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tube tech

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  1. I get solicitations to review equipment. The formula is, you buy the equipment from Amazon and review it. if you write a sufficiently glowing review, they refund your money. if you are not impressed just ship it back to Amazon for a refund. I sincerely doubt that this is an homage to my polysyllabic pettifoggery. more like, get sleazy people to write up things they would not buy without an incentive.
  2. tube tech

    Which cameras to use?

    I'm looking for a different thing. Not a system. parts pieced together. I am an old school electronics tech, ergo a scrounger and cheapskate. my system is massive but inexpensive. most of my cameras are visible only if you look hard. my cheap camera of choice: https://www.ebay.com/itm/700TVL-CMOS-Wired-Mini-Micro-CCTV-Security-Camera-Wide-Angle-3-6MM-Lens/174344059684 I use these lenses: https://www.ebay.com/itm/CCTV-1-8mm-Camera-Security-Lens-170-Degree-Wide-Angle-CCTV-IRCUSN-sh/313260112768 https://www.ebay.com/itm/1-3inch-1-8mm-170-Degree-Wide-Angle-Black-CCTV-Lens-for-CCD-Security-Box-Camera/272594964981 https://www.ebay.com/itm/2-5mm-MTV-CCTV-FPV-Camera-Lens-CL-1180/114168086394 wide angle lenses are far more useful than narrower lenses. DVR: you absolutely must have NTP: the system sets its own time. if multiple DVRs show noticeably different times, the defense attorney can supress the evidence. I use 4 channel DVRs. even a small tv works with 4 images displayed, and you don't have to decipher location from 16 images on the screen. Bummer: DVR network interfaces don't work with any of my browsers in Linux. I can change settings but not view video.
  3. tube tech

    Which cameras to use?

    my problem with those cameras is that you can't change the lens. if you are as old as I am, this is the best description I can provide: think of CCTV lenses as 1/10 the focal length of 35mm SLR lenses. these cameras appear to come with 4mm lenses, very similar to a 35mm focal length SLR lens. in my experience the most useful lens is a 2.1mm. a 2.1 gives you area coverage, with a chance at recognizing the person in the image. a 1.8 gives you vast area coverage, but it's "whodaheckizzat?" even if you know the person. a 6mm gives you face recognition, if the guy stands in a certain spot for a while. you have to give them a reason to linger this system, like all canned systems, is one size fits all.
  4. tube tech

    Recomendations for adjustable systems

    pro cameras. every camera at the price of a good used car. if you are not in the habit of saying "my other Learjet" - no. Secondly, Is anyone aware of any NVR systems which allow the user to set up the recording schedule. the least expensive eBay DVR worth having can do this. it is unlikely that NVRs did not keep the ability.
  5. tube tech

    Cameras Black White

    it would be a tiny little switch on the back. the kind you set with a jewelers screwdriver. I can't find a manual for the camera on the internet.
  6. tube tech

    Cameras Black White

    is there a PAL / NTSC setting? PAL is black and white with pale random colors on an NTSC system. NTSC is American standard
  7. 1) try 2 & 15, Relay 1 common and Relay 1 NO 2) don't run AC through your DVR. use those connections to run an external relay
  8. tube tech

    Networking Course

    do it right. study for Network+ certification. https://www.professormesser.com/network-plus/n10-007/n10-007-training-course/
  9. tube tech

    CCTV setup for farm

    Start with a proof of concept demonstration I would start with an IP camera that displays the focal length. temporarily mount it where you think you might want surveillance cameras, adjust zoom to suit and document for replay. determine needs before committing cash, sell management on more. if you get the coverage you need, and you don't need to PTZ all cameras, get cheap wired cameras, wire them to a DVR in the barn, and feed that to a wireless bridge. they come with either 6mm lenses or 2.1s. I have a pile of unused 6mms. use the focal length determined with the zoom lens above to order lenses off ebay. here in the states you must have the DVR time and date accurate or the opposing lawyer gets the evidence banned from court. this means you need NTP capability. all cameras sync themselves to your national time standard. disable the clocks on the IP cameras if you have them and use DVR NTP as the sole time source.
  10. tube tech

    Waves on monitor

    waves in monitor is typically a ground loop. one ground loop can affect many cameras. take all off line but one, then add them back one at a time until the ground loop shows up. try the camera that ground loops by itself ground loops are typically fixed with a video isolation transformer. I have a ground loop from a camera with a broken ground connection inside the camera. when it ground loops it takes out a second healthy camera on the same DVR. this is not a straightforward troubleshoot and fix situation.
  11. tube tech

    Waves on monitor

    disconnect all but 1. if the waves are gone, put the rest on line one at a time in my system this was caused by a camera with a flaky ground inside.
  12. tube tech

    Strange flickering lines on the screen

    yes, cable is camera, equipment is DVR. it either works a miracle or has no effect.
  13. tube tech

    Cctv wire cut in half

    https://www.ebay.com/itm/5PCS-BNC-Male-CAT5-CCTV-Video-Adapter-Coaxial-Coax-Balun-Camera-TV-Connector-Top/172817905477 https://www.ebay.com/itm/Coax-CAT5-To-CCTV-Coaxial-Camera-Video-BNC-Female-Jack-Balun-Adapter-Connector/252476285422 from China, naturally.
  14. tube tech

    Strange flickering lines on the screen

    what you have is a ground loop. how you cure it is an isolation transformer