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• 3Hardware
• 4Software
• 5Installation

G8AJN

These pages are dedicated to Dave Kenward G8AJN who championed the DigiLite project but unfortunately became silent key in June 2017. A full archive of Dave's website that has all of his contributions to the project can be found here http://g8ajn.eyrg.net/

Introduction

The DigiLite Project was the original system designed by radio amateurs to provide a low cost homebrew method of transmitting live digital TV pictures (DATV). It is a derivative of the “Poor Man's DATV System” which many amateurs have contributed to over several years.

The project is no longer under development and not supported - these pages contain the information from Dave's personal web page which has been put here to ensure that the ATV community has access to it in the future.

Hardware

Version 5.9

The most recent version of the PCB was 5.9 featuring SMD inductors for the Nyquist Filter a 6 way header for plugging in an optional sub-board with different filter values to suit requirements. (Provision for fixed values to be used on main board instead if preferred). The modulator IC has a ground solder plane to enable the 70cm device with its ground tab to be fitted.

The 5.9 circuit diagram is available here File:DL5,9cct.pdf

The 5.9 parts list is here: File:DL_BOM2016.xls

Other downloads are:

Software

The DigiLite project runs a number of software modules:

Recording program

GBPVR is a free PVR (personal video recorder) program. Versions up to 1.4.7 have been used successfully. The later version called NextPVR is not suitable. GBPVR requires a certain standard of video graphics card to run, even if you do not actually want to watch the video on that PC. Older graphics card may have problems.There is a setup help page on SOFTWARE sub-page 2.

If the file has a .ts tag instead of .mpg you must change settings as you will not get the DigiLite software to use it.

Conversion program

Digilite Drivers

DigiLite Transmit is the program that reads the recorded data from hard disk immediately it has been written. The data is in Program Stream format, which is very similar to the format used on DVDs. The video and audio are extracted and converted into DVB-S transport stream format, which is the format used by European broadcasters to deliver standard definition programs via satellite. This means that a cheap FTA (free to air) satellite box may be used to receive the transmission. Other data is placed in the transport stream such as date and time, channel name, program name and EPG info. The transport stream data is sent to the serialiser via a USB port.

Configuration

Config is the program that is used to set the symbol rate and FEC and also the channel name and program details. Settings are stored in the Windows registry, which DigiLite Transmit monitors continually to look for any changes in transmission parameters.

Serialiser

This is the device that connects to a high speed (480Mbps) USB 2.0 port and accepts the transport stream data from the PC. . Doing the FEC on the serialiser reduces the data rate over the USB connection.The serialiser has a second communication channel which is used to receive control information from DigiLite Transmit to set the required symbol rate and FEC. The serialiser has been used successfully at symbol rates between 1250k and 6250k. Several symbol rates are pre-programmed into the system. The serialiser board has for an optional SD card socket for playing pre-recorded transport stream files. This function is available on the SD CARD READER page.

Digilite Sound Driver

Modulator

This must be provided with a signal source at the required transmission frequency. It filters the two digital signals (I and Q) from the serialiser and produces an output at the transmission frequency which can then be amplified and transmitted.Most local oscillators designed to use with digital signals will work, but levels may need to be attenuated by up to 20dB . There is a 3 resistor pi attenuator at the input of the modulator board.

Installation

Hauppage WINTV PVR CARD drivers

There are at least three versions of the cards, download the correct drivers for your version of the card from ... http://www.hauppauge.co.uk/site/supportSelect: 'Finding your model number' if you are not sure which version you have.

If you prefer, the external version PVR USB2 can be used.This can be useful for portable work or with a laptop but it must have USB2 ports.

Digilite Driver Support

Hauppage WinTV6

Free if you have an old WinTV install disc in your PC CD Drive at the timeTry running WINTV6 first, if it will not record on your pc use a different program GB-PVR:PVR MPEG2 recording software (PVRX2)On the GBPVR download site, click the smaller green button marked DOWNLOAD 15.22MB.The PVRX2 software works well with the DigiLite software. Versions 1.3.11 & 1.4.7 are ok.Later versions like NextPVR seem to work only with later number WINTV boards.

Digilite Ipms8 Drivers

USB module drivers

Digilite Motherboard Drivers Dl-h61m-vs3

Plug in the hardware and install the USB module drivers. This will need doing twice as there are two USB devices in the one package.FT2322H USB mini-module drivers VCP2.08.14 (download Driver Installation Guide if required)

THE FT CHIP ON THE USB PANEL ALSO REQUIRES PROGRAMMING FTProgrammer v2.2FT2232H setup info now on Software subpage3It will ask you to download (free) MS .NET Framework 3.5 (or later) unless you already have it on your PC.To program the USB chip yourself: see SOFTWARE / FT2232 Install

Digilite Drivers

Digilite Motherboard Drivers Dl-h61m-vg3