Yaesu NEDSP1061 User manual

Page 1
bhi
NEDSP1061 Noise Reduction Module
Yaesu FT-817 Version
Fitting Instructions
1061-104D
Issue B
Sound Engineering Solutions
bhi
All manuals and user guides at all-guides.com
all-guides.com

Page 2
The bhi NEDSP1061 noise reduction module is a fully integral solution for noise
reduction on the Yaesu FT-817.
Features:
n4 Levels of noise cancellation (up to 35dB)
nSingle Button operation
nVisual and audible indication of operation
nLow power consumption
nRetains the internal battery pack
nFully integral installation
nStores the last used filter level.
nAutomatic tone reduction (upto 65dB)
Specifications:
White noise reduction:
level 1 11dB Size:26 x 37mm
level 2 13dB
level 3 19dB Voltage 5 -15VDC
level 4 35dB
Tone reduction: level 1 5dB
level 2 8 dB
level 3 21dB
level 4 65dB
Current consumption: 45mA
The fitting of the bhi NEDSP1061 module involves the removal of small surface mount
components and the drilling out of the transceivers’ lid. This should only be carried out by
a qualified engineer. bhi accepts no responsibility for the fitting or installation of the
NEDSP1061moduleandarenotliableforanydamagetoequipmentcausedbyitsfitment.
All attempts have been made to ensure that this information is up to date. It is possible
that these instructions contain errors, or the equipment is slightly different to the one
used to compile this information. In all cases it is up to the installer to ensure that the
module is fitted correctly.
By installing this module you are doing so at your own risk.
2. Disclaimer
1. Introduction.
All manuals and user guides at all-guides.com

Page 3
This document should be read in conjunction with the relevant Yaesu FT-817 technical
supplement.
The bhi NEDSP1061 module is inserted into the audio path of the transceiver, at a point
before the volume control. To access this point it is necessary to remove the main unit.
Remove any fitted batteries or NiCad pack before commencing installation.
Remove the top and bottom covers.
Remove the 5 main unit fixing screws.
Disconnect all connections - apart from the front unit ribbon cable.
Hinge the main unit forward, over the front unit ribbon cable.
To place the module into the audio path it is necessary to remove the audio signal
coupling capacitor C1338.
The following diagram shows the position of the component.
Carefully remove the capacitor.
Connect the screened lead from the NEDSP1061 module as follows:
Red lead - to R1482 side of C1338 (audio in)
Blue lead to the other side of C1338 (audio out)
Screen to the grounded connection close to the capacitor.
See the following diagram for details.
3. Installation.
NEDSP1061
Q1094
R1268
15K C1460
100p
R1482
1K C1338
100n
Remove
R1317
100K
R1459
10K
-
+To
Volume
control
Red wire
Blue wire
Schematic detail. FT-817
All manuals and user guides at all-guides.com

Page 4
Screen
Blue wire
Red wire
NEDSP1061 screened lead connection detail
Q1084
Q1057
R1482
Lower side of main unit
Location of
C1338
on lower side
of main unit
Location of
Q1082 (TP1084)
on upper side of
main unit
All manuals and user guides at all-guides.com

Page 5
Replace the main unit PCB.
TheNEDSP1061screenedleadfitsinthecutout provided for the frontantennaconnector.
Replace the main unit, connections, and all screws except the front right hand screw.
Drill the holes for the lid, as per the drawing at the back of this document.
Using hot melt adhesive affix the small keyboard to the inside of the lid. Taking care to not
get adhesive on the upper surface of the lid, switch or LED.
Allow this to cure before continuing.
The NEDSP1061 can be affixed in two positions.
The preferred position is in the location of the optional filter. This provides the more
mechanically secure location. If the optional filter is (or is going to be) installed the module
can be installed along side the filter.
Solder the red (power) lead to the drain of Q1082 (TP1084).
Connect M3 ring tag (0V leads) using the right front screw.
Affix theNEDSP1061moduleusingthe supplied self adhesive pad in the chosen location.
See the following diagram.
Alternative location
for NEDSP1061
(mount DSP up)
Screened lead
Keyboard assembly
M3 ring tag
Power lead
NEDSP1061 pre-
ferred postition
(mount DSP down)
FT-817 speaker connector
Ensure these wires do not
foul the lid when fitted
Keep this area clear
for speaker
All manuals and user guides at all-guides.com

Page 6
The NEDSP has three adjustments:
•Input signal level
•Output signal level
•Beep volume
The input and output levels do not normally need to be adjusted (see troubleshooting
section). Rotating anticlockwise will increase the level.
The beep volume can be adjusted to suit the user. Rotating P3 anti clockwise will increase
the beep volume.
The beep can be disabled, by turning the volume control fully clockwise.
Ensure all connections are replaced.
Place the lid loosely over the FT-817.
Connect an antenna.
Switch on.
P2 - Input level
P3 - Beep
volume
P1 - Output level
NEDSP1061 controls
4. Adjustments
Detune the FT-817 to receive static.
Press and release the DSP button, the unit will beep to indicate
which filter level is selected ( 1 beep for level 1, 2 for level 2
etc.).
The led will also flash in green at the same time. The noise level
will now be reduced.
Repeat this for all 4 filter levels. (see the operating instructions
at the end of this document for more information).
Pressthe buttonagainand thenoisecancellation willbeswitched
off, and the LED illuminate red.
If theunitoperatescorrectlythenreplacethelid.Affix thesupplied
label over the switch and LED.
All manuals and user guides at all-guides.com
all-guides.com

Page 7
Problem:
The volume of the FT-817 can be increased up to a point - where it then starts to fall.
Cause:
Input level to the NEDSP1061 is too high and causing the DSP input circuit to clamp.
Reduce the signal input level using P2.
Problem:
Increasing the volume to the FT-817 creates distortion.
Cause:
Output level from the NEDSP1061 is over driving the FT-817 power amplifier.
Reduce the output level using P1.
Note:
When listening high noise/signal broadcasts it is possible for the DSP to create an
effect that resembles slight clipping. Always check clipping problems with a good quality
clean audio signal, such as an FM talk station.
5. Troubleshooting.
All manuals and user guides at all-guides.com

Page 8
bhi
NEDSP1061 Noise Reduction Module
Yaesu FT-817 Version
Operating Instructions
Sound Engineering Solutions
Features:
n4 Levels of noise cancellation (up to 35dB)
nSingle Button operation
nVisual and audible indication of operation
nLow power consumption
nRetains the internal battery pack
nFully integral installation
nStores the last used filter level.
nAutomatic tone reduction (upto 65dB)
1. Introduction.
The NEDSP1061 module features is a fully integral solution for noise reduction for the
FT-817.
2. Operation.
All functions of the NEDSP1061 are controlled by a single button.
•Single press turns the noise cancellation on/off.
•Holding down the button changes the DSP filter level.
The mode of operation is indicated both by a flashing LED and a beep.
The LED is illuminated red when the noise cancellation is off.
When the noise cancellation level is changed the LED will flash green to indicate which
level has been selected.
Simultaneously the DSP will beep to give audible indication of DSP level. This allows the
operator to change the DSP level without having to look at the LED to see which level has
been selected.
A short beep is emitted to acknowledge a button press.
The module will store the current DSP level, and will return to this level when the FT-817
is switched on.
3. Use.
Switch on the FT-817.
The LED will illuminate red to indicate the noise cancellation is off. The unit will flash/beep
to indicate the DSP filter level last used.
Noise cancellation on/off.
Press and release the button and the led will extinguish, and the noise cancellation will be
activated.
Changing the filter level.
Hold down the button. The led will flash the filter level, and if the button is held it will step
through all the levels. When the desired level has been reached release the button. This
new value will be stored in the modules’ memory.
All manuals and user guides at all-guides.com

Page 9
noitpircseD
noitaunettAesioNetihW
Bd111leveL Bd312leveL Bd913leveL Bd534leveL
noitcuderenoT
Bd51leveL Bd82leveL Bd123leveL Bd564leveL
egatloVcdV51-5
noitpmusnoctnerruCAm54
ezisBCPmm73x62
Sound Engineering Solutions
4. Demonstration mode.
The NEDSP1061 module features 2 preset demonstration modes. These demonstrate
the noise cancellation abilities of the NEDSP1061 module.
Demonstration 1:
Hold down the button and switch on the FT-817. After a short time the unit will emit a 2
tone beep. Release the button. The unit is now in demonstration mode 1.
The module will switch the noise cancellation on for 1.5 seconds, then off for 1.5 seconds.
It will then move onto the next level and repeat this continuously through all 4 levels.
Thismodeisparticularly effective whenthe FT-817is justreceivingstatic, asit demonstrates
the attenuation of white noise at all the levels.
Alternativelytune the FT-817 into agoodqualityFM speech broadcast. This demonstration
shows how little the DSP alters the speech, at any of the levels.
Demonstration 2:
Follow the procedure as above. Wait for the second 2 tone beep, then release the key.
In this mode the filter level is set to level 3.
The noise cancellation is switched on for 3 seconds, then off for 3 seconds. This loops
until the user aborts this mode.
This is a good demonstration for listening noisy SSB conversations showing the before
and after.
Exiting the demonstration mode.
Hold down the button until the 2 tone beep is heard. Release the button.
After a short delay the LED will flash indicating the stored level, as during the normal
switch on.
5. Notes about the noise reduction.
When using the module on level 4 the speech may sound slightly distorted when high
levels of noise are present.
6. Specifications.
All manuals and user guides at all-guides.com

Page 10
bhi Ltd
P.O.Box 136
Bexhill on Sea
East Sussex
TN39 3WD
email:[email protected] www.bhi-ltd.co.uk
Tel: [phone]
Fax: [phone]
All manuals and user guides at all-guides.com