User Manual

NovaRoam EH900 User Manual
V. 1.1
Page 70
Appendix D: Antenna/Cable
Requirements
The NovaRoam EH900 must be installed by a professional in order to comply
with FCC Part 15 radiated power limits. Furthermore, only antennas supplied by
Nova Engineering may be used with the NovaRoam EH900.
The FCC mandates that the Effective Radiated Power (ERP) may not exceed +36
dBm. This is equivalent to a NovaRoam EH900 running at full output power (1
watt/+30 dBm) with a +6 dBi antenna. The antenna cable must have sufficient
loss to push the ERP to below +36 dBm if a higher gain antenna is used. For
example, using a +8 dBi antenna with the NovaRoam at full power would result in
an ERP of +38 dBm. In this situation, the antenna cable must provide at least 2
dB of loss in order to bring the ERP into compliance.
The NovaRoam EH900 also features the ability to decrease the transmit power.
Any decrease in output power should be considered when calculating ERP.
The following table provides the amount of loss incurred by several common
types of antenna cable.
Table 4: Antenna Cable Loss
Type of Antenna Cable Loss per 100’ of cable
LMR-400 3.9 dB
LMR-600 2.5 dB
LMR-900 1.7 dB