Crystal Vision Indigo AADA416FM User manual

AADA416FM
Analogue Audio Distribution Amplifier
Crystal Vision Ltd., Lion Technology Park, Station Road East, Whittlesford, Cambridge, CB22 4WL, England.
Tel: [phone] Fax: [phone] [e-mail] www.crystalvision.tv

Crystal Vision AADA416FM User Manual
Contents
1Introduction 2
2Card edge operation 4
Overvoltage detection level 4
Silence detection 5
Gain 5
3Hardware installation 6
3.1 Rear module signal I/O 6
RM17 rear module connections 6
RM37 rear module connections 8
3.2 Using unbalanced audio 9
3.3 General purpose interface 10
3.4 Configuration 13
Linking audio channels together 14
Matching different operating levels 15
Overvoltage LED inhibit 16
Using the monitoring output 17
Other board links 17
4Trouble shooting 18
Basic fault finding guide 19
5Specification 20
Revision 3
RM37 information added
27/10/06
Revision 4
RM37 connection tables updated (pages 9-10)
16/11/07
Revision 5
Output specification amended (page 22)
07/08/08
Revision 6
RM37 phasing amended (page 10)
25/11/09
Revision 7
RM37 Audio out table amended (page 10)
02/03/10
Revision 8
RM17 label information amended (page 7)
08/08/12
AADA416FM User Manual R1.8 1 18 January 2019

Crystal Vision
Introduction
Crystal Vision Introduction
1 Introduction
The AADA416FM is a quad audio distribution amplifier with individually balanced
floating outputs. It has card edge control and can be configured in a variety of
input/output configurations. There are four separate audio distribution amplifiers each
with an electronically balanced input and four floating outputs. Onboard links allow the
module to be configured in any of the following modes:
•4 channels - each channel is 1-in 4-out
•3 channels - channels 1 and 2 are 1-in 4-out; channel 3 is 1-in 8-out
•2 channels - channels 1 and 3 are 1-in 8-out
•2 channels - channel 1 is 1-in 4-out; channel 2 is 1-in 12-out
•1 channel - channel 1 is 1-in 16-out
It is very compact in design and depending upon frame selection, allows up to 96 1-in, 4-
out distribution amplifiers in a single frame.
Audio gain is adjustable to suit operating levels of 18dBu and *24/28dBu with the
provision of on-board movable jumper links. Continuous variable control of level is
available from the card-edge.
AADA416FM quad distribution amplifier
Note: *The maximum input signal level is +28dBu and the maximum output level is
+25dBu.
AADA416FM User Manual R1.8 2 18 January 2019

Crystal Vision
Introduction
Crystal Vision Introduction
Each channel has an audio silence detector with common adjustable settings.
The silence detect delay is selectable from around 2 seconds to 120 seconds in 15 eight
second steps. Its default value is 1-2 seconds.
The silence threshold level can be adjusted from -18dBu to -42dBu and its default value is
–30dBu.
Each channel also has an overvoltage detector that can be adjusted from +6dBu to
+25dBu, by a common OV control. The default value is +25dBu.
The AADA416FM has LED indication of audio silence and overvoltage status for each
channel. General purpose interface lines are also provided to indicate audio
silence/overvoltage status.
Two 3.5mm jacks are provided for local audio monitoring using headphones. The main
features are as follows:
•Quad audio distribution amplifier with five configuration modes
•Suitable for level-matching international operating levels of
+18/+24/+28dBu to European levels (+18/+24dBu)
•Per channel silence detection with global adjustment of the threshold
level and delay
•Per channel overvoltage detector with global adjustable of the threshold
level
•Electronically balanced inputs and outputs
•Headphone monitoring for all channels
•GPI silence/overvoltage indication
•Card edge control
The AADA416FM is a 100mm x 266mm module, which fits in all standard Crystal
Vision frames and can be integrated with any boards from the company’s full product
range. It uses the RM17 and RM37 single height rear connectors.
Note: *The maximum input signal level is +28dBu and the maximum output level is
+25dBu.
AADA416FM User Manual R1.8 3 18 January 2019

Card edge
ti
Crystal Vision Card edge operation
2 Card edge operation
Once the start-up initialisation procedure is complete, the AADA416FM can be controlled
or configured from the card edge controls.
The front card-edge provides power rail monitoring, channel gain adjustment, silence
threshold, silence time, overvoltage level and two analogue audio monitoring outputs.
AADA416FM front edge view
LED INDICATION
LED Action
Meaning
Yellow (top left)
Yellow (bottom left)
Yellow (top right)
Yellow (bottom right)
Green (top)
Green (bottom)
LED bright
LED dim
LED bright
LED dim
LED bright
LED dim
LED bright
LED dim
LED on
LED on
Audio 1 Overvoltage
Audio 1 Silence
Audio 2 Overvoltage
Audio 2 Silence
Audio 3 Overvoltage
Audio 3 Silence
Audio 4 Overvoltage
Audio 4 Silence
+ 5V power supply OK
+/- 18Vpower supply OK
LED indicators
Overvoltage detection level
Overvoltage detection level, labelled OV is adjustable from the front of the board.
Turning the potentiometer fully clockwise will set the overvoltage limit to +25dBu. The
potentiometer range is from 6dBu to 25dBu.
Any peak audio signals, which exceed the overvoltage limit, will illuminate the
corresponding LED brightly. It will remain lit for at least one second after the peak audio
signal has dropped below the overvoltage limit.
Note: LED indication of overvoltage may be inhibited by a board link. GPI overvoltage
warning (and silence warning) can be inhibited using GPI inputs. Please see the
Configuration section in the Installation chapter for more details.
AADA416FM User Manual R1.8 4 18 January 2019

Card edge
ti
Crystal Vision Card edge operation
Silence detection
A channel is only considered to be silent if its audio level remains below a certain
threshold level for longer than a given time (detection delay).
Silence detection level
Silence detection level labelled Sil is adjustable from the front of the board. It is factory
set to an output level of –30dBu. Audio signals above this level (and below the
overvoltage level) will produce no illumination of the corresponding LED.
The potentiometer range is from –42dBu to –18dBu
Silence detection delay
A 16 position switch at the front of the board labelled Sil Time, determines the time
duration to detect that an audio signal is continuously below the silence detection level
limit. Although there is only one Sil Time setting, each of the four channels is timed
individually.
Position 0 is a time of 1 to 2 seconds, position 1 is approximately 8 seconds, and for
position steps of 2 to 9 and A to F add on another 8 seconds for each step giving a
maximum time of 120 seconds for position F.
Sil time
setting
Silence delay
in seconds
Sil time
setting
Silence delay
in seconds
0
1
2
3
4
5
6
7
1 to 2
8
16
24
32
40
48
56
8
9
A
B
C
D
E
F
64
72
80
88
96
104
112
120
If these times are exceeded the LED for that channel will illuminate dimly and stay
illuminated dimly until the audio signal level is greater than the silence level. If this
occurs without any overload, the LED will turn off.
Note: GPI silence warning (and overvoltage warning) can be inhibited using GPI
inputs. Please see the Configuration section in the Installation chapter for more details.
Gain
Gain is continuously variable ± 6.0dB for each channel using the four Gain Adjust
controls. The AADA416FM is supplied with a factory-set gain of 0dB. The maximum
operating level may be adjusted for either +18dBu or +24/+*28dBu using on-board links
as explained in the configuration section of the Installation chapter.
Note: *The maximum input signal level is +28dBu and the maximum output level is
+25dBu.
AADA416FM User Manual R1.8 5 18 January 2019

Crystal Vision Hardware installation
3 Hardware installation
The AADA416FM quad distribution amplifier fits into all Crystal Vision rack frames. All
modules can be plugged in and removed while the frame is powered without damage.
3.1 Rear module signal I/O
The AADA416FM is used with the RM17 and RM37 single slot rear connectors in all
Crystal Vision frames.
The 4U Indigo frame will house up to 24 modules and triple power supplies. The 2U
Indigo frame will house up to 12 modules and dual power supplies. The 1U Indigo frame
will house 6 modules and a single power supply.
The 1U desk top box has a built-in power supply and will house up to 2 modules.
On the 1U, 2U and 4U frames a hinged front panel gives access to the PSU and all
modules. The desk top box has a removable front. The universal frame wiring system
allows any of the interface range of modules to be fitted in any position with the use of
removable rear modules.
RM17 rear module connections
RM17 fits in all frames Description
RM17 (ZLA00099 artwork)
•24 modules per 4U frame, 12
per 2U frame, 6 per 1U frame
& 2 per desk top box
•All frame slots can be used
For details of fitting rear connectors please refer to the appropriate frame manual.
AADA416FM User Manual R1.8 6 18 January 2019

Crystal Vision Hardware installation
Audio in - 15 pin D-Type connector (cable has plug on it)
Pin number
Function
Comments
1
IP-1LO
Screen for input 1
2
3
IP-L1+ IP-
L1-
}
Stereo 1 Left input (Audio 1 )
4
5
IP-L2+ IP-
L2-
}
Stereo 2 Left input (Audio 3 )
6
IP-2LO
Screen for input 2
7
8
N/C
N/C No connection
9
10
IP-R1+ IP-
R1- } Stereo 1 Right input (Audio 2 )
11
12
IP-R2+ IP-
R2- } Stereo 2 Right input (Audio 4 )
13
GND (Chassis )
14
IP-3LO
Screen for input 3
15
IP-4LO
Screen for input 4
Note: Stereo 1 channel uses Audio 1 for left signal (L1) and Audio 2 for right signal (R1).
Stereo 2 channel uses Audio 3 for left signal (L2) and Audio 4 for right signal (R2).
In 2-in, 2x8-out mode, it is worth noting that headphone monitor 1 has audio 1 on both
channels, and headphone monitor 2 has audio 3 on both channels.
Audio out - 44 pin high density D-Type connector (cable has plug on it)
Pin Signal Desc Pin Signal Desc Pin Signal Desc
1
GND
16
OP1B-
Audio 1
31
OP1A+
Audio 1
2
OP1A-
Audio 1
17
OP1B+
Audio 1
32
OP1C+
Audio 1
3
OP1D-
Audio 1
18
OP1C-
Audio 1
33
OP1D+
Audio 1
4
GND
19
GND
34
GND
5
OP2B-
Audio 2
20
OP2A-
Audio 2
35
OP2A+
Audio 2
6
OP2C-
Audio 2
21
OP2D-
Audio 2
36
OP2B+
Audio 2
7
GND
22
OP2C+
Audio 2
37
OP2D+
Audio 2
8
OP3A-
Audio 3
23
GND
38
GND
9
OP3D-
Audio 3
24
OP3C-
Audio 3
39
OP3A+
Audio 3
10
OP3B-
Audio 3
25
OP3C+
Audio 3
40
OP3B+
Audio 3
11
GND
26
OP3D+
Audio 3
41
GND
12
OP4C-
Audio 4
27
GND
42
OP4A+
Audio 4
13
OP4D-
Audio 4
28
OP4A-
Audio 4
43
OP4C+
Audio 4
14
OP4B-
Audio 4
29
OP4B+
Audio 4
44
OP4D+
Audio 4
15
GND
30
GND
AADA416FM User Manual R1.8 7 18 January 2019

Crystal Vision Hardware installation
Arrangement of audio outputs and GND pins on 44 way D-Type Connector
RM37 rear module connections
RM37 fits in all frames Description
RM37
•24 modules per 4U frame, 12
per 2U frame, 6 per 1U frame
& 2 per desk top box
•All frame slots can be used
For details of fitting rear connectors please refer to the appropriate frame manual.
Audio in
Pin number
Function
Comments
a1
a2
IP-L1+ IP-
L1-
}
Stereo 1 Left input (Audio 1 )
a3
Input_LO
Screen for input 1
a4
a5
IP-R1+ IP-
R1- } Stereo 1 Right input (Audio 2 )
a6
Input_LO
Screen for input 2
a7
NC
No connection
a8
GND
c1
c2
IP-L2+ IP-
L2-} Stereo 2 Left input (Audio 3 )
c3
Input_LO
Screen for input 3
c4
c5
IP-R2- IP-
R2+ } Stereo 2 Right input (Audio 4)
c6
Input_LO
Screen for input 4
c7
NC
No connection
c8
GND
Note: Stereo 1 channel uses Audio 1 for left signal (L1) and Audio 2 for right signal (R1).
Stereo 2 channel uses Audio 3 for left signal (L2) and Audio 4 for right signal (R2).
In 2-in, 2x8-out mode, it is worth noting that headphone monitor 1 has audio 1 on both
channels, and headphone monitor 2 has audio 3 on both channels.
AADA416FM User Manual R1.8 8 18 January 2019

Crystal Vision Hardware installation
Audio out
Pin Signal Description Pin Signal Description
a9
a10
OP1A+
OP1A-Audio 1
c9
c10
OP1B-
OP1B+ Audio 1
a11
GND
c11
GND
a12
a13
OP1C-
OP1C+ Audio 1
c12
c13
OP1D-
OP1D+ Audio 1
a14
GND
c14
GND
a15
a16
OP2A-
OP2A+ Audio 2
c15
c16
OP2B-
OP2B+ Audio 2
a17
GND
c17
GND
a18
a19
OP2C+
OP2C-Audio 2
c18
c19
OP2D-
OP2D+ Audio 2
a20
GND
c20
GND
a21
a22
OP3A+
OP3A-Audio 3
c21
c22
OP3B+
OP3B-Audio 3
a23
GND
c23
GND
a24
a25
OP3C-
OP3C+ Audio 3
c24
c25
OP3D-
OP3D+ Audio 3
a26
GND
c26
GND
a27
a28
OP4A+
OP4A-Audio 4
c27
c28
OP4B+
OP4B-Audio 4
a29
GND
c29
GND
a30
a31
OP4C-
OP4C+ Audio 4
c30
c31
OP4D-
OP4D+ Audio 4
a32
NC
c32
NC
Note: Pin numbers refer to the plug numbering scheme.
3.2 Using unbalanced audio
As the AADA416FM outputs are floating, it is possible to obtain up to 16 unbalanced
audio outputs by wiring the RM17 or RM37 in the correct manner.
An unbalanced output may be obtained by using either the +ve or –ve phase of the audio
signal pair. To produce the required unbalanced output the unused phase of the signal pair
must then be connected to the signal ground.
Note: It is recommended to set the input gain to -6dB (using PL12-15) to avoid output clipping when
using unbalanced output connections. This is because connecting one phase to ground
increases the level on the other phase by +6dB.
To avoid damage to driver outputs, do not connect both phases to ground.
AADA416FM User Manual R1.8 9 18 January 2019

Crystal Vision Hardware installation
3.3 General purpose interface
GPI outputs ‘a’ to ‘d’ use switch-closure to indicate AADA416FM status. When closed-
circuit, the GPI line is connected to Frame Ground.
As supplied, each GPI output has a 330 Ohm resistor in series with its output. This allows
for an external LED connected to a dc supply voltage of +5V. GPI inputs ‘e’ and ‘f’ have
a pull up 10k Ohm resistor to +5V.
GPI lines ‘e’ and ‘f’ control the overvoltage and silence warning GPI outputs.
GPI status:
GPI Closed-circuit (Ground) Open-circuit
‘a’
Audio 1 silence/overvoltage warning
Audio 1 silence/overvoltage is OK
‘b’ Audio 2 silence/overvoltage warning
Audio 2 silence/overvoltage is OK
‘c’ Audio 3 silence/overvoltage warning
Audio 3 silence/overvoltage is OK
‘d’ Audio 4 silence/overvoltage warning
Audio 4 silence/overvoltage is OK
‘e’ (input)
GPI ‘a’ to ‘d’ overvoltage indication is GPI ‘a’ to ‘d’ indicates overvoltage warning
inhibited
and silence warning (depends on ‘f’ input)
‘f’ (input)
GPI ‘a’ to ‘d’ silence indication is inhibited GPI ‘a’ to ‘d’ indicates silence warning and
overvoltage warning (depends on ‘e’ input)
AADA416FM User Manual R1.8 10 18 January 2019

Crystal Vision Hardware installation
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
8 (1)
9 (1)
18 (1)
26 (1)
19 (2)
20 (2)
2
7 (1)
16 (1)
17 (1)
25 (1)
10 (2)
11 (2)
3
8 (3)
9 (3)
18 (3)
26 (3)
19 (4)
20 (4)
4
7 (3)
16 (3)
17 (3)
25 (3)
10 (4)
11 (4)
5
5 (1)
6 (1)
15 (1)
24 (1)
1 (2)
2 (2)
6
4 (1)
14 (1)
13 (1)
23 (1)
3 (2)
4 (2)
Up
5 (3)
6 (3)
15 (3)
24 (3)
1 (4)
2 (4)
8
4 (3)
14 (3)
13 (3)
23 (3)
3 (4)
4 (4)
9
3 (1)
12 (1)
22 (1)
21 (1)
12 (2)
13 (2)
10
10 (1)
11 (1)
19 (1)
20 (1)
21 (2)
22 (2)
11
3 (3)
12 (3)
22 (3)
21 (3)
12 (4)
13 (4)
12
10 (3)
11 (3)
19 (3)
20 (3)
21 (4)
22 (4)
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
8 (5)
9 (5)
18 (5)
26 (5)
19 (6)
20 (6)
2
7 (5)
16 (5)
17 (5)
25 (5)
10 (6)
11 (6)
3
8 (7)
9 (7)
18 (7)
26 (7)
19 (8)
20 (8)
4
7 (7)
16 (7)
17 (7)
25 (7)
10 (8)
11 (8)
5
5 (5)
6 (5)
15 (5)
24 (5)
1 (6)
2 (6)
6
4 (5)
14 (5)
13 (5)
23 (5)
3 (6)
4 (6)
7
5 (7)
6 (7)
15 (7)
24 (7)
1 (8)
2 (8)
L
4 (7)
14 (7)
13 (7)
23 (7)
3 (8)
4 (8)
9
3 (5)
12 (5)
22 (5)
21 (5)
12 (6)
13 (6)
10
10 (5)
11 (5)
19 (5)
20 (5)
21 (6)
22 (6)
11
3 (7)
12 (7)
22 (7)
21 (7)
12 (8)
13 (8)
12
10 (7)
11 (7)
19 (7)
20 (7)
21 (8)
22 (8)
per
4U frame GPI Connections
GPI lines ‘a’ to ‘f’ of each card connect to one of eight rear remote connectors as follows:
7
Note: Remote 1, Remote 3, Remote 5 and Remote 7 are 26 way high density ‘D’ type female
sockets and frame ground is pin 2 and +5V @500mA is pin 1 in each case.
Remote 2 and Remote 4 are 26 way high density ‘D’ type male plugs and frame ground is
pin 6 and +5V @500mA is pin 15 in each case.
AADA416FM User Manual R1.8 11 18 January 2019

Crystal Vision Hardware installation
2U frame GPI Connections
GPI lines ‘a’ to ‘f’ of each card connect to one of four rear remote connectors as follows:
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
8 (1)
9 (1)
18 (1)
26 (1)
19 (2)
20 (2)
2
7 (1)
16 (1)
17 (1)
25 (1)
10 (2)
11 (2)
3
8 (3)
9 (3)
18 (3)
26 (3)
19 (4)
20 (4)
4
7 (3)
16 (3)
17 (3)
25 (3)
10 (4)
11 (4)
5
5 (1)
6 (1)
15 (1)
24 (1)
1 (2)
2 (2)
6
4 (1)
14 (1)
13 (1)
23 (1)
3 (2)
4 (2)
7
5 (3)
6 (3)
15 (3)
24 (3)
1 (4)
2 (4)
8
4 (3)
14 (3)
13 (3)
23 (3)
3 (4)
4 (4)
9
3 (1)
12 (1)
22 (1)
21 (1)
12 (2)
13 (2)
10
10 (1)
11 (1)
19 (1)
20 (1)
21 (2)
22 (2)
11
3 (3)
12 (3)
22 (3)
21 (3)
12 (4)
13 (4)
12
10 (3)
11 (3)
19 (3)
20 (3)
21 (4)
22 (4)
Table shows Pin number (Remote number)
Note: Remote 1 and Remote 3 are 26 way high density ‘D’ type female sockets and frame
ground is pin 2 and +5V @500mA is pin 1 in each case.
Remote 2 and Remote 4 are 26 way high density ‘D’ type male plugs and frame ground is
pin 6 and +5V @500mA is pin 15 in each case.
1U frame GPI connections
GPI lines ‘a’ to ‘f’ of each card connect to one of two rear remote connectors as follows:
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
8 (1)
9 (1)
18 (1)
26 (1)
19 (2)
20 (2)
2
7 (1)
16 (1)
17 (1)
25 (1)
10 (2)
11 (2)
3
5 (1)
6 (1)
15 (1)
24 (1)
1 (2)
2 (2)
4
4 (1)
14 (1)
13 (1)
23 (1)
3 (2)
4 (2)
5
3 (1)
12 (1)
22 (1)
21 (1)
12 (2)
13 (2)
6
10 (1)
11 (1)
19 (1)
20 (1)
21 (2)
22 (2)
Table shows Pin number (Remote number)
Note: Remote 1: 26 way high density D-type socket. Frame ground is pin 2 and +5V @500mA is pin
1.
Remote 2: 26 way high density D-type plug. Frame ground is pin 6 and +5V @500mA is
pin 15.
AADA416FM User Manual R1.8 12 18 January 2019

Crystal Vision Hardware installation
DTB-AV desk top box GPI connections
GPI lines ‘a’ to ‘f’ of each card connect to the rear remote connector as follows:
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
1
2
3
4
5
6
2
9
10
11
12
13
14
Note: Remote connector is 15-way normal density D-type socket. Frame ground is pin 15.
Indigo DT desk top box GPI connections
GPI lines ‘a’ to ‘f’ of each card connect to the rear remote connector as follows:
Slot no.
‘a’ pin
‘b’ pin
‘c’ pin
‘d’ pin
‘e’ pin
‘f’ pin
1
8 (1)
9 (1)
18 (1)
26 (1)
19 (2)
20 (2)
2
7 (1)
16 (1)
17 (1)
25 (1)
10 (2)
11 (2)
Note: Remote 1: 26 way high density D-type socket. Frame ground is pin 2 and +5V
@500mA is
pin 1.
Remote 2: 26 way high density D-type plug. Frame ground is pin 6 and +5V @500mA is
pin 15.
3.4 Configuration
The AADA416FM is equipped with on-board jumper links for different maximum
operating levels. This enables the module to be matched to both +18dBu and
*+24/+28dBu.
There are also three jumper links, PL2, PL3 and PL4 provided to link audio channels
together to provide a variety of input/output configurations.
AADA416FM showing configuration jumpers
Note: *The maximum input signal level is +28dBu and the maximum possible output level is
+25dBu.
AADA416FM User Manual R1.8 13 18 January 2019

Crystal Vision Hardware installation
Linking audio channels together
Links PL2, PL3 and PL4 on the AADA416FM board allow audio channels 1 to 4 to be
configured in any of the following modes.
•
•channels – each channel is 1-in 4-out
•channels – channels 1 and 2 are 1-in 4-out; channel 3 is 1-in 8-out
•channels – channels 1 and 3 are 1-in 8-out
•channels – channel 1 is 1-in 4-out; channel 2 is 1-in 12-out
•1 channel – channel 1 is 1-in 16-out
The table on the next page shows the jumper positions required for each mode and the
implications for LEDs and gain adjust controls.
The link settings required for each mode are as follows:
Mode PL2 PL3 PL4 Comments
4 Channel
1,2,3,4>4
unlink
unlink
unlink
4 separate audio channels.
3 Channel
1,2>4
3>8
unlink
unlink
link
Only Audio 1, 2 and 3 inputs are used. Audio 4 outputs same
as Audio 3 outputs and uses Audio 3 input.
Audio 4 gain pot is out of circuit.
LED 4 conveys the same information as LED 3.
2 Channel
1,3>8 link unlink link
Only Audio 1 and 3 inputs are used. Audio 2 outputs same as
Audio 1 outputs and uses Audio1 input. Audio 4 outputs same
as Audio 3 outputs and uses Audio 3 input.
Audio 2 and audio 4 gain pots are out of circuit.
LED 2 conveys the same information as LED 1 and LED 4
conveys the same information as LED 3.
2 Channel
1>4
2>12
unlink link link
Only Audio 1 and 2 inputs are used. Audio 3 & 4 outputs same
as Audio 2 outputs and uses Audio 2 input.
Audio 3 & 4 gain pots are out of circuit.
LED 3 & 4 convey the same information as LED 2.
1 Channel
1>16
link link link
Only Audio 1 input is used. Audio 2,3 &4 outputs same as
Audio 1 outputs
Audio 2, 3 & 4 gain pots are out of circuit.
LED 2, 3 & 4 convey the same information as LED 1.
LED 2, 3 & 4 convey the same information as LED 1.
Note: Link corresponds to jumper in 1-2 position (nearest edge connector)
Unlink corresponds to jumper in 2-3 position (furthest from edge connector)
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Crystal Vision Hardware installation
AADA416FM showing channel combining links
Matching different operating levels
The maximum operating level may be adjusted for either +18dBu or +24dBu using on-
board links PL12-15 (input gain) and PL8-11 (output gain).
AADA416FM showing variable and jumper link gain controls
The following table shows the jumper links used for each channel and their default
positions for unity gain with +24dBu in and +24dBu out.
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Crystal Vision Hardware installation
Default +24dBu input/output settings
Input gain link position
Output gain link position
Audio 1
PL12: 1-2 (0dB gain)
PL8: 2-3 (0dB gain)
Audio 2
PL13: 1-2 (0dB gain)
PL9: 2-3 (0dB gain)
Audio 3
PL14: 1-2 (0dB gain)
PL10: 2-3 (0dB gain)
Audio 4
PL15: 1-2 (0dB gain)
PL11: 2-3 (0dB gain)
The following table shows the input/output levels for a range of typical operating levels
and the required settings for the input and output jumpers and variable gain adjust
controls:
Changing input/output levels
I/P level
O/P level
Input gain link
Output gain link
Gain
adjust
Audio
+24dBu
+24dBu
PL12-15: 1-2 (0dB gain)
PL8-11: 2-3 (0dB gain)
0
Levels
+18dBu
+18dBu
PL12-15: 1-2 (0dB gain)
PL8-11: 2-3 (0dB gain)
0
+18dBu
+24dBu
PL12-15: 1-2 (0dB gain)
PL8-11: 1-2 (+6dB gain)
0
+24dBu
+18dBu
PL12-15: 2-3 (-6dB gain)
PL8-11: 2-3 (0dB gain)
0
+28dBu
+24dBu
PL12-15: 2-3 (-6dB gain)
PL8-11: 2-3 (0dB gain)
+2dB
+28dBu
+18dBu
PL12-15: 2-3 (-6dB gain)
PL8-11: 2-3 (0dB gain)
-4dB
Note: Moving only jumper links PL12 to PL15 from 1-2 position to 2-3 position will
reduce the
audio (input) gain by 6dB for Audio 1 to 4 respectively. Moving the jumper links
PL8 to PL11
from 2-3 position to 1-2 position will increase the audio (output) gain by 6dB for
Audio 1 to 4
respectively.
The maximum input signal level is +28dBu and the maximum possible output level is +25dBu.
Overvoltage LED inhibit
To inhibit LED indication of overvoltage, set PL6 in position 1-2. For both silence and
overvoltage indication set PL6 in position 2-3. To enable or inhibit the GPI warnings of
overvoltage and silence detection see section 3.3 – ‘General purpose interface’.
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Crystal Vision Hardware installation
Using the monitoring output
Two 3.5mm jacks labelled MON 1 and MON 2 are provided to monitor the output of the
distribution amplifier after any gain or channel combining settings.
The signal is scaled down so that the headphone sockets produces +6dBu for +24dBu at
the distribution amplifier output.
For MON 1 the tip of the 3.5mm jack is audio 2 and the ring is audio 1 and for MON 2
the tip of the 3.5mm jack is audio 4 and the ring is audio 3.
Other board links
Jumper, PL5, should always be in position 2-3.
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Crystal Vision Trouble shooting
4 Trouble shooting
The front edge of the card provides useful power rail monitoring, in addition to card edge
controls and two headphone monitoring outputs.
AADA416FM front edge view
The bottom green LED indicates good +/- 18 Volt power rails when lit and the upper
green LED indicates a good +5 Volt rail when lit.
The yellow LEDs illuminate to indicate either an output overvoltage error or channel
silence error. The top left-hand yellow LED is for channel 1, the lower left-hand yellow
LED is for channel 2. Similarly, the top right-hand yellow LED is for channel 3 and the
bottom right-hand yellow LED is for channel 4.
Overvoltage LED indication may be inhibited by changing the position of a jumper link,
as explained in the configuration section of the Installation chapter.
The headphone outputs are a useful way of checking the presence and quality of audio at
the output of the quad amplifier after all the gain adjustments and channel combining.
Caution: Take care when using headphone monitoring that high signal levels
are not present which could damage hearing.
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Crystal Vision Trouble shooting
Basic fault finding guide
The Power OK LEDs are not illuminated
Check that the frame PSU is functioning – refer to the appropriate frame manual for
detailed information
Check that the card is seated correctly in the frame
There is no audio output
Check that valid audio inputs are present and that any cabling is intact
Check that the inputs and output(s) used are valid for the combining link
positions in use Check that the input/output gain jumper links are fitted
correctly
The gain range is not as expected
The gain range and maximum output level are dependent on the position of the
jumper links as explained in the Installation chapter
Check that the input/output gain jumper links are fitted correctly
The card no longer responds to card edge control
Check that the card is seated correctly and that the Power OK
LEDs are lit If necessary re-set the card
Is it safe to ground either the positive or negative audio output for unbalanced operation?
Yes. This is safe. It is recommended to set the input gain to -6dB (using PL12-15) to
avoid output clipping when using unbalanced output connections. This is because
connecting one phase to ground increases the level on the other phase by +6dB
To avoid damage to driver outputs, do not connect both phases to ground
Re-setting the card
If required, the card may be reset by simply removing the rack power and re-applying
power after a few seconds or by removing the card from the rack and then re-inserting
the card
It is safe to re-insert the card whilst the rack is powered
AADA416FM User Manual R1.8 19 18 January 2019