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si_kungs

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Posts posted by si_kungs

  5. Posted

    I think I am going to win a lot of "false advertising claims". The companies here in the US put 60 hertz on the paper work! I gonna be rich!

    Quote:

    for US it is 50Hz and that means 50 cycles per second

     

     

    for the frequency it should be 60Hz in the US. my mistake

     

    I did not know that!

    Quote:

    power to the houses are AC

    I mean the Voltage from the power outlet supplied by electric company is AC (alternating current)

     

     

    This is what is say in my manual too. I think I have another law suit coming because when I stick my meter on the cigarette lighter it shows 13.8 volts!!!

    Quote:

    also car dash board are 12V DC

     

    the voltage output is a little bit higher. since the equipment has +-10 % voltage tolerance, I think it will do no harm.

     

    also when engine is turned off, power comes from the battery. but when the engine is turned on, the power comes from the alternator of the car.

     

    sorry to confuse you

  7. Posted

    For example those small devices that you can plug in to your cigarette lighter on the dash of your car have more square wave then true sine wave. You will notice that sensitve electronics will not work on those devices.

     

    I took a car battery inside of our house during a major hurricane only to be disapointed that the Play Station II would not work. I really needed to play "kid" cartoons on DVD to keep them occupied while we were without power for two weeks. Two weeks later I finally found a generator at a Home Depot (the last one in stock. It had been hidden by other pallets in the stock room).

     

    Boy does a generator make a difference!! We were without power for another two weeks. A month without power, and yet I still get a bill from Florida Power and Light for usage?????

     

    LOL!

     

    PS Nice graphics si_kungs!!

     

    sir scorpion. Battery has a DC (direct current) output meaning it has a polarity. red terminal is the positive and black terminal is negative. it is like the power for the cameras.

     

    power to the houses are AC (Alternating current) they don't have polarity. that is why you don't need to bother pluging in your appliances at home to check if the terminal is connected in the correct position of positive and negative. AC power is sinusoidal meaning the polarity in the wires switch from time to time. for US it is 50Hz and that means 50 cycles per second. it is like power for DVR, computer, and appliances.

     

    generator produce AC so your appliance can run if it is rated 110V AC.

     

    UPS has an inverter inside that converts DC to AC. so 12 V DC battery power will be converted in to 110 AC

     

    also car dash board are 12V DC.

  8. Posted

    ups is a device that has a bettery and an inverter.

    inverter converts battery power (direct currect DC) to AC (alternating current 220 or 110 but low cost iveter only produces rectangular wave. true sine wave inverter are not cheap. here is an photo of the waves.

     

    80764_1.png[/img]

  11. Posted

    You know some wireless might be worthwhile, as you could have inexpensive laptops in the cabs. Just run IP cams and put an bridge on each machine. Then the boss man can also watch from the office assuming they stay in basically the same areas all day.

    Otherwise I'm with survtech.

     

    since there are many rubber tire gantry in the area. all of them will carry an ap and laptop. will there be an issue regarding the frequency? sir the cabin is may be around 7 storeys high. if the container yard is full, the height of the container will be 5 stack pile and width is i think around 6 containers . will it block the signal from the ap above when the cabin shifts to the other side?

     

    also can the wifi laptop connect ad-hoc to wireless ip camera? haven't tried this yet

     

    also, first make sure they are paying ALOT of money and have good insurance, before you go way up there!

     

    thanks for the advise. need to be very careful when installing in high places

  15. Posted

    BPSB15.jpg

     

    before we used the catenary cable of the equipment and the result is snowy and video been disrupted. may be it is due to the high power lines with the catenary cable. the camera will be mounted only on one side of the equipment, so the operator can see the other side.

     

    80662_1.jpg

    also can this setup work?

  16. Posted

     

    2. Without knowing your floorplan, these are my recommendations for desired views:

    A. Entrance: A good tight shot of the face of whoever is comming in. The entrance is a chokepoint, and is the best place to get the money shot. Make sure this is a top line camera since it will experience glare, bright sun outside, dark store inside, and all that jazz. I'd aim from the top of the door frame down to about the 2' level, and be maybe 10' from the door itself.

     

    B. Exit: Maybe the DVR had a hiccup, maybe the bag guy was wearing a hat, maybe his entrance shot sucked, and frankly you'll want to see what he is exiting with. Again, a top line camera. This one can have a 3.6mm lense. And I'd put it right smack dap in the middle of the top of the door frame looking into the store, but again aimed down in the exit path.

     

     

    3. Power: Go with a dedicated power supply. Altronix is a popular name brand, and has individual fused outputs. Since cameras can be 12vdc, or 24vac, be sure you buy a power supply that meets the camera's need. (Personally I prefer 24vac cameras, but 12vdc work fine too. I've just had bad luck with 12dvc as opposed to 24vac. Others have had the opposite). Run your power on 18-2 wire.

     

    4. Backup Power: Get a good strong UPS and plug the DVR and camera power supply into it. Your alarm has a backup battery, but what good does CCTV do you if it dies with the lights?

     

    2. A & B. sir is auto iris ok for this application? can you provide a specification of the camera that you will be using for this application. also what resolution do we need? what is the fps needed to be set ?

     

    3. is it ok to run a pair of power and connect the camera's power to the wire if it is on the same path of the other camera? or dedicated power for individual camera is better.

     

    4.since low cost ups only produce rectangular wave, is this ok for our cctv system?

  17. Posted

    ok thanks. what do you think sir about using stranded? because when using utp picture becomes snowy and picture sometimes gets disrupted. may be the wire has loosen because of the moving cabin.

  20. Posted

    two camera will be mounted on one side of the equipment and the monitor will be on the moving cabin above. what cables do i need to use? is using a single coax for power and cable advisable( using capacitor to block AC signal for camera and use inductor to block DC signal from power supply?

     

    80662_1.jpg

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