YEONHWA M TECH MD 100D User Manual

RF Audio/Data Modem

User Manual

MD-100D VHF

MD-400D UHF

1. MD-100D/400D Digital RF Modem Main Functions

The MD-100D / 400D digital RF modem has standardized the external appearance and connector
specifications 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 as same as existing digital radio.
It is possible to use transmitter and receiver as a single device when it is used for the village
broadcasting.
In case of data communication, it can be used as a general data modem and it is designed to use AT
COMMAND.

YeonHwa M Tech Co.,Ltd

36, Jeonpa-ro 44beon-gi l, Mana n-gu, Anyang-si, Gyeonggi-do, Korea 14086

www.xradio.co.kr Email : [e-mail]

G

F
F

N
C
D
S
W
P
C

MD
MD

±1.5ppm (
1

12.5KHz
AMBE++
110mm(H) x 25mm(W) x 51mm(D)
280
DC
Receive Mode
T
Standby Mode

R

R
S
Selectivity
Spurious and Harmonic Rejection
FM Hum and Noise
A
A
A

0.25uV 12 dB SINAD

0.22uV 10dB SINAD
65dB (12.5KHz)
70dB
40dB (12.5KHz)
1Vrms
Less than

+1,

MD-100D / 400D supports dual (analog / digital) mode. It is compatible with existing analog modem or
transceiver. When using digital mode, it is very efficient in data error, clean sound quality and volume,
distance and usage time.
32 channel can be selected by using internal DIP switch.

MD-100D/400D Series main functions are below,

 Frequency band - VHF : 150.8~173.4MHz, UHF: 400~470MHz.
 1 Zones 32 channel selection (1zone = Max 32 channel) .
 Total 32 channels can be set.
 RF Power - VHF : 10 Watt, UHF : 5Watt
 ETSI Standard DMR Protocol Tier1, 2
 Industry Standard AMBE+2 Voice Codec
 Dual mode(Digital & Analog)

Add AT Command for user convenience.


 3wires continuous mode / 5wires continuous mode
 Standard 1Vrms Audio Output (adjustable up to 2.5Vrms).

 Carrier Detector
 Encryption mode (AES128, 192, 256) - Option

 RF Communication Data Speed : 9,600bps
 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 Female Connec tor


 Power Supp l y Voltage : DC +12V
 Dimensions : 4.77”(H) x 2.44”(W) x 0.96”(D)

2. Specification

2.1 MD-100D/400D eneral Information

requency Range
requency Stability

umbers of Channel
hannel Spacing
igital Vocoder

ize

eight

ower

urrent Consumption

eceiver Specifications

eception Sensitivit y

quelch Sensitivity

udio Output
udio Distortion
udio Characteristics

-100D : 136~174 MHz

-400 : 400 ~470 MHz

-30 to +60℃)

Zones / 32 Channels

g
+12

, When using Audio – 350 mA (Audio Max)

ransmit Mode – 1,200mA

– 110mA

3%

-3 dB from 6dB per octave de-emphasis Characteristic from 300 ~ 3000Hz

T

ransmitter Specifications

RF Output
Spurious and Harm
FM Hum and Noise
A
A
Output Impedance

VHF :
70dB
40dB (12.5KHz)
Less than

+1,

50ohms

10/2 Watt, UHF : 5/2Watt

onic

udio Distortion
udio Characteristics

3%

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

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 A T command, als o it can be appli ed in var ious fie lds .

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

3.4 D-SUB 15Pin Connector Specification

Pin NO Pin Name

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 3.3V TTL O

12 RTS O

13 GPS_TX_DATA 3.3V TTL O

Pin Description

I/O

14 Ground Ground

15 GPS_RX_DATA 3.3V TTL I

Figure 3-3) D-SUB 15PIN

3.5 MD-100D/400D Drawing

Figure 3-4) MD-100D/400D Drawing

4. How to set DIP Switch

Dip Switch

Power Value

DIP Switch

Binary

Channel Value

00000

1

4.1. Dip switch setting

Picture 4-1) Dip Switch TX Power setting and channel setting

4.2 TX Power Setting

TX Power is changed by Switch No.6

Factory default TX Power value is High

Low Power

High Power

Picture 4-2) DIP Switch RF Power Setting

4.3 Channel Setting

There are two ways to set the channel: DIP switch and AT command.
DIP switch channel setting method can be set by using DIP switch 1, 2, 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 according to the DIP switch when booting.

2) When changing channel with AT Command, DIP Switch will be ignored and return to DIP Switch
setting through AT Command (AT * DIP = 1).

DIP Switch Meaning
1 DIP Switch: Binary 5 digit
2 DIP Switch: Binary 4th digit
3 DIP Switch: Binary 3rd digit
4th DIP Switch: 2nd digit in binary
5th DIP Switch: Binary 1st digit

Below is the channel table according to DIP Switch status.