The UCR411A receiver provides professional performance and a versatile feature set in a compact design for field and location production. All settings are made from the front panel with a powerful LCD interface, making the unit ideal for use in Quad Paks, on sound carts, in portable bags and in rack mount multi-couplers. To alleviate interference problems in an increasingly congested RF spectrum, an RF spectrum analyzer is built into the receiver. The receiver tunes across its 25.6 MHz tuning range and records RF activity with markers on the LCD screen. Finding clear operating frequencies is a quick, simple process. The UCR411A is compatible with all 400 Series Lectrosonics wireless transmitters (and some other transmitter types) and can be powered with internal 9V batteries or external DC.
The mechanical design of the receiver combines field proven features developed over many years of experience in motion picture and television production markets. The machined aluminum housing and panels are surfaced with electrostatic powder coated and anodized finishes with laser etched markings to withstand the rigors of field production.
DSP Compatibility Modes The native, compandor-free Digital Hybrid operating mode works with all Lectrosonics hybrid transmitters. DSP “compatibility modes” allow the receiver to also work with companded analog transmitters from Lectrosonics and some from other manufacturers. This expands the usefulness of the receiver and provides the backward compatibility needed to give existing customers an economical upgrade path.
Frequency Tracking Front-End Filters The front-end consists of four transmission line resonators with variable capacitance applied to each resonator to retune it as the frequency is changed. The tuning range covers a full 25.6 MHz block of frequencies. The design provides tunable, narrow ltering as selective as most fixed frequency designs, with the overload performance of the best front-ends available. The result is extended operating range in even the most congested RF environments.
A conventional squelch design faces several compromises.
Squelch too aggressively and audio may be lost.
Squelch too little and excessive noise may be heard.
Respond too rapidly and the audio will sound “choppy.”
Respond too sluggishly and entire words or syllables can be cut off.
SmartSquelchTM achieves an optimal balance of these trade- offs by combining several techniques that remove distracting noise without the squelching action itself becoming a distrac- tion. The circuitry will perform the following functions:
Wait for a complete word or syllable before squelching.
Assess recent squelching history and RF signal strength.
Assess audio content to determine available masking.
By adjusting squelching behavior dynamically for the optimal result under varying conditions, the receiver can deliver ac- ceptable audio quality from otherwise unusable signals.
SmartDiversityTM Microprocessor controlled antenna phase combining is utilized for diversity reception to keep the receiver small, yet still deal effectively with multi-path dropouts. The embedded rmware analyzes RF level, the rate of change of RF level and the audio content to determine the optimum timing for phase switching, and the optimum antenna phase. This adaptive technique operates over a wide range of RF levels to anticipate dropouts before they occur. The system also employs “opportunistic switching” to analyze and then latch the phase in the best position during brief squelch activity.
SmartNRTM With a noise floor at -120 dBV and a frequency response to 20 kHz, high frequency noise in the source audio is more apparent than in conventional wireless systems. The Smart Noise Reduction algorithm works by attenuating only those portions of the audio signal that a statistical profile for randomness or “electronic hiss.” Because it isn’t simply a sophisticated variable low pass filter as in earlier analog designs, much greater transparency is obtained. Desired high frequency signals having some coherence such as speech sibilance and tones are not affected. The Smart NR algorithm has three modes, selectable from the front panel LCD. When switched OFF, no noise reduction is performed. When switched to NORMAL, the factory default setting, enough noise reduction is ap- plied to remove most of the hiss from the mic preamp and some of the hiss from lavaliere microphones. When switched to FULL, enough noise reduction is applied to remove most of the hiss from nearly any signal source of reasonable quality, assuming levels are set correctly at the transmitter.
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