Lectrosonics SMQV/941 Manual

Lectrosonics Ikke kategoriseret SMQV/941

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Side 1/4

SMV Series

Miniature Transmitters

TECHNICAL DATA

Rio Rancho, NM, USA

www.lectrosonics.com

Digital Hybrid Wireless® is a revolutionary new design

that combines digital audio with an analog FM radio link

to provide outstanding audio quality and the exemplary

RF performance of the ﬁnest analog wireless systems.

This overcomes channel noise in a dramatically new

way, 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 pro-

prietary algorithm is not a digital implementation of an

analog compandor. Instead, it is a technique which can

be accomplished only in the digital domain.

The process eliminates compandor artifacts, expand-

ing the applications to include test and measurement of

acoustic spaces and musical instruments.

*US Patent 7,225,135

To meet the demand for both extended operating

range and extended battery life, the “V” series SM

transmitters offer selectable output power ranging

from 50, 100 and 250 mW (941 offers 50 or 100 mW)

on the single and dual battery model. With higher

power output, the operating range is improved at the

expense of battery life. When range is not an issue,

the power can be reduced to extend the battery life.

Both models are compatible with the LectroRM app

for setup and adjustment using audible hands free

tones delivered into the microphone from a mobile

phone. The transmitter can be put to sleep to con-

serve battery power during setup while the transmitter

is buried deep inside costuming, then awakened for

normal operation when the production begins. Other

features include frequency and audio level adjustment

and control lockout.

• Selectable output power to maximize

battery life or operating range

• Ultra-lightweight, corrosion resistant

housing

• Water resistant seals for use in damp

environments

• LCD interface with lockout option

• Programmable compatibility modes

for use with a wide variety of different

receivers

• Servo Bias input circuitry with

selectable voltage

The input section features the unique servo bias

input circuitry with a standard TA5M type jack for

use with electret lavaliere mics, dynamic mics, or line

level signals. A DSP-controlled analog audio limiter

is employed ahead of the ﬁrst mic preamp to protect

the entire audio chain from overload. The limiter has

a range of more than 30 dB for excellent overload

protection and a dual release envelope that makes

the limiter acoustically transparent while maintaining

low distortion. The limiter recovers quickly from brief

transients, with no distortion.

A water resistant control panel with LCD, membrane

switches and multi-color LEDs make input gain adjust-

ments, frequency and compatibility mode selection

quick and accurate. The battery compartment accepts

AA batteries (Lithium recommended).

The housings are machined from solid aluminum

blocks to provide an extremely lightweight and rugged

package. A special non-corrosive ﬁnish resists salt

water exposure and perspiration in extreme environ-

ments.

SMQV, SMQV-941, SMQV/X Dual Battery Models

SMV, SMV-941, SMV/X Single Battery Models

High Power Output and Long Battery Life

Variable power provides the choice of maximum power

output for extended operating range and interference

suppression, or lower power output for extended bat-

tery life when operating in less demanding RF condi-

tions.

Adjustable Low Frequency Roll-o

The low frequency roll-off can be set for 3 dB down

points at 35, 50, 70, 100, 120 or 150 Hz to control sub-

sonic and very low frequency audio content.

30 100 1kHz 10k 20k

0dB

-3

-6

-9

-12

Line in

Mic in 150 Hz

Roll-off

Mic in 35 Hz

Roll-off

DSP-Based Pilot Tone & Compatibility

The DSP generated pilot tone eliminates the need for

fragile crystals and allows a different pilot tone fre-

quency for each of the carrier frequencies in the tuning

range of the wireless system. Individual pilot tones

signiﬁcantly reduce squelch problems in multichannel

systems where a pilot tone signal can appear in the

wrong receiver via intermodulation products.

Input Limiter

A DSP-controlled analog audio limiter is employed

before the analog-to-digital converter. The limiter

has a range of more than 30 dB for excellent over-

load protection. A dual release envelope makes the

limiter acoustically transparent while maintaining

low distortion. The limiter recovers quickly from brief

transients, so that its action is hidden from the lis-

tener, but recovers slowly from sustained high levels,

to keep audio distortion low and preserve short term

dynamic changes.

The bicolor LEDs accurately indicate limiter activity

to assist in setting the input gain for optimal signal to

noise ratio and dynamic range.

Circulator/Isolator

The transmitter RF output circuit includes a special-

ized RF device called a “circulator/isolator” or simply

“isolator” using a magnetically polarized ferrite to

allow RF signals to pass through to the antenna, but

block them from coming backward into the transmitter

output section.

This greatly reduces RF intermodulation produced in

the transmitter output stages when multiple units are

used in close proximity (a few feet apart). The isolator

also helps protect the output stage from electrostatic

shock delivered to the antenna. Isolators are com-

mon in broadcast and commercial applications, but

because of their high cost it is unusual to ﬁnd them in

wireless microphone systems.

GORE-TEX® Vent

In special circumstances it is possible for moisture

to be pulled into the housing when a unit is moved

from a warm, damp operating environment, turned

off and stored in a cool place. As the warm air inside

the unit cools a vacuum is created, pulling air in past

the exterior of the housing, bringing moisture with it.

SMV Series Transmitters Block Diagram

Variable 1.8 - 4v

+6V

+5V 5V

Regulator

11.289 MHz

12.000 MHz

Produkt Specifikationer

Mærke:	Lectrosonics
Kategori:	Ikke kategoriseret
Model:	SMQV/941

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