MODEM SETUP
2-6
001-3282-101/102
Figure 2-4 DIP SWITCH S101
2.3.2 DIP SWITCH S101
DIP switch S101 has been factory set for the “Normal / Conventional / Bell 202 Half-Duplex / Active
High Squelch / 103 Originate Mode / FSK / CTS= 240 ms” mode. The factory default setting for the RTS to CTS
time is set to the maximum delay for compatibility with a wide range of products. When used with DRL
synthesized radios (DL-3400 and JSLM
/RNet) a shorter delay time (30 ms) may be used. Refer to the tables
above and Figure 2-4 to change the delay times.
a.To access S101 and make other adjustments, remove the modem board from the housing by removing the
2 screws on the RS-232 connector, the corner screws from the opposite end of the housing, and the top cover
screw. Slide the modem board out.
b.Set the switches as indicated in the Tables above (0=Off, 1=On).
c.Re-install the modem board in the housing unless performing adjustments described in the following two
sections.
2.3.3 TRANSMIT OUTPUT LEVEL ADJUSTMENT
The transmit carrier level to the transceiver is factory preset for 400 mVrms. This is the input level
required by a DRL transceiver connected to the modem. If this level must be reset, proceed as follows:
a.If required, remove the modem board from the housing as described in Step a of Section 2.3.2.
b.Configure the telemetry equipment connected to the RS-232 jack to transmit a continuous data signal.
Alternatively, if no equipment is connected to this jack, configure S101 with switches 1 and 7 ON. Then
move switch 6 to ON to key-up the modem. The modem will transmit a continuous alternating space/mark
tone from U230.
S101
7
8
1
2
3
4
5
6
ON
ON
N
O
R
M
A
L
/L
O
O
P
C
O
N
V
E
N
T
IO
N
A
L
B
E
L
L
2
0
2/
1
03
S
Q
U
E
L
C
H
I
N
V
E
R
T
H
A
L
F
/F
U
L
L
D
U
P
L
E
X
O
PT
1
O
PT
2
O
PT
3
0
1
