DRAKE AUDIOACCENT Instruction Manual Download Page 7

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Introduction - General Description 1

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.

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).

Sound System Amplifier

Microphones

(wired or wireless type)

Loudspeakers

ALT 1000 Transmitter

MEMO

TUNING

digital
receiver

MEMO

TUNING

digital
receiver

MEMO

TUNING

digital
receiver

MEMO

TUNING

digital
receiver

MR306 FM Receivers with Earphones

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 / buttons. The
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

to +50

C. The transmit-

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

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 / TUNING
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
powered by two “AAA” size, 1.5 V batteries with power
controlled by an ON/OFF switch. The headphone wiring
shall provide the FM antenna.