BHI NES10-2 User manual

Page 1
bhi
NES10-2
NES-5
Noise Eliminating Speakers
Operating Manual
SOUND ENGINEERING SOLUTIONS
1030-103D Issue F 02/04
Page 32
SOUND ENGINEERING SOLUTIONS
bhi
email: [email protected]
[email protected]
www.bhi-ltd.co.uk
www.wonderwand.co.uk
www.bannerbadges.co.uk
Tel:[phone]
Fax:[phone]
bhi Ltd
PO Box 136
Bexhill on Sea
East Sussex
TN39 3WD

Page 2
Note:
No user serviceable parts inside. Warrany void if
speaker opened.
When listening using headphones, care must be taken
when switching the noise cancellation off, as high
volumes of noise will be present.
Prolonged exposure to high sound levels may lead to
hearing damage.
bhi accept no responsibility to damage to hearing
through incorrect operation of this equipment.
Page 31
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
7. Approvals

Page 3
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
fitnessforanyparticularpurpose. 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.
Important Information
Page 30
Everynoise-eliminatingspeakercomeswitha 12 month
guaranteeagainstdefectivematerialsandworkmanship.
If you do have a problem then please refer to the
troubleshootingsection4. 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)
√Detailsofwhenand 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.
6. bhi support
If you have any suggestions for improvements please
compete and return the customer feedback form.

Page 4
1 Overview
1.1 bhi
1.2 Introduction
1.3 Audio DSP Noise cancellation
1.4 Unpacking
2 NES10-2
2.1 Controls
2.2 Description
2.3 Specification
2.4 Connection
2.5 Setup
3. NES-5
3.1 Connections
3.2 Description
3.3 Specification
3.4 Setup
4.Troubleshooting
5. Accessories
6. bhi Support
7. Approvals
Page
5
5
6
7
8
9
11
11
13
15
16
17
17
18
23
30
31
Table of Contents
Page 29
Wonder Wand
Order code:WWAND
Rig mounted QRP antenna
providing near all band
coverage from 40M to 70cm
Tuneable Counter poise
Order code:TCS
Tuneable counter poise for use
with Wonder Wand and other
QRP antennas.
Mini-Paddle
Order code: MP-817
Small sized twin paddle to be
used with the FT-817 and all
other transceivers that have
built in keyer circuits.
The Code Cube:
Order code: Code Cube
Mini-Paddle and Code Cube
Keyer=World’ssmallestKeyer/
Paddle.
FT-817 Mounting stand.
Order code: FT-Stand
Simply clicks into position.
Adjustable with non slip feet.
Pocket Reference Books
Have all the important information at your finger
tips. Available for the following Yaesu FT-
817,VX-5R and VX-7R

Page 5
1.1 bhi
bhi Ltd are specialists in the design, development and
manufacture of Digital Signal Processing (DSP) 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 communica-
tions. 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 NES-5 enable the user to listen and con-
centrate “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 NES-5 are compact and easy to
install. They incorporate DSP technology and are fully
adaptivetoany change in noise levels andinterference.
On the NES10-2 the noise cancelling can be switched
on or off and there are 8 user selectable noise cancel-
lation levels, whilst the NES-5 is a plug and go model
which has a fixed level of noise cancellation.
1. Overview
Page 28
Noise Cancelling Headphones (NOT DSP)
Order code:NCH
Theheadphones employ microphones
to monitor the ambient noise. These mi-
crophones are wired out of phase and
feed a differential amplifier which gener-
ates an opposing signal to that of the un-
wanted noise. This signal then cancels
out the unwanted background noise.
These active noise reduction (ANR) headphones reduce the
ambient background noise to allow you to listen to the pro-
gram source peacefully.
§Lightweight, folding design
thats ideal for travelling.
§Ambient noise cancelling on/
off switch with LED
§Warning sirens and telephone
rings remain unaffected.
§Discrete battery holder AAA
size. (Battery included)
§30mm Neodymium drivers
§Supplied with carry pouch
§1.6M cable terminating in a
3.5mm jack plug plus 2 pin
aircraft adapter.
The headphones are
suppliedwithanaircraft
adapter, so you can
now listen to the film,
orCD player withoutall
the jet engine noise.
The headphones effectively remove noise such as blower
noise, ambient noise, jet engine noise or music from another
room.
Features:
Freeaircraft
adapterand
carrybag

Page 6
The speakers mount like any standard external
speaker and are powered by any 12 – 24 vdc unregu-
lated power source. You can use the optional bhi ex-
ternal power supply or in-vehicle adapter.
The NES10-2 and NES-5 come as standard with a
2m audio lead terminated with a 3.5mm mono jack plug
ready for immediate use.
1.3 Audio DSP Noise cancellation.
The bhi DSP processes the incoming audio signal and
then differentiates the speech from the noise. The un-
wanted noise and interference are then attenuated to
leave only the speech.
The following diagrams are taken from actual audio
signals and illustrate how the audio signal is being
processed.
Original signal.
Speech with a lot of
background noise
Speech Noise
Figure 1. Audio signal before processing.
Page 27
Yaesu FT817
Completekit to fit in
the Yaesu FT817.
Order code:
NEDSP1061-KBD-
FT817
Kenwood TS50
Completekit to fit in
theKenwoodTS50.
Order code:
NEDSP1061-KBD-
TS50
Generic
Complete generic
kit to fit most
applications.
Order code:
NEDSP1061-KBD
New versions available soon. Check our website for the lat-
est, or call for details.
NEDSP1062 Amplified DSP modules.
These are as the NEDSP1061 modules, except they feature
an integral 2.5W rms power amplifier. They are ideally suited
for fitting in the loudspeaker path of equipment, or indeed into
a loudspeaker. They feature single button operation with
selectable 4 or 8 levels of noise reduction.
Order code NEDSP1062-KBD
Headphones and Earpieces
Stereo Headphones
Order code: 1030-STHDP
Lightweight stereo head-
phones. Supplied with
3.5mm mono - 3.5mm stereo
adapter.
Mono Earpiece
Order code:1030-MOEP
Mono earpiece fitted with
3.5mm mono plug.

Page 7
For NES10-2 turn to page 8
For NES-5 turn to page 15
1.4 Unpacking
Check that the following items are included in the
package:
NES-5 Noise eliminating speaker
or
NES10-2 Noise eliminating speaker
2 fixing screws
4 self adhesive rubber feet
1 fused power lead
Customer feedback card
Optional extras if ordered (see section 5):
Processed speech.
Speech with reduced
noise
Figure 2. Audio signal after processing.
Page 26
Switch Box
Order code: 1042 Switch Box
Features:
nAllows 6 pieces of equipment to
be connected to a Noise Eliminating Speaker,
In-line Module or existing extension speaker
n3 Inputs - loaded at 8 ohms
n3 Un-loaded inputs (for low level signals)
Need to Connect more than one piece of equipment to your
bhi Noise Eliminating Speaker or module?
Switch box front view Switch box rear view
TheNEDSP1061modulesagainfeature
the bhi noise reduction DSP. It’s small
size allows it to be retro fitted into
existing equipment, or designed in to
new equipment.
Themoduleis single button operation.
It features visual and audible indication
of mode of operation.
The module can be software settable to 4 or 8 levels of noise
reduction. Four wires are provided to integrate the module
intothe equipment. Thefitting kit includes a mounting bracket,
keyboard label and a detailed installation manual.
Currently there are three versions of the module.
NEDSP1061 modules

Page 8
Serial No.
NES10-2 Noise Eliminating Speaker
Filter
Select
SW1 SW2 SW3 Level
On On On 1
On On Off 2
On Off On 3
On Off Off 4
Off On On 5
Off On Off 6
Off Off On 7
Off Off Off 8
On
Off
Audio Input
PO Box 136
Bexhill on Sea
East Sussex
TN39 3WD
England
Tel: + 44 (0)8702407258
DC Power
12-24V DC
Noise Cancellation
Off On Volume
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
Power/Audio
Bypass
Figure 3. NES10-2 Controls
bhi
Page 25
Other products avaialble from bhi.
In-line module.
Order code: NEIM1031
The NEIM1031 In-line module uses the same DSP technol-
ogy found in the NES10-2 and NES5 speakers, but has the
following additional features:
§Noise cancellation 9 - 35dB
§Audio input/output
§Line level input/output
§Output volume control
§Input level control with LED
§Power on/off with LED
§Input selector switch
§Noise cancellation On/off with LED
Accessories for the NEIM1031
20 Watt Extension
speaker
Order code:LSPKR
Teminated with 3.5mm
mono plug
NEIM1031 mounting Stand.
Order code: 1031-STA
A fully adjustable stand for the
NEIM1031.Holds the module in
the optimum postion.
Horizontal conversion label
Order code:1031-108D
This label changes the orientation of
the NEIM1031 to landscape

Page 9
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
thespeaker(sse page 14 for more information).
2. The power-in socket allows the user to con-
nectNES10-2to the bhi power supply (optional
extra)orany suitable 12 –24V dc powersource
(min500mA), with a suitable 2.1mm powercon-
nector, centre pin positive (fused at 3A).
3. 2 metre audio input lead terminated with a
3.5mm mono jack plug. This lead connects to
theexternal speaker socket or earphone socket
of your equipment.
4. Sensitivitycontrol. This controls the input level
to the electronics of the NES10-2, and is ad-
justed depending on the input level from the
radio communication equipment being used.
The optimum level is a combination of the out-
putfrom the equipment and the sensitivity level
of the NES10-2, so that there is no distortion
and the speaker is not being overdriven.
Page 24
Adaptors for connecting NES10-2 to equipment
Adaptors for connecting ear/headphones to
NES10-2
oidaR rotcennoc deriuqerrotpadArebmuNredrO
)"4/1(mm53.6 tekcosonom tekcosonommm5.3-gulponommm53.6100P-PDA
)"4/1(mm53.6 tekcosoeretS tekcosonommm5.3-gulpoeretSmm53.6200P-PDA
kcaJmm5.3 tekcosoeretS tekcosonommm5.3-gulpoeretSmm5.3300P-PDA
kcaJmm5.3 tekcosonoM enoNA/N
tekcosonohPtekcosonommm5.3-gulponohp400P-PDA
onommm5.2 tekcos tekcosonommm5.3-gulponommm5.2500P-PDA
oeretSmm5.2 tekcos tekcosoeretsmm5.3-gulpoeretSmm5.2 )300P-PDAhtiwnoitcnujnocniesu( 600P-PDA
enohpdaeH rotcennoc deriuqerrotpadA rebmunredrO
kcajmm5.3 gulponom enoNA/N
kcaJmm5.3 gulpoeretS gulponommm5.3-tekcosoeretsmm5.3100S-PDA
)"4/1(mm53.6 gulponoM gulponommm5.3-tekcosonommm53.6200S-PDA
)"4/1(mm53.6 gulpoeretS gulponommm5.3-tekcosoeretsmm53.6300S-PDA
oeretSmm5.2 gulp gulponommm5.3-tekcosoeretSmm5.2400S-PDA
onommm5.2 gulp gulponommm5.3-tekcosonommm5.2500S-PDA

Page 10
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.
DEL ruoloC ffOdeRneerG
noitpircseD fforewoP oidua dessapyb
norewoP esioN ffonoitallecnac norewoP esioN nonoitallecnac
6. NoisecancellationON/OFF switch. This switch
turns the noise cancellation on and off, and
should be in the “OFF” position prior to using
the speaker.
7. Power switch/audio bypass.
This switch removes the power to the speaker .
By turning the power off, the audio bypasses
the DSP circuit, and is connected directly to the
speaker. The speaker will then act as a normal
extension speaker
8. Headphone socket.Thisallowsthe usertolisten
in private using a standard mono earpiece or
stereo headphones using one of the optional
audio adaptors (see section 5) . This socket
can also drive another loudspeaker. When a
connectoris inserted into this socket theinternal
speaker is muted. Page 23
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), or order on-line at
www.bhi-ltd.co.uk.
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
Audio:
1030-EXLE Audio Extension lead (2M)
ALD-001 3.5mm - 3.5 mm mono audio lead
1.2M long.
ALD-002 3.5mm - 3.5mm mono audio lead
2.5M long.
ALD-003 Phono - phono lead mono lead
1.2M long.
ALD-004 3.5mm Stereo - 2 x phono lead
1.2M long.
Audio Adaptors:
See tables on following page for details.
5. Accessories

Page 11
2.3 Specification
Noise attenuation - 9 - 35dB
Number of attenuation levels - 8
Tone reduction - 4 -65dB
Audio input power - 5W rms max
Audio output power - 2.5W rms max
Audio connection - 3.5mm mono jack
plug, 2m lead.
Headphone connection -3.5mm mono jack
socket
DC power - 12-24V dc. 500mA
Size - 110 x 65 x 55mm
Weight - 200gms
2.4 NES10-2 basic connection diagram
For use with standard radio communication equipment,
follow the diagrams and procedures on page 12. For in
vehicle use, fit the speaker in a suitable location using
the bracket and fixing screws supplied. Ensure the
bracket does not foul the power switch.
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.
Page 22
See FAQs on our website for further information.
What is the fourth DIP switch for?
Nothing, it is reserved for future expansion.
What adjustments do I need to make during use?
None. Once the NES10-2 is set to your personal set-
tings no further adjustments should be necessary.
Can the speakers be used with a switch mode
power supply?
No. The speakers shouldbe used with linear
suppplies.
Sometimes I can hear watery noises.
When listening to high levels of noise, on high levels of
processing the background may sound a little strange.
This is normal operation as the DSP is removing the
high levels of noise.

Page 12
Serial No.
NES10-2 Noise Eliminating Speaker
Filter
Select
SW1 SW2 SW3 Level
On On On 1
On On Off 2
On Off On 3
On Off Off 4
Off On On 5
Off On Off 6
Off Off On 7
Off Off Off 8
On
Off
Audio Input
PO Box 136
Bexhill on Sea
East Sussex
TN39 3WD
England
Tel: + 44 (0)8702407258
DC Power
12-24V DC
Figure 4. NES10-2 connections
2.1mm power
connector
centre +Ve
14.2000
000
14.195.00
145.0
For adaptors see section 5
Optional Mains
Power Adaptor
Optional In-vehicle
power lead
Rubber feet
x 4 Fixing Screws
x2
bhi
Page 21
Try transmitting again. If the problem persists , then
move to the next step.
If the problem is cured, try removing the previous
ferrite(s). Shortening the power lead may also improve
the situation.
Figure 8. Power lead suppression.
Fit another ferrite at the other end of the
power lead
Try transmitting again, if the problem is cured, try re-
moving the previous ferrite(s).
Figure 9. Additional power lead suppression.
Try transmitting again. If the problem persists , then
move onto the next step.
If the problem is cured, try removing the first ferrite.

Page 13
2.5 NES10-2 basic set-up procedure and
operation
1. Connect the bhi power supply or a suitable 12 to 24
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 positive (+ve).
Switch the power switch on.
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. Ifyourexternalspeakersocketisnota3.5mm
jack socket, then audio lead adapters are available
from bhi. A 2 metre audio extension lead is avail-
able if your equipment is more than 2m away from
the NES10-2. (see section 5)
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
correctswitch setting. Note: Switch 4 is NOT used.
Page 20
Operators voice can be heard when transmitting.
All bhi products operate correctly under normal
working conditions. However if problems with feed-
back are experienced during transmisison then the
following measures may help.
1. Reduce the sensitivity control (NES10-2 only)
2. Connect the speaker to a separate power
supply (available from bhi - see section 5).
3. Ferrites Wind as many turns as
possible around the ferrite
Audio Lead
If problem persist then fit another ferrite at the other
end of the lead close to the audio connector
Figure 6. Audio lead
Figure 7. Audio lead
1” (25mm)
ferrite ring

Page 14
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.
Note:
The switches
maybe adjusted
usingabluntim-
plementsuchas
ballpoint pen.
1WS 2WS 3WS leveL noitaunettA
NONONO1 Bd9
NONOFFO 2 Bd11
NOFFONO3 Bd31
NOFFOFFO 4 Bd51
FFONONO5 Bd71
FFONOFFO 6 Bd02
FFOFFONO7 Bd42
FFOFFOFFO 8 Bd53
Page 19
nWith the noise cancellation switch in the offposition,
make sure that you have the sensitivity control on
theNES10-2fullycounter clockwise or thereabouts.
Now tune your radio communications equipment
untilyouhavea good clear signal with good volume.
The volume from the speaker is low and cannot be
increased:
nThespeakers are 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 speakers
electronics to process the signal effectively.
bhi have another product that will work with these
levels of signal , the NEIM1031 (Noise eliminating
In-line Module). Please contact bhi for more
information.See end ofoperatingmanual for contact
information.
Sometimes there is a short delay before the noise
cancellation is active.
nThis 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.

Page 15
3.1 NES-5 Connections
14.2000
000
14.195.00
145.0
Optional In-vehicle
power lead Optional Mains
Power Adaptor
3. NES-5
3.5mm Jack
plug
Figure 5. NES-5 connection detail
For adaptors see
section 5
Rubber feet
x 4 Fixing Screws
x2
Page 18
Speaker doesn’t work at all, no sound from the
speaker:
nCheckthatthepower connector on your power sup-
ply is suitable for the power socket on the speaker
(2.1mm, centre positive).
nCheck that you have switched your radio communi-
cation 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.
nCheck that the LED on the front of the speaker is
illuminated green, when the noise cancellation is
on (NES10-2 only).
The speaker works but the noise cancellation
doesn’t appear to improve the audio quality of the
signal:
nCheck that the LED on the front of the NES10-2
changes from red to green when the noise
cancellation is switched off and on (NES10-2 only).
Now switch the noise cancellation on, you should
clearly hear the difference now.
4. Troubleshooting/FAQs

Page 16
3.2 Description
1. The power-in socket allows the user to switch
on the NES-5 by using the bhi power supply
(optional extra) or a suitable 12 –24V 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
theexternal speaker socket or earphone socket
of your equipment.
3.3 Specification
Noise attenuation - 20 dB
Tone reduction - 20 dB
Audio input power - 5W rms max
Audio output power - 2.5W rms max
Audio connection - 3.5mm mono jack
plug, 2m lead.
DC power - 12-24V dc. 500mA
Size - 110 x 65 x 55mm
Weight - 200gms
Page 17
3.4 NES-5 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 NES-5.
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. Ifyour 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 exten-
sion lead is available, If your equipment is more
than 2m away from the NES-5 (see section 5).
3. Switch on and the NES5 will automatically remove
unwanted noise and interference.