The R400a is a high performance, triple-conversion, frequency synthesized, UHF receiver fully compatible with all Lectrosonics 400 series transmitters, and various of analog models
The proprietary audio processing includes a DSP (digital signal processor) for very low distortion and a superior signal to noise ratio. The DSP eliminates a compandor and its artifacts to provide exceptional audio quality when operating in its native hybrid mode. Special DSP algorithms also provide compatibility modes for use with Lectrosonics 100 and 200 Series analog transmitters.
The R400a features a powerful menu-driven LCD graphic display operated with a push-button switch and a dual function rotary encoder control as a convenient means of viewing and altering settings. The LCD main window displays the pilot tone indicator, diversity antenna activity, RF and audio levels, operating frequency, transmitter frequency switch settings and transmitter battery status. Settings can be changed using the MENU functions. A built-in RF spectrum analyzer is included to conduct site surveys to find interference-free operating frequencies. The analyzer quickly tunes the receiver across its 256 frequencies and records a marker on the LCD indicating the strength of any RF signals picked up. Within less than a minute, a complete display is generated showing the RF activity across the entire tuning range of the receiver. An area with little or no RF activity is then easy to locate and select.
Digital Hybrid Wireless® (U.S. Patent #7,225,135)
SmartTune for auto frequency selection
256 selectable UHF frequencies
RF-controlled digital noise filters
Low noise, Robust RF Front End
DSP-based pilot tone
Graphics type backlit LCD display
Independent balanced XLR and unbalanced 1/4-inch audio outputs
Compatiblity modes for use with analog transmitters
Operating Frequencies (MHz)
Block 470: 470.100 - 495.600
Block 19: 486.400 - 511.900, 614.100 - 614.300
Block 20: 512.000 - 537.500
Block 21: 537.600 - 563.100
Block 22: 563.200 - 588.700
Block 23: 588.800 - 607.900
Block 24: 614.400 - 639.900
Block 25: 640.000 - 665.500
Block 26: 665.600 - 691.100
Frequency Adjustment Range: 25.5 MHz in 100 kHz steps Channel Separation: 100 kHz Receiver Type: Triple conversion, superheterodyne, 244 MHz, 10.7 MHz and 300 kHz Frequency Stability: ±0.001 % Front end bandwidth: ±30 MHz @ -3 dB
20 dB Sinad: 1 uV (-107 dBm), A weighted
60 dB Quieting: 1.5 uV (-104 dBm), A weighted
Squelch quieting: Greater than 100 dB AM rejection: Greater than 60 dB, 2 uV to 1 Volt (Undetectable after processing) Modulation acceptance: 85 kHz Image and spurious rejection: 85 dB Third order intercept: 0 dBm Diversity method: Phased antenna combining - SmartDiversity FM Detector: Digital Pulse Counting Detector operating at 300 kHz Antenna inputs: Dual BNC female, 50 Ohm impedance
Rear Panel XLR adjustable from -50 dBu to +5 dBu in 1 dB steps. Calibrated into a typical 10 k Ohm balanced load. Can drive 600 Ohm load.
Rear Panel 1/4 inch jack adjustable from -55 dBu to +0 dBu in 1 dB steps.
Front Panel Controls and Indicators
Rotary Control Knob: Combined push/rotate switch combination for menu selection and system configuration.
Pushbutton: Press and hold several seconds for POWER OFF. Momentary press (if unit is powered up) for return to previous window
LCD Main window: Pilot tone; antenna phase, transmitter battery status; audio level, RF level; Battery timer; Frequency; and Transmitter switch setting
Audio output level adjustment: -50 dBu to +5 dBu, XLR and 1/4 inch connectors independently adjustable