The front panel features a menu-driven LCD interface and four membrane switches which are used to view and alter settings. The main LCD window displays the pilot tone indicator, diversity activity, RF level, audio level and transmitter battery status for both receivers. To nd clear operating frequencies, a built-in spectrum analyzer scans across the tuning range of the receiver and dis- plays a histogram of RF activity across the band. Areas with little or no RF activity are easily recognizable.
The two internal receivers can be operated separately, each using switching, antenna combining diversity, or in tandem with ratio diversity reception. The audio outputs of the receivers can be mixed internally, or left separated for discrete recording tracks or external mixing.
A variety of output adapters and mounting options are available for camera slot operation. The receivers are powered from an external 7 to 18 volt DC source. The SRC5P model provides a 5-pin connector next to the control panel with audio output from both channels in addition to the camera slot outputs.
Digital Hybrid Wireless is a revolutionary design that combines digital audio with an analog FM radio link to provide both outstanding audio quality and exemplary, noise-free RF performance. Using a patented algorithm to encode 24-bit digital audio information in the transmitter into an analog format, the encoded signal is then transmitted over an analog FM wireless link. At the receiver, the signal is then decoded to restore the original digital audio. This process eliminates compandor artifacts and produces an audio frequency response at to 20 kHz.
Three Block Tuning Range The SRC & SRC5P receivers tune across a range of over 76 MHz. This tuning range covers three standard Lectrosonics frequency blocks.
RF Front-End with Tracking Filter A wide tuning range is helpful in nding clear frequen- cies for operation, however, it also allows a greater range of interfering frequencies to enter the receiver. The UHF frequency band, where almost all wireless microphone systems operate, is heavily populated by high power TV transmissions. The TV signals are immensely more pow- erful than a wireless microphone transmitter signal and will enter the receiver even when they are on signi cantly different frequencies than the wireless system. This pow- erful energy appears as noise to the receiver, and has the same effect as the noise that occurs with extreme operating range of the wireless system (noise bursts and dropouts). To alleviate this interference, front-end lters are needed in the receiver to suppress RF energy below and above the operating frequency. Each receiver employs a variable frequency, tracking lter in the front-end section (the rst circuit stage follow- ing the antenna). As the operating frequency is changed, the lters re-tune to stay centered over the selected car- rier frequency. In the front-end circuitry, a tuned tracking filter is followed by an amplifier and then another tuned tracking filter to provide the selectivity needed to suppress interference, yet provide a wide tuning range and retain the sensitivity needed for extended operating range.
IF (Intermediate Frequency) Filters Following the front-end, the incoming RF signal in each receiver is mixed down to a lower frequency for addition- al ltering with two SAW (surface acoustic wave) lters. The use of two lters signi cantly increases the depth of filtering while preserving sharp skirts, constant group delay, and wide bandwidth.
Digital Pulse Counting Detector Following the IF section, the receiver uses an elegantly simple, yet highly effective digital pulse counting detec- tor to demodulate the FM signal to generate the audio, rather than a conventional quadrature detector. This unusual design eliminates thermal drift, improves AM rejection, and provides very low audio distortion.
SmartSquelchTM A DSP-based algorithm named SmartSquelchTM optimizes the receiver performance in very weak signal conditions. The RF level and supersonic noise in the audio are con- tinuously monitored to determine the appropriate noise reduction needed and the point at which squelch (complete muting of the audio) is necessary.
SmartTuneTM Frequency Selection SmartTuneTM simplifies setup by scanning the tuning range of the receiver or a selected frequency block, and auto- matically setting a channel to the best available frequency. A prompt appears, reminding the user to use IR sync or manual settings to tune the transmitter to the selected frequency, then turn it on so the receiver sees it. Then, a prompt asks if the process should continue for the second channel. This process allows very quick and accurate tun- ing, whatever the RF environment.
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