Ever wondered how they transmit your TV signal?
David Kilpatrick from TXAustralia takes us on a detailed tour of the old decommissioned 10kW analog TV transmission system at the Artarmon facility in Sydney. It is still used to transmit digital TV. How it all works from the broadcaster video input to final transmission output up the 180m broadcast antenna. Plus some teardowns of the old equipment that’s been used to transmit the Channel 7 TV signal in Sydney since 1981.
Copper rigid coaxial lines, waveguides, filters, splitters, combiners, converters, transmission valve, power supplies and all the equipment necessary to transmit a 10kW analog or digital TV signal in a major city like Sydney.
EEVblog #569 – Tour of an Analog TV Transmission Facility - [Link]
This is a TV transmitter to generate a stream containing four TV programs and broadcasts it on a frequency in the DTT standard.
Ideal for stacking in an antenna system, audiovisual channels generated on-site or from other sources like a decoder for satellite television.
With this project you can make a small local TV station that has up to four TV channels. You can also integrate into a system into other existing TV signals that will be transmited on a desired RF channel. It’s ideal for exclusive cable installations for a condominium, a hotel, company premises or public place.
This merges 1 to 4 television channels in one stream of output that is ready to be transmitted on air (with the help of a linear RF) or injected in a localized cable TV circuit.
Using DTT to create your own TV transmitter - [Link]
Exapod ported TV-B-Gone, the universal TV off button, to the tiny PIC12F1840. He used the free version of the Hi-Tech compiler so the optimizations leave a lot to be desired, but the code only uses 17% of program memory. The prototype was made on a protoboard and an SOIC packaged PIC.
TV-B-Gone ported to PIC 12F1840 - [Link]
Silicon Laboratories Inc. released the industry’s first single-chip hybrid TV receiver family designed to simplify the design of TVs, set-top boxes (STBs), Blu-ray recorders and PC accessories. The new receiver family includes the Si2185 hybrid receiver, which combines a digital/analog TV tuner, a multi-standard analog demodulator, and DVB-T and DVB-C demodulators into a fully integrated, monolithic solution. The receiver family also includes the Si2115/13/11 digital-only receivers designed for DVB-T and DVB-C digital STBs offering terrestrial and cable reception.
The new Si2185/15/13/11 receiver family enables TV and STB developers to eliminate numerous external components such as surface acoustical wave (SAW) filters, tracking filter inductors, wirewound inductors and low-noise amplifiers (LNAs), thereby simplifying their designs and reducing BOM cost. The receiver family’s unprecedented single-chip integration can enable a total system savings of up to 75 percent compared to more complex two-chip solutions. [via]
Industry’s first single-chip hybrid TV receiver - [Link]
Flyback transformers are found in monitors, TVs or anything with a CRT, and are sometimes known as Line OutPut Transformers, or just LOPT. They are used for generating high voltage for the CRT, which is needed to create an electric field, which in turn accelerates electrons towards the screen, which finally excite phosphors and create the image you see. Flybacks are designed to work best anywhere between 15 to 150 kHz, so some experimentation is required to find the intended operating frequency. TV flybacks are generally designed for upper audio frequencies, which is the cause of the high pitched noise heard from a muted TV.
Flyback Transformer Drivers - [Link]
Japanese Maker Satoshi Shibuichi built this impressive looking analog television set (translation), which uses vacuum tubes to display video on a tiny CRT monitor. Schematics and photos of the build are available at the website, however if you’re thinking of building one, you should act fast.
Homebrew analog TV – [Link]
This LPC2138 microcontroller-based application converts a standard television into a high-functioning oscilloscope. The digital storage oscilloscope has a sampling rate of 160,000 samples per second and generates high-resolution video at 512 × 240 pixels. Neither a video controller nor extra RAM are required. Five different voltages on the five analog inputs can be monitored simultaneously. [via]
ARM TV-Based Oscilloscope – [Link]
This article describes the design of a Text on TV project. It takes serial data and displays text on a TV screen. The hardware part of this project is pretty simple. It uses an Atmega8 microcontroller that runs with a 16 MHz crystal. The article provides the details on PAL and NTSC timing signals, as well as how to implement the signals in software. [via]
Monochrome Composite Video using Atmega8 – [Link]
This must be the smallest TV-B-Gone implementation, a device that can switch off almost any TV set. µTVBG is small enough to fit in your pocket and it is based on the ATTINY85 implementation by Lady Ada. All parts are SMT 0603 parts, the transistors are the good old BC850C and as IR diodes the author used the Osram SFH 4600.
uTVBG – World Smallest TV-B-Gone clone - [Link]