Lectrosonics VRT2 Modular Receiver System
Up to six VRT2 modules may be installed per each 1RU Venue 2 receiver frame. Each module supports up to 3072 tunable frequencies across a 75 MHz range (three standard Lectrosonics blocks), matching the tuning ranges of SSM, LT and LMb "large bandwidth" transmitters. VRT2 modules incorporate Lectrosonics’ new IQ dynamic tracking filters, which accommodate a wide range of transmitter RF power levels while also enabling extremely tight channel spacing—critical features as the available RF spectrum continues to shrink.
The receiver modules can be operated independently, each with switched diversity reception for a total of six audio channels, or operated in pairs for more robust diversity reception with one audio channel per module pair. Combinations can be mixed and matched within one frame. Receiver modules are easy to change, with no tools required, and may be installed in any position, except when paired for ratio diversity reception. The VRT2 modules are offered in four different frequency ranges for worldwide use: A1, covering blocks 470, 19 and 20 (470.100 - 537.575 MHz), B1, covering blocks 21, 22 and 23, (537.600 - 614.375 MHz), C1, covering blocks 24, 25 and 26 (614.400 - 691.175 MHz) and D1, for export only, covering blocks 27, 28 and 29 (691.200 - 767.975 MHz).
VRT2 modules are not compatible with older Venue (VRM, VRMWB, VRMWBL) frames.
iQ Front-end Filtering
Each VRT2 receiver module features a tracking front-end filter that travels across the spectrum to stay centered on the selected operating frequency. Under certain conditions, the filter parameters change automatically to minimize IM (intermodulation).
When the incoming RF signal is strong, the iQ filter switches to a narrowband mode with reduced gain for additional suppression of signals above and below the operating frequency. This mode is especially useful in applications such as a live stage production where transmitters are generally close to the receiver antennas. In these conditions, IM is prevalent, but the signals that generate it are significantly reduced by the narrowband filter mode.
When the incoming RF signal level weakens, the filter switches to an extended range mode for maximum sensitivity in the receiver module. The filter tracks in fine incremental steps so that it is accurately centered on the operating frequency.