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AXELL D-CSR 3302 US VHF REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd DOC PN 0034B-UM REV. 2.1 V
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 regulation mandate that the ERP of type A 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) for the service antenna and equation (2) for the donor
antenna
Equation (1) - Max SERVICE antenna gain
Max SERVICE antenna gain (dBi) = 39.1 – (33dBm - # of antennas in dB – cable losses in dB).
For example:
No. of Antennas
Max Allowed Antenna Gain
4
39.1 - (33-6-3) = 15.1dBi
1
39.1- (33-3) = 9.1dBi
10
39.1- (33-10-3) = 19.1dBi
Equation (2) - Max DONOR antenna gain
Max DONOR antenna gain (dBi) = 39.1 – (27dB - cable losses in dB).
For example:
No. of Antennas
Max Allowed Antenna Gain
1
39.1 - (27-2) = 14.1dBi
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
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 3302 signal booster has a noise level of -55 dBm in 10 kHz measurement at 1 MHz
spectrum outside the passband of the signal booster and an in-band noise level at around -
50 dBm in a 10 kHz bandwidth. Therefore, the noise at the antenna input port should be
calculated based on equation (3).
Equation (3) - Input Noise to service antenna
Input Noise to service antenna:
-55 dBm + Service Antenna gain – Antenna splitter losses in dBi – cable loss in dB