Features

BJ-851 is globally the only mini-size duplex and single-mode antenna units which 

consists of duplexer, receiver, transmitter, CPU controller ect. Aluminium diecasting 

outer cover of vehicular was adopted. It can be used both in cars and in a fixed place,

which is suitable for emergency situation.Full duplex communication can be achieved 

between two duplexers and single set can be used as repeater also.

It can be increase the communication distance, the same time it has many advantages such as easy to operate and convenient to use.

 

Specifications

General 

 

Frequency Range:400-470MHZ

Frequency Spacing:10MHZ

Duplex Band Width:1MHZ

Modulation Type:FM 16F3

Operating Voltage:12-14V

Current: standby current  :  0.3A       Rx current : 0.8A      Tx current :3.0A

Frequency Stability:  ≥2.5 PPM

Channel Spacing: 25KHZ/12.5KHZ

Weight:  Approx 2kg 

Specification of Duplexer

 

Frequency Spacing (MHZ): 10MHZ

Max Output Power (W): 10W

Receiving End Insertion loss (dB): ≤2dB

Transmitting End Insertion loss (dB):<1.5dB

Transmitting-Receiving End Isolation (dB):  ≥60dB

Max VSWR:1.5

Operating Temperature Range:－30-----＋60℃

Frequency Stability:Approx 2.5ppm/℃

Matched Impedance:50Ω

 

Receiver

 

Simplex Sensitivity:≥0.3uv(12dB SINAD)

Duplex Sensitivity:<3dB

Squelch Sensitivity:   ≥0.2uv

Selectivity: －70dB

Spurious Radiation: －75dB

Intermodulation Rejection: －75dB

Residual Noise: －45dB

DEMP FO: 6±3dB

Audio Output Power: 4.0W

Audio Distortion: <5%

Working Mode: receiving mode

 

Transmitter

 

Output Power:5-10W

Spurious Radiation: ≤80dB

Residual Modulation:－45dB

Audio Distortion:<5％

Max Modulation:5KHZ

Pre-emphasis Frequencies:6±3dB

Working Mode: Transmitting Mode

 

CPU Controller  

Receiving-Transmitting Frequency Setting 

Automatic Repeater Setting  

PC Programming 

CTCSS and DCS