Connect Third Party Options; Voice Scrambler Board; Sc20-460 Board - Kenwood TK-2180 Modification Information

3 CONNECT THIRD PARTY OPTIONS

3.1

Voice Scrambler Board

You can install the optional board, such as a Voice
Scrambler board, to the transceiver. This section
describes how to install the TRANSCRYPT SC20-460 to
the transceiver.
Refer to the following URL or TRANSCRYPT for the
product details.
http://www.intepla.com/transcrypt/Pages/Two-way/
460.html
!
Items Required to Install
• Transceiver
• SC20-460
• Cushion Tape
• Protective cloth (N9440B, with an adhesive tape on
one side)
CAUTION
YOU MUST TURN THE TRANSCEIVER OFF AND REMOVE
THE POWER CABLE BEFORE CONNECTING THE OPTION
TO THE TRANSCEIVER.

3.1.1 SC20-460 Board

1. Prepare the SC20-460 board.
2. To modify the SC20-460 board and change the RX
Audio Input method.
In the normal Voice Scrambler board, the transceiver
enters the RX audio signals before de-emphasizing
the signal.
However, the transceiver enters the RX audio signals
after de-emphasizing the signal, so that you must
modify the Voice Scrambler board.
• Cut the foil between E52 and E53.
• Solder the position between E51 and E52 to
connect them.
Version: 1.13 USA
• Solder the position between E53 and E54.
Note:
# The required modification must be performed to avoid
symptoms, such as low level-audio signals from the
speaker, or too loud and distorted voice.
# Refer to the instruction manual supplied with the Voice
Scrambler for details.
3. Change the constant in conjunction with the TX/RX
audio level.
• Replace the R1 with the part with 100kohm and R3
with the part with 100kohm in conjunction with the
RX audio level.
• Replace the R2 with the part with 6.8kohm and R4
with the part with 6.8kohm in conjunction with the
TX audio level.
Before Modification
R1, R3: 100kohm
(The SC20-460 board default)
R2, R4: 100kohm
(The the SC20-460 board default)
Note:
# The required modification must be performed to avoid
symptoms, such as low-level audio signals from the
speaker, or too loud and distorted voice.
# Refer to the instruction manual supplied with the Voice
Scrambler for details.
Modification Information
After
Default Modification
E51 E51
E52 E52
E53 E53
E54 E54
After Modification
R1, R3: 100kohm
(No modification)
R2, R4: 6.8kohm
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