User Manual
VHF Transceiver
MD-100D
UHF Transceiver
MD-400D
Version #1 (2017-08-01)
YeonHwa M Tech Co., Ltd.
36, Jeonparo 44beongil, Manangu, Anyangsi, Gyeonggido, Korea Tel: 82-31-444-7270
MD-400D User Manual
1. MD-420D Digital RF Modem Specification
The MD-Series standardized the specifications of the instrument exterior and connectors so
that the digital RF modem can m aintain compatibilit y with existing analog mode ms.
When using the digital mode, it is very efficient with the existing analog problems such as
data error, clean sound quality and volume, call distance, usage time
MD-Series Specification is as follows:
▪ Usage frequency VHF : 136~ 174MHz, UHF : 400~ 470MHz
▪ 1 Zones 32 channels selectable (1zone = M ax 32 channels)
▪ Total 32 channels can b e configured
▪ 5/1 Watt RF Power
▪ Encryption is available a s option (AES128, 256)
▪ 5 level S.Q selectable (S uppor t s Analog).
▪ Remote Radio Stun / Kill / Rev ive
▪ Available to connect spe aker of 1Watt
▪ Data rate in wireless section : 9,600bps
▪ RS-232C communication rate : Standard 115,200bps(Change available according to
program
setting)
▪ Add AT Command for user convenience
▪ User friendly for enabling PC based modem Control GUI Software
▪ Aluminum metal Frame Body
▪ Service connector : DE-15 pin Female Connector
▪ Power supply : DC +9.0~DC+24V
General
Frequency Range
Frequency Stability
Programmable Channels
Channel Spacing
Digital Vocoder
Dimensions
Weight
Power
Current Drain (maximum)
MD
MD
±1.5ppm (
1 Zones / 32 Channels
12.5KHz
AMBE++
103mm(H) x 52mm(W) x 32mm(D)
280g
DC +9.0 ~ +24V
Receive mode, rated audio out
Transmit mode
Standby mode
Receiver
Sensitivity
Squelch Sensitivity
Selectivity
Spurious and Harmonic Rejection
FM Hum and Noise
Audio Output Power
Audio Distortion
Audio Response
Input Impedance
0.25uV 12 dB SINAD
0.22uV 10dB SINAD
65dB (12.5KHz)
75dB
40dB (12.5KHz)
1 Watt across an 16
Less than 3% at rated output
+1,
Characteristic from 300 ~ 3000Hz
50 ohms
Transmitter
2. Specification
2.1 MD-Series Specifi cat io n
Source
-100D : 136~174 MHz
-400D : 400 ~470 MHz
-30 to +60℃)
– 420 (Audio Max)
– 1,200mA
– 110mA
-ohm load
-3 dB from 6dB per octave de-emphasis
RF Power Output
Spurious and Harmonic
FM Hum and Noise
Audio Distortion
Audio
Output Impedance
5/1Watt
70dB
40dB (12.5KHz)
3% maximum with 1KHz modulation
+1,
Characteristic from 300 ~ 3000Hz
50ohms
Frequency Response
-3dB from 6dB per octave pre-emphasis
3. MD Series Components
3.1 Equipment name
* Components may differ acc or ding to the request of buyers.
Figure 3-1) MD-400D Series Component
3.2 Status Display LED
This is LED which displays the equipment status.
The main status display is as follows:
① Red color when normal transmission
② Green color when normal receive
4. How to use MD-400D Series
4.1 Message transmission and receive tools
You can send and receive messages through the AT Command, but the PC tool is provided
to make it easier to use.
Figure 4-1) Message tool
4.1.1 Messages
It is possible to send and receive messages bet ween the modem and the mode m, and between
the modem and the term inal. By providing the PC inter face as above, convenie nt configuration is
possible. You can configure the file or database connection to store additional messages.
Since it is based on PC, it can be saved as much as the capacity of the PC can be allocated, so it
can be seen that the capacity is not limited.
4.1.2 Basic Protocol
Supports an ACK message to determine whether the opponent terminal has received. When a
message is sent, the receiving terminal automatically sends an ACK message. When the message
is received, the other term inal informs the rec eiving terminal that the m essage has been receiv ed
normally.
Description
Command to verify the m odem version information
Answer
*VERSION:<value1>
Figure 4-2) Normal Message Transmission and Receive Method
Figure 4-3) Action on Message Transmission Error
If an error occurs in the delivery of the message, the specified number of retries will be retransmitted
after 5 seconds.
Finally, there is no format restriction of characters, and it supports messages of up to 80 characters
4.1.3 AT Command
Use AT Command to set the status of the transceiver(radio) or to use the function.
After connecting the serial port, use the terminal program. The basic speed is 115,200 bps.
1) Modem version information verify command (VERSION)
Query
1. AT*VERSION
.
Parameters <value1>
S/W Version
OK
Description
Command to verify modem stat us
Answer
*CHKSTAT:<value1>
STAT ERROR – Error status
OK
Description
Command to verify modem inf ormation
Answer
*MINFO:<value1>,<value2>,<value3>,<value4>
Group ID
Example AT*VERSION
*VERSION:YEONHWA Modem v1.0
2) Modem Status verify command (CHKSTAT)
Query
2. AT*CHKSTAT
Parameters <value1>
STAT OK – Normal stat us
Example AT*CHKSTAT
*CHKSTAT:STAT OK
3) Modem information ver i fy command (MINFO)
Query
3. AT*MINFO
Parameters
<value1>
Channel number
<value2>
Frequency
<value3>
Call ID
<value4>
Example AT*MINFO
OK
Description
Command to reset modem
RESET
Going down terminal…
Description
Command use when sending message
Answer
MSG OK
Message to be sent
MSG OK
Description
*MINFO:1,440.000,1,1
4) Modem Reset (RESET)
Query
Answer
Parameters
Example
AT*RESET
<value>
Reset the modem
AT*RESET
RESET
5) Sending Message (MSG)
Query
AT*MSG=<value>
Parameters <value>
Example AT*MSG=TEST
6) Receiving Message (RMSG)
Command use when receiving message
Answer
RMSG=<value>
Parameters
<value>
Example
RMSG=TEST
Description
Command to verify when r eceiving message
Answer
AT*CHLIST?
Parameters
CHNUM: <value> : Current channel number
Receive message
7) Check channel list (CHLIST?)
Whole channel number: Classified channel number, RX
frequency, TX frequency
… <repeat>
Example
CHNUM:01
01:0:ANA,RX:441000000,TX:441000000
Description
Command to verify when r eceiving message
Answer
AT*CHSET=<value>
Parameters
<value>
Example
AT*CHSET=3
02:1:ANA,RX:423600000,TX:423600000
03:2:ANA,RX:423612500,TX:423612500
04:3:ANA,RX:423625000,TX:423625000
05:0:DMR,RX:440000000,01,TX:440000000,01
06:1:DMR,RX:423200000,01,TX:423200000,01
07:2:DMR,RX:423212500,02,TX:423212500,02
08:3:DMR,RX:423225000,03,TX:423225000,03
09:4:DMR,RX:423237500,04,TX:423237500,04
10:5:DMR,RX:423250000,05,TX:423250000,05
11:6:DMR,RX:423262500,06,TX:423262500,06
12:7:DMR,RX:423275000,07,TX:423275000,07
13:8:DMR,RX:117440512,07,TX:117440512,07
14:9:DMR,RX:117440512,07,TX:117440512,07
15:10:DMR,RX:117440512,07,TX:117440512,07
16:11:DMR,RX:117440512,07,TX:117440512,07
OK
8) Channel setting (CHSET)
Channel number
CH:03
OK
5. For Safe Operation
5.1 Precautions
Do not remove the ant enna from the radio or d o not transform the ante nna or
do not make any changes on the antenna. The strong el ectronic wave to be
emitted from the rad io can have an effec t on the perfo rmance of the radio and
can cause the radio to have a defect.
Do not use accessories (such as rechargeable battery, adaptor, external
• Do not give an excessive shock to the radio.
speaker microphone and earphone etc.) from the other makers, which can
cause defect on battery and malfunction or a defect on the radio.
Do not disassemble or r eorgan ize th e rad io. The d isass embl y or reorga nizat ion
will cause a defect or m alfunction on the radio. It will be impossible to re pair
afterwards. There will also be a punishment made by the Radio Waves Act.
Do not use other freque ncy except for the permitted frequency in order not to
be punished by the Radio Waves Act.
• Do not place the radio wher e the direct sunlight and/or t he high temperature
occurs..
• If the radio is placed for a long time in a c ar in s um m er, the hot temper atur e 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.
5.2 Influences on the Operations of Radio or Other Equipment
The radio emits a strong electronic wave, which may have an effect on the operation of other
equipment and also can be influenced by the other devices.
Please turn off the radio before boarding on the airplane.
When using the radio in the airp lane, please f ollow the rules or the instructions
of the flight attendants.
In case of the area that medical equipment are being used, please use the
radio after discussion with the equipment producer or the related doctor.
Please do not use the radio at the place where computer or other
electric/electronic de vices are being used. The strong electronic wave from the
cm for Occupational/Controlled Exposure and
radio can have an effect on the equipment.
6. Safety Notes
Please make sure to read the followings above for safe and effective use of the radio.
• An indication of the m aximum antenna gain perm itted to ensure compliance.
this would be 1.5 dBi.
• At the area where an electromagnetic forc e can be made, please make sure
to turn off the power of the radio.
• The user should limit the operation to 50%.
• RF Safety Distance of 13.21
29.46 cm for General Pop ulation/Uncontrolle d Exposure which met the FC C
Limits.
• Be careful that if the outer surface of the antenna is peeled off, there is a
danger of a topic.
7. Handling Caution
• An y changes or m odifications not expr essly approved b y the part y responsible for c ompliance with
the FCC regulations could void the user's authority to operate the equipment.
• It is forbidden to install or operate the device other than the responsible person (licensed person).
•The user manual is included in the box.
•How to use and install the product is shown in the figure.
8. Usage
Application
▪ Water/Waste Treatment
▪ 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
▪ Emergency Call Boxes
▪ Low Power Repeaters
Model Name
MD-Series
Serial No.
Purchase Date
Name
Address
W ar ranty Statement
Thank you for purchasing MD-100D/ MD-400D Series.
1. This product has passed strict quality control and testing process by YeonHwa M Tech.
2. Warranty is one year from the day of release.
• When there is malfunction of the product under normal operating conditions during the
warranty period, your authorized dealer and the service center will repair it free of charge.
3. Service fees will be charged for the following cases:
• When performance failed, malfunction or damaged after the warranty period.
• When the product is damaged due to user’s mishandling or improper operation.
• When the produc t is damaged due to fire, pollution, earthq uakes and an y other natural or
unnatural conditions, accidents etc.
• Malfunction by not keeping the notices written in the user manual.
• Malfunction by not using the appointed adaptor.
• When the product is damaged due to us er ’s modif ication, attem pts of repairing rather than
the appointed service center.
4. Product Check List
Purchaser
※
Please fill out this check list when purchasing the product.
YeonHwa M Tech Co., Ltd.
36, Jeonparo 44beongil, Manan-gu, Anyang-si, Gyeonggi-do, Kor ea 14086
TEL: 82-31-444-7270
FAX: 82-31-444-7271
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