DRAKE AUDIOACCENT Руководство по эксплуатации - Страница 7

Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Приемник DRAKE AUDIOACCENT. DRAKE AUDIOACCENT 16 страниц. Assistive listening system

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The ALT 1000 is a wideband FM Listening System which

operates in the 72 - 76 MHz frequency band. Designed

for hearing assistance in places of public access, the

ALT 1000 is for those who need help overcoming

background noise, reverberation, or distance from the

sound source. It is easily integrated with your existing

sound system.

Loudspeakers

Line-Level

Input

OVER MODULATION

LEVEL

MONITOR OUTPUT

MONITOR

INPUT

LEFT

RIGHT

ALT 1000 Transmitter

ARCHITECTURAL AND ENGINEERING

SPECIFICATIONS

The transmitter shall operate in the 72 - 76 MHz Auditory

Assistance Band as approved by the FCC. Specifically, the

transmitter shall operate on the wideband channels spaced

at 100 kHz increments on frequencies of 72.1 to 72.9 MHz,

74.7 MHz, and 75.3

to 75.9 MHz. The transmitted field

strength shall not exceed 80 millivolts per meter at a 3 meter

distance. The operating frequency and mode; Stereo or

Mono shall be shown on an LCD display and be

programmable by front panel TUNE

transmitter shall be FCC and Industry Canada approved.

Maximum FM deviation shall not exceed ±75 kHz.

Frequency stability shall be controlled by a phase-locked

loop frequency synthesizer with crystal reference and shall

be accurate within ±0.001% from 0

ter shall permit fitting of a 7" flexible whip antenna mounted

through the top cover of the unit, or permit connection of an

optional magnet mount antenna, with coaxial cable, to a rear

panel connector. Only the particular antenna type intended

for this connection shall be specified.

The transmitter shall have XLR connectors for balanced

audio inputs and RCA Phono connectors for unbalanced

audio inputs. The transmitter shall provide a GROUND

LIFT switch for the XLR inputs. The transmitter shall provide

full deviation for monaural input signals to the LEFT AUDIO

INPUT connectors when programmed for the MONO mode.

The transmitter shall permit switch selection of no limiting,

limiting only, or limiting and compression operation from a

rear panel switch. There shall be a front panel control to

Introduction - General Description

Sound System Amplifier

ALT 1000 ASSISTIVE LISTENING TRANSMITTER

TUNE

72.1 MHz Stereo

FREQUENCY

buttons. The

to +50

C. The transmit-

The Assistive Listening System has two principal parts:

the ALT 1000 Assistive Listening Transmitter, and the

MR306 FM Receivers. Audio input to the ALT 1000 is

broadcast as an FM signal (72.1 - 72.9 MHz, 74.7 MHz,

and 75.3 - 75.9 MHz) to as many MR306 receivers as

desired. The receivers pick up the broadcast in an area

up to approximately 700,000 square feet (approximate

radius of 500 feet).

Microphones

(wired or wireless type)

Line-Level Output

MR306 FM Receivers with Earphones

digital

receiver

TUNING

adjust the audio input level with an LED (OVER)

MODULATION indicator.

There shall be a front panel 1/4" stereo monitor jack with

volume control.

The transmitter shall be powered by an external AC line to

12 VDC power adapter. The rear panel shall have a power

switch and front panel display indication when power is

active. The transmitter shall be rack mountable in a

standard 1 RU rack package.

The receiver shall be tunable in 100 kHz increments for

reception in the 72 - 108.1 MHz Band. Tuning to the

required frequency shall be permitted by the

buttons or by user programmable memory recall. The

receiver shall have five preset memory channels that are

recalled by individual memory channel buttons. The receiver

shall be equipped with a LOCK switch to prevent inadvertent

setting changes. The receiver shall be set to either

STEREO or MONO reception with a switch. The receiver

shall have a Volume control. The receiver shall have a 1/8"

stereo/mono headphone connector and a switch to select

audio output to either the headphone (EAR) connector or to

the internal speaker (SPK). The output power shall be

10 mW + 10 mW to the headphone (EAR) connector or

30 mW to the internal speaker. The receiver shall be

controlled by an ON/OFF switch. The headphone wiring

shall provide the FM antenna.

The R.L. Drake ALT 1000 Assistive Listening Transmitter

with MR306 FM Receiver(s) system is specified.

digital

receiver

TUNING