m_g

hi all, I need to schedule some white lights to be active for 10 minutes each hour while a camera is scheduled to record. Looking to perhaps use Blue Iris or IFTTT to schedule/communicate, or is there an easier way? Open to purchase any type of camera/light combo that will do the job. Any ideas? Thanks

Hi all, Just seeking a little clarification on Hd-sdi specs. I've seen some cameras (KTC for example) where the camera is listed for sale (and even marked on the camera itself) as NTSC). But does this make sense with hd-sdi?? Pal/ntsc is selectable from the menu for the cvbs out, but why would the camera be marked as ntsc, I thought that had nothing to do with hd-sdi. Many thanks, mg

Hi all, I am new here, but have been lurking for a while! As the title suggests, I am trying to setup a GoPro for remote viewing/long term power for a research project, but I am having some trouble with video interference. The system: GoPro 3+ Live feed via USB (composite signal) using GoPro Combo cable (which is terminated with an RCA connector) The live feed is transmitted 50 m via coaxial cable (stranded copper, 95% braided shield), and terminates with an RCA connector to a TV. The camera is powered by a battery eliminator. The power is supplied over 20 AWG stranded copper, run within the same outer as the coaxial, but obviously is outside the coax shield and individually insulated (but not shielded). The problem I'm having is that the video signal is clean and looks good when the camera is run on batteries, but as soon as the power cable is energised, I get some (fairly minor) interference on the monitor, that I would like to eliminate. The interference is there whether I power the long 50 m cable via a 12 v battery (the battery eliminator converts to 4.3 v) or off 240 v AC stepped down to 12 v DC. I have tried all different combinations related to the length of the video cable, length of power cable, batteries, connectors etc. and the common problem in every scenario is that the interference is only present when the 50 m long cable is energised. I thought perhaps there was some common earths between the video and the power (and there may well be), causing a ground loop, but the interference is not present when a short power cable is used-and I assumed a ground loop would be visible regardless of the length of cable (incorrect assumption perhaps??) I have also tried turning off all appliances/lights/mobile phones, and run the camera cable to a 12 v battery powered monitor to remove any potential AC noise, with the same result. Does anyone have a suggestion for a possible solution? Many thanks, mg

I have a client that wants to have their monitor showing their feed with a 20 second delay. They are willing to purchase a whole new system so not constrained by equipment (so could be IP,coax). I basically want to know if this is possible and what gear is required. Thanks a lot

"You will not find a better solution than one designed for the purpose." Yeah, if it does the job properly (and as designed). Can't reason with someone with that mindset.../out

This is why its important to explain why you want something. There is SPECIALIZED software and apps (ios/android) that do this. Simply google it. https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=athlete+video+review+software there are even companies that have specialized software and underwater cameras for swimmers. http://www.swimmingcam.com/ "simply google it".. yeah, I took the time to start a forum discussion on the topic before doing that...geez You mention android/iOS apps. Can you imagine have a pool of elite swimmers in the water relying on an android app to process a delay on HD footage and then replaying it on a tiny screen, all the while fingers crossed that the wifi is working well....?? The reason I wasn't explicit is because of answers like yours. I realise there are lots of people that come on forums wanting to be spoon fed, but you shouldn't assume that's the case with everyone. I am aware of the options out there, they don't do what we need, we need a work around- hence trying to think outside commonly available options

thanks for the answers. The reason for this is for swimmers to review their style once they finish a lap. Cheers

Hi there, When building your own video cable (composite video over coaxial cable, as well as power over a separate pair of conductors), are there some simple measurements that can be taken with a multimeter that will diagnose potential problems with the soldering job you have done? Cheers, mg

Hi all, Thanks for your input. I have actually found the root of the problem, and it is to do with available light. For some reason, in low light conditions, the GoPro produces/is more receptive to (??) EMI, or just is unable to resolve a clear picture. They have always been grainy in low light, but this horizontal interference is new to me. When I put my halogen lights on, the interference disappears. So I am pretty confident that this is more a GoPro issue, rather than a cabling/EMI issue (the cable may be playing some part, but it seems that GoPros are susceptible to grainy pictures in low light anyway-this horizontal interference may be some interplay with the cable, but I fear it will be tough to sort out!!!). I will make sure we have plenty of lights and we should be fine. Thanks again, mg

Kawboy, yes, sorry that was a bit confusing. I have revised my first post to indicate the problem occurs whether the cable is energised by 12 v gel cell battery, or 240 v AC to 12 v DC. The cable is not really able to be changed, it is a custom underwater cable. Im not sure the category (rg 6 etc) but will find out. I am aware of baluns for cat5 cable, but are there some for coaxial as well? Regards, Marcus