Drake SCT3860 8PSK Sat-1024QAM Cable Transcoder

Modular, digital headend component providing QPSK or 8PSK to QAM transmodulation & RF upconversion in a single module. Receives a wide bandwidth QPSK/8PSK input sig from a satellite transponder, demodulates the digital sig, & resends the recovered MPEG2
Manufacturer: Drake
Availability: In stock
Manufacturer: Drake

Drake SCT3860 8PSK Sat-1024QAM Cable Transcoder

The R.L. Drake SCT3860 transcoder module is a professional quality, modular, digital headend component providing QPSK or 8PSK to QAM transmodulation and RF upconversion functions in a single module. It receives a wide bandwidth QPSK/8PSK input signal from a satellite transponder, demodulates the digital signal, and resends the recovered MPEG2 digital transport stream through the cable system via a much narrower bandwidth QAM modulated signal. The end user normally utilizes a set top decoder authorizing the programming to be received.

The SCT3860 transcoder module populates the RMT150 rack tray which holds up to ten transcoders. This modular approach allows the system to be expanded one transcoder at a time instead of requiring the purchase of more capacity than desired. Up to ten SCTx860 transcoders may be powered by the PS151 power supply which also mounts in the RMT150 rack tray. The PS151 power supply also serves as an RS232 communications link for the remote control of up to 70 SCT series transcoders. Additionally, the SCT3860 may be controlled over a local area network or the Internet with the addition of the optional SCTeci ethernet controller interface.

The SCT3860 accepts RF inputs between 950 and 2150 MHz from an LNB at the satellite dish. The transcoder then demodulates one QPSK satellite transponder signal and utilizes forward error correction (FEC) to retrieve an error free MPEG2 digital transport stream containing the desired digital multiplex programming. The SCT3860 transcoder then applies a cable environment FEC to this stream and remodulates it in the QAM format occupying a standard 6 MHz cable channel. Any standard CATV output channel may be selected from 54 to 860 MHz. Because the MPEG2 transport stream information is not modified by the SCT3860 transcoder, all encryption, authorization, and program guide information is passed to the subscriber unchanged.

Although all programming for the SCT3860 transcoder module can be performed at the front panel of the PS151 power supply, the SCT3860 transcoder and PS151 Power supply operate together to provide an RS232 remote control interface which can be accessed by a personal computer. This can be locally or via a modem. Two DB9 connectors on each PS151 power supply provide remote access to up to ten transcoders in that rack tray and permit "daisy chaining" the RS232 cables between multiple power supplies. Up to 70 SCTx860 transcoders in a headend can be monitored or controlled by a single connection. Configuration changes via remote control access can be password protected. RS232 remote control software is provided with each PS151 power supply. A personal computer with the remote control software installed has the ability to control multiple headends including headends utilizing up to 64 SCT860 transcoders and PS100 power supplies.

Key features of the SCT3860 include:

·         Each SCT3860 module may be easily mounted or removed from the RMT150 rack tray to provide for easy expansion or maintenance.

·         Rapid programming for HITS and DISH Network transponders using factory stored preset programming configurations with auto seeking configuration for DISH Network transponders. Auto Seeking configuration for DISH Network transponders.

·         High output power of +40 dBmV which may be locally or remotely monitored and adjusted.

·         LCD for monitoring and setup from the PS151 power supply. Displays QPSK or 8PSK S/N , data rate, output level in dBmV, and other operational data.

·         Remote control functions with monitoring allows changes and activation of "hot" standby units. Controlled over a local area network or the Internet with the addition of the optional SCTeci ethernet controller interface

·         Operates in DVB or DigiCipher II modes.

·         QAM output may be programmed in 16, 32, 64, 128, or 256 QAM modes.

·         Bandpass flatness and phase noise are very closely controlled to insure a high MER and S/N ratio.

·         Can be used with standard or stacked LNB installations.

·         Forced air cooling in the RMT150 rack mount tray allows for cool operation even when mounted adjacent to other components. Fans are easily maintained from the front panel.

·         CW output test mode available.

·         Recommended Accessory: LBA2030 L band amplifier.

·         Recommended Accessory: LBS2250 L Band Splitter with LNB switching and output combiner.

Drake Digital SCT3860 Transcoder Specifications

Satellite Input

Receiving Frequency:

950 - 2150 MHz.

Tuning Increment:

500 kHz.

Acquisition Range:

±5.0 MHz minimum.

Input Level:

-70 to –25 dBm.

Input Impedance:

75 Ohms, return loss of 10 dB minimum.

Front Panel Input Connector:

Type F female.

I/Q Amplitude Imbalance:

< 1 dB.

I/Q Phase Imbalance:

< 1 Degree.



Input Data Rate:

2 to 30 Mbaud.

Forward Error Correction:

ITU-T J.83 Annex A (DVB) or
ITU-T J.83 Annex B (DigiCipher® II).
advanced Turbo modes

DVB Viterbi Modes:

Auto Scan (1/2, 2/3, 3/4, 5/6, 6/7, 7/8).

DigiCipher® II Viterbi Rate:

Auto Scan (5/11, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 7/8).

Turbo QPSK modes:

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

Turbo 8PSK modes:

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

QAM Output

Output Impedance:

75 Ohms, return loss of 10 dB minimum.

Output Level:

+ 40 dBmV, adjustable downward in 1 dB steps.

Display Error:

± 2 dB maximum.

Level Adjustment Range:

15 dB.

Frequency Range:

54 to 864 MHz.

Broadband Spurious:

- 60 dB, 5 - 900 MHz.

Broadband Noise:

- 75 dBc, 6 MHz bandwidth.

Phase Noise @ 10 kHz:

- 103 dBc./Hz @ 10 kHz offset

Frequency Stability:

± 5 kHz.

QAM I/Q Phase Error:

< 1 Degree.

Channel Amplitude Error:

< 1 dB.

IF Bandwidth:

6 MHz.

Carrier Suppression:

45 dB.


> 40 dB, with blind equalizer.


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

Symbol Rate:

1 to 7 Mbaud.

Forward Error Correction:

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

RS232 Control

Data Link:

4800 baud interface to PS151 via power supply cable.

RS232 Input:

DB9 connector on PS151 for connection to modem or PC.

RS232 Output:

DB9 connector on PS151 for connection loop to additional PS151s, PS150s, or PS100s.

Power Requirements

Power Supply:

All operating voltages are providedby the Drake model PS151 power supply from 90 to 260 VAC / 150 W maximum (powering 10 SCTx860s).


Operating Temperature Range:

0° to 50° C., ambient


1.1" W x 3.4" H x 13.25"D.
(2.79 cm W x 8.63 cm H x 33.65 cm D).


1.375 lbs. (0.624 Kg.).

Specifications, price, and availability are subject to change without notice or obligation.

Manufacturer: Drake
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