Rear Panel Controls and Connections 3
5. LEFT AUDIO INPUT - Connect monaural audio input
signals to the appropriate unbalanced or balanced LEFT
AUDIO INPUT connector. For monaural input, program
the ALT 1000 to display ‘MONO’. See Item 5;
'TUNE
/
Buttons' in the ‘Front Panel Controls and
Indicators' section of this manual. For stereo input,
connect an unbalanced line level left channel stereo
audio signal to the phono connector or connect a
balanced line level left channel stereo audio signal to the
3-pin female XLR connector. The unbalanced phono
style input and the XLR balanced input on a given input
(Left or Right) are each always active, so audio will be
fed from whichever input is being used. Do not attempt
to connect signals to both the unbalanced and
balanced connectors on a given input (Left or Right).
All inputs can be considered high impedance (>20K
Ohm). The shield connection at pin 1 of the XLR
connector can be conveniently connected to ground
(GROUND LIFT = ‘OFF’) or lifted from ground (GROUND
LIFT = ‘ON’) to eliminate hum or noise as required. For
stereo input, program the ALT 1000 to display
‘STEREO’. See ‘Front Panel Controls and Indicators:
See Item 5; 'TUNE
/
Buttons' in the ‘Front Panel
Controls and Indicators' section of this manual.
6. GROUND LIFT Switch - Set to the ‘OFF’ position to
connect pin 1 of both LEFT and RIGHT XLR connectors
to ground. Set to the ‘ON’ position to disconnect both
XLR connectors from ground.
7. RIGHT AUDIO INPUT - For stereo input, connect an
unbalanced line level right channel stereo audio signal to
the phono connector or connect a balanced line level
right channel stereo audio signal to the 3-pin female XLR
connector. Never connect signals to both the
unbalanced and balanced connectors on a given input
(Left or Right). The shield connection at pin 1 of the
XLR connector can be conveniently connected to ground
(GROUND LIFT = ‘OFF’) or lifted from ground (GROUND
LIFT = ‘ON’) to eliminate hum or noise as required. For
stereo input, program the ALT 1000 to display
‘STEREO’. See Item 5; 'TUNE
/
Buttons' in the
‘Front Panel Controls and Indicators' section of this
manual. Connect a monaural audio signal to the
appropriate LEFT AUDIO INPUT connector. See Item 5:
'LEFT AUDIO INPUT', on this page.
1 2 3 4 5 6 7
--
--
2 0 K
2 0 K
2 0 K
U N B A L A N C E D
1 6 T O 4 d B u
+
--
B A L A N C E D
B A L A N C E D
U N B A L A N C E D
--
1 G N D
--
2 H I G H
--
3 L O W
1 0 T O 1 0 d B u
+
--
1 6 T O 4 d B u
+
--
1 0 T O 1 0 d B u
+
--
G R O U N D
L I F T
M A D E I N U . S . A .
BY
R
D C I N P U T
O N
O F F
1 2 V D C 2 5 0 m A
+
--
P O W E R
R F O U T P U T
- E X T. A N T E N N A -
L I M I T I N G /
C O M P R E S S I O N
O F F C + L
L
L E F T A U D I O
I N P U T
O N
O F F
R I G H T A U D I O
I N P U T
( M O N O )
F C C I D : C A R 1 0 0 2 4 3 4
C A N A D A : 2 7 8 5 1 0 2 5 2 1
T H I S D E V I C E C O M P L I E S W I T H F C C R U L E S P A R T 1 5 .
O P E R A T I O N I S S U B J E C T T O T H E F O L L O W I N G T W O
C O N D I T I O N S : ( 1 ) T H I S D E V I C E M A Y N O T C A U S E
H A R M F U L I N T E R F R E N C E A N D ( 2 ) T H I S D E V I C E
M U S T A C C E P T A N Y I N T E R F E R E N C E T H A T M A T B E
R E C E I V E D , I N C L U D I N G I N T E R F E R E N C E T H A T M A Y
C A U S E U N D E S I R E D O P E R A T I O N .
2 0 K
1. DC INPUT - Connect the supplied AC Adapter to this
connector. Secure AC Adapter DC cable with the
adjacent rear panel strain relief.
2. POWER ON/OFF Switch - Set this switch to the ‘ON’
position to operate the ALT 1000.
3. RF OUTPUT/EXTERNAL ANTENNA - Connection for
the optional magnet mount antenna only. This connec-
tor type permits fitting only the R.L. Drake Company
supplied magnet mount optional antenna.
4. LIMITING/COMPRESSION SWITCH - This switch
selects the operation of the limiter. Select the proper, or
desired, setting according to the following criteria:
“OFF” - For audio sources with limiting and/or
compression already applied. This setting bypasses the
limiting circuitry of the ALT 1000. With the audio source
connected, adjust the INPUT LEVEL control to a setting
at or just below the point where the (OVER) MODULA-
TION indicators light on audio peaks.
“L” - For most types of audio sources and listening
environments. This setting provides automatic limiting
on audio peaks to prevent loud bursts and to avoid over
modulation conditions which can cause distorted audio
at the receiver. With the audio source connected, (for
example, the output of a public address amplifier with a
person speaking at a normal level into the microphone),
adjust the INPUT LEVEL control to a setting at the point
where the (OVER) MODULATION indicators light on
audio peaks.
“C+L” - For audio sources that contain relatively low
audio levels combined with relatively high audio levels
as might be encountered when the audio output from a
public address amplifier contains audio from multiple
microphones with different persons speaking. This
setting provides automatic increasing of the low level
audio passages combined with limiting on voice peaks.
This type of audio processing can sometimes aid
intelligibility for a person receiving the signal while
located in a relatively noisy audio environment. With the
audio source connected, and the weaker audio levels
active, adjust the INPUT LEVEL control to a setting at or
just below the point where the (OVER) MODULATION
indicators light on audio peaks.
Summary of Contents for AUDIOACCENT
Page 2: ......
