survtech

Here is a link to a wire distance calculator for 9VDC, 12VDC and 24VAC.: http://www.video-insight.com/Support/Tools/Wire-Length-Calculator.aspx

It's a barrier strip. Just a small flathead screwdriver. You can use "telephone wire splice connectors" (Radio Shack Catalog #: 64-3080 or equivalent): Or "beans" (ICO-RALLY Part Number: 7920 / MCM Electronics Part Number: 95-670): Or barrier strips (ICO-Rally and others). Or you can use "66" or "110" punch-down blocks: (requires a punchdown tool)

What is?

You can continue to use RG-6. RG-6 and RG-59 are interchangeable for short runs (less than a few hundred feet) in most applications, as long as the construction is copper/copper. The lack of a copper braid probably means you are using CATV cable, not CCTV cable. Check the center conductor - if it bends relatively easily, it is copper; if it is very stiff, it is probably clad (copper coating on steel). You can also use a small magnet to test the center conductor. If it is clad, it is not suitable for CCTV. RG-6 and RG-59 are both 75 ohm cables, along with RG-179 (mini coax) and RG-11 (large coax). The difference between them is the DC resistance. The larger the diameter of the cable, the lower the DC resistance and therefore, the longer it can be run without excessive signal attenuation. For short runs, there is no practicle difference between the types. RG-179 is usually suitable for runs up to 100ft.; RG-59 can be run up to 750 ft.; RG-6 can be run up to 1000 ft. and RG-11 can be run up to 1,500 ft. This assumes the cables are all constructed using 100% copper conductors. Aluminum and steel have a higher DC resistance per foot and will attenuate low frequency signals more than copper. You might ask why cable manufacturers don't make all cables out of solid copper. The main reason is that high frequency signals exhibit what is know as the "skin effect". This means that the higher the frequency, the more the signal travels on the outside surface or "skin" of a conductor. With very high frequency signals (including TV channels and FM radio), the majority of the signal travels on this skin. With the price of copper (over $3.00/lb) versus steel wire (approx. $.20/lb), it makes sense to produce copper-coated steel wire (clad) for high frequency applications. This is despite the higher production costs of the cladding process. Also, steel is stronger and more resistant to stretching than copper. This makes copper clad steel cable attractive because if a cable is stretched, its impedance and resistance are affected. The downside to steel is the higher DC resistance it has than than copper. CCTV video signals are low frequency; as are audio and AM and LW radio. These applications require solid copper since the signals travel more towards the center of the wire.

Digital data over ethernet is at a much higher frequency than analog video. That's why CAT-5 is typically rated for 350MHz. Analog only needs less than 10MHz.

Check continuity to the camera body. Anything that measures a short should be ground.

Not likely in the near future. Not with the advent of 10Gb ethernet, iSCSI, etc.

"Versa Technology’s Long Reach Ethernet product family extends the maximum driving distance of Ethernet from 500ft to about 4,300ft for 10BASE-T and 1,000ft for 100BASE-TX without using any repeaters." Don't throw away the tool and connectors. Prepare for the future. The future is IP!

Just make sure you do the weird twist in the middle pairs.

Could be, but make sure the connectors are put on correctly for your application. The best choice is switches at no more than 100 meters apart. I read an article recently that said that ethernet repeaters tend to suffer from packet collisions due to their "dumb" nature (inability to re-send missing data). Here's a link to a repeater that looks promising: http://www.versatek.com/products/s-vlr104.htm They're saying that standard ethernet can go up to 500'. Plus, I'd bet their repeater is more expensive than a cheap switch.

100 meters is supposed to be the limit for IP Cat-5. It might go farther at a reduced bitrate. Tools and connectors are dirt cheap and readily available. Here is a link to the connector wiring layout: http://www.lanshack.com/make-cat5E.aspx Make sure you know whether you need crossover or straight-through connector wiring. Patches for patch panels are typically straight-through while equipment-to-equipment cables are usually crossover. This assures that you connect the Tx at one end to the Rx at the other end, and vice-versa.

As far as I can determine, there are no ISC shows in November.: ISC East 2007 is September 11-12, in New York, New York. ISC West 2008 is April 2-4, 2008 in Las Vegas, Nevada. The Global Gaming Expo (G2E) is November 13-15 at the Las Vegas Convention Center. This show is casino gaming oriented and primarily showcases slot machines and other casino-oriented vendors although it is my understanding that this year there will be an emphasis on Surveillance. I will be attending.

what's your meaning? our website cannot be visited? it's in a server in USA. it's hard to visit from some place those who charged the network hard. You need a better chinese-to-english translator, for one. An example: "We can provider kinds of Products:" Should be - We can provide the following kinds of products: Also there are broken links and other web errors.

We have used many brands including NVT, Vigitron, Samsung GVC and others and haven't noticed any appreciable difference.

I love how the media gets Security and Surveillance confused. Anyway, here's a job opportunity in SoCal: http://www.latimes.com/news/local/la-me-heist3aug03,0,1779809.story?coll=la-home-center

How about Dick Hertz?

I found a simple way to maintain the integrity of the shield. After you untwist and splice the shield essentially as one stranded wire, wrap the cable with its shield with aluminum foil or conductive tape, then apply electrical tape or heat shrink over the whole thing.

Barrel connectors don't have a 3db loss. It is more like 1/2db per connector (or 1db per barrel). And if you aren't careful to maintain the correct spacing between the center conductor and the shield, you can mess up the cable's impedance causing standing waves, loss of signal level and ghosts. You could also introduce noise into the signal if you don't properly shield the splice.

Have you tried cleaning the heads on the VCR? Try adjusting the tracking if you have manual control. Also check your tapes for linear creases near the top and bottom. They would indicate problems with the capstan/pinch roller or the guides. Also, make sure the multiplexer is properly set for the correct VCR model and recording speed. Multiplexers need to see a good clean signal from VCR's, especially in the vertical blanking interval (the black horizontal bar between frames that you sometimes see "rolling" vertically on bad tapes). They store information used to determine which channel was recorded on each frame in that area. If the VCR signal drops out near the head switching interval (also located in that same blanking area), which is very common, the multiplexer will not be able to determine which frame is which camera. Therefore it won't play back. If there are no creases in the tapes and cleaning doesn't help, hook up a single camera to the VCR and record and play back the picture in the mode you normally use. If the playback has a lot of black or white streaks in the picture or the picture jumps a lot, you may have to replace the video heads on the VCR.

150ft. is a bit too far for direct PTZ motor and lens control with Cat-5. Typical limits are 50 feet for those functions with 20 gauge wire. Cat-5 is 24 gauge. You could build or buy a relay box and put it in the garage to control the PTZ functions and then use Cat-5 to control the relays. Or you could use RS422/485 on one pair of the Cat-5 to a controller located in the garage. Then you could also use Cat-5 pairs for the video from each camera. You would need one pair per camera (up to 4 cameras per Cat-5 run).

There are a number of very small dome PTZ's coming out recently. You could possibly mount one under an eave with a pendant mount. Cop Security 15-CD51HM Colour/Monochrome SONY Super HAD Mini Pan/Tilt Dome Camera: http://www.cop-security.com/product.asp?id=129

Here you go: http://www.switched.com/2007/08/17/caught-on-tape-ups-guy-throwing-package/

That would be on the small side for a full-size casino. The average is well over 1000 cameras, including more than 100 PTZ's.

Here's a link to the specs and wiring - http://www.cbcamerica.com/cctvprod/computar/zoom/zoompdf/V10Z1618M.PDF It is not auto-iris. It is motorized manual iris.

Fibre would also handle the distance but it is not cheap and requires specialized equipment and training to install. It may be worth it, though, because even active twisted-pair tends to have reduced picture quality at that distance.