Lectrosonics T2 User Manual download pdf (Page 4)

GENERAL TECHNICAL DESCRIPTION

The IFB T2 transmitters are comprised of a number of functional sub-systems as shown in the block diagram below.

GENERAL

The system uses 20kHz wide deviation for high signal to noise ratio. The transmitter circuits are all regulated to allow

full output power from the beginning (9 Volts) to the end (6.5 Volts) of battery life. The input amplifier uses a Motorola

33078 op amp for ultra low noise operation. It is gain controlled with a wide range input compressor which cleanly

limits input signal peaks over 30dB above full modulation.

COMPANDOR NOISE REDUCTION

The single band compandor is a high quality audio device that processes the input signal such that the large dynamic

ranges of input signal can be transmitted to the receiver without overload or noise. A complementary system in the

receiver recovers the original dynamics of the signal for full audio quality. Compression and expansion ratios are

complementary at 2:1. High frequency pre-emphasis is implemented in the transmitter to provide another 10dB signal

to noise improvement. Matching de-emphasis is provided in all receivers.

TRANSMITTER

Vref

SET

LED

LIMIT

LED

COMPANDOR

Vreg

+5VDC

+3.6VDC

SHUNT

LIMITER

INPUT

AMP

AUDIO

LEVEL

FILTER

PEAK AUDIO

INDICATOR &

LIMITER

DRIVER

PILOT

TONE

OSC

MIC

JACK

+5V BIAS

SUPPLY

ROLL-OFF

COMPANDED AUDIO

TO XMTR

COMPANDED

AUDIO

PHASE LOCKED LOOP

VOLTAGE

CONTROLLED

OSCILLATOR

FREQ

SWITCHES

DIVIDER

LOW PASS

FILTER

PRESCALER

BUFFER

+9VDC

PWR

LED

+9VDC

PWR

IFB T2 Block Diagram

1 2 3 4 5 6 7 8 9 ... 17 18

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Lectrosonics T2 User Manual Page 4

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