User's Manual

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Page 43
INSTALLATION GUIDE FOR RX-7W22, II2
7 APPENDICES
7.1 APPENDIX A:
Antenna installation:
Installation of an antenna must comply with the FCC RF exposure requirements. The antenna used for this
transmitter must be mounted on permanent structures.
The FCC regulations mandate that the ERP of type B signal boosters should not exceed 5W, this is
equivalent to 8.2W EIRP (39.1dBm).
Therefore the max antenna gain allowed for this type of signal booster should be limited to the values given
by equation 1 (below) for the service antenna.
For example:
No. of Antennas
Cable losses
Max Allowed Antenna Gain
4
3
39.1-(37-6-3)=11.1dBi
1
3
39.1-(37-0-3)=5.1dBi
10
3
39.1-(37-10-3)=15.1dBi
Compliance with FCC deployment rule regarding the radiation of noise
Good engineering practice must be used in regard to the signal booster’s noise radiation. Thus, the gain of
the signal booster should be set so that the ERP of the output noise from PS BDA should not exceed the
level of -43 dBm in 10 kHz measurement bandwidth.
In the event that the noise level measured exceeds the aforementioned value, the PS BDA gain should be
decreased accordingly.
In general, the ERP of noise on a spectrum more than 1 MHz outside of the pass band should not exceed -
70 dBm in a 10 kHz measurement bandwidth.
RX-7W22 PS BDA has a noise level of -40.55dBm in 10 kHz measurement at 1MHz spectrum outside the
pass band of BDA and an in-band noise level at around -23.64 dBm in a 10 kHz
bandwidth. Therefore, the noise at the antenna input port should be calculated based on equation (2).
For example: in band noise
RX-7W22 PS BDA connected to 10 service antennas with a 100m long ½ inch cable.
Losses of such a cable with the connectors = 12dB
Assuming 10 service antennas: antenna splitter losses = 10 dB
Based on equation (2) Input antenna noise (to the antenna) = – 23.64 – 12 –11=-46.64 dBm ERP
Equation (2) – Input Noise to service antenna
Input Noise to service antenna:
-23.64dBm – antenna splitter losses in dB – cable loss in dB
Equation (1) – Max Service antenna gain
Max Service antenna gain (dBi) = 39.1-(37dBm-# of antennas in dB – cable losses in dB).