KGP-2A/2B
6
Connecting a Separate Microphone for
Emergency Mode (KGP-2A only)
If you apply the modification as described below, you
can connect a separate microphone to the KGP-2A in place
of the transceiver’s microphone for Emergency mode. The
base station application software which can send out a cor-
responding command is required for the change of a micro-
phone which operates in the time of emergency transmis-
sion.
■
Modifi cation
1. Remove R171 (0
Ω
).
2. Remove R172 (0
Ω
).
3. Add 0
Ω
(RK73GB2A000J) to the $R17 location.
4. Add 0
Ω
(RK73GB2A000J) to the $R18 location.
J1
ACC3
11
1
Add
Remove
5
6
10
15
$R17
$R18
R171
R172
CONTROL UNIT
(X53-3980-20)
Component side view
J1 (ACC3) Pin 5 : Microphone input
J1 (ACC3) Pin 6 : Microphone ground (GND)
MODIFICATION
Since 5V DC goes through R55 (56k
Ω
) and then it is sup-
plied to the microphone input, an electric condenser-type
microphone can be connected to this terminal.
You can also adjust the microphone sensitivity by chang-
ing the R206 (560
Ω
) constant between 330
Ω
and approxi-
mately 1k
Ω
. The microphone pre-emphasis and IDC are
carried out by the DSP IC (IC29).
Modifi cation Setting for DGPS (KGP-2A only)
Input method of
DGPS signal
$R192
(0
Ω
)
R186
(0
Ω
)
$R184
(0
Ω
)
$R185
(0
Ω
)
R191
(0
Ω
)
5V input from ACC2
Yes
No
Yes
No
No
RS-232C level input
from ACC2
Yes
No
Yes
No
Yes
5V input from ACC3
Yes
No
No
Yes
No
RS-232C level input
from ACC3
Yes
No
No
Yes
Yes
Input method of
DGPS signal
$R190
(0
Ω
)
$R221
(0
Ω
)
R162
(0
Ω
)
R169
(0
Ω
)
5V input from ACC2
No
No
No
N/A
RS-232C level input
from ACC2
Yes
Yes
No
N/A
5V input from ACC3
No
No
N/A
No
RS-232C level input
from ACC3
Yes
Yes
N/A
No
R162
R169
$R190
$R221
R186
$R184
$R185
R191
$R192
CONTROL UNIT (X53-3980-20)
Component side view
