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To: dvdw© who wrote (51378)	6/15/2009 1:45:10 PM
From: elmatador	Respond to of 219863

Triangular Noise was the first time I found useful to look to molecular world. It was exciting. We had receivers into which microwave entered, and was amplified for processing. Due to free space attenuation related to weather (the microwave links operated at 7.5 Ghz) the signal would get weaker. Thus requiring more amplification would cause the amplifier to heat up, boosting the triangular noise. The transitors' molecules were banging themselves against each ther and causing thermal noise. There were three type os noise, basic noise, (which is inherent to the devices' components), intermodulation noise, (caused by imperfections on the amplifiers and on the levels of signals travelling plus frequencies modulation with each other) and the thermal or triangular noise. and we had to measure it to see how it affected the whole usefull band (60Khz to 4.100 MHz) enough for 960 simultaneous phone conversations ot a full TV chanel). Those were analog devices. Today we use digital devices which noise is dealt upon via Forward error correction and clever algorythms that recover the correct train of ones and zeroes at the other end. If this is not enough we create alternative routes and redundancy (HW is cheap today) since crap can't be affect both system at the same time.