What main function of our moblie radio?                                                                          

1.8 DOT- matrix graphic display true color 
big- the size, color screen allows access to desired information easily, even in bright sunlight. 
clock & date is appearing on the screen for everyday use. 
multiple languages 
tm840 supports multiple languages such as English, Simplified Chinese, German and French. 
one-touch operation use 
tm840 offers four programming keys and two keys on the keyboard programming, which provides one-touch operation like text messaging, voice calls. 
versatile voice and data service 
Intelligent tm840 supports various voice call types, including Private Call, Group Call, all calls and emergency call as well as the rich, and data services. g. gps, text message, ip connect and transfer data. 
Data and Voice Privacy 
supports tm840 fighting, analog and digital encryption using Advanced Encryption Standard (AES) * 1 and des arcfour (ARC4) encryption methodology for voice and data. 
gPS 
Integrated GPS enables real-time monitoring of mobile team. 
location of lip information protocol 
master tm840 allows the user to send messages to users gps slave in case of need. 
various analog signaling types 
supports various analog signaling types tm840 (kdc1200, DTMF, 2-tone and 5-tone), various types of control squelch (CTCSS / CDCSS), thus providing a greater expansion capacity function for the analog mode. 
complementary services 
tm840 supports complementary services radio check, remote monitor, call alert, radio radio on and off. 
accessory including analog / digital expansion 
Telephone Interconnect (dtmf via) 
tm840 is designed to develop accessories via the second port of the mobile rear doors, and. g. emergency pedal. 
Moreover, it can support simplex voice communications between radio and telephone users. it allows a user to make a radio telephone call or a telephony user to any group or private call to radio users through private exchange (PABX) or public switched telephone network (PSTN) automated branch. 
dual modes (analog + digital) 
tm840 operates in an analog or digital mode on each channel. is compatible with the prevalent analog system, ensuring a good analog to digital transition. 
scan 
tm840 support the verification of pure analog voice and signaling, pure digital voice and data, and also verify that comprises mixed mode analog and digital activities. 
What  parameter of our moblie radio?                                                                               

general 
frequency range  400 ~ 470MHz 
channel capacity  1024  
channel spacing  12.5 khz 
Normal operating voltage  13.8V 
operating temperature  -30 ~ +60 
Storage temperature  -40 ~ +85 
esd  iec 61000-4-2 (level 4) 
dimension (with battery and antenna)  50mm & 175mm × 205mm 
weight (with battery and antenna)  1.5kg 
transmitter 
frequency stability  & ± 1.5 ppm 
power  25w / 45w 
modulation limiting  2.5khz12.5khz 5khz25khz, 
FM hum and noise  -40db12.5khz -45db25khz 
performed / emission of radiation  - 36dBm <1ghz, - 30dBm> 1ghz 
transient adjacent channel power  - 50db12.5khz - 60db25khz 
FM modulation mode  12.5 khz: 11K0F3E 25 khz: 16K0F3E 
4 fsk digital modulation 
12.5kHz (data only): 7k60fxd 
12.5kHz (data + voice): 7K60FXE 
Precision 4 fsk modulation  5 10% 25%, temperature extremes 
maximum deviation modulation  2.5khz12.5khz 5khz25khz, 
frequency pulling during transmission  & ± 100Hz 
power non-native slot  - 57 dbm 
audio response  + 3dB, -3db 
audio distortion  3% 
vocoder  ambe ++ 
digital protocol  etsi ts 102 361- 1st 2 
receiver 
frequency stability  & ± 1.5 ppm 
digital sensitivity  0.22 & mv / - 120 dBm 
intermodulation  TIA603C: 70db etsi: 65db 
adjacent channel selectivity  Etsi 60db12.5khz 70db25khz, 
co-channel rejection  12db12.5khz 8db25khz, 
spurious response rejection  TIA603C: 75db etsi: 70db 
conducted spurious emission  -57dbm <1 ghz, -dBm 47> 1 ghz 
lock   90db 
modulation acceptance  3.5khz12.5khz 7khz25khz, 
audio distortion rated    3% (typical) 
hum and noise               -40db12.5khz -45db25khz 

audio response         + 3dB - 3dB