HeightsCCTV

As the others said, you ideally want to identify the source of the line noise. By what you stated "..cameras on my network..", I presume you have a POE system? If for some reason you don't, you can check to see if your cameras are dual voltage. Sometimes an AC power supply won't reproduce the noise you see with a DC power supply. If you do have a POE system, follow all your cable runs. CAT5/6 should cross wires perpendicularly and where they have to run parallel, make sure they are 1 foot or more away from the parallel run. If you've checked this and you still have issues, I'd look at re-terminating the rj45 connectors. If this has been done and you still have issues, I'd connect a new "temporary" cable to the run to see if the noise is relevant. If not, then you may have a bad cable or you may have missed an area causing the interference. Please post back your findings.

Would also check d router and make sure you have all the correct ports opened..

...or rebranded junk. All those systems listed don't use surveillance specific hard disks...and can easily be taken out with a plastic base ball bat. You don't have to listen to me. But listen to this: In addition to selling and installing CCTV systems, I replace quite a few of those box sets from Costco, Sam's and Fry's. $1700 for a Q-see? Wow! Limited to a 1 year warranty too, even with Costco's Lifetime satisfaction because it has a hard drive. Yeah, a slight delay is no big deal when you're using a surveillance system for surveilling... I have an 8 channel TVI system with a 2 year advanced replacement warranty for $1470 that you can park a dump truck on a camera and it'll still be in one piece. 2TB Western Digital Purple drives...meant for surveillance. In addition to the waste that Newbieman was suggesting, the motion zones on that Q-see system are limited and (aside from selecting or deselecting a grid) have no customization. Also...cables...limited footage in the box. So you have a 20' run and you want to cut down that POE latency a bit...well you have 80' spooled up that doesn't get used. Even if that system WAS on sale for $1300, read the reviews! Was a little late responding, been busy replacing systems that Boogieman was suggesting.

Did you make your own cables or is this from a box? Are you using an NVR, POE switch or PCI/PCI-e card? What is the distance from NVR/POE switch to camera? I'd try to switch out the cable to start with.

Why POE? And if you're going with POE, it wouldn't be a "dvr" it would be an NVR. Typically, I've found that POE cameras usually cost more that POW cameras as well. Many POE cameras have the ability to have SD cards internally and I usually only price someone a POE system if they are in need of that feature, don't have the money to buy an NVR/DVR, they are in need of a POE featured system or their home is prewired with CAT5/6 already and it's not feasible to replace the wire. Going to be difficult to find any "non-china junk", 8 channel NVR under $1k USD. Entry level, 8 channel, 1TB name brand NVR is around $1500 compared to an entry level, 8 channel, 2TB name brand DVR for $350. Not really apples to apples, 10 year warranty compared to 2 year advanced replacement.

I agree with zr1, for what you're wanting to do, that is a total waste of money. Get a 16 channel NVR, log in remotely via web browser, access the footage, save and back it up to thumb drive, e-sata drive, additional internal drive, etc. No need to burn anything. When you return to the NVR location, simply remove the thumb drive/e-sata drive, connect and boom, done.