supra_06

nice to know. i suspect this power adaptors from china causes the video disturbance, i replaced it with a transformer type and it worked good. thats why im curious. i think i need some seminars

nice to know. i suspect this power adaptors from china causes the video disturbance, i replaced it with a transformer type and it worked good. thats why im curious. i think i need some seminars

i think.. waves from ang electrical current always disturbs an analog video.

using IP cameras maybe. network over power is posible.

you can consider putting the power supplies and the connector near the manhole for car top. so when you have to service the camera you just need to bring the car to lowest stop. temporary shut the elevator down to do the servicing.. anyway.. if u leave any doors open or the cartop manhole open, the elevator is imposible to run. unless your rude elevator technician by passed the safety circuit at the elevator machine room

from the dvr.. run a uto cable up to the machine room, then use a balun.. connect a bnc from the machine room, follow the travelling cable down to elevator car using belden stranded coax RG6.. connect the camera. get power from elevator cartop theres always a AC supply at the cartop. optional to use UPS. i used to be an elevators tech'n before however if the elevator power fails the camera will be using battery and will drain power later. thats the best thing i know as an amatuer. im not that well in technical matters. thats true, never attemp to open any door from any level, tech'ns always have an SOP. it is sometimes fatal.

^i dont worry about the voltage drops and ampere rating issues. i know it. im an electrician. i just dont know it well when it comes to electronics. whats the effect (if there is) of using electronic types or switching types on videos. i am relating it in using vacuum tube type for my guitar amplifier is better in hum reduction instead of using IC types of guitar amps. i need help. *pardon for my grammar. im not an english

^ im not familiar with the terms.. we switch to using this smaller power adaptors that seems to be "electronic/IC types" for me.. and later after several months inferences occurs in videos, then replaced the power adaptors, and it greatly reduces the humming. so i suspect its about the electronic type transformers form china.

im interested with your comments about SMAC-M mullti stream technology that uses independent video streams for recording, transmission over DSL, LAN, etc.. that provides no compromise in transmission speed and recording speed/quality. RX video recording transmitters with alarm managements speed domes cameras

which is better, transformer type power supply or electronic types? for individual power supply running on 220v then goes to a 12v dc transformers? i encounter interferences using electronic type of adaptors for power