Good day everybody,
For an off-air repeater, we normal use bi-direction amplifier (BDA). A BDA is
constructed using two amplifiers for uplink and downlink, interconnected with
two duplexers (or circulators) at the front end. In order to prevent the BDA
from looping oscillation, the duplexer (circulators) must provide sufficient
isolation.
We have built such BDA; however, we face the oscillation problem. We are
thinking of breaking the BDA into two parts: uplink and downlink. And we
amplify uplink and downlink separately. In this way, we need four duplexers (or
circulators). Would this method work? Anybody could advise?
Best Regards,
Kent Chong
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