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 (click for details).
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:
You may download the owners manual in Adobe® Reader format
by clicking here. |
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If you don't have the Adobe® Reader, click here. |
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Satellite Input |
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| 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. |
| Modes: |
QPSK or 8PSK |
| Input Data Rate: |
2 to 30 Mbaud. |
| Forward Error Correction: |
ITU-T J.83 Annex A (DVB) or |
| 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 |
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QAM Output |
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| 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. |
| MER: | > 40 dB, with blind equalizer. |
| Modes: |
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. |
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RS232 Control |
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| 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. |
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Power Requirements |
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| Power Supply: |
All operating voltages are provided by the Drake model PS151 power supply from 90 to 260 VAC / 150 W maximum (powering 10 SCTx860s). |
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General |
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| Operating Temperature Range: | 0° to 50° C., ambient |
| Size: |
1.1" W x 3.4" H x 13.25"
D. |
| Weight: |
1.375 lbs. (0.624 Kg.). |
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R.L. Drake, LLC |
Sales: 937-746-4556 |
