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1                           DD860 DIGITAL DEMODULATOR

TM

     

     

CONTROLS, INDICATORS AND CONNECTIONS          2

DIGITAL DEMODULATOR

CHANNEL

LOCK

ERROR

SNR

40 dB

15 dB

DD806

0

4

1

DIGITAL DEMODULATOR

CHANNEL

LOCK

ERROR

SNR

40 dB

15 dB

DD806

0

4

1

DIGITAL DEMODULATOR

CHANNEL

LOCK

ERROR

SNR

40 dB

15 dB

DD806

0

4

1

POWER SUPPLY

PS8

R.L. DRAKE COMPANY

230 INDUSTRIAL DRIVE

FRANKLIN, OHIO 45005  U.S.A.

 CUSTOMER SERVICE AND PARTS TELEPHONE:  +1 (937) 746-6990

 TELEFAX: +1 (937) 743-4576

WORLD WIDE WEB SITE: http://www.rldrake.com

12 POSITION RACK MOUNT                                                                       POWER SUPPLY

           DD860 SATELLITE DEMODULATOR

TM

 

is a trademark of the R.L. Drake Company

®

 is a registered trademark of the R.L. Drake Company

© Copyright 2003 R.L. Drake Company          P/N: 3852380A-1-2003       Printed in the U.S.A.

The R.L. Drake model DD860 Digital
Demodulator is a professional quality modular
digital headend component designed to provide
optimum performance for VSB or QAM
demodulation. The DD860 receives an 8 VSB,
16 VSB, 64 QAM, or 256 QAM signal from a
terrestrial broadcast or CATV feed in the 54 to
858 MHz range, and demodulates the signal
providing an MPEG-2 digital transport stream
output.

The DD860 normally provides two 75 Ohm,
serial ASI outputs.  A parallel SPI output is
available on special order.

Front panel signal to noise ratio and staus
indicators are provided.

A low phase noise tuner design provides
reliable operation with dense signal constella-
tions such as 256 QAM or 16 VSB.

An NTSC co-channel rejection filter for VSB
modes is incorporated.

A wide range equalizer eliminates multipath
effects.

QAM modes incorporate auto selection of 

I

TU

A (DVB) or 

I

TU B (DigiCipher 

II

)

FEC.

IRC and HRC channel plans are selectable by
moving an internal jumper.

The DD860 is designed to mount in the
DRMM12 rack mounting cage.

RF INPUT

POWER

SPI  L

VDS  OUTPUT

13

1

25

14

+12 V  GND  +5 V

ASI TRANSPORT

STREAM OUTPUT

RF INPUT

POWER

SPI  L

VDS  OUTPUT

13

1

25

14

+12 V  GND  +5 V

ASI TRANSPORT

STREAM OUTPUT

DIGITAL DEMODULATOR

CHANNEL

LOCK

ERROR

SNR

40 dB

15 dB

DD806

0

4

1

F2

Figure 1

F3

F4

F1 - LOCK
This indicator shows that the demodulator is
receiving a valid digital signal and has locked
to it.

F2 - LED Signal-to-Noise Ratio Meter
Indicates the signal-to-noise ratio of the
received signal.  The range is between 15 dB
and 40 dB.  Threshold levels are nominally
15 dB for 8VSB, 29 db for 16VSB, 23 db for
64 QAM, and 28dB for for 256QAM.  These are
minimum levels required for lock.  Normal
operating levels must exceed threshold by
several dB to ensure reliable operation.

F3 - CHANNEL Selector Switch
This switch is used to enter the two or three
digit channel number.  The range of numbers is
also used to determine the mode of operation.

F4 - ERROR
This indicator shows that the FEC is not able to
correct all errors in the received signal.  Check
for a low signal-to-noise ratio or improper
antenna aiming if errors occur.

FRONT PANEL CONTROLS AND

INDICATORS

R1

R2

R1 - RF INPUT
This "F" type connector is the input for the
tuner.  The DD860 will tune to all U.S.A. off air
broadcast frequencies or to standard EIA CATV
channels up to 858 MHz (channel 134).

R2 - DC Power Connector
This is the power input connector.  Connect to a
Drake PS8 or equivalent power supply.

R3  - BNC Connectors (ASI output model)
These are the MPEG2 transport stream
outputs.  The ASI (Asynchronous Serial
Interface) Output Impedance is 75 Ohms.

R4 - 25 Pin SPI LVDS OUTPUT Connector
(SPI output model)
This is the MPEG2 transport stream output.
The DVB Synchronous Parallel Interface levels
comply with low voltage differential signalling
specifications.

Figure 2 (ASI)

+12V  GND  +5

REAR PANEL CONNECTIONS

R4

Figure 3 (SPI)

R1

R2

R3

F1

Summary of Contents for DD860

Page 1: ...d to mount in the DRMM12 rack mounting cage RF INPUT POWER SPI LVDS OUTPUT 13 1 25 14 12 V GND 5 V ASI TRANSPORT STREAM OUTPUT RF INPUT POWER SPI LVDS OUTPUT 13 1 25 14 12 V GND 5 V ASI TRANSPORT STREAM OUTPUT DIGITAL DEMODULATOR CHANNEL LOCK ERROR SNR 40 dB 15 dB DD806 0 4 1 F2 Figure 1 F3 F4 F1 LOCK This indicator shows that the demodulator is receiving a valid digital signal and has locked to i...

Page 2: ... 61 62 63 64 65 66 67 68 69 Center of Channel Frequency MHz UHF BROADCAST CHANNELS 8VSB Channel Number OFF AIR 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 DD860 Channel 57 63 69 79 85 177 183 189 195 201 207 213 2 3 4 5 ...

Page 3: ... 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 64 QAM 256 QAM 8 VSB 16 VSB H Y P E R CHANNEL CHARTS continued 6 DD860 Channel 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 700 Channel Number CABLE TV CHANNELS Center of Chann...

Page 4: ...rvice facility or ship the same in its original container or equivalent fully insured and shipping charges prepaid Correct maintenance repair and use are necessary to obtain proper performance from this product Therefore carefully read the Instruction Manual This warranty does not apply to any defect that R L DRAKE COMPANY determines is due to 1 1 1 1 1 Improper maintenance or repair including the...

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