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Transmitter Specifications 

RF Output 
Spurious and Harmonic 
FM Hum and Noise 
Audio Distortion 
Audio Characteristics

 

Output Impedance 

VHF : 10/2 Watt, UHF : 5/2Watt 
70dB 
40dB (12.5KHz) 
Less than 3% 

+1, -3dB from 6dB per octave pre-emphasis Characteristic from 300 ~ 3000Hz 

50ohms 

 
 
 
 
 

 
 

3. Specification 

3.1 MD-100D/400D Overview 

MD-100D/400D  are digital RF modem that supports data and voice communication. It supports serial 
interface, and it is set and operated with AT command, also it can be applied in various fields. 
 

3.2 MD-100D/400D functions 

-. RF Communication Data Speed : 9,600bps 
-. Serial Interface support (AT Command) : 115,200 bps 
-. Frequency band : 400MHz ~ 470MHz 

 

3.3 MD-100D/400D External Interface 

 

 

Picture 3-1) Main Pin Specification 

 
 

 

Picture 3-2) MD-100D/400D Digital RF Modem 

 
 

Summary of Contents for MD-100D Series

Page 1: ...to maintain compatibility with existing analog modems It also supports voice call and data communication with DMR transceiver and standard When making a voice call use external microphone and speaker...

Page 2: ...RS 232C communication speed standard 115 200bps changed according to program setting PC based modem Control GUI Software for user convenience Aluminum metal Frame Body Service Connector DE 15 Pin Fem...

Page 3: ...ation 3 1 MD 100D 400D Overview MD 100D 400D are digital RF modem that supports data and voice communication It supports serial interface and it is set and operated with AT command also it can be appl...

Page 4: ...iption I O 1 Not use 2 Not use 3 PTT Low Active I 4 DC12V DC 12V I 5 CTS I 6 Carrier Detector O 7 MIC_IN 30mV 2KHz Dev I 8 FLASH_PRO I 9 SPEAKER_OUT 300mV 1KHz dEV O 10 RX_DATA 3 3V TTL I 11 TX_DATA 3...

Page 5: ...3 5 MD 100D 400D Drawing Figure 3 4 MD 100D 400D Drawing...

Page 6: ...3 4 5 total 32 channels AT Command channel setting has the following rules for the priority of the two methods When the power is turned on the MD 100D 400D operates as follows 1 The channel is set ac...

Page 7: ...110 15 01111 16 10000 17 10001 18 10010 19 10011 20 10100 21 10101 22 10110 23 10111 24 11000 25 11001 26 11010 27 11011 28 11100 29 11101 30 11110 31 11111 32 5 MD 100D 400D Operation Mode MD 100D 40...

Page 8: ...3WIRES AT CMODE 5WIRES AT CMODE OFF Select the required mode from above 6 AT Command interface Set the status of MD 100D 400D or user AT Command for function operation The serial Speed is 115 200 bps...

Page 9: ...ignored when setting the channel with AT Command If you want to change the channel using the DIP switch again you can use this command to change the channel so that it can be changed by DIP Switch op...

Page 10: ...ription Show channel list command Query Answer AT CHLIST CUR CHNUM Current channel number number Channel type RX RX Frequency RX CC TX TX Frequency TX CC OK Parameters Example AT CHLIST CUR CHNUM 04 0...

Page 11: ...AT MSG ASCII Data 80 byte 0D0A 2 Structure to send text documents using Tera Term wirelessly 1 RS 232C Serial Buffer of MD 100D 400D Data Modem has a total of 10 Kbytes Each buffer stores 80 bytes of...

Page 12: ...How to use RS232 RS422 RS485 USB GPIO Ethernet connection 4 Did you use CTS and RTS for the cable 1 The serial buffer of MD 100D 400D is 10Kbyte If you want to transfer a lot of data when the amount o...

Page 13: ...normal serial data to the modem When RTS is High when the serial buffer of the MD 100D 400D modem is full it stops sending serial data to the external device When CTS is LOW data received by modem is...

Page 14: ...Not use Not use CTCSS DCS I 2 Not use Not use CTCSS DCS O 3 PTT Low Active I 4 Vin DC12V DC 12V I 5 GPIO1 CTS I O I 6 Carrier Detector O 7 MIC_IN 30mV 2KHz Dev I 8 FLASH_PRO I 9 SPEAKER_OUT 300mV 1KHz...

Page 15: ...e hot temperature in the car may cause explosion of battery Do not make a damage to the battery by a sharp substance and or an excessive shock Do not use other frequency except for the permitted frequ...

Page 16: ...in the figure An indication of the maximum antenna gain permitted to ensure compliance this would be 1 5 dBi At the area where an electromagnetic force can be made please make sure to turn off the pow...

Page 17: ...ment Plants Oil and Gas Field SCADA Security Alarm System Gate Systems Remote Controls Commercial Sign Control Automatic Vehicle Location Murphy Kill Switches Weather Monitoring Irrigation Systems Eme...

Page 18: ...d When the product is damaged due to user s mishandling or improper operation When the product is damaged due to fire pollution earthquakes and any other natural or unnatural conditions accidents etc...

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