Topic: DATV-Express – Recent Project Progress
Abstract: The British Amateur Television Club (BATC) held a convention in October of 2012 where a presentation was given on the DATV-Express Project. The DATV-Express project was formed to create low-cost solution for Digital-ATV transmission. The open-source project was first announced and described at the TAPR Digital Communications Conference (DCC) in 2011.
This
BATC 2012 PowerPoint presentation provides a report on recent project progress. The
project's hardware board design appears to have the capability to go well beyond just
DVB-S transmission, it should be able to transmit any waveform of up to 8 MHz bandwidth
using SDR techniques. Charles G4GUO reports on recent progress to produce DVB-T and DVB-S2
on the hardware board using new software.
(Also, through the courtesy of BATC, below is a link to a BATC Streaming file of the actual presentation video and audio. This .FLV video file requires Adobe Flash Reader/Player [free] to view. The file is quite large to download – 170 MB Please download that video file if interested and then view on your local computer)
BATC DATV-Express Slides (.PPT) see DATV-Express Presentation Video (.FLV courtesey of BATC)
.
Topic: DATV-Express - a Project Update
Abstract: The DATV-Express project was formed to create low-cost solution for Digital-ATV transmission. The open-source project was first announced and described at the TAPR Digital Communications Conference (DCC) in 2011.
This DCC 2012 presentation in the proceedings
provides an update on the project progress. The project's hardware board design
appears to have the capability to go well beyond just DVB-S transmission, it should be
able to transmit any waveform of up to 8 MHz bandwidth using SDR techniques.
ARRL - TAPR DCC 2011 Presentation on Digital-ATV - by G4GUO and W6HHC
Topic: DATVexpress - a Lower Cost Approach to Digital-ATV Transmitter
Abstract: Modern Digital Amateur Television (DATV) techniques have brought the goal of producing broadcast quality television within the reach of every amateur. No longer are we faced with the demons of the old analog system...like ghosting, poor contrast, improper sync pulse levels and poor color. The considerable improvements in spectral efficiency that DATV brings means also we can do more with our crowded bands. The use of Forward Error Correction (FEC) techniques also goes a long way to mitigate the adverse effects of the RF channel.
Until now the cost-of-entry bar to DATV has been set very high. For those hams not able to obtain surplus broadcast MPEG encoders and DVB-S transmitters it has meant paying over US$1000 for equipment aimed at the ham radio market. This is all changing, read about the exciting developments in low cost entry level DATV. In this paper we describe our DATVexpress project to develop an inexpensive flexible Digital Television transmitter for the Amateur Service using software defined radio techniques and the power of the personal computer.
TAPR DATVexpress Slides (.PPT) see DATVexpress Presentation Video via ARVN
ARRL - TAPR DCC 2010 Presentation on Digital-ATV - by KB6CJZ and W6HHC
Topic: Testing a DATV Station using DVB-S
Abstract: Most ham radio Amateur Television (ATV) stations and repeaters in use today still utilize analog technology. At the 2009 Digital Communications Conference, the authors presented a paper on "Planning a Digital-ATV Station for DVB-S". Now, the authors present the results that were obtained by testing and using the DATV station they had planned. The purpose of this paper is to explain how to set-up and test a Digital-ATV (DATV) station to other hams...and to demonstrate the performance that can be achieved by using DATV. The authors learned a lot about different aspects of DATV during this project. We needed to dig into video resolution standards, better understand the inner workings of MPEG-2 latency, and develop a clearer understanding of the effect of peak-to-average power as related to de-rating a power amplifier for QPSK modulation.
The testing by the authors demonstrates that DATV really does produce higher-quality video than analog-ATV under adverse path conditions!!
TAPR PSR Journal 2010 Paper on DATV - by W6HHC and DC8UE
Topic: Overview of DVB-S Modulation for Digital-ATV
Abstract: The purpose of this article is to introduce a few DATV DVB-S modulation concepts that are typically not understood by hams and even analog ATVers. This paper begins by comparing the PROs and the CONs between DVB-S technology and ATSC technology for use with ham radio D-ATV. DVB-S modulation has an advantage over analog-ATV and other digital-ATV modulations in that the RF bandwidth can be as narrow as 2 or 3 MHz. This article will walk through various DATV factors for determining the resulting RF bandwidth for DVB-S modulation. Finally, the paper looks at the impact of amplifier linearity on the quality of the DATV QPSK transmission.
ARRL - TAPR DCC 2009 Presentation on Digital-ATV - by KB6CJZ and W6HHC
Topic: Planning a DATV Station on DVB-S
Abstract: Most ham radio Amateur Television (ATV) stations and repeaters in use today still utilize analog technology. The purpose of this paper is to explain Digital-ATV (DATV) to other hams, with the hope that it might make the transition from analog-ATV to Digital-ATV a little more straightforward. The paper begins with a review and comparison of various commercial DTV standards that are in use around the world. A top-down design methodology session is then conducted to sort through a number of design alternatives to plan a DATV station. The planning session chooses the DVB-S standard for DATV over the competing United States-based ATSC standard. The paper concludes by describing the Forward-Error-Correction factors and Symbol-Rate factors that determine the RF bandwidth for a DVB-S DATV station.
TAPR DATV Slides (.PPT) TAPR DATV Proceedings Paper (PDF) TAPR DATV Proceedings Paper (HTML) Deutsche Übersetzung (.PPT) Deutsche Übersetzung (.PDF)
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