User Manual（FCC Version Draft）
This manual is applicable to the following product:
P53U,BF-1903,P53UH,P53UL,P53X，P54U,BF-1904,P54UM,P54G,P54X
1. Antenna
2. Encoder: rotate clockwise or counter-clockwise to select the desired channel
3. Power/volume knob-turn clockwise to power on and increase the volume level.
Turn counter-clockwise to decrease the volume level and power off.
4. Speaker
5. Built-in microphone
6. Led indicator: RED: TX; GREEN: RX.
7. PTT: push this button to transmit, release it to receive.
8. Side key 1: hold down this button to activate the Monitor function.
9. External Speaker/Mic Jack- allows the connection with external devices such as headsets, microphones.
10. Battery release latch.
11. 2800mAh Li-Ion battery pack.
12. Micro USB charging port
Operations
Power on/off and volume adjustment
Rotate the
Power/Volume
knob clockwise to turn the radio on. Rotate the control clockwise /counter-clockwise to adjust
the volume level as you prefer. To turn the radio off, rotate the control counter-clockwise till hearing a mechanical “click”.
Transmission
To communicate, all radios in your group must be set to the same channel. Briefly press the
Side key 1
to enable the
Monitor feature in order to make sure that the frequency is not busy, and then press the
PTT
key. Release the
PTT
key to
receive. Only one user at a time can talk during radio communications. Therefore, it is important not to transmit when you
are receiving a communication and use the transmission mode sparingly to allow other users to talk. Transmission
consumes a significant amount of energy and should therefore be used sparingly to prolong the battery life. If you are
unable to contact a station that you have no problems in receiving, the station may be using CTCSS tones or DCS codes.
Monitor
The Monitor feature is for excluding (opening) the Squelch, in order to listen to signals that are too weak to keep the
