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KGP-2A/2B
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 (0Ω).
2. Remove R172 (0Ω).
3. Add 0Ω (RK73GB2A000J) to the $R17 location.
4. Add 0Ω (RK73GB2A000J) to the $R18 location.
J1 (ACC3) Pin 5 : Microphone input
J1 (ACC3) Pin 6 : Microphone ground (GND)
6
MODIFICATION
CONTROL UNIT
(X53-3980-20)
Component side view
J1
ACC3
11
15
6
10
1
5
Add
Remove
Since 5V DC goes through R55 (56kΩ) 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 (560Ω) constant between 330Ω and approxi-
mately 1kΩ. 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
$R192
DGPS signal
(0Ω)
5V input from ACC2
Yes
RS-232C level input
Yes
from ACC2
5V input from ACC3
Yes
RS-232C level input
Yes
from ACC3
Input method of
$R190
DGPS signal
(0Ω)
5V input from ACC2
No
RS-232C level input
Yes
from ACC2
5V input from ACC3
No
RS-232C level input
Yes
from ACC3
CONTROL UNIT (X53-3980-20)
Component side view
R186
$R184
$R185
R191
(0Ω)
(0Ω)
(0Ω)
(0Ω)
No
Yes
No
No
No
Yes
No
Yes
No
No
Yes
No
No
No
Yes
Yes
$R221
R162
R169
(0Ω)
(0Ω)
(0Ω)
No
No
N/A
Yes
No
N/A
No
N/A
No
Yes
N/A
No
$R221
$R190
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