RE: Coax versus twisted pair.

Posted by Jon Risch (B) on April 22, 2015 at 21:21:08

In Reply to: RE: Coax versus twisted pair. posted by beppe61 on April 21, 2015 at 22:57:17:

Your logic chain is not completely valid.

Oscilloscope cable use is not the same criteria as digital cable use, which is not the same criteria as analog signal use.

Without going into all the nitty gritty, as this would take some time to do, and I have posted many posts on audio cables and the theories behind the quality issues, I will give one set of examples for comparison.

In the case of an SP/DIF digital connection, the factors that make for good clean transmission of digital data are different than those for analog signal transfer.

For instance, the main factor for a digital cable is helping to maintain a low jitter signal environment.
This requires tremendous bandwidth, well above the fundamental data transmission frequencies centered around 5 MHz, good shielding and freedom from external noise and interference, and a controlled impedance
environment.

Analog signal transfer has a different set of important factors, good signal resolution at extremely low levels in the uV region, while digital needs to be clean in the middle of the bi-phase signal waveform, where the accurate timing detection of a signal polarity flip is paramount, that occurs around the middle of a 0 to 5 volt range.
Analog does not need a 60 MHz bandwidth or higher to convey high performance audio signals.
Analog signal transfer does not require strict and consistent impedance conditions at the source, along the cable, or at the load.

There are many other factors that come into play for each type of cable, but to say that a cable that performs well for digital or scope use will also perform well for analog signal transfer is an erroneous idea.

Jon Risch

This post is made possible by the generous support of people like you and our sponsors:

Follow Ups Full Thread

Topic - Does this make sense to you ? - beppe61 22:41:52 04/19/15 (21)

RE: Does this make sense to you ? - daleda 11:37:26 04/21/15 (1)

RE: Does this make sense to you ? - beppe61 03:58:50 04/24/15 (0)

RE: Does this make sense to you ? - Jon Risch 21:13:38 04/20/15 (8)

Military has these - unclestu 13:47:16 04/22/15 (0)

RE: Does this make sense to you ? - Crazy Dave 08:19:07 04/21/15 (1)

Ditto! Thanks, Jon....[nt] - alan m. kafton 19:05:40 04/22/15 (0)

RE: Does this make sense to you ? - beppe61 22:55:29 04/20/15 (4)

Coax versus twisted pair. - Jon Risch 20:47:30 04/21/15 (3)

RE: Coax versus twisted pair. - beppe61 22:57:17 04/21/15 (2)

RE: Coax versus twisted pair. - Jon Risch 21:21:08 04/22/15 (1)

RE: Coax versus twisted pair. - beppe61 04:30:15 04/23/15 (0)

Velocity of Propagation - Duster 15:33:53 04/20/15 (3)

RE: Velocity of Propagation - beppe61 10:42:37 04/21/15 (0)

RE: If you look at the patent - Cpk 09:57:07 04/21/15 (0)

RE: Velocity of Propagation - beppe61 23:05:52 04/20/15 (0)

RE: Does this make sense to you ? - unclestu 23:06:55 04/19/15 (5)

RE: Does this make sense to you ? - beppe61 23:57:04 04/19/15 (4)

RE: Does this make sense to you ? - unclestu 00:27:27 04/20/15 (3)

RE: Does this make sense to you ? - beppe61 04:13:48 04/20/15 (2)

RE: Does this make sense to you ? - DeeCee 12:37:43 04/20/15 (1)

RE: Does this make sense to you ? - beppe61 14:22:59 04/20/15 (0)

Follow Ups

RE: Coax versus twisted pair. - Jon Risch 21:21:08 04/22/15 (1)

RE: Coax versus twisted pair. - beppe61 04:30:15 04/23/15 (0)

RE: Coax versus twisted pair.

Post a Message!