User's Manual

AEON-9030 RF Repeater
User Manual V1.0
Advanced RF Technologies, Inc. Proprietary Document Page 20 of 51
2.3 Antenna Separation/Isolation
Separation between antennas is necessary to prevent oscillation.
Oscillation occurs when the signal entering the system continually re-
enters, due to the lack of separation between the donor and server antenna.
This creates a constant amplification of the same signal. As a result, the
noise level rises above the signal level.
To prevent feedback, the donor and server antenna must be separated by
an appropriate distance to provide sufficient isolation. Isolation is attained
by creating sufficient distance between the donor and nearest server
antenna so that the output of one antenna does not reach the input of the
other. This distance is determined by the gain of the repeater.
A sufficient isolation value is 13 ~ 15 dB greater than the maximum gain
of the repeater. The AEON-9030 has a maximum gain of 90 dB, thus it
requires an isolation of at least 103 ~ 105 dB.
Figure 15: RF Repeater Oscillation