Lectrosonics R400a Digital Hybrid Wireless Diversity Receiver

The Lectrosonics R400a Digital Hybrid Wireless Diversity Receiver is a state-of-the-art solution for professionals seeking reliability and performance in wireless audio transmission. Engineered with cutting-edge technology, this receiver excels in environments where audio fidelity is paramount, delivering crystal-clear sound with minimal interference. Its hybrid design merges the best of digital and analog audio processing, ensuring a robust signal even in challenging conditions.

This high-performance, triple-conversion, frequency synthesized UHF receiver is fully compatible with all Lectrosonics 400 series transmitters, as well as a number of analog models. The proprietary audio processing includes a DSP (digital signal processor) for very low distortion and a superior signal-to-noise ratio. This DSP eliminates a compandor and its artifacts, providing exceptional audio quality when operating in its native hybrid mode. Special DSP algorithms also ensure compatibility with Lectrosonics 100 and 200 Series analog transmitters.

With a rugged chassis and intuitive interface, the R400a is built for the rigors of live performance, film production, and broadcast applications. It features advanced diversity reception, known as SmartDiversity™, which enhances signal stability by utilizing two antennas to capture the best signal. This ensures that your audio remains consistent and high-quality, regardless of the distance or obstacles between the transmitter and receiver.

The R400a is equipped with SmartTune™ for auto frequency selection and offers 256 selectable UHF frequencies, ensuring versatility for various audio applications. The unit's easy-to-read graphics type backlit LCD display provides real-time information on battery status, signal strength, audio levels, and operating frequency, making it simple for users to monitor their setup on the fly. Additionally, a built-in RF spectrum analyzer allows for site surveys to find interference-free operating frequencies, recording RF activity across the tuning range for quick identification of optimal channels.

Key Features

• Digital Hybrid Wireless® technology (U.S. Patent #7,225,135) for superior sound quality
• SmartSquelch™ and SmartDiversity™ for enhanced reception and noise management
• 256 selectable UHF frequencies for flexible audio solutions
• Low noise, robust RF front end with RF-controlled digital noise filters
• Rugged and durable chassis designed for professional use
• Real-time monitoring with a graphics type backlit LCD display

Technical Specifications

Frequency Range
470 to 608 MHz

Operating Frequencies (MHz)
Block 470: 470.100 - 495.600
Block 19: 486.400 - 511.900
Block 20: 512.000 - 537.500
Block 21: 537.600 - 563.100
Block 22: 563.200 - 588.700
Block 23: 588.800 - 607.900
614.100 - 614.300

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

Sensitivity
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

Audio Outputs Rear Panel
Independent balanced 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: Displays pilot tone indicator, diversity antenna activity, RF and audio levels, operating frequency, transmitter frequency switch settings, and transmitter battery status.

Audio Output Level Adjustment
-50 dBu to +5 dBu, XLR and 1/4 inch connectors independently adjustable

Battery Level Tracking
Receiver and transmitter (9 V battery) in 1/10th volt steps, accuracy +/- 0.2 V. Transmitter (AA battery), accuracy +/- 0.05 V. Timer option available.

Scanning Mode
Coarse and fine modes for RF spectrum site scanning

Audio Test Tone
1 kHz, -50 dBu to +5 dBu output, < 1% THD

Transmitter Battery Type Selection
9 V alkaline, 9 V lithium, AA alkaline, AA lithium

TIMER
Phase invert: Audio output phase normal or inverted

Smart NR (Noise Reduction)
OFF, NORMAL, FULL modes (available in 400 Series mode only)

Audio Performance
(These specs apply to 400 Series mode only.) Frequency Response: 30 Hz to 20 kHz (+/- 1 dB) (Overall system frequency response will vary depending on transmitter used)
THD: 0.2% (typical)
SNR at Receiver Output (dB): Input Dynamic Range: 125 dB (with full Tx limiting)

Rear Panel Controls and Features
XLR and 1/4-inch phone audio output jack; External DC input; BNC antenna connectors.

Power, Ext DC
Minimum 8 volts to maximum 18 volts DC; 1.6 W, 200 mA maximum.

Weight
13 oz.

Dimensions
5.50” (14 cm) wide, 1.75” (4.5 cm) high, 6.25” (16 cm) deep

What's Included

• 1 – Power Supply (Part #DCR12/A4U)
• 2 – Antennas (Part #A500RAXX)
• 4 – Rubber Feet (Part #35664)
• 1 – Quickstart Guide