DRAKE SCT3860 Service manual

The transcoder then applies cable environment FEC to

this stream and remodulates using QAM modulation that

occupies a nominal 6 MHz wide cable channel slot. QAM

modes up through 1024QAM are supported.

The RF upconverter then upconverts the IF QAM signal to

the selected output channel - any standard EIA, IRC, or

HRC CATV channel or a broadcast off-air channel

frequency in the range of 54 to 860 MHz.

Bandpass flatness and phase noise are very closely

controlled in the SCT3860 to insure a high MER and S/N

ratio of the output signal. This insures that the transcoder

will not introduce a source of errors into the distribution

process. Because the MPEG2 transport stream informa-

tion is not modified by the transcoder, all encryption,

authorization, and program guide information is passed

on to the CATV set top box, unchanged.

GENERAL DESCRIPTION

The R.L. Drake model SCT3860 is a

professional quality, modular, digital headend component

providing QPSK or 8PSK input to QAM transmodulation

and RF upconversion functions in a single module. Up to

ten SCT3860 modules and a power supply module can

be accommodated in the RMT150 rack mounting tray,

occupying only a 2 unit (3.5”) high rack space. The

SCT3860 can transcode DigiCipher II or DVB digital

satellite signals, included those with advanced turbo

satellite FEC modes, outputting QAM modulation.

The SCT3860 accepts L band RF inputs between 950

and 2150 MHz from the LNB at the satellite dish. The

transcoder demodulates the selected satellite QPSK or

8PSK signal. The forward error correction (FEC) imbed-

ded in the data stream is used to help retrieve an error

free digital transport stream containing the desired digital

programming multiplex.

SCT3860 General Description / Installation and Mounting

INSTALLATION AND MOUNTING

Install the SCT3860 transcoders in the RMT150 rack

mounting frame. Slide each module into the tray so that

the "F" connector extends though the front panel hole, the

LED is properly aligned behind its front panel hole, and

the hook shaped projection on the bottom of the module

engages the rear of the mounting tray. Secure the

module with the supplied standard 1/2 inch "F" connector

mounting nut and nylon washer.

Similarly, mount the PS151 power supply in the RMT150

tray, making sure that the LCD display and control buttons

line up with their corresponding holes in the front panel,

and that the hook shaped projections on the rear of the

unit engage the rear of the mounting tray. Secure the

unit in place, with the supplied Philips head black

screws, from the front panel. Connect each SCT3860 to

the PS151 with the cable included with the SCT3860.

Each SCT3860 can connect to any one of the ten sockets

on the power supply. However, to minimize confusion, it

is suggested that the left most unit (as viewed from the

front panel) be connected to power supply socket

number 1, the second from the left to number 2, etc.

Connect the LNB signal to each SCT3860 module at the

front panel connector. Connect each SCT3860 RF output

"F" connector on the rear of the unit to the output com-

biner. The Drake model LBS2250 is a combination LNB

L band multiswitch/amplified splitter in addition to a CATV

output combiner. It provides these functions in only 1 RU

of rack space. Also, plug the cable from the front panel

fan module into the FAN POWER receptacle on the rear

of the power supply. Plug the line cord from the PS151

into the AC power source. SCT3860s can be mixed with

SCT1860s, SCT2860s, or SCT4860s and one PS151.

When installing the RMT150 tray of transcoders, it is not

necessary to leave a vertical airspace between the

transcoder tray and other equipment unless that other

equipment specifies that a space should be left open.

The air flow through the transcoders and power supply

has been designed to allow immediate adjacent

mounting of multiple RMT150 trays with SCT3860

transcoders and PS151 power supplies installed. Of

course, air spaces may be left in between RMT150s if

desired.

RF OUTPUT

POWER

RF OUTPUT

POWER

RF OUTPUT

POWER

RF OUTPUT

POWER

RF OUTPUT

POWER

RF OUTPUT

POWER

RF OUTPUT

POWER

RF OUTPUT

POWER

RF OUTPUT

POWER

RF OUTPUT

POWER

RS232 OUT

RS232 IN

1 2

3 4

5 6

7 8

9 10

FAN POWER

100 - 240 VAC

47 - 63 HZ, 125 W

+12

GND

ENTER

UNIT

SELECT

DRAKE TRANSCODER SYSTEM

ID 1.1

12.45 dB

L BAND INPUTS

Order From:

800-423-2594

www.multicominc.com

[email protected]om

SCT3860 Controls and Connections

FRONT PANEL CONTROLS AND INDICATORS

F1 - LCD Display - This displays the PS151 or selected

transcoder parameter and its setting.

F2 -UNIT SELECT (Left) and (Right) Buttons -

These select either the PS151 power supply or one of

ten SCT3860 transcoders. Information from the selected

unit will be displayed on the LCD display for parameter

adjustment. When either button is pressed once, the

LED of the selected transcoder will blink for about 3

seconds, but the unit selected will not change. The

second press within 3 seconds will increment ( )or

decrement ( ) to the next higher or lower numbered

unit. The PS151 power supply menu falls between

transcoder numbers 10 and 1.

F3 - (Left) and (Right) Buttons - Use the left or right

buttons to navigate from screen to screen to view a

parameter setting. This will not alter any settings. If in the

adjust mode, stop at the parameter you wish to adjust and

use the (up) and (down) buttons to adjust.

F4 - (Up) and (Down) Buttons - Use the up and

down arrows to adjust a parameter value when in the

adjust mode. When not in the adjust mode, pressing the

(up) button will display the software version readout,

and pressing the (down) button will display the QAM

modulation output baud rate readout.

F5 - ENTER - Use the ENTER button to enter the adjust

mode or to save and load a new setting or settings. Hold

for 2 seconds until the display flashes to enter the adjust

mode. After adjustment using the up or down arrow

buttons, press again to save and load the new settings.

You may save one parameter at a time after it is adjusted

or wait until all adjustments are made and press to save

and load all at once.

F6 - FAN - One of five front panel cooling fans. To ensure

proper cooling, do not block these openings.

F7 - L BAND INPUTS - These are the L band inputs from

the LNB. The level must be between -70 and -25 dBm.

The L band frequency range will be in the 950 to 2150

MHz range.

F8 - LED - The LED on each SCT3860 will blink on and

off for approximately 3 seconds when that unit is selected.

When in the adjust mode, it will blink continuously. When

in the normal mode, it will be lit continuously whenever

power is applied.

REAR PANEL CONNECTIONS

R1 - RS232 OUT - This RS232 serial connector can

connect to the RS232 IN connector on another rack

containing a PS150, PS151, or PS100 power supply

(included transcoders could be SCT860, SCT1860,

SCT2860, SCT3860 or SCT4860 transcoders), thus

allowing computer control of multiple racks of these units

with the same PC connection.

R2 - RS232 IN - Connecting this RS232 serial connector

to the serial port of a personal computer equipped with

Drake RS232 remote control software, allows remote

monitoring and programming of each transcoder. Alterna-

tively, can be connected to the Drake SCTeci. No connec-

tion is required for front panel control.

R3 - Fan Power- Connect the two conductor cable from

the front panel fans to this connector.

R4 - Power Out - These connectors are for connecting

the power cables from each individual SCT3860 to the

PS151 power supply. The other end of each cable can be

plugged into any one of the ten transcoders. However,

to minimize confusion, it is strongly suggested that the

left most unit (as viewed from the front panel) be con-

nected to power supply socket number 1, the second

from the left to number 2, etc. Do not attempt to use any

power supply other than this Drake supplied model.

R5 - Power In - This connector supplies power and

program control to the SCT3860. Connect a cable from

this connector to the appropriate connector on the PS151

power supply (see R4 above).

R6 - RF Output - This is the QAM output channel RF

output. The frequency range is between 54 and 864 MHz

depending upon the channel selected. The output level

is +25 to +40 dBmV, nominal, adjustable in 1 dB steps.

NOTE: Although the above discussions refer to the

SCT3860 transcoder modules, other Drake transcoders

may be mixed with SCT3860s in the same RMT150 rack

mounting tray. These include the SCT1860, SCT2860,

and SCT4860. The PS151 power supply/control module

will recognize each type of transcoder.

Also, SCT860 transcoders, although controlled by a

different power supply model, the PS100, can have the

RS232 control 'daisy chained' with the PS150 and PS151

controlled transcoders.

F3F4F5F6

ID 1.1

12.45 dB

ENTER SELECT

UNIT

DRAKE TRANSCODER SYSTEM RF OUTPUT

POWER

R4 R5

+12

GND

100 - 240 VAC

47 - 63 HZ, 125 W

FAN POWER

109

7 8

5 6

RS232 OUT

RS232 IN

Order From:

800-423-2594

www.multicominc.com

[email protected]om

SCT3860 Specifications

Specifications subject to change without notice or obligation.

SATELLITE INPUT

Frequency Range:

Tuning Increment:

Acquisition Range:

Input Level:

Input Impedance:

I/Q Phase Imbalance:

I/Q Amplitude Imbalance:

Mode:

FEC:

VITERBI Autoscan:

Turbo QPSK modes:

Turbo 8PSK modes:

Input Data Rate:

QAM OUTPUT

Output Impedance:

Output Level:

Display Error:

Level Adjustment Increment:

Frequency Range:

Frequency Plan:

Broadband Spurious:

Broadband Noise:

Phase Noise:

Frequency Stability:

QAM I/Q Phase Error:

Channel Amplitude Error:

Carrier Suppression:

MER:

Mode:

Symbol Rate:

FEC:

RS232 CONTROL

Data Link:

RS232 Input:

RS232 Output:

GENERAL

Operating Temperature Range:

Size:

Weight:

Power Requirement:

950 MHz to 2150 MHz.

500 kHz.

±5.0 MHz minimum.

-25 dBm to -70 dBm.

75 Ohms, return loss of 10 dB minimum.

<1 Degree.

<1dB.

QPSK, 8PSK.

DCII, DVB, advanced Turbo modes

1/2, 2/3, 3/4, 5/6, 6/7, 7/8 - DVB

5/11, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 7/8 - DCII

1/2, 3/4, 2/3, 5/6, 7/8

2/3, 5/6, 8/9, 3/4, 4/5

2 Mbaud to 30 Mbaud.

75 Ohms, return loss of 10 dB minimum.

+ 25 to +40 dBmV, displayed.

± 2 dB maximum.

1 dB, nominal.

54 MHz to 864 MHz.

Standard, IRC, or HRC CATV channels

or off-air broadcast channels.

-60 dB, 5 MHz to 900 MHz.

-75 dBc, 6 MHz bandwidth.

-103 dBc/Hz @ 10 kHz offset.

± 5 kHz.

<1 degree.

<1 dB.

45 dB.

>40 dB, with blind equalizer.

16, 32, 64, 128, 256, 512, 1024 QAM.

1 Mbaud to 7 Mbaud.

ITU-T J.83 Annex A or Annex B.

4800 baud interface to PS151 via power

supply cable.

DB-9 connector on PS151 for connection

to modem or PC.

DB-9 connector on PS151 for connection

to additional transcoders.

00C to +500C, ambient.

1.1" W x 3.4" H x 13.25" D.

1 lb. 6 oz.

All voltages are provided by the Drake

model PS151 power supply. PS151

power requirement: 90 to 260 VAC / 150

W, maximum w. 10 transcoders powered.

SPECIFICATIONS

Order From:

800-423-2594

www.multicominc.com

[email protected]om

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