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In Reply to: what make coaxial cable impedances of 50 ohms and 75 ohms ? posted by lovetube on January 16, 2017 at 18:51:44:
This applies to RF and digital transmission, not audio signals....
In order to minimize "signal reflection" on transmission, the transmitter and receiver impedance must be matched at 50 or 75 ohms. If the cable's characteristic impedance matches the transmitter/receiver impedance, the impedance "seen" by the transmitter and receiver remains at the proper impedance, regardless of cable length. (This does not account for potential signal losses.) This also keeps signal reflections to a minimum, preserving the integrity of the signal at the receiver. In digital transmission, this minimizes jitter induced by signal reflections.
This is why SPDIF digital cables should be rated at 75 ohms. Consumer digital transmitters and receivers are spec'ed to 75 ohm impedance.
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Follow Ups
- Characteristic Impedance.... - Todd Krieger 09:13:33 02/09/17 (0)
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