Installation manual

1
9532P-62 (03-11)
26
of 32
• F
or Weather/2-Way Radio Connection (Listen Only):
q It is very important to follow these instructions carefully. Failure to do so may
result in serious damage to your radio equipment or the Series 9800 Marine
Intercom System.
q Locate the Speaker/Audio outputs on the radio. Determine the method of connection
(terminals, connector, etc.).
q See Figure 18 & Table 3 which show how to connect an isolation transformer between
the radio and the C98-20AX cable. Stereo installations require two transformers.
q The installer will fabricate the circuit in Figure 18, mount it in an appropriate enclosure,
and interface it with the radio and the C98-20AX cable.
q The David Clark Company recommends using a SP-70 transformer (P/N: 09363P-34).
q Note that two 1000pF, 50WVDC capacitors are also required.
RADIO 3
SPEAKER HI
RADIO 3
SPEAKER LO
STEREO LEFT
S
TEREO RIGHT
STEREO RETURN/SHIELD
600Ω : 600Ω *
AUDIO XFMR.
1
2
3
4
SP-70 or EQUIVALENT
WIRE
FUNCTION
I
NPUT
FUNCTION
C
98-20AX
AUXILIARY INPUT
CABLE WIRE COLOR
G
REEN
RED
BLACK/SHIELD
1000 pf + 10%
(5
0 WVDC)
1000 pf + 10%
(
50 WVDC)
F
igure 17: Audio isolation transformer circuit used to interface to Ext. Speaker of 2-Way/Wx radio
Wire Color Function
Green Left
Red Right
Black/Shield Return
T
able 3: C98-20AX Wire Color Chart