Global Microwave Systems MDT-BF3B Messenger Digital Transmitter User Manual 100 M0101X1 3

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Messenger Digital Transmitter
- Broadcast Version –
MODEL MDT- BF3B
OPERATIONS MANUAL
GMS, Inc.
1916 Palomar Oaks Way, Suite 100
Carlsbad, CA 92008
Tel. (760) 496-0055
Fax (760) 496-0057
www.gmsinc.com
Copyright 200
100-M0101X1 Rev 4-22-08
TABLE OF CONTENTS
1.0
Professionally Installed Device.................................................................................................................4
2.0
Important Warning and General Safety Information............................................................................5
3.0
Acronyms........................................................................................................................................................7
4.0
Introduction .....................................................................................................................................................8
4.1
Key System Features .................................................................................................................................8
5.0
Theory of Operation........................................................................................................................................8
6.0
Hardware Overview ......................................................................................................................................9
6.1
Standard MDT-B .........................................................................................................................................9
6.1.1
MDT-B Connectors .............................................................................................................................9
6.1.1.1
RF Output .....................................................................................................................................9
6.1.1.2
I/O ..................................................................................................................................................9
6.1.1.3
SDI/ASI Input (optional) ...........................................................................................................10
6.1.2
Frequency Select Switches .............................................................................................................11
7.0
Software Overview......................................................................................................................................12
7.1
System Requirements ..............................................................................................................................12
7.2
Installation ..................................................................................................................................................12
7.3
MDL_B Configurator Functions...............................................................................................................12
7.3.1
Function Buttons ...............................................................................................................................14
7.3.2
Field Definitions .................................................................................................................................14
7.3.3
Pull-Down Menu Definitions ............................................................................................................15
7.3.3.1
File...............................................................................................................................................15
7.3.3.2
Configuration..............................................................................................................................15
7.3.3.3
Help .............................................................................................................................................18
8.0
Specifications ..............................................................................................................................................20
8.1
Video Encoding .........................................................................................................................................20
8.2
Audio Encoding .........................................................................................................................................20
8.3
Transport Stream ......................................................................................................................................20
8.4
RS-232 Interfaces/RCU ...........................................................................................................................20
8.5
COFDM RF Output ...................................................................................................................................21
8.6
Modulation..................................................................................................................................................21
8.7
Power ...........................................................................................................................................................21
8.8
Physical Dimensions (without mating connectors)...............................................................................21
8.9
Environmental............................................................................................................................................21
9.0
The D/C (Down Converter)/IF frequencies explained ........................................................................22
9.1
If Frequencies ............................................................................................................................................22
9.2
Local and Remote Power.........................................................................................................................22
10.0
Cable Losses............................................................................................................................................24
10.1
Coax Cable ............................................................................................................................................24
100-M0101X1 Rev 04-22-08
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LIST OF TABLES
Table 1 – Safe distances............................................................................................................................. 6
Table 2 - I/O DB-44 Connector Pin Out ................................................................................................... 10
Table 3 - MDT Field Definitions................................................................................................................ 14
Table 4 - DB-9 Connector Pin Out for the D/C........................................................................................ 23
Table 5 - RG59/U Coax Cable Losses ..................................................................................................... 24
LIST OF FIGURES
Figure 1 - MDT-B Connectors .................................................................................................................... 9
Figure 2 - MDL_B Configurator Main Screen ......................................................................................... 13
Figure 3 - MDT Configurator Main Screen .............................................................................................. 13
Figure 4 - Select MPEG Encoder Profile ................................................................................................. 17
Figure 5 - Others ....................................................................................................................................... 17
Figure 6 - Transport Stream Setup .......................................................................................................... 18
Figure 7 - Channel Rate Guide................................................................................................................. 19
Figure 8 - FW Version ............................................................................................................................... 19
Figure 9 - BDC Connectors ...................................................................................................................... 23
Appendix
Appendix A - Product outline and mounting documentation............................................................... 25
Appendix B – Cable, MDT-B External Breakout for Broadcast Version .............................................. 26
100-M0101X1 Rev 04-22-08
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1.0 Professionally Installed Device
The equipment as provided is intended to be professionally installed. Professional
installers know how to mount the transmitter in an appropriate enclosure with sufficient heat
sinking. In addition only the provided factory accessories such as the antenna and cables
can be used with this device. No substitutions are allowed.
This device is an intentional radiator, hence:
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
NOTE: The manufacturer is not responsible for any radio or TV interference caused
by unauthorized modifications to this equipment. Such modifications could void the
user’s authority to operate the equipment.
This manual provides information on how to operate the MDT-B as well as pertinent
technical information related to the overall system.
100-M0101X1 Rev 04-22-08
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2.0 Important Warning and General Safety Information
The following information is presented to the operator to ensure awareness of potential
harmful RF (radio frequency) exposure and general hazards. With regards to potential
harmful RF electromagnetic fields the text below is only a brief summary highlighting the
possible risks and how to minimize exposure. The summary is based on OET Bulletin 65
“Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency
Electromagnetic Fields” (1). The user should carefully read and comprehend the following
before operating the equipment and for additional in depth information refer to OET Bulletin
65.
1. FCC has set guidelines
(1)
for evaluating exposure to RF emissions that the user must be
aware of when operating GMS’s MDT-B microwave transmitter. The maximum power
density allowed at 5725 – 5850 MHz is 5mW/cm2 for occupational/controlled exposure* and
1mW/cm2 for general population/uncontrolled exposure**. These are the limits for
maximum permissible exposure (MPE) as called out in the FCC guidelines (for the above
mentioned frequencies).
2. Exposure is based on upon the average time spent within the RF field with a given intensity
(field units in mW/cm2). Hence it may be controlled (or at least minimized) by observing the
safe distances and time exposed as shown in Table 1. These safe distances are calculated
from equations predicting RF Fields (3) with the following assumptions:
•
•
•
The transmitter maximum peak power is 29.3dBm (851mW).
The antenna used has a 2dBi gain
The transmitter is used in a fixed location
* “Occupational /controlled exposure limits apply to situations in which persons are exposed as
a consequence of their employment and in which those persons who are exposed have been
made fully aware of the potential for exposure and can exercise control over their exposure.
Occupational/controlled exposure limits also apply where exposure is of a transient nature as a
result of incidental passage through a location where exposure levels may be above general
population/uncontrolled limits (see below), as long as the exposed person has been made fully
aware of the potential for exposure and can exercise control over his or her exposure by leaving
the area or by some other appropriate means. …….” (2)
** “General population/uncontrolled exposure limits apply to situations in which the general
public may be exposed or in which persons who are exposed as a consequence of their
employment may not be made fully aware of the potential for exposure or cannot exercise
control over their exposure. Therefore, members of the general public would always be
considered under this category when exposure is not employment-related, for example, in the
case of a telecommunications tower that exposes persons in a nearby residential area.” (2)
(1)
OET Bulletin 65, Appendix A Table 1 Limits for MPE
http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf
(2)
OET Bulletin 65, page 9, definitions of types of exposure
http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf
(3)
OET Bulletin 65, page 19, Equations for predicting RF Fields
http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf
100-M0101X1 Rev 04-22-08
Page 5 of 26
The user (and bystanders) should remain beyond the distances from the antenna at all times as
stated in Table 1 when the transmitter is operating for no longer than the time periods indicated
(keeping in mind this is the average time).
Table 1 – Safe distances
Frequency = 57255850 MHZ
MDTB Transmitter Peak Power =
29.3 dBm (851mW). *
Antenna Gain =
+2dbi
Occupational /controlled
exposure (5mW/cm2)
General population/uncontrolled
exposure (1mW/cm2)
Safe Distance
Safe Distance
Average Time
10.36 cm
30 minutes
4.64 cm
Average
Time
6 minutes
* NOTE: The peak power of a C-OFDM signal occurs for a short period of time. It is not
continuously present.
3. The transmitter is rated at 29.3 dBm (851mW) peak RF power and is capable of harmful
radiation if safe operating practices are not observed (see sections 1 & 2 above). Average
power is 200 mW (23dBm) except in 64 QAM mode power drops to 100 mW (20dBm).
4. Antenna minimum safe operating distances should be observed as stated in section 2
above. It is the responsibility of the qualified end-user of this intentional radiator to control
the safe distances and exposure limits to bystanders.
5. Electro-Static Discharge (ESD) precautions should be observed as a safe practice.
100-M0101X1 Rev 04-22-08
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3.0 Acronyms
This section lists and describes the various acronyms used in this document.
Name
Meaning
16QAM
64 QAM
A/V
AES
ABS
ASI
C-OFDM
CVBS/Y
D/C
FEC
GUI
I/O
Kbaud
Kbps
Mbps
MDL
MDL-B
MDR
MDR-B
MDT
MDT-B
MER
MPEG
NTSC
PAL
QPSK
RF
RX
S/N
THD
SDI
TX
VDC
16-state Quadrature Amplitude Modulation
64-state Quadrature Amplitude Modulation
Audio/Video
Advanced Encryption System (32 bit)
Messenger Basic Scrambling (8 bit)
Asynchronous Serial Interface
Coded Orthogonal Frequency Division Multiplexing
Composite video/Luminance with S-video
Chroma video
Down-Converter
Forward Error Correction
Graphical User Interface
Input/ Output
Kilobaud per second
Kilobits per second
Megabits per second
Messenger Digital Link
Messenger Digital Link, Broadcast Version
Messenger Digital Receiver
Messenger Digital Receiver, Broadcast Version
Messenger Digital Transmitter
Messenger Digital Transmitter, Broadcast Version
Modulation Error Rate
Moving Picture Experts Group
National Television System Committee
Phase Alternation Line
Quadrature Phase Shift Keying
Radio Frequency
Receiver
Signal-to-Noise Ratio
Total Harmonic Distortion
Serial Digital Interface
Transmitter
Volts (Direct Current)
100-M0101X1 Rev 04-22-08
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4.0 Introduction
The Broadcast version of the Messenger Digital Link (MDL) includes the Broadcast version
of both the Messenger Digital Transmitter (MDT-B), the Messenger Digital Receiver (MDRB), and one or two external Down Converters (sold separately) for frequencies exceeding
the direct input of 861MHz. The MDT-B (Messenger Digital Transmitter, Broadcast version)
also works with any DVB-T compliant receiver.
The Broadcast version of the MDL (Messenger Digital Link) provides professional
Audio/Video (A/V) interfaces and processing. All versions of the MDL use a robust digital
modulation system known as Coded Orthogonal Frequency Division Multiplexed (COFDM)
that provides frequency diversity and powerful Forward Error Correction (FEC) algorithms.
The MDL provides a robust wireless link that is effective against the multipath interference
experienced by analog systems, and provides crisp, clear pictures in the most difficult of
terrains.
Refer to model identifier (on-line document, 100-MNI0031X2) at GMS website,
www.gmsinc.com, for available frequency and power configurations along with available
options.
4.1 Key System Features
•
•
•
•
•
•
•
5.0
SDI, ASI, Component, S-Video & Composite Interfaces
4:2:2 and 4:2:0
Coded Orthogonal Frequency Division Multiplexed (C-OFDM) Modulation
Low System latency (~80ms)
Built-in MPEG-2 Encoder
Companion COFDM Receiver with Maximal Ratio Pre-Detect Diversity Reception.
Rugged and Compact Portable Design
Theory of Operation
The MDT-B Broadcast version accepts either an ASI (Asynchronous Serial Interface,) SDI
(Serial Digital Interface), Component, S-Video or Composite video signal and embedded
audio or analog stereo audio inputs (mic or line level). The video is compressed (ASI data
streams are passed through bypassing the MPEG encoder) according to MPEG-2
specifications. The MPEG-2 supports 4:2:2 or 4:2:0 chroma sampling, 422P@ML, MP@ML
and SP@ML profiles and maintains the original signal’s video fidelity. The audio is
compressed using MPEG Layer II compression. The audio, video and data packet PES
streams are multiplexed with basic service data to indicate the service name and transmitted
across the wireless link.
Additionally, the MDT-B/MDR-B combination employs a specially designed ‘low delay’
coding technology, which provides an end-to-end latency of approximately 80ms without the
introduction of any further MPEG encoding artifacts. This ensures that the picture you see is
what is happening now – crucial for applications such as sports coverage.
100-M0101X1 Rev 04-22-08
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6.0 Hardware Overview
There are two basic transmitter configurations: the standard MDT-B and the inline
professional camera unit (this is an optional enclosure for mounting the standard
MDT- B in professional camera applications). The hardware for each configuration
is shown below:
6.1 Standard MDT-B
“RF OUT” (SMA) Connector
“SDI/ASI Input”
(BNC
Connector)
Frequency
Select Switches.
SW100
DB-44 Connector
(I/O and Power)
Figure 1 - MDT-B Connectors
6.1.1 MDT-B Connectors
There are three connectors located on the MDT-B unit as shown in Figure 2. They are
for interfacing the RF, SDI/ASI, audio, video, power, and RS-232 signals.
6.1.1.1 RF Output
The MDT-B uses a female SMA bulkhead connector for its ‘RF Output’ port.
6.1.1.2 I/O
The ‘I/O’ connector is a male, high-density DB-44. It is used to provide the
interface for external power, audio, analog video and RS-232 signals. The
MDT-B has a separate RS232 channel (labeled “Control” on the external
breakout cable) for control and monitoring the unit. GMS MDLB Configurator
software program (as explained in section 6) makes use of the RS232 control
lines. The RS-232 channel utilizes a 3-wire configuration. The pin out for the
100-M0101X1 Rev 04-22-08
Page 9 of 26
I/O connector is shown in Table 1. NOTE: A USB connector and an additional
RS232 channel ( labeled “DATA”) are currently provided with the external
breakout cable . The USB interface is an alternate method of interfacing to the
PC if DB-9 connectors are not available. The “Data” RS232 channel is
dedicated for low-rate data to be transmitted along with the audio and video.
6.1.1.3 SDI/ASI Input (optional)
A BNC connector is provided for Serial Digital or Asynchronous Digital data
streams.
Table 2 - I/O DB-44 Connector Pin Out
Pin
Signal
RS232 Data Tx
RS232 Data Rx
RS232 GND
Not connected
SDA
SCL
CVBS/Y
GND
C/Pr
10
11
12
13
14
15
16
17
18
19
20-29
30
31
32
33
34-36
37
38
39
GND
Pb
GND
GND
11-15Vdc
Not connected
USB power, Reset
USB Data USB Data +
USB Gnd
Not connected
PA_Shut_DN
RS232 Control Tx
RS232 Control-Rx
RS232 GND
Not connected
Audio right +
Audio right Audio right line opt.
40
41
42
43
Audio right GND
Audio left +
Audio left Audio left line opt
44
Audio left GND
100-M0101X1 Rev 04-22-08
Notes
I^2 C bus
I^2 C bus
Dual use input. 1. Composite video in; 2. Luminance in
(when used with S or Component Video). Must be
selected with GMS Control Software or through the front
panel of the in-line camera mount box
GND for composite video
Dual use input. 1.Chroma video (when used with Svideo); 2. Pr (red component when used with Component
Video). Must be selected with GMS Control Software or
through the front panel of the in-line camera mount box.
GND for chroma video/Pr component
Blue component when used with Component Video.
GND for Pb component
GND
Input power to unit
Provides TTL level [+3V] signal for control of external PA
Pin 39 is connected to pin 38 for audio right channel input
impedance of 600 ohms , balance in (mic or line level)
Pin 43 is connected to pin 42 for audio left channel input
impedance of 600 ohms; balance in (mic or line level).
Page 10 of 26
6.1.2 Frequency Select Switches
There are four external rotary switches mounted into the chassis of the MDT-B
(see Figure 2). They are used to control RF frequency selection. Frequency
selection can also be controlled through GMS control software; see section 6.
The rotary switches can be disable or enable using GMS control software; refer
to section 6.3.3.2 under Configuration/Special Setup/Others. The most
significant switch (SW100) represents 1000MHz (0-9) units, the second switch
(SW101) represents 100MHz (0-9) units, the third switch (SW102) represents
10MHz (0-9) units and the fourth switch (SW103) represents 1MHz (0-9) units.
For example with the switches in the following positions, the frequency will read
5800MHz:
And with the switches in the following positions the frequency will read 5825MHz:
Note the following: if the switches are selected for a frequency outside the
range of the frequency band of the MDT-B: the transmitter will default to
the high side of the frequency band if the switches are set for a frequency
higher than the transmitter frequency band. It will default to the low side of
the frequency band if the switches are set for a frequency lower than the
transmitter frequency band.
100-M0101X1 Rev 04-22-08
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7.0 Software Overview
Configuration, control and monitoring of the MDT-B unit are done by using GMS’ optional
(sold separately) MS Windows-based MDL_B Configurator software program. This
Graphical User Interface (GUI) program provides the end user with a straightforward way to
interface with the MDT-B unit. During normal operation, once a MDL-B link is established,
the MDL_B Configurator GUI does not need to be active and can be disconnected from the
MDT-B unit.
7.1 System Requirements
The MDL_B Configurator program has been developed and tested on Windows 2000,
Windows XP and Windows NT. Although the MDL_B Configurator program may work
properly on other operating systems, only the Windows 2000, Windows XP and
Windows NT environments have been used at GMS and no support or assistance can
be provided concerning other operating systems.
7.2 Installation
The following instructions outline the installation process for the MDL_B Configurator
program:
1. Insert provided CD-ROM into computer.
2. Click on ‘setup.exe’ file. This will launch the GMS_MDL Setup program and
several initial setup files will begin to be copied onto the computer.
3. After the initial setup files are copied over, the GMS_MDL Setup program will
prompt the user to close any applications that are running. Once all other
programs are exited, click on the ‘OK’ button.
4. The GMS_MDL Setup program will prompt the user to click on the ‘computer
icon’ button to begin installation. If desired, the user can change the destination
directory from the default. Click on the ‘computer icon’ button.
5. The GMS_MDL Setup program will then prompt the user to ‘Choose Program
Group’. If desired, the user can change the program group from the default.
Click on the ‘Continue’ button.
6. After quickly installing the MDL Configurator program, the GMS_MDL Setup
program will put up a window indicating that setup was completed successfully.
Click ‘OK’.
7.3 MDL_B Configurator Functions
The MDL_B Configurator program provides the user access to many different
configuration, control and monitoring options. When the MDL_B Configurator program is
launched, the screen shown in Figure 4 is displayed. The user should first select the
serial port their computer is connected to via the Serial Port Selector and Status region.
If the selected serial port is valid, the gray-colored status box will show ‘Ready’. The
Device Selector region allows the end user to choose to interface to a MDT-B or MDR-B
unit. To configure a MDT-B, select the ‘MDT-B’ box in the Device Selector region. Once
the ‘MDT-B’ box is selected, the screen shown in Figure 5 is displayed. The MDT-B
Configurator program contains function buttons and all the configurable settings
available on a MDT-B. The following sections explain, in detail, the various options.
100-M0101X1 Rev 04-22-08
Page 12 of 26
Figure 2 - MDL_B Configurator Main Screen
5800
Figure 3 - MDT Configurator Main Screen
100-M0101X1 Rev 04-22-08
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7.3.1
Function Buttons
•
“Enable All” Button: Clicking on this button enables all the check boxes on the
screen. This operation is done to prepare all the fields to be written to (or read from).
Alternatively, the end user can individually select a given field by using the mouse
and clicking its corresponding check box.
•
“Disable All” Button: Clicking on this button disables all the check boxes on the
screen. This operation is done to inhibit all the fields to be written to (or read from).
Alternatively, the end user can individually deselect a given field by using the mouse
and clicking its corresponding check box.
•
“Query” Button: Clicking on this button performs a read operation on all the fields
that have their check box enabled. Once clicked, all the selected fields will be read
back reflecting their current configuration.
•
“Update” Button: Clicking on this button performs a write operation on all the fields
that have their check box enabled. Once clicked, all the selected fields will be written
to with the value denoted in their respective field.
•
“CLR” Button: Clicking on this button clears out all fields on the screen, regardless
of whether the fields’ check boxes are selected or not. This button proves useful
when the end user wants to verify that a write operation has been correctly
performed. An example scenario would be to 1) enable all fields, 2) change desired
field(s), 3) perform a ‘Update’ (write) operation, 4) perform a ‘CLR’ operation and 5)
perform a ‘Query’ operation. As a result of the ‘Query’ operation, the fields on the
screen should all update to those values that were written during the ‘Update’
operation.
•
“Store All Setup Pages” Button Clicking on this button will store all setup pages,
even if they are not shown.
7.3.2 Field Definitions
There are several different fields that can be configured by the MDT-B Configurator.
The fields located in the main screen of Figure 5 and their associated values are
defined in Table 3 below. Also noted in the table is whether the field is read, writeable or both
Table 3 - MDT Field Definitions
Field
Unit Name
Unit Number
RF Freq (MHz)
100-M0101X1 Rev 04-22-08
R/W
R/W
R/W
R/W
Description
Allows the user to assign a unique unit name to the
MDT.
Allows the user to assign a unique unit number to the
MDT
RF output frequency. Desired frequency is entered in
MHz (i.e., 5.800 GHz would be entered as 5800).
Page 14 of 26
Field
Modulation
Mode
R/W
R/W
C-OFDM
Bandwidth
C-OFDM Mode
R/W
R/W
Mod Guard
Interval
R/W
Modulation FEC
R/W
Channel Rate
(Mbps)
Input Mode
R/W
Video Input
R/W
Video Locked
Status
Audio Enable
R/W
Audio Mute
Audio Level
Audio Gain
R/W
R/W
R/W
Description
Modulation mode. Desired modulation mode is
selected from the following values: C-OFDM (default)
Off (shuts off modulation) or I/Q CAL ON (puts unit in
calibration mode).
C-OFDM transmit bandwidth. Desired bandwidth is
selected from the following values: 6, 7 or 8 MHz.
C-OFDM modulation type. Desired C-OFDM
modulation type is selected from the following values:
QPSK, 16QAM or 64QAM
Modulation guard interval size. Desired modulation
guard interval size is selected from the following
values: 1/32, 1/16, 1/8 or ¼.
Modulation FEC (Forward Error Correction) rate.
Desired modulation FEC rate is selected from the
following values: ½, 2/3, ¾, 5/6, 7/8.
Channel rate is displayed based on parameters
selected such as COFDM mode, FEC and Guard
Interval.
Choice between Analog video, SDI (serial digital
interface) or ASI (asynchronous digital interface)
Video input format. Desired video input format is
selected from the following values: PAL, NTSC w/
Pedestal, NTSC, S-video PAL, S-video NTSC, and
Component Video. Some of these choices may or may
not be shown in the pull down box depending on which
user profile has been loaded.
Analog video lock status. This read-only field indicates
that the MDT-B has line-locked onto the analog video
input signal [not applicable when the “Input Mode” is
set to either SDI or ASI]
Analog audio encoder enable. Desired mode of
operation of the audio encoder is selected from the
following values: Off or On.
Choice between mute or un-mute audio stream
Choice between mic or line level audio
Adjustable gain between 0- 100
Not applicable for embedded audio applications.
7.3.3 Pull-Down Menu Definitions
There are several different pull-down menus that are included in the MDT-B
Configurator program. Each of these pull-down menus contains further userconfigurable options or commands. The following sections describe these menus in
detail.
7.3.3.1 File
This pull-down menu offers to exit the MDT-B Configurator program or to “Save
Parameters”. Alternatively the ‘X’ box in the upper right hand corner of the
window can be used to exit the program. And alternatively the “Store All Setup
Pages” button on the main menu will save all parameters.
7.3.3.2 Configuration
This pull-down menu contains several different configuration options. These are
outlined below:
100-M0101X1 Rev 04-22-08
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 Special Setup
o Load MPEG Encoder Profile (see figure 4) – This menu displays the
current profile loaded and also presents possible profiles to load.
Select the profile from the pull down box (or use the browse button to
point to area where other profiles are located). Then click on the
“Download Profile” button. A progress bar appears which shows the
profile loading. After the profile has been downloaded it’s necessary to
click on the “Store all Setup” button for the profile to be saved. Once
the profile is stored a message box appears indicating the profile is
stored. If the message box states the process failed then click on the
“Store All Setup” button again. Repeat until the message box
indicates the profile is stored.
o Others (see figure 5)- This menu displays the following:
 COFDM Spectrum Inversion choices include normal or
invert. The transmitter is configured with the receiver it ships
with and the inversion mode shouldn’t have to be changed.
However if a different receiver is used the inversion mode may
have to be changed. Some receivers will accept either
inversion mode. Check the parameters of the receivers to
ensure the correct inversion mode is selected.
 Frequency switch – choices offered are enabled or disabled.
These are the four frequency select switches discussed under
section 5.1.1.3. If disabled the switches will not respond to
changes (frequency changes could still be accomplish by
changing the “RF FREQ (MHz”) field in the GMS MDLB control
software. Enabling them allows the frequency to be changed
when the switches are changed. Factory default enables the
switches (keep in mind that you must click on the “Store All
Setup Pages) for the choice to take place.
 Video Filter Type-Pull down box offers various filter types for
optimizing picture. The choices include: LPF OFF, LPF C, LPF
Y, and LPF YC.
 Video Filter Frequency- Pull down box offers various filter
frequencies for optimizing picture. The choices include: AUTO,
12.15MHz, 10.6MHz, 9.45MHz, 8.1MHz and 6.75MHz.

 Transport Stream (see figure 6) – The transport stream menu displays the
parameters of the current transport stream (of the transmitter). The fields are
read/write-able. Normally the fields require no manipulation and should work
quite well as defaulted from the factory. However, high end users may have a
need to change the transport stream parameters.

 Ctrl Port Baud Rate- The control port baud rate menu allows different baud
rates to be selected when attached to the PC RS232 port. Some computers
may need the baud rate adjusted for optimal communications

 Factory Setup – The menu is for factory use only.
100-M0101X1 Rev 04-22-08
Page 16 of 26
Figure 4 - Select MPEG Encoder Profile
Figure 5 - Others
100-M0101X1 Rev 04-22-08
Page 17 of 26
Figure 6 - Transport Stream Setup
7.3.3.3 Help
This pull-down menu contains information about the MDT firmware and the MDL
Configurator software. This information is outlined below:

 Channel Rate Guide: This selection pulls up a table which displays the
relationship between the Modulation mode, Modulation Guard Interval and
FEC mode. Table values will change depending on COFDM Bandwidth
selected. See figure 7.

 FW version: This selection pulls up a window that displays the MDT-B
current Profile Index (current loaded profile), the Profile Description, the
Software Version, the FPGA Version and Serial Number. See Figure 8.

 About: This selection pulls up a window that displays the Version Number of
the GMS MDL_B Configurator program.
100-M0101X1 Rev 04-22-08
Page 18 of 26
Figure 7 - Channel Rate Guide
Figure 8 - FW Version
100-M0101X1 Rev 04-22-08
Page 19 of 26
8.0 Specifications
The following sections outline the overall specifications for the MDT unit.
8.1 Video Encoding
Interfaces: SDI, Component, Composite or S-Video Input
Standards: NTSC or PAL
Compression Standard: MPEG-2 (per ISO/IEC 13818-2)
Profiles: 422P@ML, MP@ML, SP@ML
Video Bit Rate: 2Mbps to 15Mbps (MP@ML)
3Mbps to 25Mbps (422P@ML)
Chrominance Profile: 4:2:2 or 4:2:0
Line Standard: NTSC: 525 or 480
PAL: 625 or 576
Horizontal Resolution: 720 pixels
Vertical Resolution: 480 (525 line) and 576 (625 line)
System Latency end to end delay: <80ms (super low latency mode)
8.2 Audio Encoding
Analog Audio: Dual, Line-Level or Mic-Level, Differential or Single-Ended, Clip
Level 12dBm
Impedance: 600 Ohms input impedance (changeable to 2K Ohms)
Compression Standard: MPEG layer II
Audio Enable: On or Off
Bit Rates: Up to 384kbit/s/ch
Sampling Frequency: 32kHz, 44.1kHz or 48kHz
THD: < 0.1% maximum
Response: 20Hz to 12kHz, +/- 0.25dB
Crosstalk: >55dB minimum
S/N: >60dB RMS
8.3 Transport Stream
Standard: per ISO/IEC 13818-1
Packet Size: 188 byte
Bit Rate: Automatically set from active service settings.
ASI Input: Allows MPEG2 transport stream to be inserted into the MDT-B through
the BNC connector
8.4
RS-232 Interfaces/RCU
Control Port: 3-wire interface (Tx,Rx,Gnd)
RCU A remote portable control unit is also available
Note: A USB interface is also available that serves the same purpose as the RS232
control port. In addition a “Data” RS232 channel is available which is dedicated for
low-rate data to be transmitted along with the audio and video.
100-M0101X1 Rev 04-22-08
Page 20 of 26
8.5 COFDM RF Output
Output Frequency: 5725 – 5850 MHz
Frequency step size is 1 MHz
Bandwidth: Selectable 6, 7 or 8 MHz
Output Power: 851mW (29.3 dBm) peak power. Average power is 200 mW (23
dBm) except in 64 QAM mode power drops to 100 mW (20 dBm).
Connector: SMA-F
Note: Transmitters should not be powered on without a load. Doing so could
cause the output PA to stop working. A proper heat sink is also required.
8.6 Modulation
Modulation Type: C-OFDM w/ QPSK, 16 QAM or 64 QAM
FEC: ½, 2/3, ¾, 7/8
Guard Intervals: 1/32, 1/16, 1/8, 1/4
Spurious: 50dBc
Number of C-OFDM Carriers: 2k
C-OFDM MER: > -45dB
Standard: DVB-T compliant
8.7 Power
DC Input Voltage Range: 9 to 15 VDC
Power Consumption: 10Watts
8.8 Physical Dimensions (without mating connectors)
Size: 3.25 in. (W) x 4.5 in. (D) x 1.76 in. (H)
(8.26 cm x 11.43cm x 4.47cm)
Weight: 13.4 oz
(380.5grams)
8.9 Environmental
Operational Temperature: -10 to +70 °C
Humidity: Up to 100% (non-condensing)
100-M0101X1 Rev 04-22-08
Page 21 of 26
9.0 The D/C (Down Converter)/IF frequencies explained
9.1
If Frequencies
•
MDR-B receivers (and many other digital receivers) are capable of receiving direct
frequencies in the range of approximately 49MHz to 861MHz. If the transmitter is not in
this range then a down-converter is used to convert the frequency to this range. The
frequency out of the down-converter is called the IF (intermediate frequency) which is
fed to the receiver.
Down-converters have a LO (local oscillator) which is mixed with the transmitter
frequency (MDT-B) and converts it to the IF frequency. MDR-B receivers need to know
the LO (local oscillator) of the down-converter and is factory programmed with this
information. It then automatically calculates the IF frequency once the RF (transmitter
frequency) is entered. Thus as the desired RF frequency is dialed in on the MDR-B the
IF is taken care of automatically. For example, if the transmitter frequency (MDT-B) is
set for 2000MHz, then the MDR-B can be set for 2000MHz (it automatically calculates
the IF frequency based on pre-programmed LO information of the down-converter). The
IF frequency changes as the RF frequency changes, the LO remains constant.
On non-GMS receivers it may be necessary to program the receiver with the IF frequency
directly. The user may have to do the simple math to arrive at the IF frequency so that it
can be entered into the receiver. The down-converter LO must be known. The math
involve is as follows: “ LO – transmitter frequency (or transmitter frequency – LO) = IF
frequency”. For example, it the transmitter is set for 5800MHz and the LO of the downconverter is 5200MHz then the IF frequency is 600MHz (5800-5200 = 600). The receiver
will need to be set to 600MHz to receive the transmitter frequency of 5800MHz. Each time
the transmitter frequency is changed the IF must be re-calculated and entered into the
receiver. It must also be mentioned, as you may have noticed with the equation “LOtransmitter frequency or transmitter frequency – LO” that two answers are possible. For
example 5800-5200 = 600 or 5200-5800 = -600. The negative answer may indicate the
receiver wants the signal to be inverted. See section 6.3.3.2 for inverting the signal.
9.2
Local and Remote Power
Customers have the option of using remote or local power:
• Remote power is provided from the receiver through the BNC connector IF IN #1 located on
the rear panel (and IF IN #2 in the case of diversity systems with two down converters). IF
PWR # 1 (and IF PWR #2 in case of diversity systems) needs to be switched ‘ON’. From
the front control panel of the receiver (MDR-B) toggle through the menus until “R1 BDC
POWER DISPLAY’ (or “R2 BDC POWER DISPLAY” in the case of diversity systems) is
displayed. Ensure “ON” is selected (this the default mode when shipped with D/C .The
+12Vdc provided from the receiver will travel through the coax cable to the D/C.
If the D/C is located relatively close to the receiver then using remote power makes sense.
However, if the D/C is located at great distances away from the receiver there may be
excessive DC voltage drop in the coax cable (due to cable resistances). If this is the case
then local DC power should be considered as discussed below. If unsure of the DC voltage
drop measure the DC voltage present (using a DMM) at the end of the coax cable run. The
D/C normal operating voltage is approximately +12Vdc but can operate down to +10Vdc.
100-M0101X1 Rev 04-22-08
Page 22 of 26
•
Local power is provided by applying +12Vdc to pin 1, GND to pin 3 of the DB-9 connector
located on the bottom of the D/C. The +12 Volt power supply must be able to source at
least 500mA. The power switch (located on the side of the D/C) enables the user to control
the ‘ON’/’OFF’ positions for local power. If using local power then the remote power IF IN #1
should be set to “OFF” (and RF IN #2 in case of diversity systems).
Power Switch
for local power
RF Input
BNC connector – IF frequency output
DB-9 connector for local power
Figure 9 - BDC Connectors
Table 4 - DB-9 Connector Pin Out for the D/C
Pin
2, 4-9
100-M0101X1 Rev 04-22-08
Signal
+12Vdc
GND
NC
Notes
Power supply must be able to source at least 500mA.
Voltage should not drop below +10Vdc.
Power ground
Not Connected
Page 23 of 26
10.0 Cable Losses
10.1 Coax Cable
Cable losses must be taken into consideration if the D/C is located a great distance from
the receiver. As mentioned above long cable runs can contribute to more resistance in the
lines and also can contribute to signal attenuation because of the additional capacitance.
Even when using a good coax cable such as RG59/U the attenuation of the signal can be
significant. For example, RG59/U coax will drop approximately 2dB per 100 feet at 50MHz
and 8dB per 100feet at 900MHz. The intermediate frequency (IF) in this system can fall
between 49MHz to 850MHz. Cable losses in this range for an RG59/U are shown below
in table 5. An inline amplifier matching the cable losses should be considered if losses
exceed 6dB.
Table 5 - RG59/U Coax Cable Losses
•
Belden cable # 1426A
100-M0101X1 Rev 04-22-08
Page 24 of 26
Appendix A - Product outline and mounting documentation
100-M0101X1 Rev 04-22-08
Page 25 of 26
Appendix B – Cable, MDT-B External Breakout for Broadcast Version
REVISIONS
NOTES:
1. REFERENCE BOM 780-C0224X1 FOR REFERENCE DESIGNATIONS (SHOWN AS [] ON DRAWING) AND PART DESCRIPTIONS .
2 LABEL FINAL CABLE ASSEMBLY WITH PART NUMBER 780-C0224X1 USING BEST COMMERCIAL METHOD.
3 LABEL CONNECTOR WITH REFERENCE DESIGNATOR AND DESCRIPTION AS SHOWN USING BEST COMMERCIAL METHOD. LABEL TO
BE WITHIN 3.0 OF CONNECTOR.
4 REFERENCE MANUFACTURING INSTRUCTION 100-MI0112X1.
ECO
REV
DESCRIPTION
DATE
E0355X1
X1
INITIAL RELEASE
01/19/04 SLP
E0422
X2
Correct polarity marks of USB, pins17&18
APPROVED
11/9/05 TG
5 THIS CABLE IS SET-UP FOR BALANCED AUDIO ONLY.
P100
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
DATA-TX
RED
DATA-RX
WHT
GND
BLK
N/C
N/C
N/C
CVBS/Y
GND
C/Pr
GND
Pb
GND
GND
BLK
RED
11-15VDC
N/C
RED
USB RESET
WHT
USB DATA USB DATA +
GRN
BLK
USB GND
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
RED
CTRL-TX
CTRL-RX
WHT
GND
BLK
N/C
N/C
N/C
AUDIO1 (RIGHT) +
AUDIO1 (RIGHT) -
RED
WHT
BLK
P3
DATA 3
W5
W1
P1 CVBS/Y
W2
P2 C/Pr 3
P7 Pb 3
W4
W3
USB
BLK
J1
RED
J2
DC
POWER
USB 3
W6
RED
WHT
BLK
W7
W7
RED
GND
AUDIO2 (LEFT) +
AUDIO2 (LEFT) -
RED
BLK
GND
GND
P4
CTRL 3
P5
AUDIO1 3
P6
AUDIO 2
W7
BLK
RED
BLK
GND
W7
BLK
W7
RED
RED
BLK
RED
BLK
GND
GND
FIGURE 1
CABLE WIRING
DIAGRAM
TOLERANCES
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
DO NOT SCALE DRAWING
LINEAR
X.X = ± 0.5
X.XX = ± 0.125
X.XXX = ± 0.020
100-M0101X1 Rev 04-22-08
ENG/TECH
DRAWN
ENG
PROD
QC
T. Giotta
gnd/shield
DWG TITLE
SLP
CABLE, MDT2-B EXTERNAL BREAKOUT FOR
BROADCAST VERSION
SIZE
DATE
DWG NO
11/9/05
100-C0224X2
SCALE:
NONE
SHEET
REV
X2
1 OF 5
Page 26 of 26

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