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Lee10114

External antenna

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What's recommended is the cable that comes with the external antenna package - 20 meters. And @Dodong_Jan2x is correct - the longer the cable is, the higher the data loss will be.

 

WE07

 

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At 900MHz, the LMR400 coax has approx. 4dB of signal loss per 100 feet.  This means with using the supplied coax length in the antenna kits, (20 meters/66 feet) loss is approx. 2.5dB.  I always tell installers it's best to relocate the base closer to where you want the antenna than to use more coax.  You can typically run telephone line up to 1500 feet from the PBX without much problem so moving the base is much better than using a whole bunch of coax.  That being said, you can run more coax, just know that you introduce more loss.  Sometimes, it's "worth" doing.  If running 125 feet of coax means you now are above a major obstruction, then that extra 2-3dB of loss may be negligible compared to the maybe 10+dB attenuation from the obstruction.  Use the RSSI signal tool in the handset to get the -dbm readings before permanently installing the antenna system.

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