# Xbee pro s1 distance problem

**URL:** <https://forums.digi.com/t/xbee-pro-s1-distance-problem/14059>\
**Category:** XBee - DigiMesh\
**Tags:** range, xbee-range-test-help, xbee\
**Created:** [December 10, 2014, 10:11am UTC](https://forums.digi.com/t/xbee-pro-s1-distance-problem/14059 "2014-12-10T10:11:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pie82](https://avatars.discourse-cdn.com/v4/letter/p/f9ae1b/32.png) [@pie82](https://forums.digi.com/u/pie82)\
**Post date:** [December 10, 2014, 10:11am UTC](https://forums.digi.com/t/xbee-pro-s1-distance-problem/14059/1 "2014-12-10T10:11:54Z")

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Hi,

I am using 4 series 1 xbee module 2.4ghz PRO s1 with digimesh fw version 8070.  
They works fine and are connected together in a mesh network that i can discover using the xctu software, but there is a problem, i am not be able to communicate with gateway if the motes are 5 meters away from it, when i perform the range test the RSSI value decrease (-100/-105dbm), i have already tried to increase PL=4, but RSSI value change to -98dbm and some pkt are lost… the xbee modules are all in line of sight so i can’t understand what could be the problem. Any suggestion??

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**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\
**Post date:** [December 10, 2014, 3:01pm UTC](https://forums.digi.com/t/xbee-pro-s1-distance-problem/14059/2 "2014-12-10T15:01:26Z")

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What do you refer to as Line of Site? It may be visually LOS but not RF LOS. How high above all obstructions are the gateway and modules?