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Sony Wireless Microphone Common Features
PLL Synthesized System
Phase Locked Loop (PLL) frequency synthesized systems
are employed both in transmitters and receivers, assuring
carrier stability and providing easy access to multiple
frequencies. These PLL controlled systems provide highly
stable, selectable frequencies to be generated in
increments of 125 kHz. Users may choose from 188
frequencies on USA type models, and 102 frequencies on
AU models.
Space Diversity Reception System
A space diversity reception system is used to eliminate
signal dropout. Dual antenna inputs and reception circuits
incorporated in the diversity system receive signals over
two different paths and select the stronger signal as the
output. This switching operation is undetectable on the
audio output of the receivers.
Pre-programmed Frequency Groups
Optimum combinations of calculated and practically
tested intermodulation-free frequencies are stored in each
receiver to make it easy to choose the correct frequencies
for simultaneous multi-channel operation. These
frequencies are arranged in groups, with each group pre-
programmed to allow virtually interference free operation.
Advanced Filtering
The Sony wireless units all employ Helical, Ceramic and/or
SAW (Surface Acoustic Wave) filters as appropriate. This
offers stable reception and superb audio quality, and also
enables the unique miniaturization seen in most of the
Sony products.
Tone Squelch Circuitry
The wireless microphone transmitters also transmit a 32.768
kHz pilot-tone signal along with the audio signal. In the
receivers, a squelch circuit is present, and the audio signal
is only output when the tone signal has been correctly
received.
This squelch function is designed to virtually prevent the
output of unwanted signals or noise from other signal
transmissions in the air, as well as the RF noise and popping
noise that occur when the transmitter is power on or off.
Compander System for Wide Dynamic Range
and Low Noise
A compander (compressor/expander) system is included
for improved audio dynamic range and low noise and
interference. The time constants for attack and release
times are carefully chosen in the various transmitters to
match the application, ensuring minimized noise level
while providing smooth and superb audio quality.
Multiple Information on Easy-to-read LCD and
LED
Most receivers and transmitters feature easy-to-read LCD
panel and LED indicators, which provide extensive
information on the operating conditions.
Most receivers will display the RF-input level, audio-output
status, current channel number and frequency, and
battery status of the transmitter.
Most transmitters do in essence have the same information
available in the receivers such as audio-input and RF-
output status, current channel number and frequency,
input attenuation setting, and accumulated battery
operating time.
Remote Battery Alarm on Receiver
For added assurance of continued operation, users can
monitor the battery reserves of handheld, body pack and
plug-on transmitters. Remaining battery life is indicated on
both the transmitter and receiver, with additional
indication approximate one hour* before the battery goes
dead. On the receiver, the battery indicator on the LCD
and LED displays also flash, helping to avoid the chance of
battery failure at a critical moment.
*This may vary depending on the operational environment.
Consistent RF Power Output
A DC-DC convert circuit built into the power supply section
of microphones/transmitters assures consistent output
power over the life of the batteries.
Channel Setting Back Up
Each unit has a convenient memory back up for storing
operating frequencies. When the power switch is turned
on, the previous channel setting is automatically recalled
and displayed.
AF
BATT
RF
GP
CH
GP
CH
BATT
