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If you Intercom set contains red colored Jack(4pin) –Jack(4pin) cable please use it
to connect external device to EXT port. Red plug of this cable is designated for EXT
port, and pink one –for external device like mobile phone or A/V sender over cellular
network (LiveU™, TVU™, etc).
Important notice:Some of audio devices detect connection of external microphone
by electric resistance. In this case you have to use ~3.5 kOhm resistor at the mic
input circuit for your EXT port cable (LIN+ pin at the diagram above, biggest one
closer to cable).
1) The working range of Bluetooth headsets mainly depends on two factors: its
transmitter power and how busy is the 2.4 GHz radio band with another Wi-Fi and
Bluetooth devices.
Transmission power is defined by BT Class:
Class 1 –100 mW (expect up to 100 meters range)
Class 3 –1 mW (usually about 10 meters)
If you need bigger range –choose Class 1 and try to avoid places with high density
of Wi-Fi networks at 2.4 GHz.
Sometimes the same headset can reach up to 100 meters in a park but only 20
meters in a city center.
2) LA –LB ports pinout was designed for typical PC/smartphone headsets and
provides necessary power to electret mic. You can use special adapter (not
included) to connect dynamic microphone but due to asymmetric input there may be
output sound leakage to input line. This interference comes from cable inter-lines
electric capacity and fully depends on quality of headset’s cable. Try to use shielded
one.
3) Use only high quality microUSB cable to recharge internal battery of Intercom.
Low quality thin cables has higher electric resistance, this can overload and break
the internal power driver of Intercom. Fully charged battery can power the device for
more than 5 hours.
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this manual are for identification purposes only. Use of these names, logos, and brands does not imply endorsement.
