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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
