QM-products DHM-2057 User manual

DHM-2057 DVB-T SD&HD
Encoder & Modulator with USB
Home Use
User Manual

Thank you for buying this encoder modulator.
Please read this manual carefully to install, use and maintain the encoder modulator in the best conditions of
performance. Keep this manual for future reference.
Directory
CHAPTER 1 Product Introductions .......................................................................... 1
General Description ................................................................................................ 1
Working Principle.................................................................................................... 1
Technical Specifications........................................................................................... 1
CHAPTER 2 Safety Instruction and Installations...................................................... 4
Safety Instructions................................................................................................... 4
Installations............................................................................................................. 4
CHAPTER 3 Operations and Management .............................................................. 6
CHAPTER 4 How to Upgrade ................................................................................. 10
Appendix ............................................................................................................... 11

1
CHAPTER 1 Product Introductions
General Description
QM-products DHM-2057 HD&SD encoder & modulator is designed based on consumer electronics which allow
audio/video signal input in TV distributions with applications in home entertainment, surveillance control, hotel
Digital Signage, shops etc.
It is an all-in-one device integrating MPEG-4 AVC/H.264 encoding and modulating to convert audio/video
signals into DVB-T RF out.
The signals source could be from STB, satellite receiver, closed-circuit television cameras and antenna etc. Its
output signal is to be received by a DVB-T standard TVs or STBs etc.

2
Technical Specifications
HDMI Encoding Section
Video
Encoding
H.264 MP@L 3.0/3.1/4.0
Interface
HDMI*1
Input
Output
Resolution
480@59.94/60p
480@60p
480@59.94/60i
480@30p
576@50i
576@25p
720@50/59.94/60p
720@50/59.94/60p
1080@50i
1080@25p
1080@59.94/60i
1080@30p
1080@59.94/60p
1080@30p
Aspect Ratio
16:9, 4:3
Bit rate
1.000~18.000 Mbps
Audio
Encoding
MPEGI layer 2
Sample rate
48KHz
Bit rate
64, 96,128, 192, 256, 320kbps
CVBS Encoding Section
Video
Encoding
H.264 MP@L 3.0
Interface
CVBS*1 (RCA)
Resolution
Input
Output
480@60p
480@60p
480@60i
480@30p
576@50p
576@50p
576@50i
576@25p
Aspect Ratio
4:3
Bit rate
1.000~18.000 Mbps
Audio
Encoding
MPEGI layer 2
Interface
Analog Stereo/Mono (Unbalanced RCA)
Sample rate
48KHz
Bit rate
64, 96,128, 192, 256, 320kbps

3
DVB-T Modulator Section
Standard
DVB-T COFDM
Bandwidth
6M, 7M, 8M
Constellation
QPSK, 16QAM, 64QAM
Code rate
1/2, 2/3, 3/4, 5/6, 7/8
Guard Interval
1/32, 1/16, 1/8, 1/4
Transmission Mode:
2K, 8K
MER
≥31dB
RF frequency
142.5~946 MHz, 1KHz step
RF output level
-14~ +6dBm, 0.1db step
System
RF mix in ATT
10 dB
Management
Local LCD + control buttons
Language
English
LCN Insertion
yes
Upgrade
USB
General
Power supply
DC 12V
Dimensions
183*110*50mm
Weight
< 1kg

4
CHAPTER 2 Safety Instruction and Installations
Safety Instructions
WARNING: Hot plug is not allowed since it may cause system halted.
To prevent fire or electrical shock, do not expose the device to rain or moisture.
The encoder modulator is powered with a voltage of 12V DC. The power supply voltage
must not exceed the recommended voltage, which otherwise may cause irreparable damage
to the device and the invalidation of the warranty. Therefore:
Do not replace power supply with a voltage greater than 12V DC.
Do not connect the device to the power if the power cord is damaged.
Do not plug the device into mains supply until all cables have been connected correctly.
Do not cut the cord.
Avoid placing the device next to central heating components and in areas of high
humidity.
Do not cover the device with elements that obstruct the ventilation slots.
If the encoder modulator has been kept in cold conditions for a long time, keep it in a warm
room minimum 2 hours before plugging into the mains.
Mount the device in vertical position with the connectors located on the top side.
When replacement parts are required, be sure the service technician has used replacement
parts specified by the manufacturer or have the same characteristics as the original part.
Unauthorized substitutes may result in fire, electric shock or other hazards.
Safety check- Upon completion of any service or repairs to this device, ask the service
technician to perform safety checks to determine that the device is in proper condition.
Installations
RISK of damage to the unit
Mechanically handling the unit may result in damage. Do not connect the unit to the power
supply before or during assembly. Connect the unit as below instructed.
NO HOT PLUG AND CONNECT THE CABLE AS FOLLOWING STEPS.
1.Mount and tighten the screws and plugs
to secure the unit to the wall. Left 10 cm
of free space around from each unit.
1

5
2.Connect the signal input in
the respective connectors.
The signal source can be from
a surveillance monitor, DVD,
set-top box, CCTV and etc.
3.Optionally, connect the
loop-through RF input coaxial
cable.
4.Connect cable to RF output
to STB/TV.
5. Power supply connection: a) Connect the earth cable; b) Connect the power plug to the unit mains
connector; c) Connect the power plug to the mains socket.
Cascade Installation
DHM-2057 unit has 1 TV signal to RF output encoded as DVB-T Digital TV signal.
Several DHM-2057 units can be
cascaded in order to increase
the capacity. The maximum
capacity of a series of N units is
1xN incorporated TV signals. To
cascade 2 or more units,
connect the RF output of the
preceding unit to the TV input
(loop-through) of the next unit
(see right illustration).
4
2
3
5

6
CHAPTER 3 Operations and Management
DHM-2057 is controlled and managed through the key board and LCD display.
LCD Display –It presents the selected menu and the parameter settings. The backlight in the
display is on when the power is applied.
LED –These lights indicate the working status
Power: It lights on when the power supply is connected.
Alarm: It lights on when there is error, such as the signal source loss.
USB: It lights on when the USB properly connected and detected.
Left/Right/Up/Down buttons –Use these buttons to turn the screen pages, shift the target
items by moving the triangle, or change the parameter settings in the program mode.
Enter –Use this button to enter a submenu or save a new setting after adjustment; press it
to start adjusting the value of certain items with Up/Down buttons when the corresponding
underline flash;
Hue
1
Hue
+001
Hue
+001
Hue
+002
Enter ►
►
►
►
Press it to activate the hidden selections and change the setting with Up/Down (or Left/
Right) buttons.
Audio Bit rate
128
Audio Bit rate
*128
Audio Bit rate
►128
Audio Bit rate
►192
Enter
►
►
Enter
Menu –Press this button to step back
Lock –Locking the screen / cancelling the lock state, and entering the main menu after the
initialization of the device. After pressing lock key, the system will question the users to save
present setting or not. If not, the LCD will display the current configuration state.
When the power is connected, the LCD will start to initialize the program. The LCD menu
goes as below chart.

7
Main Menu
Modulator
Modulator
Constellation
Modulator
FFT
Modulator
RF Frequency
Modulator
RF Level
Modulator
Bandwidth
Constellation
►64QAM
RF Frequency
650.000 MHz
RF Level
-10.0 dBm
Bandwidth
►6M
8
9
10
11
12
13
Initializing
DVB-T 650.0MHz
1080i 6.93Mbps
Lock
Enter Menu
1
Up Down
Main Menu
Status Status
Alarm 2
Status
Uptime 3
6
Main Menu
Encoder 4
Encoder
Inputface
Video In Status
Resolution
Video Bitrate
Audio Bitrate
5
FFT
►2K 8K
Modulator
Guard Interval
Modulator
FEC
Guard Interval
►1/32
FEC
►7/8
15
Main Menu
System System
Save Config
System
Load Saved CFG
System
Lock Keyboard
System
Product ID
System
Version
Save Config?
Yes ►No
Load SavedCFG?
Yes ►No
Lock Keyboard
Yes ►No
0035564905656
70ec8f7b0000f
Encoder Modulator
Ver: 1.01
Main Menu
Stream Stream
TSID
ONID
Network ID
Network Name
Private data
NIT insert
NIT Ver Mode
Service Name
Provider name
Program number
LCN Mode
LCN
PMT PID
Video PID
Audio PID
System
Factory Reset
System
LCD Time-out
Reset all sets?
Yes ►No
LCD Time-out
►30 s
System
Key Password Set Password
000000
7
14
16
17
18
19
21
20
22
Modulator
Country
Modulator
Channel
Modulator
Advanced Config
Country
Default
Australia
NewZealand
Sweden
Italy
Modulator
Bitrate
Channel
* 177.5 CH 6
23
Bit Rate(atc/max)
6.986M/31.668M

8
1) DVB-T: modulating standard; XX.XXX MHz: the current output frequency; 1080i: video
resolution of signal source; X.XX Mbps: the current encoding bit rate
2) Alarm Status: For example, if the signals lose, it will give alarm and display error type
under this menu. For example: Video Not Lock
3) Uptime: It displays the working time duration of the device. It times upon power on.
4) Encoder Parameters: User can enter the items respectively to set Encoder parameters.
Interface: To select the input port (HDMI or CVBS). Video in Status: User can view the video
status under this menu. Resolution: signal source resolution, read-only. Video Bit rate: adjust
in the range of 1.000~18.000 Mbps. Audio Bit rate: Select audio bit rate among 64, 96, 128,
192, 256, 320kbps.
5) Stream: User can view or adjust TSID (Transport Stream ID), ONID (Original Network ID),
Network ID, Network Name, Program number, LCN (Logical channel number) and etc for the
output TS after enter this menu.
NIT: (Network Information Table) NIT table is a very important table for describing the
network and TS. User can enter the submenus displayed and edit the values or select modes.
6) Country: User can choose country under this menu. There are five options Default,
Australia, New Zealand, Sweden and Italy. If user chooses Default, modulating parameters
need to be set manually through advanced configuration. If choose other four, user do not
need to set RF frequency, Bandwidth, Constellation, FEC, FFT, Guard interval and RF Level. It
will configure automatically according to the Country and Channel. It is a shortcut.
7) Channel: User can choose Channel under this submenu.
8) Bit Rate: User can read the current modulating bit rate and the maximum bit rate
9) RF Frequency: Adjust it at range of 142.5 MHz to 946MHz. Set it according your regional
situation or inquire your local services.
10) Bandwidth: choose between 6M, 7M and 8M.
11) Constellation: DVB-T modulator contains 3 constellation modes –64 QAM, QPSK and 16
QAM.
12) FEC: Forward Error Correction rate. It contains 1/2, 2/3, 3/4, 5/6 and 7/8.
13) FFT (Transmission Mode): Select between 2K and 8K.
14) Guard Interval: Select among 1/32, 1/16, 1/8 and 1/4.
15) RF Level: Adjust it at range of -14~ +6dBm.
NOTE: The different combination of bandwidth, constellation, guard interval and FEC
(code rate) will form a different output code rate. Please refer to appendix table 2. To

9
ensure the output image quality, it is required the output code rate to be higher than
22 MHz.
16) Save Config: Yes/No-to save/give up the adjustment of setting.
17) Load Saved CFG: Yes/No-to load/ not to load the saved configuration.
18) Factory Reset: Yes/No-choose/not choose the factory’s default configuration.
19) LCD Time out: A time limit that LCD will light off. Choose among 5s, 10s, 45s, 60s, 90s and
120s (seconds).
20) Key Password: to set a 6-digit password for unlocking the keyboard.
21) Lock Keyboard: Choose Yes to lock the keyboard, then the keyboard will be locked and
cannot be applicable. It is required to input the password to unlock the key board. This
operation is one-off. (Password forgotten, please use the universal code “000000”.)
22) Product ID: User can view the serial number of this device. It is read-only and unique
23) Version: It displays the version information of this device. Encoder Modulator: the name
of the device; Ver: version number of this device.

10
CHAPTER 4 How to Upgrade
DHM-2057 encoder modulator is embedded with USB Port for upgrading. The supported file
format is IMG.
Upgrade steps: Insert USB device→Upgrade automatically(It will need 10-20 seconds to
upgrade.) →Remove USB device→Power off→Power on.
USB Port for Upgrade

11
Appendix
Australia Air Channels
Australia Air Channels
Ch.
Frequency
Ch.
Frequency
Start
Center
End
Start
Center
End
VHF
C38
596
599.5
603
C39
603
606.5
610
C00
45
48.5
52
C40
610
613.5
617
C01
56
59.5
63
C41
617
620.5
624
C02
63
66.5
70
C42
624
627.5
631
C03
85
88.5
92
C43
631
634.5
638
C04
94
97.5
101
C44
638
641.5
645
C05
101
104.5
108
C45
645
648.5
652
C5A
137
140.5
144
C46
652
655.5
659
C06
174
177.5
181
C47
659
662.5
666
C07
181
184.5
188
C48
666
669.5
673
C08
188
191.5
195
C49
673
676.5
680
C09
195
198.5
202
C50
680
683.5
687
C9A
202
205.5
209
C51
687
690.5
694
C10
209
212.5
216
C52
694
697.5
701
C11
216
219.5
223
C53
701
704.5
708
C12
223
226.5
230
C54
708
711.5
715
C55
715
718.5
722
UHF
C56
722
725.5
729
C57
729
732.5
736
C20
470
473.5
477
C58
736
739.5
743
C21
477
480.5
484
C59
743
746.5
750
C22
484
487.5
491
C60
750
753.5
757
C23
491
494.5
498
C61
757
760.5
764
C24
498
501.5
505
C62
764
767.5
771
C25
505
508.5
512
C63
771
774.5
778
C26
512
515.5
519
C64
778
781.5
785
C27
519
522.5
526
C65
785
788.5
792
C28
526
529.5
533
C66
792
795.5
799
C29
533
536.5
540
C67
799
802.5
806
C30
540
543.5
547
C68
806
809.5
813
C31
547
550.5
554
C69
813
816.5
820
C32
554
557.5
561
C70
820
823.5
827
C33
561
564.5
568
C71
827
830.5
834
C34
568
571.5
575
C72
834
837.5
841
C35
575
578.5
582
C73
841
844.5
848
C36
582
585.5
589
C74
848
851.5
855
C37
589
592.5
596
C75
855
858.5
862
Table 1 Australia Television Frequency/Channels (MHz)

12
Modulation
Constellation
FEC
6MHz Bandwidth
7MHz Bandwidth
8MHz Bandwidth
Guard Interval
Guard Interval
Guard Interval
1/4
1/8
1/16
1/32
1/4
1/8
1/16
1/32
1/4
1/8
1/16
1/32
QPSK
1/2
The weak ability of error-correcting and anti-interference in this area
6.03
2/3
6.03
5.80
6.45
6.83
7.03
6.64
7.37
7.81
8.04
3/4
6.22
6.58
6.78
6.53
7.25
7.68
7.91
7.46
8.29
8.78
9.05
5/6
6.22
6.91
7.31
7.54
7.25
8.06
8.53
8.79
8.29
9.22
9.76
10.05
7/8
6.53
7.25
7.68
7.91
7.62
8.46
8.96
9.23
8.71
9.68
10.25
10.56
16QAM
1/2
7.46
8.29
8.78
9.04
8.70
9.67
10.24
10.55
9.95
11.06
11.71
12.06
2/3
9.95
11.05
11.70
12.06
11.61
12.90
13.66
14.07
13.27
14.75
15.61
16.09
3/4
11.19
12.44
13.17
13.57
13.06
14.51
15.36
15.83
14.93
16.59
17.56
18.10
5/6
12.44
13.82
14.63
15.08
14.51
16.12
17.07
17.59
16.59
18.43
19.52
20.11
7/8
13.06
14.51
15.36
15.83
15.24
16.93
17.93
18.47
17.42
19.35
20.49
21.11
64QAM
1/2
11.19
12.44
13.17
13.57
13.06
14.51
15.36
15.83
14.93
16.59
17.56
18.10
2/3
14.92
16.58
17.56
18.09
17.41
19.35
20.49
21.11
19.91
22.12
23.42
24.13
3/4
16.79
18.66
19.76
20.35
19.59
21.77
23.05
23.75
22.39
24.88
26.35
27.14
5/6
18.66
20.73
21.95
22.62
21.77
24.19
25.61
26.39
24.88
27.65
29.27
30.16
7/8
19.59
21.77
23.05
23.75
22.86
25.40
26.89
27.71
26.13
29.03
30.74
31.67
Table 2 Recommended MPEG-2 Code Rate

13
Declaration of Conformity
Certify and declare under our sole responsibility that the following apparatus:
DHM-2056 DHM-2057 DHM-2058
Conforms with the essential requirements of the EMC Directive 2004/108/EC the
Safety Directive 2006/95/EC and 2001/65/EU RoHS Directive, based on the
following specifications applied:
EU Harmonized Standards: ΕΝ 55022:2010
ΕΝ 61000-3-2:2006+A1:2009+A2:2009, EN61000-3-3:2008
EN:55024:2010
ΕΝ 50083-2:2006, IEC60728-2:2010
EN 61000-4-2:2009, EN61000-4-3:2006+A1:2008+A2:2010
EN 61000-4-4:2012, EN61000-4-5:2006
EN 61000-4-6:2009, EN61000-4-8:2010, EN 61000-4-11:2004
EN 60950-1:2006+A11:2009+A1:2010+A12:2011+AC:2011
Signed
N.Gounalakis Place: Baarle-Nassau
Managing Director Dated:16-02-2015
*QM-products is TM of Digital-Innovations B.V.
*The Technical documentation is kept by the manufacturer