Drake digital DQT1000, MQM1000 User Manual

DQT1000 Digital to QAM Transcoder

MQM1000 Multiplexing QAM Modulator

Instruction Manual

TM is a trademark of R.L. Drake LLC

is a registered trademark of R.L. Drake LLC

© Copyright 2007 R.L. Drake LLC P/N: 3852395C-09-2007 Printed in U.S.A.

2

Caution Statements

WARNING: TO PREVENT FIRE OR

ELECTRICAL SHOCK DO NOT

EXPOSE TO RAIN OR MOISTURE

CA UTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF ELECTRIC

SHOCK,

DO NOT REMOVE COVER

NO USER-SERVICEABLE PARTS INSIDE

REFER SERVICING TO QUALIFIED PERSONNEL

WARNING:

CAUTION:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS PRODUCT
TO RAIN OR MOISTURE.
DO NOT OPEN THE CABINET, REFER SERVICING TO QUALIFIED PERSONNEL ONLY.

TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION
CORD RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO
PREVENT BLADE EXPOSURE.

A product and cart combination should be moved
with care. Quick stops, excessive force and uneven
surfaces may cause the product and cart combina­tion to overturn.

The lightning flash with arrow head symbol, within
an equilateral triangle, is intended to alert the user
to the presence of uninsulated "dangerous voltage"
within the product's enclosure that may be of
sufficient magnitude to constitute a risk of electric
shock to persons.

The exclamation point within an equilateral triangle
is intended to alert the user to the presence of
important operating and maintenance (servicing)
instructions in the literature accompanying
the product.

ATTENTION:

POUR PREVENIR LES CHOCS ELECTRIQUES, NE PAS UTILISER CETTE FICHE POLARISEE
AVEC UN PROLONGATEUR, UNE PRISE DE COURANT OU UNE AUTRE SORTIE DE COUR­ANT, SAUF SI LES LAMES PEUVENT ETRE INSEREES A FOND SANS EN LAISSER AUCUNE
PARTIE A DECOUVERT.

The DQT1000 and MQM1000 have been designed to comply with, and tested to confirm compliance to,
the following satety regulations:

ANSI/UL 60065, 7th Edition, dated 06/30/2004, rev . 1 1/20/2006.
CAN/CSA - C22.2 No. 60065:03 (2006).

Important Safety Instructions

3

1. Read Instructions—All the safety and operating instructions should be read
before the product is operated.

2. Retain Instructions—The safety and operating instructions should be
retained for future reference.

3. Heed Warnings—All warnings on the product and in the operating
instructions should be adhered to.

4. Follow Instructions—All operating and use instructions should be followed.

5. Cleaning—Unplug this product from the wall outlet before cleaning. Do not

use liquid cleaners or aerosol cleansers. Use a damp cloth for cleaning.

6. Attachments—Do not use attachments that are not recommended by the
product manufacturer as they may cause hazards.

7. Water and Moisture—Do not use this product near water—for example,
near a bathtub, wash bowl, kitchen sink or laundry tub; in a wet basement;
or near a swimming pool; and the like.

8. Accessories—Do not place this product on an unstable cart, stand, tripod,
bracket, or table. The product may fall, causing serious injury to a child or adult,
and serious damage to the product. Use only with a cart, stand, tripod, bracket,
or table recommended by the manufacturer, or sold with the product. Any
mounting of the product should follow the manufacturer's instructions, and
should use a mounting accessory recommended by the manufacturer.

9. A product and cart combination should be moved with care. Quick stops,
excessive force, and uneven surfaces may cause the product and cart
combination to overturn.

10. Ventilation—Slots and openings in the cabinet are provided for ventilation
and to ensure reliable operation of the product and to protect it from
overheating, and these openings must not be blocked or covered. The
openings should never be blocked by placing the product on a bed, sofa, rug,
or similar surface. This product should not be placed in a built-in installation
such as bookcase or rack unless proper ventilation is provided or the
manufacturer's instructions have been adhered to.

11. Power Sources—This product should be operated only from the type of
power source indicated on the marking label. If you are not sure of the type of
power supplied to your home, consult your product dealer or local power
company. For products intended to operate from battery power, or other
sources, refer to the operating instructions.

12. Grounding or Polarization—This product may be equipped with a
polarized alternating-current line plug (a plug having one blade wider than the
other). This plug will fit into the power outlet only one way. This is a safety
feature. If you are unable to insert the plug fully into the outlet, try reversing
the plug. If the plug should still fail to fit, contact your electrician to replace
your obsolete outlet. Do not defeat the safety purpose of the polarized plug.
Alternate Warnings—If this product is equipped with a three-wire grounding­type plug, a plug having a third (grounding) pin, the plug will only fit into a
grounding-type power outlet. This is a safety feature. If you are unable to insert
the plug into the outlet, contact your electrician to replace your obsolete outlet.
Do not defeat the safety purpose of the grounding-type plug.
12 a. Mise à la terre ou Polarisation—Cet appareil est équipé avec un cordon
d'alimentation à trois fils. Il est a brancher sur une prise ayant un connecteur
a la terre. Assurez-vous que la connection a la terre ne manque pas.

13. Power-Cord Protection—Power-supply cords should be routed so that
they are not likely to be walked on or pinched by items placed upon or against
them, paying particular attention to cords at plugs, convenience receptacles,
and the point where they exit from the product.

14. Outdoor Antenna Grounding—If an outside antenna or cable system is
connected to the product, be sure the antenna or cable system is grounded so
as to provide some protection against voltage surges and built-up static
charges. Article 810 of the National Electrical Code, ANSI/NFPA 70, provides
information with regard to proper grounding of the mast and supporting
structure, grounding of the lead-in wire to an antenna discharge unit, size of
grounding conductors, location of antenna-discharge unit, connection to
grounding electrodes, and requirements for the grounding electrode.
See Figure A.

15. Lightning—For added protection for this product during a lightning storm,
or when it is left unattended and unused for long periods of time, unplug it from
the wall outlet and disconnect the antenna or cable system. This will prevent
damage to the product due to lightning and power-line surges.

16. Power Lines—An outside antenna system should not be located in the
vicinity of overhead power lines, other electric light or power circuits, where it
can fall into such power lines or circuits. When installing an outside antenna
system, extreme care should be taken to keep from touching such power lines
or circuits as contact with them may be fatal.

17. Overloading—Do not overload wall outlets, extension cords, or integral
convenience receptacles as this can result in a risk of fire or electric shock.

18. Object and Liquid Entry—Never push objects of any kind into this product
through openings as they may touch dangerous voltage points or short-out
parts that could result in a fire or electric shock. Never spill liquid of any kind
on the product.

19. Servicing—Do not attempt to service this product yourself as opening
or removing covers may expose you to dangerous voltage or other hazards.
Refer all servicing to qualified service personnel.

20. Damage Requiring Service—Unplug this product from the wall outlet and
refer servicing to qualified service personnel under the following conditions:

a. When the power-supply cord or plug is damaged,
b. If liquid has been spilled, or objects have fallen into the product,
c. If the product has been exposed to rain or water,
d. If the product does not operate normally by following the operating

instructions. Adjust only those controls that are covered by the operating
instructions as an improper adjustment of other controls may result in damage
and will often require extensive work by a qualified technician to restore the
product to its normal operation,

e. If the product has been dropped or damaged in any way, and
f. When the product exhibits a distinct change in performance—this indicates

a need for service.

21. Replacement Parts—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.

22. Safety Check—Upon completion of any service or repairs to this product,
ask the service technician to perform safety checks to determine that the
product is in proper operating condition.

23. Wall or Ceiling Mounting—The product should be mounted to a wall or
ceiling only as recommended by the manufacturer.

24. Heat—The product should be situated away from heat sources such as
radiators, heat registers, stoves, or other products (including amplifiers) that
produce heat.

NOTE TO CATV SYSTEM INSTALLERS:

THIS REMINDER IS PROVIDED TO CALL THE
CATV SYSTEM INSTALLER'S ATTENTION TO
ARTICLE 820 - 40 OF THE NEC THAT
PROVIDES GUIDELINES FOR PROPER
GROUNDING AND, IN PARTICULAR,
SPECIFIES THAT THE CABLE GROUND SHALL
BE CONNECTED TO THE GROUNDING
SYSTEM OF THE BUILDING, AS CLOSE TO
THE POINT OF CABLE ENTRY AS PRACTI­CAL.

Example of antenna grounding as per National Electrical Code, ANSI/NFPA 70

GROUND CLAMP

ELECTRIC
SERVICE
EQUIPMENT

NEC - NATIONAL ELECTRIC CODE

Figure A

ANTENNA
LEAD IN
WIRE

ANTENNA
DISCHARGE UNIT
(NEC SECTION 810-20)

GROUNDING CONDUCTORS
(NEC SECTION 810-21)

GROUND CLAMPS

POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250, PART H)

4 Table of Contents / Specifications

TABLE OF CONTENTS

2 Caution Statements
3 Important Safety Instructions
4 Table of Contents / Specifications
5 General Description
6 Installation and Mounting / Front Panel Controls

SPECIFICATIONS

DEMODULAT OR (S)

DQT1000 ONLY :

Input Frequency Range:

Channel Plans (Menu selectable):

Input Channel Bandwidth:

Input RF Level Range:

Minimum Input Level per Mode:

Maximum Input Power (sum of all channels):

Input Impedance:

Image rejection:

Adjacent Channel Rejection:

Noise Figure:

Demodulation Modes:

Symbol Rates:

Equalizer Span:

ASI INPUTS

MQM1000-Two Inputs

DQT1000 ASI Option:

NULL PACKET PROCESSING:

QAM MODULATOR

Modulation Modes:

Symbol Rate:

I/Q Phase Error:

Carrier Suppression:

Channel Amplitude Error:

ANALOG EAS IF INPUT

Operating Input Level:

Auto Switching Level:

UPCONVERTER RF OUTPUT

Output Frequency Range:

Channel Plan:

FCC offsets:

Frequency Stability:

Maximum Output Level:

Minimum Output Level:

Output Level Accuracy:

Output Impedance:

Spurious Outputs:
Broadband Noise:

Phase Noise:

RS232 CONTROL

Data Link:

RS232 Input:

RS232 Output:

GENERAL

Power:

Weight:

Operating Temperature:

7 Rear Panel Controls and Connections
8 Setup and Programming
12 Operation / Additional Features
13 Service / If You Need To Call For Help
14 Warranty

Not present - MQM1000
54 to 864 MHz.
Std. CATV, HRC, IRC, or Broadcast
6 MHz.

-28 dBmV to +30 dBmV
8VSB: -28dBmV, 16VSB: -25dBmV,
64QAM: -20dBmV, 256QAM: -15 dBmV.
Not to exceed -16 dBm.
75 Ohms with Return Loss typically 8 dB.
40 dB.
60 dB
Less than 12 dB.
8VSB,16VSB - ATSC
16QAM, 32QAM, 64QAM, 128QAM, or 256QAM - ITUA
64QAM, 256QAM, - ITUB
Commonly used presets and user programmable.

-6 µS to +40 µS.

270 Mbps with desired transport stream of

10.76 MS/s, ATSC, 19.37 Mbps
DQT1000 and MQM1000 (fixed output clock mode)

16QAM, 32QAM, 64QAM, 128QAM, 256QAM, 512QAM or
1024QAM. (See page 9 for all available combinations of QAM

modes and FEC.)

1 Ms/s to 7 Ms/s.

FEC:

ITUA (DVB) or ITUB (DigiCipher II).
Less than 1 degree.
45 dB.
Less than 1 dB.

MER:

Greater than 38 dB with blind equalizer.

+30 dBmV ±5 dB at 45.75 MHz, 75 Ohms
+ 20 dBmV minimum.

54 MHz to 1002 MHz.
Std. CATV, HRC, IRC, or Broadcast
Automatic, +12.5 or +25 kHz
± 5 ppm.
+ 61 dBmV minimum, adjustable downward.
+ 45 dBmV.
± 1 dB.
75 Ohms with return loss better than 14 dB
(within output filter passband).

-60 dBc from 40 MHz to 1000 MHz.
Less than -12 dBmV (6 MHz BW @ ±12 MHz).

-101 dBc @ 10 kHz offset

2400, 4800, 9600, or 19,200 baud interface via serial cable.
DB-9 connector for connection to modem or PC.
DB-9 connector for connection to addtional transcoders.

90 - 132 VAC/ 60 Hz, 40 W maximum.
7 pounds

Size:

19” W x 1.75” H x 11.5” D.
0 degrees C to + 50 degrees C

Specifications subject to change without notice or obligation.

ASI A ASI B

24.52dB26.88dB

General Description 5

MQM1000 Multiplexing QAM Modulator

ENTER

GENERAL DESCRIPTION

The R.L. Drake model DQT1000 is a professional quality,
digital headend transcoder that receives one or two ATSC,
or ATSC compatible MPEG2, 8VSB or QAM signals from
an off air antenna or from a CATV source. It demodulates
the signals to recover the MPEG2 transport stream(s),
multiplexes the MPEG2 transport streams from DEMOD A
and either the second RF input (DEMOD B) or the ASI
input if used, and modulates the resulting combined
stream using QAM modulation followed by a built in
upconverter for output to a CATV system.

The model MQM1000 does not contain a RF demodulator
but instead accepts one or two ATSC multiprogram
transport streams via two BNC, ASI inputs. When two
streams are input, the MQM1000 then multiplexes the two
ATSC streams in the same manner as the DQT1000.

The DQT1000 and MQM1000 provide essentially the
same function as the popular DQT860 and MQM860 units.
In addition, the '861' and '1000' models provide a program
filter function (a new Select Program menu) and offer
improved upconverter specs with phase noise reduced to
a level that is compatible with QAM modes up though
1024QAM.
The '1000' models provide the same features as the '861'
models except that the upconverter has been upgraded to
allow operation up to 1000 MHz on the output side. The
new '1000' models can be used with the Drake Digital
Headend Remote Control Software, version 2.6 or later,
for remote controlling or remote monitoring of operating
parameters. This program can also be used to download
new firmware into the unit if that ever becomes desirable.

The DQT1000 and MQM1000 operate in a fixed output
clock mode and process null packets when required to
maintain the set fixed clock rate. PCR correction is
included.

DIGITAL CHANNEL PROCESSING

The single input DQT1000, available by special order, is
ideal for digital 'channel processing' applications where a
single digital video signal is received, error corrected,
clocked at a user determined fixed rate and remodulated
on the same or another RF channel. Applications include
cleaning up a low MER QAM signal received from a CATV
source or fiber link receiver, or shifting the RF frequency of
a QAM modulated signal. It may be used to convert one
off-air A TSC 8VSB signal to a QAM output with rate
adjustment. Used in the processor mode with only one
input, the DQT1000 can process ATSC, DVB, or DigiCipher
II compliant MPEG2 inputs that are either VSB or QAM
modulated. No multiplexing or altering of any MPEG
tables is performed in this mode.

Used in the non multiplexing mode, the data rate of the
incoming signal can be any rate that falls within the
specification range. The output rate can be set to any fixed
output rate (equal to or faster than the input rate).

MULTIPLEXING TWO A TSC TRANSPORT STREAMS

With the second RF input/tuner/demodulator (Demod B),
the DQT1000 can accept two 19.4 Mbps ATSC signals
(either with 8VSB modulation or QAM modulation) and
multiplex the transport streams to obtain a 38.8 Mbps
256QAM output. Thus two ATSC inputs can be output on a
single 6 MHz bandwidth 256 QAM channel.

Another way of combining two ATSC 19.4 Mbps streams is
to receive the first stream using the 8VSB input (Demod A)
and input the second stream, if available in ASI format, to
the optional ASI input on The DQT1000. Again the two
combined ATSC signals will be modulated at 256QAM in a
6 MHz wide channel.

If it is desired to provide both ATSC signals from ASI
sources, the model MQM1000 can be used.

When the DQT1000 or MQM1000 multiplexes two ATSC
inputs to produce a 38.8 Mbps output, no loss of picture or
sound packets occurs. There is no added compression
of the video or audio streams. Only the necessary control
packets are rewritten to prevent duplication of MPEG2
program numbers and major and minor channel number
assignments in the tables.

PROGRAM FILTERING

A 'Select Program' function is provided to allow the
operator to select which of the MPEG programs present
on the A and B input streams are to be included in the
output multiplex.

PSIP OPTIONS

When operating in the multiplex mode, the DQT1000 or
MQM1000 can be set to process PSIP information from
both sources and rewrite tables containing combined
PSIP information, or in cases where the off-air broadcast
channels may not be transmitting some or all of the
tables, it can be set to ignore and discard the PSIP tables
completely, or it can be set to generate MGT and VCT
tables without EIT tables. Null packet processing is
applied as necessary to keep the output data rate at the
desired setting. PCR correction is performed when
necessary.

OUTPUT

The RF output is always QAM regardless of whether the
input is VSB or QAM and the built-in agile upconverter
provides 61 dBmV output.