User's Manual

Axell BSF3604-470-490-DP-AC (61-102001) Repeater

Product Description and User’s Manual

1.4.4 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.

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.

Equation (1) - Max SERVICE antenna gain

Max SERVICE antenna gain (dBi) = 39.1 – (37dBm - # of antennas in dB – cable losses in dB).

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

1.4.5 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 the signal booster

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 signal booster

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.

The BSF-3604 61-102001 Repeater has a noise level of -66 dBm in 10 kHz measurement at 1

MHz spectrum outside the passband of the signal booster and an in-band noise level at around -37

dBm in a 10 kHz bandwidth. Therefore, the noise at the antenna input port should be calculated

based on equation (2).

Equation (2) - Input Noise to service antenna

Input Noise to service antenna:

Noise level + Service antenna gain - Antenna splitter losses in dB - cable loss in dB