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Replace the main unit PCB.

The NEDSP1061 screened lead fits in the cut out provided for the front antenna connector.

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 the NEDSP1061 module using the 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

Summary of Contents for NEDSP1061

Page 1: ...Page 1 bhi NEDSP1061 Noise Reduction Module Yaesu FT 817 Version Fitting Instructions 1061 104D Issue B Sound Engineering Solutions bhi ...

Page 2: ...dB 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 NEDSP1061 module and are not liable for any damage to equipment caused by its fitment All atte...

Page 3: ...ibbon 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 sid...

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 ...

Page 5: ...itions 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 the NEDSP1061 module using the supplied self adhesive ...

Page 6: ...17 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...

Page 7: ...ng 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 s...

Page 8: ...s 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 D...

Page 9: ...ontinuously through all 4 levels This mode is particularly effective when the FT 817 is just receiving static as it demonstrates the attenuation of white noise at all the levels Alternatively tune the FT 817 into a good quality FM 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 t...

Page 10: ...Page 10 bhi Ltd P O Box 136 Bexhill on Sea East Sussex TN39 3WD email sales bhi ltd co uk www bhi ltd co uk Tel 0870 240 7258 Fax 0870 2407259 ...

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