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Issue 3
Technical Specification
Microphone
Line
Nominal output level
2.5mV
250mV
Maximum output level limiter operating
7mV
700mV
Output impedance
47 Ohms
400 Ohms
Frequency response
250Hz – 10KHz
Power requirements BDM308 24V DC 50mA standby 170mA max
BDM316 24V DC 60mA standby 300mA max
BDM304, 308 and 316 Connections
Microphones are terminated to a 25 way 'D' connector. They are supplied with a BMS25 single
gang socket box and connections are made using screw terminals.
FUNCTION
BMS 25 CONNECTIONS
ZONE 1
1
2
NPN open
2
3
collector
3
4
outputs
4
5
40V @ 100mA
5
6
Max. to
6
7
zone select
7
8
relays etc.
8
9
Connects
9
10
to 0V when
10
11
the zone and
11
12
speak keys
12
13
are selected
13
14
together or
14
15
all call only
15
16
24
AUDIO -
Output floating
16
CABLE SCREEN -
Connect to 0V
17
AUDIO -
Output floating
18
0V
19
24V DC -
Supply input
20
ACCESS -
Amplifier connects to 0V when speak or
21
All Call keys are pressed. 24V @ 30mA
BUSY Indicator -
Switch to 0V to illuminate
22