User's Manual

RHBDA OVERVIEW:
The RHBDA assembly enhances the coverage area of radio communications in
buildings and RF shielded environments. The unit features low noise figure and wide
dynamic range. It is based on a duplexed path configuration with sharp out of band
attenuation allowing improved isolation between the receiving and transmitting paths.
RHBDA BLOCK DIAGRAM DESCRIPTION
:
Refer to Figure 1 for the following discussion.
The RHBDA Downlink path receives RF signals from a Source, amplifies the RF
signal, and transmits the signal to the subscriber. The RHBDA Uplink path receives
RF signals from the subscriber then amplifies the RF Signal, and sends it to the
Base. The Uplink and Downlink occupy two distinct frequency bands. The frequency
bands are as follows: 806-824 MHz for the Uplink and 851-869 MHz for the Downlink.
Two Filters and one diplexer isolate the Uplink and Downlink paths.
A selectable Automatic Level Control (ALC) allows for output power limiting. A
variable step attenuator gives 0 – 30 dB of attenuation in 2 dB steps on the Rack
Uplink and Rack Downlink paths. The use of these controls is covered in the
“OPERATION” section, later in this document.
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