TELIKOU
BK-603 Belt Pack
2
T (Tip) --- hot
R (Ring) --- hot
S (Sleeve) --- Common
3. Power Switch and Volume
A knob with switch. This knob is used to control the level of audio signal received from the
intercom line, and can be used to adjust the volume of earphone. Turn the control completely
anticlockwise to turn this unit off. When unit is not being used, please turn off. Especially
when using battery to supply power.
4. Power and Low Voltage Indicator
Green LED indicates voltage is normal. Red LED indicates battery voltage is low.
5. Battery
BK-603 can use four No.5 size or one 6F22 9V size batteries. If voltage is lower than 5V
When using No.5 size battery, Power and Low Voltage Indicator will light red.
Notes: When using 6F22 size battery, the Power and Low Voltage Indicator will
still light Green if battery voltage is lower than 5V.
6. Audio Signal Connector
3-pin XLR male connector. Configuration pin outs:
Pin 1 -- Common
Pin 2 – DC Power (15V-30V)
Pin 3 – Audio Signal
When connect to intercom system, BK-603 can get power from main station from Pin2. When
connect to some audio signal, Bk-603 get power from battery. Pin2 is Null. For example,
when BK-603 connect to cell phone, Pin1 connect to cell phone’s earphone jack common.
Pin3 connect to cell phone’s earphone jack hot. Pin2 is null.
Troubleshooting
Problem: No voice from earphone
Cause: Wrong earphone wiring. For example, using mono earphone may cause audio signal
short.
Solution: Change earphone connector wiring followed by the manual
Specifications
Input impedance: >100 ohm
Load impedance: 8-32 ohm
Bandwidth: 200Hz-8000Hz ± 2dB
SNR: >72dB
Power assumes:
Static states: <12mA
Working States: < 200mA
Voltage:
Intercom Line: 15-30 volts DC
Battery: 6-9 volts DC
Environment: 0~70°C
Dimension: 105mm x 87mm x 48mm
Compatibility
The BK-603 is compatible with TELEX and Clear-Com Party-Line intercoms.
