User Manual

AXELL 3604 A284 SERIES UHF REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd DOC PN 3604 A284Series-UM Rev. 2.1 VI
Example:
Signal booster connected to 10 service antennas with a 100m long ½ inch cable.
Losses of such a cable with the connectors = ~ 11dB
Gain = ~ 2 dBi
Assuming 10 service antennas: antenna splitter losses = 11 dB
Based on equation (3) Input antenna noise (to the antenna) = -53+2-11 -11=-73 dBm
The inband input noise to the antenna should be -34+2 -11-11= -54dbm
NOTE: In this example there is no need to add an external band pass filter to attenuate the out of
band noise.
Conclusion:
Good engineering practice requires that in general when the out of band noise measured at
the service antenna input is more than -70 dBm per 10 kHz measurement bandwidth, an
external band pass filter should be added to attenuate the out of band noise level.
All Axell Wireless repeaters include high selectivity duplexers and filters to attenuate the out
of band noise. Should additional filtering be required, we have a comprehensive range of
interference filters which can be supplied upon request.