Technical Information
The Sega Channel signal originated in Denver, CO. It was carried over the Galaxy 7 satellite, located 91.0 degrees W longitude using transponder 1 with horizontal polarization.
The uplink signal was at a carrier frequency of 1.435 GHz and occupied 8 MHz bandwidth using QPSK modulation.
The downlink signal was at a frequency of 1.1 GHz and occupied 6 MHz bandwidth using QPSK.
Subscriber Loop
- occupied two 3 MHz non-contiguous channels
- data rate was 6 Mbit/s
- tunable to 68 different operating frequencies between 51 and 118 MHz
- Bit error ratio was <10E-06
- used Quadrature Partial Response (QPR) modulation
QPR is a modulation scheme that uses a controlled inter-symbol interference. The receiver is capable of logically decoding the signal. QPR provides 20% better bandwidth performance than QPSK with only a minor increase in signal power.
This Sega Channel adapter allowed the customer to download the game selected in less than 1 minute. The adapter contained 4 MB DRAM, which held a game of up to 32 megabits (or 4 megabytes) in size. Once the game was downloaded, it worked exactly as if it were a cartridge. Sega also had ratings for each game and supplied the parents with a password (4 digit pin#) if so desired.
Read more about this topic: Sega Channel
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