If youâve spent any time online searching for a used car, youâve probably seen ads for manufacturer-backed certified pre-owned (CPO) programs offered through dealerships. While you may be tempted to avoid heading to the dealerâcars for sale by private owners can be found all over Craigslist and other third-party sitesâa CPO vehicle can be a good choice for some buyers.
In the context of a CCTV camera TVL (TV Lines) refers to the horizontal resolution (the maximum number of vertical lines the camera can resolve) of the CCTV camera. TV Lines are the standard measure of an analog TV's Resolution. Rather than represent discrete locations on a grid, as Pixels in a digital Frame do, TV Lines indicate the maximum number of identifiable changes that can be produced along a single (horizontal) Scanline of an analog TV.
Satellite television is a system of delivering television programming using signals relayed from communication satellites. The signals are received via an outdoor parabolic reflector antenna usually referred to as a satellite dish and a low-noise block downconverter (LNB).atellites used for television signals are generally in either naturally highly elliptical (with inclination of +/â63.4 degrees and orbital period of about twelve hours, also known as Molniya orbit) or geostationary orbit 37,000 km (23,000 mi) above the earth's equator.