I’ve encountered the not grounded Cable system many times. Or had one show up when a client did a repair with pex pipe as it was grounded to copper pipe. Won’t be the case with the coax in this case.

I’m hopeful that terminating the coax with better connectors and no adapters will fix this as the hum issue seems to be isolated to the cat6.

Cable company installers are often a hazard because they don't attach their feed to the building ground point. This often results in the cable feed shield being many volts above your building ground -- sometimes to the point of being a shock hazard! Without a ground at your building, a wiring problem down the street becomes your problem too. If there is a lightning strike down the block, you'll probably own it too. I've seen sparks when attaching a cable feed. My first step if there is hum is to disconnect the cable feed. This usually eliminates the hum and gives me a big hint as to the cause.

Yeah cable can be troublesome for sure.

I got my RCA ends for coax from Skywalker, so I'm not sure I would apologize for buying them from Amazon.....

The point I was making has to do with adding connections- if the cable ends make one connection on each conductor, it's theoretically more likely that adding another connector will increase the likelihood of failure.

Also, stacking two connectors adds length and the possibility that something will be stressed- subwoofer plate amplifiers often have cheap RCA jacks, even if they're expensive. I have repaired many, but I doubt yours are damaged since the Coax doesn't produce hum.

You posted "This run is about 60ft and the coax isn’t suitable (loss of signal over the distance)" earlier- To prevent adding cost and aggravation, I think measuring the coax for shorts is a good first step- do it with the RCA ends and without- you may find that they're not making good contact. If not, you have the option to use different adapters or replace the F connectors with compression RCA ends. If the cable shows resistance on the center conductor, a little can be overcome with the level controls.

If you have a TDR, you may find that the location of the problem is accessible.

Awesome info. Thank you. I’ll add that in to my trouble shooting.

Sorry but what’s a TDR. Not familiar with the acronym. If the coax turns out to be damaged I can run a new one in the conduit albeit not easily.

Craig

TDR: Time-domain reflectometer.

Wow that’s a cool piece of kit!!

I bought mine at ADI and it was about $70- Triplett, IIRC. SAved my butt a few times by telling me how far the problems were from the end where I had connected the tester. This is why I mentioned that the damage may be found in a place where it can be accessed.

You could ground either end, but if it's un-shielded, yeah, ground both. The metal RJ45s make me lean towards shielded for sure.

When I google it I get this:

[Link: triplett.com]

Would this be a newer version?

Edit: I read some reviews. One complaint is that it does not report on cable health.

It's not only newer, it's much more expensive than mine. I just checked and ADI and theirs start at about $140, including a tone generator. I think mine is probably disco'd, but it does what I need.

Would you mind telling me the model of the one you found at ADI? I searched ADI Canada but only found them over $500. At least the ones that did cable health.

I just found this one on the ADI site-


Triplett LVPRO10

Thank you