Installation guide

Determining the Antenna Locations
RoamAbout Antenna Site Preparation and Installation Guide 1-3
Determining the Antenna Locations
Thefollowingfactorsdeterminethelocationswhereyoucanplacetheantennasrelativetoone
anotherandthedistancesbetweenthem:
•Typeofantennas.TheRoamAboutantennasaredescribedinAntennaModelsonpage 1‐9.
•LengthofcableconnectingtheantennatotheAP.
• Dataraterequired.
•InaLAN‐to‐LAN
network,thedistancebetweenthebuildings.
• Obstructionsinthesignalpath.
•Inawirelessinfrastructurenetwork,theareaaroundtheantennawhereclientsneedto
communicatewiththeAP.
Typically,theRoamAboutdirectionalandomni‐directionalantennasareinstalledonrooftops.
Thedirectionalantennacanalsobeinstalledonthesideof
abuilding.Thefollowingsections
describethefactorsthataffecttherangeoftheantennas.
Distances with Cables
Table 1‐2liststhedistancesfortheRBT‐4102,RBT‐4102‐EU,andtheRBT‐4102‐BG.Thedistances
includethecablesatbothends.Forevery6dBiofcableloss,dividethedistancebytwo.Forevery
10dBiofcableloss,dividethedistancebythree.
.
Notes:
• Be sure to calculate the cable loss at both ends, and include the pigtails.
• The distance miles listed are approximate.
• If the RBT-4102-EU uses one 8 dBi (RBTES-BG-M08M) to one or more 14 dBi sector
antenna(s), you will get approximately half the distances shown in Tab le 1 -2 using the 2.4 GHz
band.
Table 1-2 Outdoor Distance Matrix Between Antennas (RBT-4102 LAN to LAN/MultiPoint)
GHz Antenna Cables used
Signaling
Rate Throughput Miles
5.7 - 5.8 RBT-AH-P23M
(23 dBi to 23 dBi)
For use in North America
only.
Pigtail and the
LMR-600-C25F at
each end
54 Mbit/s
36 Mbit/s
24 Mbit/s
6 Mbit/s
21 Mbit/s
17 Mbit/s
13 Mbit/s
4.5 Mbit/s
2
4
6
8
Pigtail and the
LMR-600-C50F at
each end
54 Mbit/s
36 Mbit/s
24 Mbit/s
6 Mbit/s
21 Mbit/s
17 Mbit/s
13 Mbit/s
4.5 Mbit/s
1.2
2.4
3.5
5
Pigtail and the
LMR-400-C50 at
each end
54 Mbit/s
36 Mbit/s
24 Mbit/s
6 Mbit/s
21 Mbit/s
17 Mbit/s
13 Mbit/s
4.5 Mbit/s
0.8
1.6
2.3
3.3