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bhi
NES10-2
NESCB
Noise Eliminating Speakers
Operating Manual
SOUND ENGINEERING SOLUTIONS
1030-103D Issue D 09/02
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Important Information
Copyright
This publication, including all photographs and
illustrations is protected under international
copyright laws, with all rights reserved. Neither
this manual, nor any of the material within, may
be copied or reproduced without the written
consent of bhi Ltd.
Disclaimer
The information in this document is subject to
change without notice. bhi Ltd makes no
representations or warranties with respect to
the contents hereof and specifically disclaims
any implied warranties of merchantability or
fitness for any particular purpose. Furthermore,
bhi Ltd reserves the right to revise this
publication and to make changes from time to
time in the content hereof without obligation of
bhi Ltd to notify any person of such revision or
changes.
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1.1 bhi
bhi Ltd are specialists in the design, development and
manufacture of noise cancelling products and other
specialist electronics.
1.2 Introduction
The bhi noise eliminating speakers greatly improve the
clarity and intelligibility of speech in radio
communications. They are suitable for use in many
applications where high background noise and
interference mean that you cannot clearly hear what is
being said. The NES10-2 and NESCB enable the user
to listen and concentrate “stress-free”.
Suitable applications where the speakers will be of great
benefit to the user include radio amateur base stations,
CB radios, two-way radios, HF radios, marine
communications, scanners, taxi base stations and
hands-free car kits.
The NES10-2 and NESCB are compact and easy to
install. They incorporate new Digital Signal Processing
technology (DSP) and are fully adaptive to any change
in noise levels and interference.
On the NES10-2 the noise cancelling can be switched
on or off and there are 8 user selectable noise
cancellation levels, whilst the NESCB is a plug and go
model which has a fixed level of noise cancellation.
1. Overview
Table of Contents
1 Overview
1.1 bhi
1.2 Introduction
1.3 Unpacking
2 NES10-2
2.1 Controls
2.2 Description
2.3 Specification
2.4 Connection
2.5 Setup
2.6 Troubleshooting
3. NESCB
3.1 Connections
3.2 Description
3.3 Specification
3.4 Setup
3.5 Troubleshooting
4. Accessories
5. bhi Support
6. Approvals
Page
5
5
6
7
8
9
10
12
14
16
17
17
18
19
20
21
22
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DIP Switch
DC Power in Socket
centre pin +Ve
Sensitivity
Control
Noise Cancellation
On/Off Switch
Noise Cancellation Selection Table
Audio Input
Lead
2.1 Controls
2. NES10-2
LED
Headphone
socket
The speakers mount like any standard external speaker
and are powered by any 12 – 28 vdc unregulated power
source. You can use the optional bhi external power
supply or in-vehicle adapter.
The NES10-2 and NESCB come as standard with a 2m
audio lead terminated with a 3.5mm mono jack plug
ready for immediate use.
For NES10-2 turn to page 7
For NESCB turn to page 16
1.3 Unpacking
Check that the following items are included in the
package:
NESCB Noise eliminating speaker
or
NES10-2 Noise eliminating speaker
2 fixing screws
4 self adhesive rubber feet
Customer feedback card
Optional extras if ordered (see section 4):
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Once set the controls do not normally require
any further adjustments.
5. LED indicator. The LED illuminates red when
power is applied and changes to green when
the noise cancellation is active.
6. Noise cancellation ON/OFF switch. This switch
turns the noise cancellation on and off, and
should be in the “OFF” position prior to using
the speaker.
7. Headphone socket. This allows the user to listen
in private using a standard mono earpiece or
stereo headphones using one of the optional
audio adaptors (see section 4) .
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2.3 Specification
Noise attenuation - 20 dB (typical)
Number of attenuation levels - 8
Audio input power - 5W rms max
Audio output power - 2.5W rms max
2.2 Description
1. The noise cancellation level DIP switch allows
the user to select one 1 of 8 different settings,
level 1 giving the least amount of noise
cancellation, level 8 providing the most. The
unit is factory set to level 6.
DIP switch settings are shown on the rear of
the speaker.
2. The power-in socket allows the user to switch
on the NES10-2 by using the bhi power supply
(optional extra) or a suitable 12 –28V dc power
source (min 500mA), with a suitable 2.1mm
power connector, centre pin positive (fused at
3A).
3. 2 metre audio input lead terminated with a
3.5mm mono jack plug. This lead connects to
the external speaker socket or earphone socket
of your equipment.
4. Sensitivity control . This controls the input level
to the electronics of the NES10-2, and is adjusted depending on the input level from the
radio communication equipment being used.
The optimum level is a combination of the output from the equipment and the sensitivity level
of the NES10-2, so that there is no distortion
and the speaker is not being overdriven.
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NES10-2 connections
2.1mm power connector
centre +Ve
14.2000
000
14.195.00
145.0
For adaptors see section 4
2.4 NES10-2 basic connection diagram
For use with standard radio communication equipment,
follow the diagrams and procedures on page 11. For
in vehicle use, fit the speaker in a suitable location
using the bracket and fixing screws supplied.
Note: It is recommended that this is carried out by a
qualified vehicle technician.
Also supplied are four rubber feet. These can be
attached to the bottom of the mounting plate to prevent
it from marking surfaces.
Audio connection - 3.5mm mono jack
plug, 2m lead.
Headphone connection -3.5mm mono jack
socket
DC power - 12-28V dc. 500mA
Size - 110 x 65 x 55mm
Weight - 200gms
Rubber feet
Screws
Optional Mains Power Adaptor
Optional In-vehicle power lead
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6. Turn the radio equipment on and set the audio
volume to your own personal taste, making sure
that you are not over driving the speaker and
causing distortion. Adjust the sensitivity control
knob on the top of the speaker if required to obtain
your optimum setting.
7. Tune into the station or channel you require.
8. Turn the noise cancelling on, the front panel LED
changes from red to green indicating the noise
cancellation is active.
9. Adjust the filter level setting if required to remove
higher levels of noise and improve the intelligibility
and clarity of the signal.
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NONONO
1
NONOFFO
2
NOFFONO
3
NOFFOFFO
4
FFONONO
5
FFONOFFO
6
FFOFFONO
7
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8
Note:
The switches may be
adjusted using a blunt
implement such as
ballpoint pen.
Minimum level
Maximium level
2.5 NES10-2 basic set-up procedure and
operation
1. Connect the bhi power supply or a suitable 12 to
28 Vdc power supply to the power socket at the
back of the NES10-2.
Note: Make sure the centre pole of your power
supply connector is connected to the positive rail
(+ve).
2. Switch the noise-cancelling switch off. The front
panel LED should be illuminated red.
3. Turn the sensitivity control fully anticlockwise, and
then back a quarter of a turn.
4. Connect the audio lead to your external speaker
socket using the 2m audio lead with 3.5mm jack
plug. If your external speaker socket is not a 3.5mm
jack socket, then audio lead adapters are available
from bhi. A 2 metre audio extension lead is
available if your equipment is more than 2m away
from the NES10-2.
5. Set the noise cancellation level DIP switch to
level 6 to start with using the table on the
following page or on the label on the rear of the
speaker for the correct switch setting. Note:
Switch 4 is NOT used.
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n With the noise cancellation switch in the off position,
make sure that you have the sensitivity control on
the NES10-2 fully counter clockwise or thereabouts.
Now tune your radio communications equipment
until you have a good clear signal with good volume.
The volume from the speaker is low and cannot be
increased:
n The NES10-2 is designed to work with the external
speaker sockets of radio communications
equipment, and although it will work with some
earphone and headphone sockets, there may be
occasions where the signal output from these types
of output sockets is not enough for the NES10-2
electronics to process the signal effectively.
bhi have another product that will work with these
sort of signal levels, the NEIM1031 (Noise
eliminating In-line Module). Please contact bhi for
more information. See end of operating manual for
contact information.
Sometimes there is a short delay before the noise
cancellation is active.
n This is due to the time the DSP takes to start
processing the signals. This gives the oppportunity
to check that the DSP is not taking out any detail
from the signal.
2.6 Troubleshooting/FAQs.
Speaker doesn’t work at all, no sound from the
speaker:
n Check that the power connector on your power
supply is suitable for the power socket on the
NES10-2 (2.1mm, centre positive).
n Check that you have switched your radio
communication equipment on and that you have a
signal for the speaker to process. To verify this,
remove the audio connector from the external
speaker socket on your equipment.
n Check that the LED on the front of the NES10-2 is
illuminated green, when the noise cancellation is
on.
The speaker works but the noise cancellation
doesn’t appear to improve the audio quality of the
signal:
n Check that the LED on the front of the NES10-2
changes from red to green when the noise
cancellation is switched off and on.
Now switch the noise cancellation on, you should
clearly hear the difference now.
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3.2 Description
1. The power-in socket allows the user to switch
on the NESCB by using the bhi power supply
(optional extra) or a suitable 12 –28V dc power
source (min 500mA), with a suitable 2.1mm
power connector, centre pin positive (fused at
3A).
2. 2 metre audio input lead terminated with a
3.5mm mono jack plug. This lead connects to
the external speaker socket or earphone socket
of your equipment.
3.3 Specification
Noise attenuation - 20 dB (typical)
Audio input power - 5W rms max
Audio output power - 2.5W rms max
Audio connection - 3.5mm mono jack
plug, 2m lead.
DC power - 12-28V dc. 500mA
Size - 110 x 65 x 55mm
Weight - 200gms
3.1 NESCB Connections
14.2000
000
14.195.00
145.0
For adaptors see section 5
Supplied In-vehicle power lead
Optional Mains Power Adaptor
3. NESCB
3.5mm Jack plug
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Sometimes there is a short delay before the noise
cancellation is active.
n This is due to the time the DSP takes to start
processing the signals. This gives the oppportunity
to check that the DSP is not taking out any detail
from the signal.
3.5 Troubleshooting
Speaker doesn’t work at all, no sound from the
speaker:
n Check that the power connector on your power
supply is suitable for the power socket on the
NESCB (2.1mm, centre positive).
n Check that you have switched your radio
communication equipment on and that you have a
signal for the speaker to process. To verify this,
remove the audio connector from the external
speaker socket on your equipment.
3.4 NESCB basic set-up procedure and
operation
1. Connect the supplied in vehicle power lead, bhi
power supply or a suitable power adaptor to the
power socket at the back of the NESCB.
Note: Make sure the centre pole of your power
supply connector is connected to the positive rail
(+ve).
2. Connect the audio lead to your external speaker
socket using the 2m audio lead with 3.5mm jack
plug. If your external speaker socket is not a 3.5mm
jack socket, then audio lead adapters are available
from bhi (see section 4). A 2 metre audio extension
lead is available, If your equipment is more than
2m away from the NESCB.
3. Switch on and the NESCB will automatically remove
unwanted noise and interference.
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Optional Extras
The following items are available from bhi as optional
extras. If you would like to order any of these items
then please contact us ( see the back page of this
document for contact details):
Power:
1030-UKPA UK mains power adapter
1030-EUPA European mains power adaptor
1030-VEPL Vehicle power adapter
1030-2WVA 2 Way vehicle power adaptor
1030-FPL 2M free power lead
Audio:
1030-EXLE Audio Extension lead (2M)
1030-MOEP Mono Earpiece
1030-STHDP Stereo headphones
Audio Adaptors:
See tables on following page for details.
Other types available on request.
4. Accessories
Adaptors for connecting NES10-2 to equipment
Adaptors for connecting ear/headphones to
NES10-2
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European conformity information
· A sample of this product has been tested and found
to conform to the following European Directives:
73/23/EEC – Low Voltage (safety) Directive
89/336/EEC – EMC Directive
6. Approvals
Every noise-eliminating speaker comes with a 12
month guarantee against defective materials and
workmanship.
If you do have a problem then please refer to the
troubleshooting section 2.6(NES10-2) or section
3.5(NESCB). If you have not resolved your problem
then please contact us.
Before you make your call please have the following to
hand:
√ Your serial number (found at the back of the
speaker)
√ Details of when and where you purchased the noise
eliminating speaker
√ Your address
Most queries can be sorted out over the telephone, if
not we will arrange with you to have your speaker sent
back to us for analysis, repair or replacement (if within
12 months from date of purchase, if outside the
guarantee period an estimate of the cost of repair will
be given).
For contact details please refer to back cover of this
manual.
5. bhi support
If you have any suggestions for improvements please
compete and return the customer feedback form.
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SOUND ENGINEERING SOLUTIONS
bhi
bhi Ltd
PO Box 136
Bexhill on Sea
East Sussex
TN39 3WD
email: info@bhinstrumentation.co.uk
sales@bhinstrumentation.co.uk
www.bhinstrumentation.co.uk
Sales Tel/Fax:+44 (0)1293 530147
General enquiries Tel:+44 (0)1424 736811
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