Drake digital DDC864 User Manual

TM

DDC864 DIGIT AL DOWNCONVERTER 1

2

FRONT PANEL CONTROLS and INDICATORS

12 POSITION RACK MOUNT POWER SUPPLY

DUC864

DDC864

CATV

+100BCTV

25

CATV

PWR/

PWR/

ERROR

ERROR

SIGNAL

21

CATV
+100BCTV

CATV

GAIN

DDC864

25

CATV
+100BCTV

CATV

DUC864

PWR/

PWR/

ERROR

ERROR

SIGNAL

21

CATV
+100BCTV

CATV

GAIN

DDC864

25

CATV
+100BCTV

CATV

DUC864

PWR/

PWR/

ERROR

ERROR

SIGNAL

21

CATV
+100BCTV

CATV

GAIN

DDC864

25

CATV
+100BCTV

CATV

DUC864

PWR/

PWR/

ERROR

ERROR

SIGNAL

21

CATV

+100BCTV

CATV

GAIN

PS8

DDC864

DOWNCONVERTER

TV

BC

SIGNAL

PWR/

ERROR

CATV

25

DDC864

+100

CATV

DUC864

The R.L. Drake DDC864 is a low noise
downconverter designed for translating
digital signals from their off-air or CATV
channel to a 44 MHz IF output. The output of
the DDC864 can be connected to a DUC
series upconverter to place the digital signal
on a new output channel.

TV

BC

PWR/

GAIN

ERROR

CATV

35

+100

CATV

DRMM4

DDC864

TV

BC

SIGNAL

PWR/

ERROR

CATV

25

+100

CATV

DUC864

TV

BC

PWR/

ERROR

CATV

28

+100

CATV

The DDC864 provides low noise figure and low
phase noise as well as a flat passband to
minimize signal deterioration.

The DDC864 is optimized for use with ATSC
8VSB modulation in a 6 MHz wide channel
assignment. The passband is designed for

optimized operation with 8VSB signals in an
When the DDC864 is used with the DUC550
or DUC860, all input/output channel
combinations are usable except "on
channel" conversions.

adjacent channel environment. For translation

of QAM signals, the Drake model QQP860 is

preferred for this task

.

GAIN

POWER SUPPLY

F1
F2

F3

CATV

+100

F4

F1 - POWER/ERROR Indicator

Lights when the unit is connected to the
required source of DC power via the rear panel
DC INPUT connector. A flashing condition
indicates an invalid channel setting or other
conditions that would cause the unit to operate
on an invalid channel. The RF output is
switched off for flashing (ERROR) conditions.

F2 - SIGNAL Indicator

Lights when a signal is present.

F3 - Channel Number Switch

Sets the desired operating channel for standard
CATV channels 02 through 135 or Broadcast
TV channels 02 through 69. See also Item F4
which sets the type of channel (CATV or
Broadcast TV) and sets the leading “1” for
CATV channels 100 through 135.

DDC864

PWR/
ERROR

SIGNAL

25

BC
TV

CATV

Figure 1

F4 - Mode Switch

Sets the type of channel, CATV or Broadcast
TV (“BC TV”). The "+100" position of the switch
sets a leading “1” for CATV channels 100
through 135. See also Item F3 for setting the
channel number.

For example: For example:
Setting for CATV Setting for CATV
channel "124"- channel "75"-

25 75

CATV

+100

TV TV

CATV CATV

CATVBC

+100

BC

When the DDC864 is used with the DUC864,
"on channel" conversions, (the same input
channel on the DCC and output channel on
the DUC) are acceptable.

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

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

Copyright 2006 R.L. Drake Company P/N: 3852391A-1-2006 Printed in the U.S.A.

REAR PANEL CONNECTIONS 3

4

INSTALLATION

R1

R2

R3

R1 - IF OUTPUT Connector

This is the 44 MHz IF output. The level is
+30 dBmV.

R2 - DC INPUT Connector

This 3-pin connector (Male) accepts the
appropriate mating DC power cable. Observe
proper orientation and wiring.

R3 - RF IN Connector

This is the downconverter RF input from an
antenna or CATV feed.

+12 V

GND

+5 V

Figure 2

IF OUT
POWER

RF IN

+12 V
GND
+5 V

CONNECTIONS AND CONTROLS

All connections to and from each upconverter
are made through the rear panel.

DESCRIPTION

Figure 3 shows a typical installation utilizing the
Drake DRMM12 rack with 4 DDC864
downconverters, and 4 DUC upconverters.
A PS8 power supply module is used to power
all units.

POWER
SUPPLY

DC OUTPUTS X 8

12V GND 5V

DC OUTPUT RATING.
TOTAL OF ALL OUTPUTS: +5V:6A MAX.

+12V:2.5A MAX.

100-240 V ~

50/60 Hz

85 WATTS

AC POWER

CONNECTOR

RACK MOUNTING

Adequate ventilation is very important in
multichannel installations. Units should be
spaced apart vertically by at least 1.75"
wherever possible, and some air movement is
mandatory in enclosed rack cabinets.
Excessive heat will shorten component life and
performance will be degraded without
proper cooling.

DDC864
DIGITAL
DOWNCONVERTERS

IF OUT

IF IN

POWER

POWER

+12 V

+12 V

GND

GND

+5 V

RF OUT

GND

+5 V

RF IN

IF OUT

IF IN

POWER

POWER

+12 V

+12 V

GND

+5 V

+5 V

RF IN

RF OUT

IF OUT

IF IN

POWER

POWER

+12 V

+12 V

GND

GND

+5 V

+5 V

RF IN

RF OUT

DUC864
UPCONVERTERS

Figure 3

IF OUT

IF IN

POWER

POWER

+12 V

+12 V

GND

GND

+5 V

+5 V

RF IN

RF OUT

CATV CHANNEL INPUT FREQUENCIES 5

6

BROADCAST TV CHANNEL INPUT FREQUENCIES

CABLE TV CHANNELS

Channel

Number

EIA/NCTA

Numeric

Equivalent

2
3
4
5

6
95
96
97
98
99
14
15
16
17
18
19
20
21
22

7

8

9
10
11
12
13
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

Center of

Channel

Frequency

in MHz

57
63
69
79
85
93

99
105
111
117
123
129
135
141
147
153
159
165
171
177
183
189
195
201
207
213
219
225
231
237
243
249
255
261
267
273
279
285
291
297
303
309
315
321

TABLE 1:

CATV

CABLE TV CHANNELS

Channel

Number

EIA/NCTA

Numeric

Equivalent

41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85

CATV

+100

Center of

Channel

Frequency

in MHz

CATV

327
333
339
345
351
357
363
369
375
381
387
393
399
405
411
417
423
429
435
441
447
453
459
465
471
477
483
489
495
501
507
513
519
525
531
537
543
549
555
561
567
573
579
585
591

BC
TV

CABLE TV CHANNELS

Channel

Number

EIA/NCTA

Numeric

Equivalent

86
87
88
89
90
91
92
93
94

CATVCATV

CATV

+100

+100

+100

100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

CATV

CATV

CATV

Center of

Channel

Frequency

in MHz

597
603
609
615
621
627
633
639
645

BC

BC

BC
TV

TV

TV

651
657
663
669
675
681
687
693
699
705
711
717
723
729
735
741
747
753
759
765
771
777
783
789
795
801
807
813
819
825
831
837
843
849
855
861

CATV

TABLE 2:

BC TV

+100

CATV

VHF BROADCAST CHANNELS

Channel
Number

2
3
4
5
6
7
8

9
10
11
12
13

Center of Channel

Frequency (MHz)

57
63
69
79

85
177
183
189
195
201
207
213

BC
TV

CATV

+100

BC
TV

CATV

UHF BROADCAST CHANNELS

Channel
Number

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
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69

Center of Channel

Frequency (MHz)

473
479
485
491
497
503
509
515
521
527
533
539
545
551
557
563
569
575
581
587
593
599
605
611
617
623
629
635
641
647
653
659
665
671
677
683
689
695
701
707
713
719
725
731
737
743
749
755
761
767
773
779
785
791
797
803