cctv_down_under

You can only downlaod as fast as you can upload he data IE if your DVR site only has 300 up then that is all you can download, however th artifacts you are seeing may not be from this issue, it could be a codec issue, but bandwidth can also cause this

********It is possible this info could be incorect, dependant on hardware so I would test on a multimeter first******** But seeing as no one may help you due to not wanting to blow your cam up...here is what I think. Your camera has a 24v option so it supports 12vdc and 24vac, and the power supply you are using is 24vac so it does not matter with polarity, you can plug any wire in (except to the 12vdc option)..so you can for instance plug Red into 24Vac and Black into FGround

Doesn't Geo have it's own (not released yet) Acces control engine.... I really am not sure, I have brochure on it but never read it

Aspherical Lenses are a completely different kettel of fish, spherical abhoration is commonly found on most non aspherical lenses, this condition is caused by using such an easy way to mechanically grind the lens (circular machine polishing), by polishing and grinding the lens in a spherical manner you do not end up with such a precise focal point. The chromatic abberations (colour decomposition of white light) can also effect the quality of recieved light but as mentioned above one of the major factors is actually the profile or shape of the lens. The optical axis is effected largly by shape of the lens, most lenses that are not aspherical have a standard curvature that is very easy to machine, however a aspherical lens has more of a bell shape to it, kind of like a wave with a peak in the middle, these are harder to machine but the effect is that light is better distributed onto the sensor in a more concise and effective manner, meaning (well not exactly) that light is not wasted and falls more evenly on the sensor allowing the sensor to pick up more light and therefore perform better in low light. Some of the advantages of having an aspherical lens are that in some cases you can achieve shorter minimum object distances, wider angles of view and fewer optical elements (because there are less abborations to correct). There are some moulded aspherical lenses in the mrket, these avoid the process of grinding and therefore are much cheaper but this does not guarantee the same glass quality which is a completely different issue. Most people only consider Fstop, size and brand when considering a lens, but IMHO the most important consideration is Lack of abboration, the T.FACTOR (Transmission factor- reliant on the quality of the actual glass and how well it transmits light) and this is often overlooked. The F stop is JUST a measurement and should NOT be the only factor that is considered. ~ I hope this helps

I am not tottaly sure but I think some of that info is wrong rory, IR corrected lenses do help with the focal shift, especially if using an IR cut filter, we all know that the iris changes in low light and this obviously effects field of view, but if using a IR cut filter, then the distance between the sensor and lens has changed as the device is moved away, some cameras use what is known as a Dummy IR filter that slides over where the filter originally was for this reason. I was under the understanding though that some non ir corrected lenses will block the amount of IR light as they have IR treated glass, so I am not sure that it would be accurate to say that the only advantage is focuss shift. I am not a big fan of IR unless you pay decent money and have it seperate to the camera itself IE UF500 etc, I have hardly ever needed to use IR except in conditions where I can not see my hand in front of my face in complete darkness, I prefer to step up to a half inch D/N camera instead as IR is hardly ever needed. As for the interlace caused by delaying the frames, thsi can be managed by good cameras, so you can set it to what you want...the biggest problem people have is they think they should just whack a camera on low light mode and be done with it...which is very wrong to do.. How can a manufactorer know how low your lighting is...so they set there low light mode to a ridiculas "worse case scenario level", most of the low light cameras I have seen on site have been set way to low, causing frame interlacing and more importantly massive noise due to gain. The reason I like the Bosch is becasue you can program it up the coax, meaning you can isntall it and sit in a room and adjust Gain, Level, Frame Interlace, Dynamic Range, Amplification BLC Levels etc all from the laptop, this is great because fractional changes can make such a difference and being able to adjust it a bit at a time with each setting really helps.. If you look at the Bosch Day Night cam with out of the box settings you can see that by defualt it is set so low that it is trying to stay in colour but it is causing massive amounts of noise because of the gain increase... but the other image where I have adjusted the low light settings allows it to switch to B/W and takes a lot of the gain out of the picture (I could have done a lot more). The other reason I like it is because you can do the back focus without having to adjust anything, you just switch it into back focus mode and although it looks like nothing has changed it actually has the same effect as using a Nuetral Density Filter and making the Iris adjustments and there are no screws, in order to dot eh Baxall I had to adjust a screw hold a ND filter and change the DC Level at the same time as focussing. ~ I hope this helps

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Hang about, are these not just standards doen by Les (a cctv consultant) I do not know...nor have I read them yet, but these are not ASIAL or Government standards are they?

Quite impressive, can you please PM or email me prices on the product, also could you please inform us on how big (file size) an average frame is at the current resolution and compression you just displayed (and no not a snap shot)

Bang for buck the Geovision is your best bet, it wil give you the resolution you need and a load of features, however when it comes to such a small install of only 4 cameras, you are sometimes better buying a standalone box, the reason is that either 4 or 8 inputs the standalone box's are very comparative in pricing.. If you buld a Geovision you still need a PC and a card, the bulk of the cost being the PC, so at 4ch it is still cheap, but at 16ch the Geo becomes much cheaper than a standalone box. But if going standalone and only 4ch there are plenty out there that are affordable with such small amount of inputs. I would stongly recommend you go for a 8ch card because I bet your customer will want to upgrade. The other reason I suggested standalone is because a lot of wholesalers sell kits when only using 4 inputs IE they sell a 4 camera package with everything you need. Standalones are limited by speed, hence the PC systems are very popular once the cameras are more than 8.

Most doems come with a surface mount kit to allow conduit to slide in the side, but as you correctly stated you still need to clip the conduit on.....PS I found an awesome tool the other day, it is an explosive tool that puts in U clamps even into solid concrete, you simply lay your conduit and cable on the ground...put a clasp into the gun and in less than a few minutes you have done loads of cable run ...it really is simple becasue you do not need to drill at all

Kindly please stop trying to sell things here, use the correct area

If they are 4 years old then they will be Biphase Protocol

Just use XP embedded

The round plug that you are talking about is the driver for the iris, there should be four wires connected to four pins, in four different colours, I assume it is only supporting Video Drive lenses (if so there will be a level control on the lens...a little trimpot..actually there should be two of them), you just need to take off the plug and get a new one that suits it, the camera will have wiring instructions (if you can find them) as to what colours go on what pins.

Hard to tell from that image, but looks simply like a white surface refelcting a very bright light, try using a diffuser on the light sourse

That Sentry one...loks very similar if not the same, I may have got the figures wrong or it may have been a prototype, whichever it was, it wsa very impresive indeed

Sounds like you have done everything right, from memory there is two audio codecs you can use so try the other one, Audio does not take up huge amounts of bandwidth....be carefull that your audio is not looping and causing noise IE you record ausio at site and it comes through live at speakers, but then the mike is too close to speakers so you record audio egain, causing a continuos loop which eventually wil become a booming type of noise as it builds up, to test cover or turn of mike for a few seconds.

Hello again. I just looked at the demo for connecting up a GV POS System, can anyone tell me what the Graphic Mode Sender is all about, I have up until now just been trying to take the raw data from a com port and feeding it to the data capture box, can you tell me what the difference is and why this program is used. Thanks in advance

Thank you, very nformative, I kind of knew all that but it will be useful for the forum...the one bit I am confused about is....Graphic mode....does this still come out of the com port or is it done through ethernet without th V2E box, I can not understand why you need the box at al, I have set up many without the box, striaght in and without graphic mode software..so what is the difference I thought maybe it was for things like icons etc. No one answered my post about this option: 4 x POS COM PORT ------> 4 x 232/485 CONVERTER (not Geo) ------> GVHUB = (4x 485 to USB Converters) ---------> Gv system. I have tried not using the box and it works for one unit but have not tried standard 232/485 converters (I do not know if GVNet works in both directions) and I am not sure if the GVHUB looks for GV POS Box's or whetehre it is indeed just a 485/USB converter?

DSP would be cheaper, but quad would be easier if you want to determine which cameras are on the second and third monitor and only if they differ....in other words if monitor 2 had different cams than monitor 3 but if they were the same the DSP would suit best

Soon as I get something on it, I will forward it to you guys...just to burst your bubble though I heard it costs around $20,000 per camera, mind you if it does do a whole stand then it is still cheaper

Sorry guys.. 1/ Very new product and the wholesaler will not tell me where it comes from, but getting some edited PDF's sent to me. 2/ Even if I found it, unless I know the manufactorers website I can not list it......RIGHT?

I beleive you can now program the DSP output to whatever you like, so if you have a combo card or a DSP card you should be able to set your output to one extra monitor in the display you want and obviously if you want the same eight cameras on the third monitor then you could just loop that signal out again

Hello, I have tested the Geovision DVR with a POS register....Fristly I tested it with the POS capture Box, but then I tested it without it and it worked fine...my questions are this. 1/ If the comport on the Geo recieves the same data and there is no need for a POS Data Capture Box, is there any deficit in functionality (In other words, just what does the capture box do) I know it is only workign because what the register spits out is obviously the same or close to the protocol I am uing. I also assume that instead of the Data Capture box you could just simply use the RS232 to RS485 converter which is bucket loads cheaper? 2/ The above solves my need for one register, however if I have more than one register then I will need the GV Hub (4 x 485 signals turned into 1x USB), what i would like to know is has anyone tried using a standard 232 to 485 converter and then using the GV Hub without using any data capture box's? 3/ Does anyone have a wiring diagram for pin outs for the GV Data Box, I have a POS system here that requires the printer to be connected at all times, the printer sends a carrier detect back to the PC straight through the POS box, I need a Y cable splitter for DB9 which I can not find anywhere and I have been advised it wil not work because of Flow Control or something like that (all over my head) so I can use another port from the POS pc but pins 1 and 9 have voltage in them so I need to know if the Geo data capture DB9 input ses these pins or not? Thanks In advance Guys

The reason I ask is because if the lens is adjustable in any way then it may be out slightly and this could cause this blooming, but I severely doubt it... I bet it took you an age to get it in there but probably the best advice is to take it out and try it in a normal environment adn see if it still happens, if it is fine in a standard room then I would suggest that either the camera is crapola or the connecting cable (not the BNC) the little plug in at the back top of the square is not fully in or has a broken or bent pin or MOST LIKELY it is overheating.