BHI NES10-2 User manual

Page 1
bhi
NES10-2
NES-5
Noise Eliminating Speakers
Operating Manual
SOUND ENGINEERING SOLUTIONS
1030-103D Issue G 10/07
Page 32
SOUND ENGINEERING SOLUTIONS
bhi
email: [email protected]
www.bhi-ltd.co.uk
Tel:[phone]
Fax:[phone]
bhi Ltd
22 Woolven Close
Burgess Hill
West Sussex
RH15 9RR
England

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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
· Asampleofthisproducthasbeentestedandfoundtoconform
to the following European Directives:
73/23/EEC – Low Voltage (safety) Directive
89/336/EEC – EMC Directive
7. Approvals

Page 3
Copyright
Thispublication,includingallphotographsandillustrations
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.
Important Information
Page 30
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 4. 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)
√ Detailsofwhenandwhereyoupurchasedthenoiseeliminating
speaker
√ Your address
Most queries can be sorted out over the telephone, if not we will
arrange withyou to haveyour speakersent back tous 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
Ifyou haveany suggestionsforimprovements pleasecompete and
return the customer feedback form.

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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 Specication
2.4 Connection
2.5 Setup
3. NES-5
3.1 Connections
3.2 Description
3.3 Specication
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
Pocket Reference Books
Havealltheimportantinformationatyourngertips.Available
for the following
Yaesu:
FT-817
VX-2R
VX-5R
VX-6R
VX-7R

Page 5
1.1 bhi
bhi Ltdare specialistsin thedesign, developmentand 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 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 NES-5 enable the user to listen and concentrate
“stress-free”.
Suitableapplicationswherethespeakerswillbeofgreatbenet
totheuserincluderadioamateurbasestations,CBradios,two-way
radios,HFradios,marinecommunications,scanners,taxibasesta-
tions and hands-free car kits.
The NES10-2 and NES-5 are compact and easy to install. They
incorporate DSP technology 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NES-5isaplugandgomodelwhichhasaxedlevelofnoise
cancellation.
1. Overview
Page 28
Noise Cancelling Headphones (NOT DSP)
Order code:NCH
Theheadphonesemploymicrophonestomoni-
tor the ambient noise. These microphones are
wiredoutofphaseandfeedadifferentialamplier
whichgeneratesanopposing signalto thatofthe
unwanted noise.This signal thencancels outthe
unwanted background noise.
Theseactivenoisereduction(ANR)headphonesreducetheambientback-
ground noise to allow you to listen to the program 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 holderAAAsize.
(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 sup-
pliedwithanaircraftadapter,
so youcan nowlistentothe
lm,orCDplayerwithoutall
the jet engine noise.
Theheadphones effectively removenoisesuchasblowernoise,ambient
noise, jet engine noise or music from another room.
Features:
Free aircraft
adapter and carry
bag

Page 6
The speakers mount like any standard external speaker and are
powered by any 12 – 24 vdc unregulated power source. You can
use the optional bhi external power supply or in-vehicle adapter.
TheNES10-2and NES-5comeasstandardwith a2maudiolead
terminated with a 3.5mm mono jack plug ready for immediate use.
1.3 Audio DSP Noise cancellation.
ThebhiDSPprocessestheincomingaudiosignalandthendifferenti-
atesthespeechfromthenoise. Theunwantednoiseandinterference
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
NEDSP1062 Amplied DSP mod-
ules.
These are as the NEDSP1061 modules,
except they feature an integral 2.5W rms
poweramplier.Theyareideallysuited
fortting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
The Radio Mate compact keypad for the Yaesu
FT817, FT857 and FT897 enables the
user to get the best out of their radio.
It has been designed to make many
of the common functions quick and
easy to use. The keypad does this with a
number of fast, effective shortcuts.
Radiomate.
DSP Noise Cancelling as Easy
as 1-2-3
1 - Plug inAudio
2 - Connect Loudspeaker
3 - Connect Power
Giving You..........
Noise Free Listening
ANEM “Noise Away”

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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xing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:
 Allows 6 pieces of equipment to
be connected to a Noise Eliminating Speaker,
In-line Module or existing extension speaker
 3 Inputs - loaded at 8 ohms
 3 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
The NEDSP1061 modules again feature the bhi noise
reduction DSP. It’s small size allows it to be retro
ttedintoexistingequipment,ordesignedinto
new equipment.
The module is 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 into the equipment. The
ttingkitincludesamountingbracket,keyboardlabelandadetailedinstal-
lation manual.
NEDSP1061 modules

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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 technology 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
Astand 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. ThenoisecancellationlevelDIPswitchallowstheuserto
selectone1 of8differentsettings,level1 givingtheleast
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
(sse page 14 for more information).
2. Thepower-in socketallowstheuser toconnectNES10-2
tothebhipowersupply(optionalextra)oranysuitable12
–24Vdcpowersource(min500mA),withasuitable2.1mm
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
electronicsoftheNES10-2,andisadjusteddependingon
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.
Page 24
Adaptors for connecting NES10-2 to equipment
Adaptors for connecting ear/headphones to
NES10-2
Radio connector Adaptor required Order
Number
6.35mm (1/4”) mono
socket 6.35mm mono plug - 3.5mm mono socket ADP-P001
Headphone con-
nector Adaptor required Order
number
3.5mm jack
mono plug None N/A

Page 10
Once set the controls do not normally require any further
adjustments.
5. LED indicator. The LED illuminates red when power is
appliedandchangestogreenwhenthenoisecancellation
is active.
LED
Colour Off Red Green
Description Power
off/audio
bypassed
Power on
noise cancel-
lation off
Power on
noise cancel-
lation on
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. Power switch/audio bypass.
Thisswitchremovesthepowertothespeaker.Byturning
the power off, the audio bypasses the DSPcircuit, and is
connected directly to the speaker. The speaker will then
act as a normal extension speaker
8. Headphonesocket.Thisallowstheusertolisteninprivate
using a standard mono earpiece or stereo headphones
using one of the optional audio adaptors (see section 5)
.Thissocketcan alsodriveanotherloudspeaker. Whena
connector isinserted intothis socket theinternal speaker
is muted.
Page 23
Optional Extras
The followingitemsare availablefrom bhias optionalextras. If you
would like to order any of these items then please contact us ( see
the backpage ofthis document forcontact details), ororder 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 Specication
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
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,tthe
speakerinasuitablelocationusingthebracketandxingscrews
supplied. Ensure the bracket does not foul the power switch.
Note: It is recommended that this is carried out by a
qualied 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 theNES10-2 issetto yourpersonalsettings nofurther
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
thebackground maysoundalittle strange.Thisisnormal 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 con-
nector
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.
Iftheproblemiscured,tryremovingthepreviousferrite(s).Shorten-
ing 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 removing 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rstferrite.

Page 13
2.5 NES10-2 basic set-up procedure
and
operation
1. Connectthebhipowersupplyor asuitable12to24Vdcpower
supply to the power socket at the back of the NES10-2.
Note: Makesure thecentre poleof your powersup-
ply 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. Turnthe sensitivitycontrol fullyanticlockwise,and thenback a
quarter of a turn.
4. Connect the audio lead to your external speaker socket using
the2maudioleadwith3.5mmjackplug. Ifyourexternalspeaker
socketisnota3.5mmjacksocket,thenaudioleadadaptersare
availablefrom bhi. A2 metreaudio extensionleadis available
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 correct
switch setting. Note: Switch 4 is NOT used.
Page 20
Operators voice can be heard when transmitting.
All bhi products operate correctly under normal working condi-
tions. However if problems with feedback 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t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
thespeakerandcausingdistortion. Adjustthesensitivitycontrol
knobonthetopofthespeakerifrequiredtoobtainyouroptimum
setting.
7. Tune into the station or channel you require.
8. Turnthenoisecancellingon,thefrontpanelLEDchangesfrom
red to green indicating the noise cancellation is active.
9. Adjustthelterlevelsettingifrequiredtoremovehigherlevels
of noise and improve the intelligibility and clarity of the signal.
Note:
The switches may
be adjusted using
a blunt implement
such as ballpoint
pen.
1WS 2WS 3WS leveL noitaunettA
NO NO NO 1 Bd9
NO NO FFO 2 Bd11
NO FFO NO 3 Bd31
NO FFO FFO 4 Bd51
FFO NO NO 5 Bd71
FFO NO FFO 6 Bd02
FFO FFO NO 7 Bd42
FFO FFO FFO 8 Bd53
Page 19
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:
The speakers 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.
bhihaveanotherproductthatwillworkwiththeselevelsofsignal
, the NEIM1031 (Noise eliminating In-line Module). Please
contactbhi formore information.See endof operatingmanual
for contact information.
Sometimes there is a short delay before the noise
cancellation is active.
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.

Page 15
3.1 NES-5 Connections
14.2000
000
14.195.00
145.0
Optional In-vehicle power lead
Optional Mains
PowerAdaptor
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:
Check that the power connector on your power supply is
suitable for the power socket on the speaker (2.1mm, centre
positive).
Checkthatyouhaveswitchedyourradiocommunicationequip-
menton andthatyouhavea signalforthespeaker toprocess.
To verify this, remove the audio connector from the external
speaker socket on your equipment.
Check that the LED on the front of the speaker is illuminated
green, when the noise cancellation is on (NES10-2 only).
Thespeakerworksbutthenoisecancellationdoesn’t
appear to improve the audio quality of the signal:
Check thatthe LEDon thefront ofthe NES10-2 changesfrom
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 the external speaker
socket or earphone socket of your equipment.
3.3 Specication
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 us-
ing 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 NES-5 (see
section 5).
3. Switch on and the NES5 will automatically remove unwanted
noise and interference.