Toa DT-920 Specifications

TOA RADIO TUNER

SYNTHESIZED AM/FM TUNER

DT-920

DESCRIPTION

TOA DT-920 is a mono, frequency synthesized, AM/FM
tuner for use in a variety of commercial background and
foreground music systems. Attractively styled, it provides a
number of useful functions, is easy to operate and has low
noise, excellent sensitivity and stability. It has a large digital
display to indicate the selected station, memory preset,
tuning mode and the frequency band selected.
The frequency ranges and frequency steps for both the AM
and FM bands can be changed using a simple power-up
procedure to accommodate differing world broadcast
standards. These can be changed independently for each
band.

Featuring 40 memory presets for stations (CH 1—CH 40),

the DT-920 provides several useful ways to scan for and

select stations using either station frequencies or the
memory preset numbers for the scanning. A scan level
switch selects between local or distant reception
sensitivities and can be set independently for the AM and

FM bands. An automatic up or down station scan selects
the next used frequency or preset. Stations can also be
selected manually with the up/down tuning bar. Both these
tuning methods can be set independently for the AM and
FM bands. Alternately, a station can be selected by directly
entering its frequency or memory preset number into the

display. Selected stations can be stored in any
combination to the 40 memory presets that are retained in a
non-volatile memory when power is turned off.

A fourth, unique method for selecting stations, particularly
useful on job-sites where the local station frequencies are
unknown, is Automatic Preset Tuning (APT).

Functioning in either the local or distant mode, the tuner will
start at the low end of the selected frequency range and
scan upward. The first 20 stations received will be
automatically entered in order into 20 of the memory
presets. This can be done for each band, AM and FM, to
automatically program all 40 presets.

The audio output features two RCA type jacks wired in
parallel and provides a -10dBV output (-8dB ref 0.775V)
capable of driving 10k ohm or higher loads. This provides
a proper match to line inputs on the TOA 900 Series mixers
and amplifiers. The DT-920 includes a 300 ohm FM dipole
antenna and an AM loop antenna, although an outdoor
antenna can be connected in weak or fringe reception
areas. The antennas connect via push-type terminals.
The optional MB-DT920 rack mount kit allows the tuner to
be mounted in a standard 19" E.I.A. equipment rack
occupying two rack spaces.

FEATURES

1.

Presets for 40 AM and/or FM stations.

2. Frequency synthesized digital tuning with multi-function
digital display.

3. Automatic station scan (local or distant) and manual
tuning.

4.

Automatic station storage to memory using auto-scan
mode.

5.

Tuning by direct entry of the station frequency.

6.

Includes an FM dipole and AM loop antenna.

7. Optional rack mount kit available.

SPECIFICATIONS

Configuration

Model Number
Inputs
Output

Performance

AM Input
FM Input
Sensitivity
Nominal Output
Noise

Physical

Enclosure
Dimensions (W x H x D) 16.5 x 3.3 x 10.6in. (420 x 83 x 270mm)
Rack Spaces
Power Consumption
Weight 6.2lbs. (2.8kg)

* 0dB = 0.775V

DT-920
FM and AM antenna
Mono

Loop or long wire antenna

300 ohm antenna

26µ

V AM/3µV FM

-8dB unbalanced

-70dB min

Black

2
6W

APPEARANCE AND DIMENSIONAL DIAGRAM

16.5 (420)

ARCHITECT’S AND ENGINEER’S
SPECIFICATIONS

The tuner shall be a frequency synthesized AM and FM
mono radio receiver with all electronic controls. It shall
receive the AM frequency band from 520 to 1,710kHz in

10kHz steps and FM frequency band from 87.9 to

107.9MHz in 200kHz steps. The receiver capability can be
changed, using a power up function, to receive AM
frequencies from 522 to 1,710kHz in 9kHz steps and FM
frequencies from 87.5 to 108.0MHz in 50kHz steps. This
selection shall be independently selectable for each band.
AM sensitivity shall be 26µV and FM sensitivity shall be 3µV.
A scan level switch shall select between low and high
sensitivity for local/distant type reception and be
independently selectable for each band. The nominal
audio output shall be -8dB unbalanced with a noise level at
least -70dB at maximum FM quieting. Inputs shall be
provided for AM loop and 300 ohm FM antennas.

The tuner shall provide four station selection modes: direct

entry, manual scan, automatic scan and automatic memory

entry scan. Station selection can be by station frequency or

memory preset channel and this function along with the first

three selection modes shall be independently selectable for
the AM and FM bands. The fourth automatic memory entry
scan shall scan the selected AM or FM band, starting from
the lowest end of the frequency range and automatically
enter the first 20 stations received into the memory presets.
AM stations shall be so stored in preset channels CH 21 to
CH 40 and FM stations into presets CH 1 to CH 20.

The front panel shall have the following controls BAND
switch to select the AM of FM band and changing reception
frequency ranges; a up/down tuning bar for station
selection; an AUTO/MANUAL tuning selector, a SCAN
LEVEL selector for local or distant sensitivity; a MEMORY
switch for entering a station into memory and for changing
scan modes; a DIRECT IN for selecting manual entry of the
station frequency; a CH/FREQ switch to select between
scanning frequencies and memory presets; ten PRESET
switches for recalling memory presets and entering station
frequencies and a POWER on/off switch. The rear panel
shall have two RCA type jacks wired in parallel for the audio
output and four push-type terminals for connection of the
AM and FM antennas. One AM antenna terminal shall also
connect internal to chassis ground. A 300 ohm twin-lead
dipole and AM loop antennas shall be included.

An optional rack mount kit, the MB-DT920, shall allow
mounting the tuner in a standard 19" E.I.A. equipment rack,
occupying two rack spaces. The tuner shall be enclosed in
a durable, painted, black steel enclosure with a black
anodized, aluminum front panel. AC line voltage shall be
120V, 60Hz. Power consumption shall be 6W. Overall
dimensions shall be 16.54 x 3.27 x 10.63 in. (420 x 83 x
270mm). Weight shall be 6.17lbs. (2.8kg).

The tuner shall be the TOA DT-920.

TOA Corporation

Specifications are subject to change without notice.

Printed in Japan (408) 833-62-689-30