Table Of Contents; Introduction; Frequency Agility; Encryption - Lectrosonics DBu Instruction Manual

DBu

Table of Contents

Introduction ........................................................................... 2
Frequency Agility................................................................. 2
Encryption ........................................................................... 2
Servo Bias Input and Wiring ............................................... 3
DSP-controlled Input Limiter ............................................... 3
DBu Block Diagram ............................................................. 3
Battery Installation ............................................................... 4
Battery Status LED Indicator .............................................. 4
Belt Clips ............................................................................. 5
IR (infrared) Port ................................................................. 5
Features and Functions ....................................................... 5
Operating Instructions ......................................................... 6
Powering On in Operating Mode ......................................... 6
Powering On in Standby Mode ........................................... 6
Powering Off ....................................................................... 6
Power Menu Options ............................................................ 6
Entering the Power Menu .................................................... 6
LCD Menu Map ...................................................................... 7
Main Menu and Setup Screen Details ................................. 8
Entering the Main Menu ...................................................... 8
Main Window Indicators ..................................................... 8
Connecting the Signal Source ............................................ 8
Adjusting the Input Gain ...................................................... 8
Selecting Frequency ........................................................... 9
Selecting Programmable Switch Functions......................... 9
Selecting the Low Frequency Roll-off ................................. 9
Selecting Audio Polarity (Phase) ......................................... 9
Selecting Battery Type ........................................................ 9
Setting Transmitter Output Power ....................................... 9
Remote ............................................................................... 9
Locking/Unlocking Changes to Settings.............................. 10
Restoring Default Settings .................................................. 10
KeyType .............................................................................. 10
WipeKey .............................................................................. 10
SendKey .............................................................................. 10
LectroRM ............................................................................... 11
Whip Antennas .................................................................... 12
Encryption Key and Settings Transfer ............................... 12
Accessories .......................................................................... 13
5-Pin Input Jack Wiring ........................................................ 14
Microphone Cable Termination
for Non-Lectrosonics Microphones ............................. 15
Input Jack Wiring for Different Sources ............................. 16
Microphone RF Bypassing .................................................. 17
Line Level Signals ............................................................... 17
Wireless Designer Software ............................................... 18
Firmware Update Instructions ............................................. 18
Specifications ....................................................................... 19
Troubleshooting .................................................................... 20
Service and Repair ............................................................... 21
Returning Units for Repair .................................................. 21
2

Introduction

The DBu transmitter employs high efficiency digital cir-
cuitry for extended operating time on two AA batteries.
The transmitter can tune in coarse or fine steps across
the UHF television band from 470.100 to 607.950 MHz,
with a selectable output power of 25 or 50 mW. The
pure digital architecture enables AES 256-CTR encryp-
tion for high level security applications.
Studio quality audio performance is assured by high
quality components in the preamp, wide range input
gain adjustment and DSP-controlled limiting. Input
connections and settings are included for any lavaliere
microphone, dynamic microphones and line level inputs.
Input gain is adjustable over a 44 dB range in 1 dB
steps to allow an exact match to the input signal level,
to maximize the dynamic range and signal to noise
ratio.

Frequency Agility

The transmitter tunes across the entire frequency
range, from 470.100 MHz to 607.950 MHz.

Encryption

When transmitting audio, there are situations where pri-
vacy is essential, such as during professional sporting
events, in court rooms or private meetings. For instanc-
es where your audio transmission needs to be kept
secure, without sacrificing audio quality, Lectrosonics
introduces Encryption Keys. Truly entropic encryption
keys are first created by a Lectrosonics receiver, such
as the DSQD Receiver. The key is then synced with the
DBu via the IR port. The audio will be encrypted and
can only be listened to if both DBu and receiver have
the matching encryption key. If you are trying to transmit
an audio signal and keys do not match, all that will be
heard is silence or white noise.
LECTROSONICS, INC.