User Manual
Table Of Contents
SECTION 1: THEORY OF OPERATION
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Diversity Reception Controller
Principle of Operation
The DRC is the central processor of a patented triple-receiver DRC.
The DRC accepts inputs from three (3) receivers, determines which receiver has the best SNR (signal-to-
noise ratio), and selects that receiver to supply recovered modulation.
High-speed RSSI from the three (3) receivers are processed by the RSSI input and RSSI level- shifter
sections, and are then forwarded to the receiver selector. The receiver selector selects the appropriate
receiver.
Audio from each receiver is processed by the audio input section and is sent to the audio switch. The
audio switch performs the actual selection process as directed by the receiver selector.
Receive Baseband Processing
Functional diagram of the receive baseband processing section.
DIVAUDIO (diversity audio) from the DRC is routed to two (2) separate paths, depending on whether the
audio is destined for an external device (control head, eternal modem, etc.) or for the internal 4-level FSK
modems.