Pub. 42004-376E
400-001 and 400-002NS RigCom Stations
Page 7 of 18
P:\Standard IOMs - Current Release\42004 Instr. Manuals\42004-376E.docx
08/19
System Wiring
The maximum line length for the complete system, while still maintaining maximum output signal, is
15,000 feet for a system with less than ten stations. This is based on No. 18 AWG wire, the stations
spaced equidistantly, and one station in talk mode at a time. For each station in talk mode, the signal
level reduces by half (see Figure 7 for systems with more than ten stations to determine the maximum line
distance).
Figure 7. Number of Stations vs. Line Length
Field Wiring Terminations
TB1
—
Speaker Terminal Block
Table 1. Speaker Output Connection at Terminal Block TB1
Name
Pin No. Description
16
1
16-ohm terminal for external speaker connection
8
2
8-ohm terminal for external speaker connection
COM
3
common terminal for external speaker connection
0
2
4
6
8
10
12
14
16
0
5
10
15
20
25
30
Li
ne L
e
ngth
1
8
A
W
G
w
ire
(
1
0
0
0
f
e
e
t)
Number of Stations
Number of Station per Line Length
