| Publisher | SWS Security | ||
|---|---|---|---|
| Format | HTML | Date added | 14 Aug 2003 |
| Topics | Cellular Equipment | ||
| Downloads | 1 | ||
What determines the transmission range of surveillance and communications equipment, why you may not want longer range, and how to improve range if you do. We will break our discussion down to cover two areas: traditional two way radio communications, and surveillance work. They have two different sets of operational requirements although the technology affecting the two is very similar. Mobile radios have much better receivers primarily because they have room for much bigger and more effective filters. A mobile radio is designed to work with a larger antenna, knowing a lot more garbage will be picked up also. Cellular phone antennas mounted on the trunk lid or rear fender frequently are the "elevated feed" type. This means the antenna uses a small mast to raise the antenna above the level of the car's cab, so the antenna has a clear field of view in all directions.
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