R.L.DRAKE DDC864 User Manual

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FRONT PANEL CONTROLS and INDICATORS

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:

Setting for CATV

channel "125"-

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

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

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.

PS8

POWER SUPPLY

DUC864

GAIN

PWR/

ERROR

CATV

+100

CATV

DDC864

GAIN

PWR/

ERROR

CATV

+100

CATV

SIGNAL

DUC864

GAIN

PWR/

ERROR

CATV

+100

CATV

DDC864

GAIN

PWR/

ERROR

CATV

+100

CATV

SIGNAL

DUC864

GAIN

PWR/

ERROR

CATV

+100

CATV

DDC864

GAIN

PWR/

ERROR

CATV

+100

CATV

SIGNAL

DUC864

GAIN

PWR/

ERROR

CATV

+100

CATV

DDC864

GAIN

PWR/

ERROR

CATV

+100

CATV

SIGNAL

CATV

+100

CATV

GAIN

DDC864

CATV

+100

CATV

ERROR

PWR/

GAIN

DUC864

CATV

+100

CATV

ERROR

PWR/

GAIN

DUC864

CATV

+100

CATV

GAIN

DDC864

DRMM4

SIGNAL

ERROR

PWR/

SIGNAL

ERROR

PWR/

DDC864

GAIN

PWR/

ERROR

CATV

+100

CATV

SIGNAL

CATV

+100

CATV

+100

CATV

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Summary of DDC864

Page 1
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: set...
Page 2
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 downconv...
Page 3
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 ...
Page 4
Specifications 7 specifications subject to change without notice or obligation. 54 to 864 mhz; off-air channels 2 to 69, catv channels 2 to 135. -30 dbmv to +30 dbmv. 75 ohms, return loss of 8 db 10 db, typical. 55 db. 44 mhz. +30 dbmv, ±1 db. 75 ohms, return loss of 20 db ±5 ppm. 6 mhz saw filtered...
Page 5
Three year limited warranty three year limited warranty three year limited warranty three year limited warranty three year limited warranty r.L. Drake company warrants to the original purchaser this product shall be free from defects in material or workmanship for three (3) years from the date of or...
Page 6
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: set...
Page 7
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 6...
Page 8
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 ...