Lectrosonics HH User Manual download pdf (Page 4)

LECTROSONICS, INC.

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 frequen-

cy is chosen according to which of the 256 channels

has been selected by the frequency switch setting.

This ensures that all transmitters 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 and the

varying sensitivity of different microphone capsules. A

DSP-controlled analog audio limiter is employed be-

fore the A-D converter. The limiter has a range of more

than 30 dB for excellent overload protection. A dual re-

lease envelope makes the limiter acoustically transpar-

ent 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 allow

over 5 hours of operation using two alkaline AA bat-

teries. Lithium batteries will provide over 8 hours of

operation. The battery compartment and contacts are

designed to prevent “rattle” as the unit is handled.

Menu-Driven Control

A high-resolution LCD and control panel with mem-

brane switches provide access to the menu-driven

setup. Transmitter RF power, high-pass ﬁlter, frequency

selection, backlight timeout, mute or talkback functions

and tuning modes are easily accessed.

Frequency Selection

Operating frequency is normally selected using a

receiver or analyzer to assess signals in the local en-

vironment 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 stage produc-

tions 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 helical antenna allows the mic to be

held in any position, since the user’s hands have little

or no effect on the radiated power.

Microphone Capsules

The HH handheld transmitter is available from Lectro-

sonics with the HHC and HHVMC cardioid condenser

capsules. Capsules from several other manufacturers

are also available for use with the HH: those with a

1.25” x 28 thread pitch and three contact rings. Con-

denser or dynamic microphone heads can be used

with the HH, depending on the user’s preference or the

application.

IR Sync

The HH is equipped with an IR (infrared) port for use

with receivers that will be developed in the future. Set-

tings such as frequency stored in the receiver will be

sent to the transmitter via the IR port. No such receiv-

ers are available as of the date of this writing.

Side Button Functions

A programmable switch on the side of the housing can

be conﬁgured as a mute or cough switch, to provide a

talkback, a power switch, or be disabled.

The talkback function provides a communication

channel when used with a receiver equipped with this

function, such as a Venue Wideband receiver with

ﬁrmware Ver. 5.2 or higher. 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.

The talkback function works only in the Digital Hybrid

compatibility mode.

See page 11 for details.

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