Lectrosonics HH/E01 Instruction Manual
Rio Rancho, NM, USA
www.lectrosonics.com
HH/E01
Handheld Transmitter
Digital Hybrid Wireless® Technology
US Patent 7.225.135
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INSTRUCTION MANUAL
HH/E01
LECTROSONICS, INC.
2
Hand Held Transmitter
Rio Rancho, NM
3
Table of Contents
General Technical Description ............................................. 4
Capsule and Battery Installation .......................................... 6
Control Panel .........................................................................7
Powering On ...........................................................................7
Powering Off ..........................................................................7
Standby Mode ........................................................................ 7
Battery Condition .................................................................. 8
Navigating Menus and Screens ........................................... 8
About Setting Audio Gain ................................................... 10
Mute and Talkback Functions ............................................. 10
Troubleshooting ................................................................... 12
Specifications ...................................................................... 13
Service and Repair .............................................................. 14
Returning Units for Repair ................................................. 14
HH/E01
LECTROSONICS, INC.
4
General Technical Description
Introduction
The HH/E01 handheld transmitter uses state-ofthe-art Digital Hybrid Wireless® wireless technology,
selectable output power and a versatile microphone
capsule mounting system to meet the needs of audio
professionals and vocalists.
The compandor-free Digital Hybrid audio chain
preserves the quality of the selected microphone
capsule and delivers it to the sound and recording
system without coloration. This superb audio performance and highly reliable RF transmission makes it
ideally suited for high end stage and studio production.
Digital Signal Processor
The DSP encodes the digitized audio from the A-D
converter and adds an ultrasonic pilot tone to control
the receiver’s squelch in systems that use pilot tone.
It also controls the input limiter and audio metering.
Compatibility Modes
The transmitter was designed to operate with Lectrosonics Digital Hybrid Wireless® receivers and will
yield the best performance when doing so. Due to
the flexibility of digital signal processing, however,
the transmitter is also able to operate with Lectrosonics IFB receivers in special compatibility modes.
Digital Hybrid Technology
All wireless links suffer from channel noise to some
degree and all wireless microphone systems seek
to minimize the impact of that noise on the desired
signal. Conventional analog systems use compandors to increase the signal to noise ratio, at the cost
of distortion artifacts. Wholly digital systems defeat
the noise by sending the audio information in digital form, at the cost of some combination of power,
bandwidth or channel count.
The Lectrosonics Digital Hybrid Wireless® system (also called simply Digital Hybrid) overcomes
channel noise by digitally encoding the audio in the
transmitter and decoding it in the receiver, yet still
sending the encoded information via an analog FM
wireless link.
This proprietary algorithm is not a digital implementation of an analog compandor. Instead, it is
a technique that can be accomplished only in the
digital domain, even though the inputs and outputs
are analog signals.
Because it uses an analog FM link, the Digital Hybrid
enjoys all the benefits of conventional FM wireless
systems, such as excellent range, efficient use of
RF spectrum, and long battery life. However, unlike
conventional FM systems, the Digital Hybrid has
eliminated the analog compandor and its artifacts.
No Pre-Emphasis/De-Emphasis
The Digital Hybrid design results in a signal-to-noise
ratio high enough to preclude the need for conventional
pre-emphasis (HF boost) in the transmitter and deemphasis (HF roll off) in the receiver. This eliminates
the potential for distortion of signals with abundant
high-frequency information.
Mic
capsule
Bias 5V
+7V
Input
Amp
Interface
Shunt
Limiter
MENU/SEL
BACK
MUTE
POWER
Reference
Crystal
Reference
Crystal
3 V
Battery
Variable
Switching
Power
Supply
Hi.Lo
Pass
Filter
Digital
Pot
Audio
Level
Phantom
Power
Audio
A-D
Converter
11001001
D-A
Converter
11001001
Control Panel
Microprocessor
Voltage
Controlled
Oscillator
Final
Amplifier
50
Ohms
Isolator
Filter
Amp
Encoded Audio
and Pilot Tone
Bicolor
Modulation
LEDs
Switching
Power
Supply
Digital Signal Processor
Phase Locked Loop
LCD
Hand Held Transmitter
Rio Rancho, NM
5
Pilot Tone Squelch
The benefit of the pilot tone squelch system is that
the associated receiver will remain muted until it
receives the pilot tone from the matching transmitter, even if a strong RF signal is present on the
carrier frequency of the system. All Digital Hybrid
transmitters use one of 256 different ultrasonic tones
between 25 and 32 kHz to operate the receiver
squelch. The pilot tone frequency is chosen according to which of the 256 channels has been selected
by the frequency switch setting. This ensures that all
transmitters on each frequency block in a multi-channel system have different pilot tone frequencies so
that even spurious RF from the wrong transmitters
will not open the receiver squelch.
Input Gain Range and Limiter
45 dB range of input gain adjustment allows gain
settings to accurately match the user’s voice level.
A DSP-controlled analog audio limiter is employed
before the A-D converter. The limiter has a range of
more than 30 dB for excellent overload protection. A
dual release envelope makes the limiter acoustically
transparent while maintaining low distortion. It can be
thought of as two limiters in series, a fast attack and
release limiter followed by a slow attack and release
limiter. The limiter recovers quickly from brief transients, with no audible side effects, and also recovers slowly from sustained high levels to keep audio
distortion low while preserving short term dynamics.
Long Battery Life
Switching power supplies throughout the design
extend battery life by allowing the unit to continue
to operate and remain stable with full power output
down to low battery voltages.
Menu-Driven Control
A high-resolution LCD and control panel with membrane switches provide access to the menu-driven
setup. The backlit LCD is placed on the outer housing and the control panel is concealed by the outer
housing cover. The control panel is accessed by
opening the lower housing cover, which also accesses the battery compartment.
Frequency Selection
Operating frequency is normally selected using a
receiver or analyzer to assess signals in the local
environment to avoid interference. Once an interference-free frequency is identified, the transmitter
frequency is set to match the receiver.
The LCD on the transmitter displays frequency in
MHz and with a two character hex code that is used
on most Lectrosonics receivers.
Membrane switches on the control panel select 256
frequencies in 100 kHz steps or 1024 frequencies in
25 kHz steps over a 25.6 MHz range.
Output Isolator
The output circuit includes a special RF device called
an isolator. Its purpose is to block radio signals
from coming back into the transmitter final amplifier
through the antenna.
The isolator suppresses IM (intermodulation) that
can take place between two or more transmitters that
are in close proximity to one another (a few feet).
This form of IM is a particular concern in productions where the transmitters must operate very close
together. Isolators allow the use of higher transmitter
output power without sacrificing IM rejection.
Isolators are rarely found in wireless microphone
transmitters due to the high cost, but they are the
best solution to address multi-channel IM between
multiple transmitters.
Antenna
A newly designed integral antenna allows the transmitter to be held in any position, since the user’s
hands have little or no effect on the radiated power.
Microphone Capsules
The HH/E01 handheld transmitter is available from
Lectrosonics with the HHC cardioid condenser
microphone capsule. Capsules from several other
manufacturers are compatible with the transmitter using an industry standard interface: 1.25” x 28
thread pitch and three contact rings. Dynamic and
condenser microphone heads can be used with the
HH/E01, depending on the user’s preference or the
application.
IR Sync
The HH/E01 is equipped with an IR (infrared) port
for use with receivers that will be developed in the
future. Settings such as frequency stored in the
receiver will be sent to the transmitter via the IR port.
No such receivers are available as of the date of this
writing.
Mute and Talkback Functions
A programmable switch on the housing (side switch)
can be configured for a mute or talkback function.
As a mute switch, it works in a latching manner to
disable and enable the audio signal. Push to mute.
Push again to restore the audio. The mute function
defeats the audio in the transmitter, so it works in all
compatibility modes and will all receivers.
The talkback function provides a communication
channel when used with a receiver equipped with
this function, such as a Venue Wideband receiver
with firmware that enables this function. When
pressed and held in, the side switch re-directs the
audio output to a different audio channel on the
receiver. As soon as the switch is released, audio is
returned to the program channel.
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