Timeline for Can I use 50 ohm cable with 75 ohm tv antenna?
Current License: CC BY-SA 4.0
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| Dec 9, 2021 at 2:01 | comment | added | Math Keeps Me Busy | @SteveSh "Do you really think this will be noticeable"? For analog video? Absolutely. The reflection will appear as "ghosts". Especially noticeable if there there are sharp contrasts, say a block of dark with bright white lettering. Digital video will not show any degradation unless there are other sources of noise, and the reflection pushes the total noise past the threshold. | |
| Dec 9, 2021 at 0:53 | comment | added | SteveSh | OK. But when the reflected signal is reflected again back at the source, that reflection is also 1/5 amplitude. So the twice reflected signal traveling back to the destination is down in amplitude by 1/5 * 1/5 = 1/25. Plus there's some loss in the coax going both ways. Do you really think this will be noticeable by the receiver? | |
| Dec 6, 2021 at 19:15 | history | answered | Math Keeps Me Busy | CC BY-SA 4.0 |