User's Manual
DocumentName:MARSBoxUserManual VersionNo:0.2
CompanyName:NextNav,LLC.
Confidential Page9 5/24/2013 Page9of9
3.2 Tune-up procedure not to exceed maximum TX power
ACSVfile(configurationfile)pertransmitterarecreatedbytheNOCengineerbasedonthe
installationparameterssuchaslinelengths,antennatypeetc.
The TX output power level setting is contained in the CSV file.
The output power is adjusted by the ‘attenuation’ setting. This value in the CSV file is
calculated by a formula to set the output power (not to exceed 4W EIRP). The variables used
in the calculation include PA Gain (G
pa), TX Antenna Gain (Gant), TX filter insertion loss
(ILflt), internal cable loss (ILint), external cable loss (ILext), and transceiver output power
(P
TCVR).
EIRP(W)=10^((P
TCVR‐ILint+Gpa‐ILflt‐ILext+Gant)/10)/1000
3.3 GPS Receive Antenna
GPSantennashouldbeins talledsuchthatithasclearviewofsky.Ideally,youwouldkeepthe
antennaclosetothegroundawayfromobstruction
• Keepanyhorizontalblockagesmallerthan10degrees
• ObstructionClearanceguideline
– Ifitis1ftwideitshouldbeatleast
6ftaway
– Ifitis10ftwide,itshouldbeatleast60ft.away.
– Ifitissignificantlylessthan1ftwide(likeaguywire,orapost)itshouldnotcauseany
measurableeffect