The higher selectivity VRT module has a much narrower tracking front-end filters that retune as the frequency is changed to stay centered over the selected frequency.
The modules are a triple conversion, frequency synthesized design, controlled by the microprocessor in the host assembly. A common DSP in the host
assembly is used for all six receiver modules to decode the received signals and restore the digital audio. Using a single DSP results in a significant reduction in cost per channel.
The host assembly will handle up to six receiver modules via multi-pin connectors on the side of the main housing. The modules are held in place with snap-in retaining clips. The clips hold the modules firmly but are easy to remove without tools to make needed changes.