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BevFlex-4X Installation Manual Rev 2.23 November 2019
system can still be damaged from close coupling to a transmitting antenna. The limiting diodes begin to operate at
1.1Volts RMS or +12dBm and reach a fully limited output of 3.0Volts peak to peak at +20dBm. If you are close to a
broadcast transmitter that drives the protection diodes into conduction, you may experience intermodulation
distortion to the desired signals you are trying to receive. Try re-orienting the BevFlex-4X to reduce the nearby,
strong, interfering signal, or contact Unified Microsystems Antennas for other suggestions.
The antenna switching and termination unit is also protected against accidental application of RF power from the
transmitter by a small fuse, which can be seen if you open the unit (See Figure-10). Should you accidently blow this
fuse, the unit will be non-operational. If this occurs, you can replace this fuse with an identical 50 ma fuse available
from Unified Microsystems (Bell P/N MRF 50, available from DigiKey and Mouser ) or insert a small jumper wire or 10
ohm resistor across the pads G2. If you bridge the blown fuse with a resistor or jumper, the future protection of the
BevFlex-4X system will be compromised.
The inputs from the antenna feed lines have Ohmic isolation from the feedline to the receiver input. If you have a
reason to provide a DC connection between the feedline shields and the shield of the coaxial cable to the receiver
input, you can make the connection with a jumper wire in the G1 pads inside the Switch Unit. It is recommended
that you leave this jumper out (factory default) because it provides better isolation to your receiver and also reduces
common mode noise that might be picked up on the feed lines from the Feed Unit.
Figure-8 Indoor Antenna Direction Switch Unit Front Panel
