Lectrosonics UCR195D User Manual download pdf (Page 4)

INTRODUCTION TO THE 195 SYSTEM

The 195 Series system was designed for the most critical

studio and sound reinforcement applications. The

system design represents a significant step forward in

wireless microphone technology. Every stage in the

entire audio/radio chain from transmitter input to re-

ceiver output was evaluated and analyzed to produce the

operating parameters and performance requirements for

this entirely new design. The audio system provides the

lowest distortion and best signal to noise ratio of any

wireless mic system ever built. The RF link is extremely

stable, providing the highest reliability and freedom from

drop outs and interference.

The UCR195D employs the most advanced circuit and

mechanical design ever applied to a wireless microphone

receiver. The audio processing is the finest quality

system ever developed for wireless microphone systems.

The UCR195D re-defines the state of the art in high end

wireless microphone receivers.

The entire radio/audio system was designed from a “cold

start,” utilizing all that has been learned thus far. Many

new types of IC’s and semi-conductors are available now

that were only ideas a few years ago. The UCR195D

design takes advantage of these new devices.

UT195 TRANSMITTER

The UT195 hand-held transmitter design was the result

of considerable research. The RF and audio performance

of the transmitter was considered first, followed by an

analysis of the typical user’s needs and the practicality of

various design possibilities. The basic circuitry had to

accommodate any frequency in the VHF or UHF spec-

trums. The mechanical design had to provide a comfort-

able “feel,” yet be rugged, foolproof and easy to operate.

The operating features and functions faced several

contradictions in the needs of different types of users.

This led to the development of a very versatile design

wherein the transmitter can be configured for either “fool

proof” operation or to provide user control of the audio

level, metering and indicators. The final UT195 design

combines the benefits of superior performance, rugged-

ness, user convenience, and flexibility.

UM195 TRANSMITTER

The UM195 is a small belt-pack style transmitter which

can be clipped on the belt, slipped into a pocket, or even

taped to the user's body under clothing. It offers the

same high performance and wide deviation as the UT195

and is compatible with all of Lectrosonics' 195 series

receivers. The UM195 comes with a standard lavalier

microphone but practically any mic can be adapted to

work with this transmitter. The transmitter audio level

can easily be monitored and set from the front panel.

DUAL-BAND COMPANDOR

Compandors have long been a source of audible distor-

tion in wireless microphone systems. The basic problem

is that when the full bandwidth of the audio signal is

processed by a single compandor, the attack and decay

times will always be a compromise. If the time con-

stants are fast, high frequency transient distortion will be

low, but low frequencies will be distorted. If the time

constants are slowed down, low frequency distortion will

be low, but high frequency transients will then be

distorted. The 195 system introduces a new approach to

solving this basic problem with compandors, called

“dual-band companding.”

There are actually two separate compandors in the 195

system, one for high frequencies and one for low fre-

quencies. A crossover network ahead of the compandor

separates the frequency bands at 1kHz with a 6dB per

octave slope, followed by separate high and low fre-

quency compandors. The attack and release times in the

high frequency compandor are fast enough to keep high

frequency distortion at an extremely low level. The low

frequency compandor uses slower time constants,

reducing low frequency distortion to well below that of a

conventional compandor.

75kHz DEVIATION

Wideband, 75kHz, of deviation improves the capture

ratio, signal to noise ratio, and AM rejection of a wire-

less system dramatically.

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Lectrosonics UCR195D User Manual Page 4

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