Baldwin Boxall BDM 208, Operating Instructions

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4. Bass Cut
Bass cut operating at 350Hz is selectable if required. This can be particularly advantageous to overcome the
affects of talking closely to the microphone.
5. Limiter
Selecting the limiter will ensure that the signal level remains fairly constant irrespective of input level changes.
Using it will prevent system overload when different personnel use the microphone or speak too close to the
microphone.
Technical Specification
MICROPHONE LINE
Nominal output level 2.5mV 250mV
Maximum output level limiter operating 7mV 700mV
Output impedance 47ohms 400ohms
Frequency Response 100Hz - 10KHz
Bass cut facility -3dB @ 350Hz
Power Requirements 24V DC BDM208 25mA Standby 200mA Max
BDM216 30mA Standby 345mA Max
BDM208 and 216 Connections
Both 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 CABLE COLOUR BMS 25 CONNECTIONS
ZONE 1 Green 1
2 NPN open Grey 2
3 collector Pink 3
4 outputs Orange 4
5 40V @ 100mA Turquoise 5
6 Max. to White/Red 6
7 zone select White/Blue 7
8 relays etc. Green/Red 8
9 Connects Red/Blue 9
10 to 0V when Yellow/Blue 10
11 the zone and Yellow/Red 11
12 speak keys Red/Black 12
13 are selected Red/Brown 13
14 together or Blue/Black 14
15 all call only Orange/Blue 15
16 Yellow/Green 24
AUDIO - Output floating Brown 16
CABLE SCREEN - Connect to 0V 17
AUDIO - Output floating Blue 18
0V Black 19
24V DC - Supply input Red 20
ACCESS - Amplifier - White 21
connects to 0V when speak or All Call keys are pressed. 24V @ 30mA
BUSY Indicator - Switch to 0V to illuminate Mauve 22