MDS 05-2818A01, Rev. C
MDS P-60/P-60 HL Reference Manual
33
Connector J1 on the Analog Interface Utility Board is used for all audio and
keyline terminations. Refer to
Table 5
for a summary of J1 pin connections.
Figure 17
shows a detailed view of the Analog Interface/Utility Board.
Figure 17. Analog Interface/Utility Board Connections—MDS P-50
Table 5. J1 Pin Connections (Analog Interface/Utility Board)
J1
PINS
CONNECTION
REMARKS
1 & 2
Transmit Audio
600
, balanced
3
No Connection
4 & 5
Receive Audio
600
, balanced
6
No Connection
7 & 8
Keyline connection for positive or negative
keying
This arrangement allows the radio to be keyed
by a variety of different methods that will
accommodate most systems.
See “Keyline
Options” on Page 34.
8 & 11
Keyline connection when an internal current
source is used. (Requires a jumper between
Pins 7 and 10.)
This method uses the on-board 12 volt DC
supply.
See “Keyline Options” on Page 34.
9
AC Failure Alarm
Normally 11 Vdc; drops to zero volts if an AC
failure occurs.
10
+13 Vdc
Accessory power (2 Amp maximum) jumpered
to Pin 7 for keying with an internal current
source. See description for Pins 8 & 11 above.
11
PCB ground connection
Connects to ground on the Interface/Utility
Board.
12
Received Signal Strength Indication (RSSI)
Approximately 0 to 5 Vdc through a 10K
resistor.
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