DRAKE DD860 매뉴얼 - 페이지 2
{카테고리_이름} DRAKE DD860에 대한 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. DRAKE DD860 4 페이지. Digital demodulator
페이지 인쇄
3
INSTALLATION
All connections to and from each module are
made through the rear panel. Refer to Figure 4
for correct cable and wiring connections.
RACK MOUNTING
Adequate ventilation is very important in
multichannel installations.
PS8 POWER SUPPLY
POWER SUPPLY CABLES
RF INPUT
ASI TRANSPORT
STREAM OUTPUT
POWER
+12 V GND +5 V
12V GND 5V
90-260 VAC
DC OUTPUTS X 8
AC POWER
FROM OFF-AIR
CORD
ANTENNA OR CATV
The DD860 is designed to mount into the
DRMM12 rack mounting enclosure.
The DD860 is four units wide. Power for the
DD860 should be supplied by the model PS8
power supply module which also mounts into
the DRMM12.
Pin Out DVB SPI Interface
14 Data Clk -
1 Data Clk +
15 GND
2 GND
13
16 Data 7 -
3 Data 7 +
25
17 Data 6 -
4 Data 6 +
18 Data 5 -
5 Data 5 +
19 Data 4 -
6 Data 4 +
20 Data 3 -
7 Data 3 +
21 Data 2 -
8 Data 2 +
14
22 Data 1 -
9 Data 1 +
1
23 Data 0 -
10 Data 0 +
24 Data Valid -
11 Data Valid +
25 Start of Packet -
12 Start of Packet +
13 GND
The DRMM12 frames should be spaced apart
vertically by at least 1 3/4" wherever possible.
Air movement is mandatory in enclosed rack
cabinets. Excessive heat will shorten
component life.
DD860
DEMODULATOR UNIT
RF INPUT
RF INPUT
13
13
25
ASI TRANSPORT
25
ASI TRANSPORT
25
STREAM OUTPUT
STREAM OUTPUT
14
14
14
1
POWER
POWER
1
+12 V GND +5 V
+12 V GND +5 V
TO
TO
QAM ASI
QAM SPI
INPUT
INPUT
Figure 4
The front panel channel selection switches are
used to select the mode of demodulation, the
desired band plan (CATV or Broadcast) and the
specific channel number. Four blocks of 133
channels each are allocated to CATV channels
and two blocks of 68 channels each are
allocated for off-air broadcast frequencies.
CATV channels in 64 QAM modulation are
selected using switch settings 002 through 134.
These switch settings correspond directly to the
EIA CATV channel numbers.
CATV channels in 256 QAM modulation are
selected using switch settings 202 through 334.
To determine the switch setting, add 200 to the
desired EIA CATV channel number.
13
CATV channels in 8 VSB modulation are
selected using switch settings 402 through 534.
1
To determine the switch setting, add 400 to the
desired EIA CATV channel number.
CATV channels in 16 VSB modulation are
selected using switch settings 602 through 734.
To determine the switch setting, add 600 to the
desired EIA CATV channel number.
Off-Air Broadcast channels in 8 VSB may be
tuned by selecting channels 802 through 869.
Add 800 to the broadcast channel number that
corresponds to the actual RF transmission
channel. Do not enter the virtual channel
number, used by some broadcasters.
NOTE: IRC and HRC CATV formats are
supported by setting of an internal jumper.
VHF BROADCAST CHANNELS
Center of Channel
Channel
Number
Frequency (MHz)
2
3
4
5
6
7
8
9
10
11
12
13
DD860 CHANNEL SELECTION / CHANNEL CHARTS
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
OFF-AIR
55
56
8VSB
57
DD860
58
Channel
59
57
802
60
63
803
61
69
804
62
79
805
63
85
806
64
177
807
65
183
808
66
189
809
67
195
810
68
201
811
69
207
812
213
813
4
OFF-AIR
8VSB
Center of Channel
DD860
Frequency (MHz)
Channel
473
814
479
815
485
816
491
817
497
818
503
819
509
820
515
821
521
822
527
823
533
824
539
825
545
826
551
827
557
828
563
829
569
830
575
831
581
832
587
833
593
834
599
835
605
836
611
837
617
838
623
839
629
840
635
841
641
842
647
843
653
844
659
845
665
846
671
847
677
848
683
849
689
850
695
851
701
852
707
853
713
854
719
855
725
856
731
857
737
858
743
859
749
860
755
861
761
862
767
863
773
864
779
865
785
866
791
867
797
868
803
869