icom102 0 Posted December 17, 2014 Hi i am using HD SDI and was thinking of upgrading my cameras i have been told of this new TVI and CVI hd whats the difference or whats the best?? Share this post Link to post Share on other sites
Don Stephens 0 Posted December 17, 2014 Hi i am using HD SDI and was thinking of upgrading my cameras i have been told of this new TVI and CVI hd whats the difference or whats the best?? There are several active threads on here related to this. I would take a look at what's already been said there. The quick answer is that AHD, HDCVI, and HDTVI are all just about the same thing (or will be soon enough). If you're wanting to upgrade from HDSDI, the aforementioned options are not going to give you better image quality; in fact, it will be the exact opposite. An IP system should be your obvious decision if choosing to upgrade from HDSDI. If you're after certain features/capabilities and not just image quality, list them out. Share this post Link to post Share on other sites
icom102 0 Posted December 18, 2014 I was shown a new Hikvision turbo tvi camera and the guy said it was better than what i had whats the story with 4k CCTV is anyone doing it yet? Share this post Link to post Share on other sites
Don Stephens 0 Posted December 18, 2014 I was shown a new Hikvision turbo tvi camera and the guy said it was better than what i had whats the story with 4k CCTV is anyone doing it yet? "The guy" is wrong in regards to image quality, but correct as it relates to every other aspect of the technology. I've got a couple 4K cameras sitting here waiting to be tested but I haven't had time to get to them yet. I will be posting some samples and info on them once I get the chance. As of right now, I happen to think it's a stupid sales gimmick. The industry has long surpassed the 4K resolution. Share this post Link to post Share on other sites
icom102 0 Posted December 18, 2014 So whats better than 4k? Share this post Link to post Share on other sites
Don Stephens 0 Posted December 18, 2014 So whats better than 4k? The 4K resolution translates to be about 8 megapixels (3840x2160). There are IP cameras out there with more than 3 times that resolution. And then there's the 18K : http://www.studiodaily.com/2014/04/so-you-think-4k-and-8k-look-good-behold-this-18k-camera-platform/ Share this post Link to post Share on other sites
icom102 0 Posted December 18, 2014 Do don what cameras would you suggest ? Share this post Link to post Share on other sites
Numb-nuts 1 Posted December 18, 2014 Does anyone know if AHD or TVI can be wired using passive baluns? None of the suppliers are able to answer when I ask the question they all seem to look worried and become speechless? Share this post Link to post Share on other sites
Don Stephens 0 Posted December 18, 2014 Does anyone know if AHD or TVI can be wired using passive baluns? None of the suppliers are able to answer when I ask the question they all seem to look worried and become speechless? I've seen a lot of gimmicky sales pitches where people claim that you can. I know that CVI will work with them, but at a degraded quality. I've only tested one TVI camera with them with similar results, but that was a garbage camera and I'm not going to claim they're all the same. AHD is a total mystery to me. Share this post Link to post Share on other sites
secplus 0 Posted December 19, 2014 Does anyone know if AHD or TVI can be wired using passive baluns? None of the suppliers are able to answer when I ask the question they all seem to look worried and become speechless? I've seen a lot of gimmicky sales pitches where people claim that you can. I know that CVI will work with them, but at a degraded quality. I've only tested one TVI camera with them with similar results, but that was a garbage camera and I'm not going to claim they're all the same. AHD is a total mystery to me. I'll be able to answer this in a couple of days. I have a house that I had pre-wired for an IP system, but due to cost over-runs on the build of the rest of the house, owner decided on a CVI system from Dahua. I already have their PTZ and a couple of the domes up, but I'm waiting on the electrician to put power in the closet where the DVR is, so the minute that's done I'll take some recorded video and stills and post them on their own thread Share this post Link to post Share on other sites
Numb-nuts 1 Posted December 19, 2014 I had this email from one of the Chinese manufacturers and it appears that specific baluns are required for al the new analogue types and at a 2/3 distance I have yet to see these on the market bt I am told that Dynamic in Middlesborough will be bringing these in. Share this post Link to post Share on other sites
Don Stephens 0 Posted December 19, 2014 I had this email from one of the Chinese manufacturers and it appears that specific baluns are required for al the new analogue types and at a 2/3 distance I have yet to see these on the market bt I am told that Dynamic in Middlesborough will be bringing these in. It makes sense that someone would produce something intended for the tech, but I'll believe it when I see it. Share this post Link to post Share on other sites
Numb-nuts 1 Posted December 19, 2014 Frankly I would try and install with the existing baluns but not unless I had the newer ones available just in case. Based on what results I have heard the whole advantage of HD is lost by degraded signals which isn't surprising to me by way of a gut reaction. If I knew how the inductance values affected transmission I might have a better understanding of what to expect but this manufacturer seems to indicate this is an important issue. Share this post Link to post Share on other sites
secplus 0 Posted December 20, 2014 well, I guess we are going to find out in the next week or so if we need special baluns or not....I'll keep you guys posted. Share this post Link to post Share on other sites
Don Stephens 0 Posted December 20, 2014 well, I guess we are going to find out in the next week or so if we need special baluns or not....I'll keep you guys posted. You need special baluns; I can promise you that. The standard passive video baluns I've tested with this stuff have produced video, but only at a fraction of what it's supposed to be. Share this post Link to post Share on other sites
ak357 0 Posted December 20, 2014 You need special baluns; I can promise you that. The standard passive video baluns I've tested with this stuff have produced video, but only at a fraction of what it's supposed to be. Sure u need special balun TVI and CVI use up to 35-40 Mhz bandwidth ( NTSC up to ~5 Mhz ) Share this post Link to post Share on other sites
Numb-nuts 1 Posted December 21, 2014 You need special baluns; I can promise you that. The standard passive video baluns I've tested with this stuff have produced video, but only at a fraction of what it's supposed to be. Sure u need special balun TVI and CVI use up to 35-40 Mhz bandwidth ( NTSC up to ~5 Mhz ) That sounds reasonable, so presumably, one would need true 75OHM BNCs when using coax...? Share this post Link to post Share on other sites
ak357 0 Posted December 21, 2014 You need special baluns; I can promise you that. The standard passive video baluns I've tested with this stuff have produced video, but only at a fraction of what it's supposed to be. Sure u need special balun TVI and CVI use up to 35-40 Mhz bandwidth ( NTSC up to ~5 Mhz ) That sounds reasonable, so presumably, one would need true 75OHM BNCs when using coax...? Yep so far 75 Ohm still here Share this post Link to post Share on other sites
tukangcctv 0 Posted December 22, 2014 I really like of CVI/HDCVI. Seems to be the best option for someone looking to use existing wiring Share this post Link to post Share on other sites
Numb-nuts 1 Posted December 24, 2014 (edited) Today is 24th December 2014 Edited December 30, 2014 by Guest Share this post Link to post Share on other sites
tomcctv 190 Posted December 27, 2014 WOW ITS NOT EVEN APRIL FOOLS DAY Share this post Link to post Share on other sites
