but tend to be for smaller area coverage. A simple dipole is used for a test bench setup for instance. It should be noted that these systems are anything but efficient but they get the job done. Buying a proven complete system would save a lot of time and experimentation. Hobbyists have the free time and can purchase surplus amplifiers etc. For a professional commercial grade installation, companies produce complete kits of parts as has already been stated. DIY systems can suffer self oscillation related issues and even professional installations need to be wary of too much amplifier gain leading to self oscillation through coupling of the rebro antenna with leaky feeder coax or even the main antenna input, if not far away. Fraser |
| edpalmer42:
--- Quote from: Miti on February 23, 2020, 09:45:09 am ---Take a look at this: https://www.gps-repeaters.com/ I don’t know what your budget is but I installed one of this at work for functional test and it works well. --- End quote --- At the bottom of the page on this site, there's a link to a page on licensing. To summarize: U.S. and U.K. - a license is required, Canada - a license is required but they probably won't give you one. ;) Ed |
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