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.
rtl-sdr is a generic term for cheap USB digital TV (DVB-T) receivers that use the Realtek RTL2832U chipset, which can function as general purpose software defined radios (receive only). All rtl-sdr compatible devices employ the RTL2832U as an ADC and USB controller, but different RF tuners may be used.