Help please - How long can you run a 75ohm digital coax cable?

Hi, teo - Thank you!

I ran 30' of quad shield 75 ohm coax and terminated the cable at each end with solder-less RCA connectors, and, it worked! My first test was to verify that I was not introducing a ground loop, it did not. Then playing some Qobuz 24/192 files the secondary Cambridge Dac Magic Plus locked on, reported 24/192 and sounded great. If any jitter was present I could not hear it, the sound was smooth and articulate.

Really appreciate your help, thanks for responding to my post!

It is considered to technically be about a 10M (31 ft) limit, for a 75 ohm spec cable with appropriate termination.

Using a BNC terminated cable, with proper termination at/in the connected devices, with the proper spec cable body, can stretch that out to approx 1km (3100 ft).

AES/EBU balanced as a length limit, is considered to be about 100M (310 ft).

Each gets into higher jitter as the cable body lengthens . Or when the signal frequency increases (not quite true). When reaching the limit in length, and trying to use 192/24 digital data, or DSD, one might find the signal is not locked on to properly, or constantly disconnects and reconnects.

ST optical does away with some of this, as problems go. One still has to have good jitter amelioration methods in place, at the receiving end, even when doing everything correctly.