COBHAM M2ECHPT Operation Manual
Messenger 2 Enhanced Compact High-Power Transmitter
(M2ECHPT)
Includes VEPA or Standard Power Amplifier
OPERATIONS MANUAL
100-M0177X1
GMS Inc. doing business as Cobham Tactical Communications and Surveillance
1 of 40
Cobham Tactical Communications and Surveillance
1916 Palomar Oaks Way, Suite 100, Carlsbad, CA 92008
Tel: 760-496-0055
FAX: 760-496-0057
www.cobham.com/tcs
100-M0177X1
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GMS Inc. doing business as Cobham Tactical Communications and Surveillance
www.cobham.com/tcs
Table of Contents
1.
Important Warning and General Safety Information ............................................................... 5
Acronyms ....................................................................................................................................... 7
2.
Introduction ................................................................................................................................ 8
2.1
About the Manual ......................................................................................................... 8
2.2
Warranty ...................................................................................................................... 8
2.3
Safe Operating Procedures ......................................................................................... 8
3.
General System Information ..................................................................................................... 9
3.1
Overview ..................................................................................................................... 9
3.2
Applications ................................................................................................................. 9
3.3
Key System Features ............................................................................................................ 9
3.4
Theory of Operation ................................ ................................ ................................ ... 10
3.5
Power Amplifiers (Standard or VEPA) ........................................................................ 13
3.6
Included Items ........................................................................................................... 13
4.
Hardware Overview .................................................................................................................. 14
4.1
Front Panel ................................................................................................................ 14
4.2
Rear Panel........................................................................................................................... 15
4.3
M2ECHPT Connectors .............................................................................................. 15
4.3.1
RF Output. ................................................................................................................................. 15
4.3.2
DC IN ............................................................................................................................... 16
4.3.3
DATA/CONTROL ...................................................................................................................... 16
4.3.4
Audio ............................................................................................................................... 17
4.3.5
Video1/Video 2 (SDI input, Composite input & ASI input) ................................................... 17
4.3.6
ASI OUT............................................................................................................................... 17
4.3.7
KLV TIME SYNC IN. ...................................................................................................................... 18
5.
Software Overview ................................................................................................................... 19
5.1
Product Control & Status Monitoring Approach .......................................................... 19
5.2
System Requirements ............................................................................................... 19
5.3
Connection ................................................................................................................ 19
6.
Initial Check Out ....................................................................................................................... 24
6.1
Getting Started .......................................................................................................... 24
7.
Specifications ........................................................................................................................... 26
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List of Tables
Table 1 DC IN .............................................................................................................................................
16
Table 2 DATA/CONTROL ............................................................................................................................................. 16
Table 3 Audio Connections ...............................................................................................................................
List of Figures
Figure 1 M2ECHPT Link ............................................................................................................................ 11
17
Figure 2 Content Collection Format ................................................................................................ . 12
Figure 3 M2ECHPT Front View ...................................................................................................... 14
Figure 4 Rear Panel Connectors ..................................................................................................... 15
Figure 6 Welcome Page .................................................................................................................. 20
Figure 7 Windows Security Login .................................................................................................... 20
Figure 8 MAIN Page – LAN Interface ............................................................................................... 21
Figure 9 Configuration Groups Menu ............................................................................................... 22
Figure 10 High Power Link Setup .................................................................................................... 25
Figure 11 Interfacing PC to M2ECHPT ............................................................................................ 32
Figure 12 Window’s Start Button ......................................................................................................... 33
Figure 13 Control Panel w/Network & Internet Category .................................................................. 34
Figure 14 Network Adapter Settings ................................................................................................ 35
Figure 15 Local Area Connection Icon ............................................................................................. 36
Figure 16 Internet Protocol Version 4 .............................................................................................. 37
Figure 17 IP Address Setup ....................................................................................................................... 38
Figure 18 Entering a Static IP addresss ........................................................................................... 39
List of Appendices
Appendix A - IP Static Addressing and Interfacing to a Personal Computer .....................................................
A.1.
Static Addressing ................................................................................................................................
A.2.
DHCP (Dynamic Host Configuration Protocol) ..........................................................................
32
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Revision
Date
Main Changes from Previous version
Edited by
Checked
X1
29 June 2012
Initial Release
T.G.
Revision History
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1. 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”
before operating the equipment and for additional in depth information refer to OET Bulletin 65.
(1)
. The user should carefully read and comprehend the following
1.
FCC has set guidelines
(1)
for evaluating exposure to RF emissions that the user must be aware of
when operating the microwave transmitter. The maximum power density allowed at 1500–
100,000 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 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. Safe distances are calculated from equations predicting RF Fields
3.
The transmitter is capable of harmful radiation if safe operating practices are not observed.
(3)
.
*”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……..”
** “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.“
(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
4.
Antenna minimum safe operating distance is 20cm (8 inches). It is the responsibility of the
(2)
(2)
qualified end-user of this intentional radiator to control the safe distances and exposure limits to
bystanders.
5.
Do not substitute any antenna for the one supplied or recommended by the manufacturer. The
installer is responsible for ensuring that the proper antenna is installed.
6.
It should be noted that this device is an intentional radiator, hence:
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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.
7.
DC power to the unit should never be applied until the antenna (or other suitable load) has been
attached to the RF output connector. Safe operating procedures must be observed when unit is
transmitting into an antenna (see sections 1 &2 above).
8.
Electro-Static Discharge (ESD) precautions should be observed as a safe practice.
9.
The transmitter will generate considerable heat and is the responsibility of the end user to properly
heat sink the device before using.
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Acronyms
Name
Meaning
16 QAM
16-state Quadrature Amplitude Modulation
64 QAM
64-state Quadrature Amplitude Modulation
A/V
Audio/Video
AES
Advanced Encryption System (32 bit)
ASI
Asynchronous Serial Interface
BDC or BDCC
Block down converter
COFDM
Coded Orthogonal Frequency Division Multiplexing
CVBS/Y
Composite video/Luminance with S-video
C Chroma video
D/C
Down-Converter
FEC
Forward Error Correction
GUI
Graphical User Interface
HD High Definition
I/O
Input/ Output
Kbaud
Kilobaud per second
Kbps
Kilobits per second
Mbps
Megabits per second
MER
Modulation Error Rate
MPEG
Moving Picture Experts Group
MSR
Messenger Smart Receiver
M2D
Messenger Two Decoder
M2T
Messenger Two Transmitter
M2L
Messenger Two Link
NTSC
National Television System Committee
PAL
Phase Alternation Line
QPSK
Quadrature Phase Shift Keying
RF Radio Frequency
RX Receiver
S/N
Signal-to-Noise Ratio
THD
Total Harmonic Distortion
SD Standard Definition
SDI Serial Digital Interface
TX Transmitter
VDC
Volts (Direct Current)
VEPA
Very Efficient Power Amplifier
This section lists and describes the various acronyms used in this document.
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2. Introduction
2.1
About the Manual
Cobham User Manuals focus on providing the end user an easy to understand operational instructions
to quickly setup and deploy the equipment. The Cobham Technical Operation Manuals focus on the
technical details and setup of the equipment. The Technical Manuals also provide a more in depth
explanation of the settings and specifications of the equipment that technicians can use to verify the
operational status.
2.2
Warranty
Cobham offers a 12 month standard product warranty. During this period, should the customer
encounter a fault with the equipment we recommend the following course of action:
Check the support section of the website for information on that product and any
software/firmware upgrades.
If fault persists call our support line and report the fault. If fault persists and you are informed to
return the product, please obtain an RMA number from the Cobham support department or
website and ship the equipment with the RMA number displayed and a description of the fault.
Please email the support section the airway bill/consignment number for tracking purposes.
Depending on the nature of the fault, Cobham strives to repair the equipment and return it to the
customer within 14 days of the item arriving at our workshops. Obviously it is impossible to
accommodate for all types of faults and to manage 100% replacement part availability; delays are
sometimes inevitable.
Please contact Cobham for details of packages that can be tailored to meet your individual needs,
whether they are service availability, technical training, local geographic support or dedicated spares
holdings.
2.3
Safe Operating Procedures
Ensure that the power supply arrangements are adequate to meet the requirements of
M2ECHPT product.
Operate within the environmental limits specified for the product. The transmitter will generate
considerable heat and it is the responsibility of the end user to properly heat sink the device
before using.
Electro-Static Discharge (ESD) precautions should be observed as a safe practice.
Only authorized, trained personnel should open the product. There are no functions that
required the User to gain access to the interior of the product.
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3.
General System Information
3.1
Overview
The M2ECHPT is a second generation AVC HD/SD COFDM transmitter that combines all the features
and capabilities of Cobham Surveillance’s (CS’s) Messsenger 2 AVC HD/SD Transmitter with the
additional features listed in the Key System Features section below. Key features include optional Dual
Audio/Video/Data processing with end to end system-level latencies of down to~44mS when used with
CS Receiver/Decoders.
The Ultra-low system latency greatly enhances real-time operating when the link is used in time critical
situations like piloting Unmanned Aerial Vehicles (UAVs) or Unmanned Ground Vehicles (UGVs) or in
threat response. Optional Dual video processing enables 3D content collection which provides depth
perception and greater control for UGV applications requiring fine spatial operations like explosive
device de-arming. The M2ECHPT’s 3D capability also enhances Entertainment, Sports, and ENG
applications.
The M2ECHPT can optionally provide time-correlated KLV-1 and KLV-2 META data processing1 that is
used in Airborne Surveillance Applications and Geospatial determination. The META data can be
extracted from the SDI/HD-SDI video’s ancillary data space or input on a separate RS-422 interface.
3.2
Applications
The M2ECHPT Transmitters can be used in the following environments:
Helicopter Links
UAV/UGV Applications
Audio/Video Surveillance
Airborne/Ground Surveillance
3.3
Key System Features
Up to 15W Linearized Output Power
AVC HD/SD Encoder (up to 1080p 30FPS)
Supports Dual Audio/Video/Data programs
o Multi-Camera Support
o 3D Support
o Dual 3Gbps HD-SD/SDI and Analog SD Video Input Interfaces Option
Robust Link Performance with COFDM Modulation (DVB-T 2K or 4K3 carriers)
Bandwidths DVB-T 6,7, & 8 MHz (STD) & 12, 14 & 16 MHz (4K3)
Dual L/S Band Capability
No External Heat Sink Required
Output Frequency: 0.9 to 7 GHz (In-Bands)
Low System Latency (~44mS)
4,5
Secure Scrambling Encryption Option (128/256-bit AES-C)
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Analog and Embedded Audio
Transport Stream Steaming via LAN or ASI or Serial Interface
User Data Option
Control via LAN Web Server or Serial Interface
+12Vdc or +28Vdc Option
Companion COFDM Receiver with Post-Detect Diversity Reception
3.4
Theory of Operation
The M2ECHPT Series “Messenger Two Series” product line incorporated AVC/H.264 compression
technology with ultra-low delay that covers all the SD and HD formats up to 1080p. AVC compression
provides dramatically increased compression efficiency over MPEG-2 which allows our link to provide
superior coverage over a wider operating range!
There are two core hardware configurations for M2ECHPT. The SD/HD-SDI configuration accepts up to
two Standard Definition (SD) or High Definition (HD) 4:2:2 Digital Video (SD/HD SDI) or analog
composite Video and Analog Stereo Audio Inputs (Mic or Line Level) and Embedded Audio (up to a
total of two stereo pairs or four mono channels) set or programs. Mic bias is also provided. In the
HDMI configuration
*P4
, the SDI/HD-SDI interfaces are replaced with two HDMI interfaces that accept
both digital video and audio. Dual SD Composite Video inputs are also provided with the HDMI
configuration
Both Video programs can be compressed according to the Advanced Video Compression (AVC)/H.264
(HD/SD) specification with the same or different frame resolutions, rates and formats. The low-latency
AVC Encoder supports the Baseline Profile with extensions with resolutions from 480 to 1080 with
support for either interlaced or progressive formats. The Audio is compressed using MPEG-1 Layer 2
compression. Low rate user data up to 115KBaud can be optionally supported. Both programs, Audio,
Video and User Data Packets PES Streams are multiplexed with Basic Service Data to indicate their
respective Service Names. If two programs are active, the two transport steams are multiplexed into a
single multi-program stream. The stream can be optionally scrambled with AES scrambling system to
provide protection in sensitive applications. User selections for all transport stream ID numbers and
service names are provided.
The M2EPHT is a complete system with Audio/Video encoders/compressors and all the required
processing to transmit the modulated signal with up to 15W (band dependent). CS’ COFDM wireless
equipment provides a standard robust digital modulation system known as Coded Orthogonal
Frequency Division Multiplexed (COFDM) that provides frequency diversity and powerful Forward Error
Correction (FEC) algorithms. This modulation is ideal for transmitting over water or into urban
environments which typically have high multi-path interference.
Our Messenger Receivers include an option for Spatial Maximal Ratio Pre-Detect Diversity to combat
multipath reflections found in indoor/urban environments. Cobham’s Messenger six or eight channel
receivers with associated Messenger Antenna Arrays (MAAs) provide wide reception range without the
hassle and cost of an auto tracking antenna system. The Messenger series Tx/Rx products provide a
robust wireless link that is effective against the multipath interference experienced by analog systems
and provides reliable data transmission in the most difficult of terrains.
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Messenger Antenna Array
Messenger Smart Receiver
M2TE inside 10W Tx
Messenger 2 AVC HD/SD Decoder
Figure 1 M2ECHPT Link
In 2K Mode the M2ECHPT uses standard DVB-T coding and modulation. DVB-T stands for Digital Video
Broadcasting — Terrestrial; it is the DVB European-based consortium standard for the broadcast
transmission of digital terrestrial television that was first broadcast in the UK in 1997. This system
transmits compressed digital audio, video and other data in an MPEG transport stream, using coded
orthogonal frequency-division multiplexing (COFDM or OFDM) modulation.
The OFDM scheme works by splitting the digital data stream into a large number of slower digital
streams each of which digitally modulate a set of closely spaced adjacent carrier frequencies. COFDM
goes a step further by using a “Coding” scheme to map the data onto the multiple carriers in a way that
maximizes recovery from link errors. This coding includes Forward Error Correction with Convolution
Interleaves’ and Reed Solomon encoding along with careful distribution of the data onto the multiple
carriers. COBHAM has chosen to use 2K carrier in which 1,705 carriers actually carry the payload that
are approximately 4KHz apart. DVB-T offers three different modulation schemes (QPSK, 16QAM,
64QAM).
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4K Carrier Mode
The 4K HIGH-THROUGHPUT OPTION enables user-selectable options to set bandwidths from 6 MHz to
16 MHz and to double the throughput of our standard M2T (Up to 63 Mbps!). In 2K carrier mode the
system would need to operate in 64-QAM to support dual program/video operations. Using 4K carriers
and the 16 MHz bandwidth, the link can support dual program/video HD operation using 16 QAM. This
increases link robustness and provides an additional 13.5 dB of gain with a link margin increase greater
than 4.7 x in operating range! for the same throughput rate in a standard HD MPEG-2 DVB-T system!
With the 4 K HIGH-THROUGHPUT OPTION you can run with fully DVB-T compliant 2K carriers and
bandwidths of 6, 7, or 8 MHz. When you switch to 4K carriers you can select 12, 14 or 16 MHz
bandwidth.
LAN/IP Port
The M2ECHPT contain a 10/100BaseT LAN interface that can be used both for Control & Status
monitoring and for Transport Stream (TS) streaming in and out of the device. The IP address can be
assigned automatically via a DHCP server or assigned a Static IP address. Control & Status monitoring is
accomplished via a WEB browser application. TSs can be sent out or in via UDP/IP or RTP/UDP/IP
transfer protocols.
3D Support
3D is a very new area in the Broadcast industry. From a content collection standpoint it is normally
accomplished with two separate cameras that are GEN-LOCKED together outputting two separate
Video signals.
Figure 2 Content Collection Format
AES-C Scrambling
The AES-C Scrambling option can be used to add security to your data transmission. The system
scrambles the payload portion of the TS packets. Only the TS header remains unscrambled to
enable operation with standard DVB-T receivers. The 128 bit-scrambling key is entered through the
M2ECHPT’s control interface. The user can enable or disable the scrambling as well as choosing if
the key is stored within the Tx or not via Cobham’s LAN WEB Page GUI. Encryption on/off is also
available from the local control panel.
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