Newbie shield question

[babyboo 0]

I apologize if this has been asked before. Running a camera to watch my puppy in the yard using the TV Vid input. I bought a old pelco and a used compression tool off e-bay. From what ive seen on youtube people are just removing the shield when using BNC compression fittings- so the shield does not contact the connector. My television has no ground prong.

So if the shield is to be grounded it aint gonna get it from the TV. I saw some vids on you tube with the hex crimp type BNC connector that looked like they were folding the shield over to make contact with the BNC connector body. Confused. I havnt crimped any thing yet it all seems to work fine with the rg-59 just sitting in the connector. I could get a pigtail of the shield outside of the connector and run ground to it. Or i could ground the old pelco camera body and try to contact the shield at that end.

My questions are

1. Using best practices should the rg-59 shield contact the camera bnc connector outer shell when the monitor (TV) is ungrounded?

2. Using best practices should the the rg-59 shield contact the TV RCA connector outer shell when the monitor (TV) is ungrounded?

3. After implementing best practices from the above two questions should I run a ground wire to the shield on one side of the run ?

 

I know its probably doesnt make a difference for what im doing but I like to get things right. Whew this is a bit more than d-types.

 

Thank You

Ben

[Soundy 1]

My questions are

1. Using best practices should the rg-59 shield contact the camera bnc connector outer shell when the monitor (TV) is ungrounded?

2. Using best practices should the the rg-59 shield contact the TV RCA connector outer shell when the monitor (TV) is ungrounded?

Nevermind best practices, this is the ONLY way it should actually work. Without both the signal wire and a signal ground, there should be no video.

 

If there IS video without the coax shield attached to the connectors at both ends, there's something wonky somewhere else - potentially something that creates a hazardous situation.

 

3. After implementing best practices from the above two questions should I run a ground wire to the shield on one side of the run ?

No.

[babyboo 0]

Thats a horse of a different color. I thought the shield was like the foil shield on belden eight conductor or such. The shield in cctv rg-59 is a signal path. The shield must be making some contact in both shells for it to work now. I am at least not completely ignorant now. You not only want contact you must ensure robust contact.

Why on earth numerous internet searches only brought up talk of grounding the shield and only on one end to avoid ground loop? Why you tube only discussing "removing" the shield prior to compression. Antenna applications? Anyway Thank You very much for your reply.

[the toss 0]

Why on earth numerous internet searches only brought up talk of grounding the shield and only on one end to avoid ground loop? y.

 

That is a technique to eliminate earth loops often used in audio setups & can be quite dangerous. It is earthed at one end to provide EMR shielding while the signal return uses the power earth. By breaking the shield earth you are breaking the earth loop between two pieces of equipment . eg mixer & equaliser

[Soundy 1]

I wouldn't say it's OFTEN used in audio practice... a broken shield connection on one end is relatively common in *balanced* lines (like mics, and "professional" equipment interconnects), where there are actually two signal lines, but not on unbalanced coaxial lines. In fact, in 25+ years in pro audio, I've NEVER seen a situation where an earth ground was *intentionally* used as a signal path return. If there was ever a ground-loop problem, we'd break the loop by using a ground-lift on the power, either with an appropriate adapter, or by flipping "ground lift" switch that some gear comes with.

 

I *have* seen instances where an earth ground was *inadvertently* working as a signal path - setups where a signal would work even though we later discovered a broken shield on a cable - but NEVER where it was done that way intentionally. It's not even a safety matter... it's just not a reliable way of getting a signal return.

 

I don't know what videos the OP is watching, but I think he's missing something in the translation.