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Kiwi

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Posts posted by Kiwi


  1. In my year on this board I do not recall this HD issue come up before. Setting "master" by jumper should override the cable's choice of "master" on the drive, don't see that the ATA interface has any bearing on, or knowledge of this.

     

    My 782 works fine with the several drives I have tried set to master, not to imply it's the same design as the 760.

     

    Trying to get in contact with AVtech should be interesting. If you can do that you've truly accomplished something!


  2. It is sensible to add a fan. Whether one is absolutely needed or not is unsure, but in my experience if there is a overheating problem you will get hard drive fail errors and it reboots, with no permanent damage done. You may also want to select an HD that does not overly exceed the minimum performance requirements as it may require more cooling.

     

    My 782 had a fan installed but due to the restrictive fan grill it didn't do anything useful, hence the HD errors. I changed it for one twice as thick and cut out the grill. Also added a small fan under the HD tray. Cut a round hole in the tray and glued it in place. Works great now.

     

    Can't help with the power connection but someone here with a 760/761 burnt out their power board by installing a 1/4 amp fan, so would suggest great care. Those little fans are about 1/8 amp.


  3. Everything is normal except the HD not working. When you attempt to power off there should be a message on the screen asking for the password.

     

    The beeps are normal, if not annoying.

     

    It goes without saying - try another HD, make sure the connector is not upside down (just in case it's not keyed) and the power connector is working.


  4. Yeah, if the camera's BNC shield and power "gnd" are connected together at the camera, and then your power supply (-) and DVR chassis are also connected together 40m away then the benefits of a balanced twisted pair may be not be fully realized.

     

    I guess that means use a single isolated power source per camera.


  5. I think the purpose is just to give you an impression of the activity, not evidence for a court case. I find it's plenty clear enough for that. For users who have a lot of daily activity, 4x larger files could be a problem too.

    Still, it should be configurable.

     

    I use a php viewer (sfpg 2.0.0) on the target web site so that I can quickly review the pics thumbnailed onto the page.

     

    Rumor has it these DVR's use embedded Linux, and perhaps hackable.

     

    84440_1.jpg


  6. IP cameras still require proprietary activeX for what he needs to do.

     

    Not sure if there aren't other ways. I can get an image from my Arecont at the command line using "wget", an http utility. For example this will save an image to the current directory with the name image.jpg:

     

    wget "http://:8008/img.jpg -O image.jpg"


  7. The wireless doorbell I used has battery power at both ends, I guess that's why it was cheap ($11.) The pricey ones have mains-powered ringers. Works easily to 100' line of sight.

     

    The terminals you mention on your existing PIR, what are they intended for? i.e. what's the configuration and voltage/current rating?

     

    It surprises me no one makes a battery-powered PIR with remote wireless ringer.


  8. Hmm, I used a cheap wireless doorbell to do something similar for a remote gate. Mine rings and triggers my DVR.

     

    A minor issue is that you just want a momentary signal to the transmitter, not the several-minute period the light would be on, otherwise the noise will drive you bonkers.

     

    If the PIR had no auxiliary output there is a current sensor available that will detect anything over 0.4 amps AC and provide a solid state switched output.


  9. Wow, it really is "the wild west!" That sort of crime should be a hanging offense to match, whether he hit someone or not.

     

    The clerk was really lucky the robber was not expecting him to open fire, yet it's damn fortunate he had the presence of mine not to wait.

     

    Sadly, this happens here too but the clerks are not allowed to either own firearms or use them. One was shot and killed three weeks ago in Auckland, even though he complied. In fact if a clerk here did what happened in that video he would be prosecuted. The robbers would get a short sentence since they "missed."


  10. I think plates in many parts of the world are like this. The reflective material is diffuse so angle should not be so much of an issue. It's the huge amount of IR from the incandescent motorcycle-style combo tail and brake light that is the problem. The street light is probably sodium or mercury, pretty minimal in IR I would assume. The camera is more sensitive to the IR than the human eye so that's why it's washed out in the plate area on video.

     

    A more extreme IR filter may help, as might a wide dynamic range camera, but since the brightness is localized auto exposure will still try to adjust for the entire scene and keep the plate washed out.

     

    A solution might be to add a second, parallel daylight color camera on the same scene which would be better suited for that level of light.


  11. Well, from the theoretical point of view clearly extra current capacity is not going to help directly with voltage drop.

     

    But as you have noticed and survtech has pointed out, 24 VAC transformers and older style (or cheaper) 12 VDC power supplies (based on line frequency transformers) tend to have poor regulation and so often output a higher voltage at lighter loads to make up for it. So that gives you a bit of extra headroom for wire losses.

     

    Modern general purpose 12 VDC switch-mode designs have excellent regulation and normally nothing to allow for voltage drops. Over the entire current range it might not vary more than 0.1 V.

     

    Next to ensuring voltage drops are minimized, the ideal solution is to use a supply with an adjustable voltage output if the wire voltage drop will cut the voltage supplied to the camera below its minimum allowable value.

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