8525B/8528 Technical Service Manual General Information 1-9
Publication No: 15-02036 Issue 6
Option PS
Note: Option PS cannot be fitted with internal option SDE or SDEM.
Pin Number Function Signal Level
1 0V Ground
2 Rx FSK Tones
Output
Nom. 1.5Vpp (From
2k ohms)
3 FSK Tx Tones Input 3Vpp (22k ohm Input
Impedance)
4 Quiet Line +10V (ON) or
floating (OFF)
5 Alarm Tones I/P 3Vpp into 100K ohms
6 PTT Input: 0V = PTT
7 Scan +10V output in scan
8 A rail + Battery supply out
Options SDE, SDEM (External Alarm) and PP (Supply for remote
control)
Note: Options SDE or SDEM cannot be fitted with Option PS.
Pin Number Function Signal Level
1 Unswitched Supply Battery +ve (PP only)
2 & 3 External Alarm Contacts rated at 50V
1A DC. Closed when
external alarm
required.
4 Unswitched Supply Ground (PP only)
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