TVSharp 1.2 – analog TV tuner on RTL-SDR.

TVSharp - analog TV tuner on RTL.

Sake of expanding horizons wrote toy program for analogue TV broadcasting dongle, based ADSB #. Did not expect that people will be interested program, but it was popular and interesting for radio amateurs.

Key features – shows only black-and-white image with no sound. The maximum resolution of about 100 lines horizontally and 580 vertically. Understands standards Secam Pal – 625 lines at 50 frames per second, NTSC – 525 lines at 60 frames per second. Interlaced scan. AM modulation video.Basic program settings:

[Tuner] [RTL] [Program AGC] switch types of AGC. If the signal is included in the limit of the excess gain to the inscription “Tuner gain” (gain tuner), added the word “Overload” (overload). In this case, reduce the gain of the tuner or to switch to another type of AGC. Software for TV signal AGC maintains optimum gain level.

[Gain] manual gain control at the tuner AGC disabled.

[Frequency correction] set of parameters tuning the tuner frequency. [Roughly] – coarse frequency tuning tuner hardware is implemented. [Fine] – Fine tuning is implemented programmatically. [Auto correction] – single rough automatic frequency tuning. Automatic adjustment only works with a good signal sync pulses on line scan, if the signal is weak, the adjustment does not work properly.

[Position correction] set of parameters adjust the position of the picture. [Auto] – including automatic synchronization for the horizontal and vertical sync pulses sweep. [X, Y] – manual adjustment of the position of the picture when automatic synchronization is disabled. Frequency stability and RTL television transmitters tuner allows you to receive a television signal is very weak without synchronization on personnel and horizontal sync with manual adjustable picture position and frequency correction. Example receiving a weak, reflected from the ionosphere, the TV signal from the Ukraine in Scotland with the help of this program and manual synchronization Pictures. Sound received by the second receiver and TVSharp to do.

Of course, frequency and dynamic range RTL tuners full reception of TV signals and can not require much from this program is not necessary.

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Source code …