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It varies. When constructing a cellular repeater system, a substantial distance is required to be kept between the internal rebroadcast antenna and the outside receiver antenna to prevent amplifier oscillation. This occurs when the external antenna starts picking up what the internal rebroadcast antenna is emitting. This results in the same lump of signal going into a feedback loop and will provoke the amplifier to reduce its power and/or shutdown.
Wilson Electronics: For example, these are the requirements for Wilson cell phone amplifiers:
- 50db amplifiers require 50 feet total separation.
- 60db 1900 Mhz Amplifiers require 68 feet total separation.
- 60db 800 Mhz Amplifiers require 75 feet of total separation.
This 'total separation' is measured from inside antenna to outside antenna and so may span the length of two cables (one connecting the amplifier to the external antenna and one connecting the amplifier to the internal antenna). Therefore, if you were using a 50db Wilson Amplifier you might purchase a 30 ft. cable to connect your external antenna to the amplifier and a 20 ft. cable to connect your internal antenna to the amplifier - together totaling the required 50 ft. of separation.
Check Instruction Manuals. Cell Phone Amplifiers which require extension cables to be purchased separately, all have detailed instructions which will provide information as to which cable length you need. These can be previewed on each product page or in our Product Resources section.
We can help. If it is not clear which cables/amplifier configuration is right for you, you can give us a ring on 1-800-761-3041 and we can tell you which options are best for you.
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