Drake DDC864A User Manual
DDC864A DIGITAL DOWNCONVERTER 1
TM
2 FRONT PANEL CONTROLS and INDICATORS
12 POSITION RACK MOUNT POWER SUPPLY
DUC864
DDC864A
25
PWR/
PWR/
ERROR
ERROR
SIGNAL
21
CATV
BC
TV
+100
CATV
GAIN
DDC864A
25
DUC864
PWR/
PWR/
ERROR
ERROR
SIGNAL
21
CATV
BC
TV
+100
CATV
GAIN
DDC864A
25
DUC864
PWR/
PWR/
ERROR
ERROR
SIGNAL
21
CATV
BC
TV
+100
CATV
GAIN
DDC864A
25
DUC864
PWR/
PWR/
ERROR
ERROR
SIGNAL
21
CATV
BC
TV
+100
CATV
GAIN
PS8
DDC864A
DOWNCONVERTER
TV
BC
DDC864A
SIGNAL
PWR/
ERROR
25
DUC864
PWR/
GAIN
ERROR
CATV
35
+100
CATV
The R.L. Drake DDC864A is a low noise
downconverter designed for translating
digital ATSC, 8VSB signals from their off-air
channel to a 44 MHz IF output. The output of
the DDC864A can be connected to a DUC
series upconverter to place the digital signal
on a new output channel.
SIGNAL
PWR/
ERROR
25
DDC864A
DRMM4
The DDC864A provides low noise figure and low
phase noise as well as a flat passband to
minimize signal deterioration.
The DDC864A is optimized for use with ATSC
8VSB modulation in a 6 MHz wide channel
assignment. The passband is designed for
DUC864
BC
PWR/
ERROR
28
CATV
optimized operation with 8VSB signals in an
When the DDC864A is used with the
DUC864, "on channel" conversions, (the
same input channel on the DCC and output
adjacent channel environment. For translation of
QAM signals, the Drake model DQT1000 is
preferred for this task.
channel on the DUC) are acceptable.
DDC864A
PWR/
ERROR
SIGNAL
25
POWER SUPPLY
F1
F2
F3
Figure 1
F1 - POWER/ERROR Indicator
Lights when the unit is connected to the
TV
GAIN
CATV
+100
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
F2 - SIGNAL Indicator
Lights when a signal is present.
F3 - Channel Number Switch
Sets the desired operating channel for standard
Broadcast TV channels 02 through 69.
on an invalid channel. The RF output is
switched off for flashing (ERROR) conditions.
TM is a trademark of the R.L. Drake Holdings, LLC
is a registered trademark of the R.L. Drake Holdings, LLC
Copyright 2008 R.L. Drake Holdings, LLC P/N: 3852391B-9-2008
.
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 DDC864A
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.
DDC864A
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
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