3 ms·
The incoming signal is turned into 4000 bits per second then XORed with a large pseudorandom sequence.[1]. It's quite interesting what was possible given such l
by mikewarot 2y ago
The incoming signal is turned into 4000 bits per second then XORed with a large pseudorandom sequence.[1]. It's quite interesting what was possible given such limited hardware at the time.
I've seen multivibrators as frequency dividers in the repair work I've done. The clever thing here would be in the initialization, and synchronization at the receive end. I'd imagine that wheel has to be spun up to some fraction of 4000 rotations/second and uses photodiodes or perhaps just contact, to generate the starting pulses.
[1] https://www.turing.org.uk/sources/delilah.html https://www.turing.org.uk/sources/delilah.html
- ASalazarMX 2y agoI'm frequently amazed how technological advance frequently is making things smaller/faster/cheaper, not inventing or discovering them in the first place.
- mystified5016 2y agoTrue innovation is very expensive and very risky. It's unpalatable to most companies, so the best we've got is incremental improvements.
- deleted 2y ago[deleted]
- ASalazarMX 2y agoThis is what government-funded universities should be doing, unprofitable research that automatically becomes public domain.