DRAKE DDC864 User Manual

2

FRONT PANEL CONTROLS and INDICATORS

F1
F2
F3

F4

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"-

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 DIGITAL DOWNCONVERTER 1

TM

12 POSITION RACK MOUNT POWER SUPPLY

DDC864

DOWNCONVERTER

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.

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.

When the DDC864 is used with the DUC550
or DUC860, all input/output channel
combinations are usable except "on
channel" conversions.

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.

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
adjacent channel environment. For translation
of QAM signals, the Drake model QQP860 is
preferred for this task

.

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

25 75

CATV

+100

CATV CATV

+100

CATVBC

TV TV

BC

DDC864

PWR/
ERROR

CATV

+100

BC
TV

CATV

25

SIGNAL

PS8

POWER SUPPLY

DUC864

GAIN

PWR/

ERROR

CATV
+100BCTV

CATV

21

DDC864

PWR/
ERROR

CATV
+100BCTV

CATV

25

SIGNAL

DUC864

GAIN

PWR/
ERROR

CATV
+100BCTV

CATV

21

DDC864

PWR/
ERROR

CATV
+100BCTV

CATV

25

SIGNAL

DUC864

GAIN

PWR/

ERROR

CATV
+100BCTV

CATV

21

DDC864

PWR/
ERROR

CATV
+100BCTV

CATV

25

SIGNAL

DUC864

GAIN

PWR/

ERROR

CATV
+100BCTV

CATV

21

DDC864

PWR/
ERROR

CATV
+100BCTV

CATV

25

SIGNAL

CATV

TV

BC

+100

CATV

DDC864

25

CATV

TV

BC

+100

CATV

ERROR

PWR/

GAIN

DUC864

35

CATV

TV

BC

+100

CATV

ERROR

PWR/

GAIN

DUC864

28

CATV

TV

BC

+100

CATV

DDC864

25

DRMM4

SIGNAL

ERROR

PWR/

SIGNAL

ERROR

PWR/

REAR PANEL CONNECTIONS 3

Figure 2

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

4

INSTALLATION

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.

Figure 3

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.

POWER
SUPPLY

POWER

+12 V

GND

+5 V

IF OUT

RF IN

DDC864
DIGITAL
DOWNCONVERTERS

DUC864
UPCONVERTERS

100-240 V ~

50/60 Hz

85 WATTS

12V GND 5V

DC OUTPUTS X 8

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

+12V:2.5A MAX.

RF IN

IF OUT

+5 V

GND

+12 V

POWER

IF IN

POWER

+12 V

GND

+5 V

RF OUT

RF IN

IF OUT

+5 V

GND

+12 V

POWER

IF IN

POWER

+12 V

GND

+5 V

RF OUT

RF IN

IF OUT

+5 V

GND

+12 V

POWER

IF IN

POWER

+12 V

GND

+5 V

RF OUT

RF IN

IF OUT

+5 V

GND

+12 V

POWER

IF IN

POWER

+12 V

GND

+5 V

RF OUT

EIA/NCTA

Numeric

Equivalent

86
87
88
89
90
91
92
93
94

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

Frequency

in MHz

597
603
609
615
621
627
633
639
645

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 CHANNEL INPUT FREQUENCIES 5

TABLE 1:

CATV

Channel
Number

CABLE TV CHANNELS

Center of

Channel

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

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

Channel

Number

CABLE TV CHANNELS

Center of

Channel

Channel
Number

CABLE TV CHANNELS

Center of

Channel

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

Frequency

in MHz

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

6

BROADCAST TV CHANNEL INPUT FREQUENCIES

TABLE 2:

BC TV

Center of Channel

Frequency (MHz)

57
63
69
79

85
177
183
189
195
201
207
213

2
3
4
5
6
7
8

9
10
11
12
13

VHF BROADCAST CHANNELS

Channel

Number

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

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)

UHF BROADCAST CHANNELS

Channel
Number

CATV

TV

BC

+100

CATVCATV

+100

BC
TV

CATV

CATV

TV

BC

+100

CATV

CATV

TV

BC

+100

CATV

CATV

TV

BC

+100

CATV

CATV

TV

BC

+100

CATV