Question About Video Picture Quality In Elevator Cars

We recently installed analog cameras in 3 elevator cars. The video quality is great when the car is not in use, but as soon as the car starts-up the video quality degrades. We are using an 18/2 shielded cable that was already in the travel cable of the elevators. We began by grounding the shield on the end of the cable at the car. I noticed that the interference was present, I then grounded the shield on the other end in the elevator equipment room, it made no difference. We are sending the analog signal through the 18/2 shielded cable using passive baluns. We then are sending the analog signal into an encoder where it is switched to IP, and connecting to our VMS.

 

Thanks

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***** *** * ****** of ******* ** ***** I ***** **** **** first:

*) ***** ** * chance *** ****** ** damaged/worn, ********** ******* *** indicate **** ********* *** shielding **** ** **********. What **** ** ******** cable ** ** (*.*. braided/coil, ****)? *** *** is **?

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**** ****** *** * value ** ***** ** a ****** *****, **. the ******* ** *** using ***? ***** ***** distance ** **** **** 150'.

*** ********* *** ****** only ** *** ******* room ***. 

***** **** ******* *****, and ** **** ** difference. * **** ************ the ****** ** **** ends *** ** **** no **********.

 

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*** *** ****** ********** in *** ******* ** a ***** ***?

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*** ****** ******* ** a ***** *** ******** such * ***** ***** as ** ******** ***, and * *** *** up ** * ****** cameras ** *** *******.

**** *****/***** ** ******* do *** ***?

******,

*****

******** *******.

** **** **** **** IP ** **** ***** POE/Data **** *-**** *** have *** *** *** issues.   **** ***** ******* a ***** ******* *** putting ** *** *** or ********* *** ****** camera **** * ***** IP ******?