Digital Amateur TeleVison

Check These DATV Presentations

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ARRL - TAPR DCC 2015 Proceedings on Digital-ATV - by W6HHC

Topic:  Update on DATV-Express exciter for Digital-ATV

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.

The old technology of analog-ATV suffers from susceptibility to snow and multi-path ghost images. Digital-ATV (DATV) using new technologies like digital modulation, and Forward Error Correction (FEC) can result in robust video reception where analog-ATV fails, as well as providing more narrow bandwidths on the ham bands. This presentation will review progress by the DATV-Express Project Team since DCC2014. These new efforts include:

  • Making the exciter more portable by Hardkernel ODROID U3 Single-Board-Computer
  • Support of Narrow-BandWidth DATV down to 0.5 MHz
  • Using Express_Server software to provide video by UDP
  • DatvExpressServerApp software on Windows (no Linux)
  • DatvExpressSdrApp software for FM and SSB (no linux)
  • A brief report on the European MiniTiouner USB-based Receiver Project

TAPR DCC 2015 DATV-Express Slides (.PPT)       TAPR DCC 2015 DATV-Express Slides (.PDF) 

 

ARRL - 2014 SW Div Convention - Presentation on Digital-ATV - by W6HHC

Topic:  Latest Advances in Digital-ATV

Abstract:  The old technology of analog-ATV suffers from susceptibility to snow and multi-path ghost images.  Digital-ATV (DATV, using new technologies like digital modulation, and Forward Error Correction (FEC) can result in robust video reception where analog-ATV fails, as well as providing more narrow bandwidths on the ham bands. The presentation will review the various DATV protocols available to hams. Recent efforts by F6DZP to use very-very-low Symbol-Rates are discussed. This presentation will also include a quick overview of the DATV-Express exciter/transmitter for DATV, developed by a team of four hams….using SDR architecture. Future plans include making the exciter more portable by investigating ARM-based  Raspberry Pi, RikoMagic MK802iv, and Hardkernel ODROID U3 Single-Board-Computers.

ARRL 2014 Convention DATV-Advances Slides (.PPT)     ARRL 2014 Convention DATV-Advances Slides (PDF)

 

ARRL - TAPR DCC 2014 Proceedings on Digital-ATV - by W6HHC

Topic:  SDR-Based DATV-Express exciter for Digital-ATV

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.

The project's hardware board design has the capability to go well beyond just DVB-S transmission. The design has proven be able to transmit any waveform of up to 10 MHz bandwidth using SDR techniques; including DVB-T, DVB-S2, ATSC and SSB. The current product utilizes Ubuntu OS running on a PC. The presentation also describes work being done to use the design on GNU Radio. Future plans include making the exciter more portable by using an ARM-based ODROID U3 Single-Board-Computer. The current product is in production.

TAPR DCC 2014 DATV-Express Slides (.PPT)

 

ARRL - TAPR DCC 2013 Proceedings on Digital-ATV - by WA8RMC and W6HHC

Topic:  DATV-Express - a Testing Report

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 2013 presentation in the proceedings provides a report on bench-testing the prototype boards using DVB-S protocol.. The project's hardware  board design has proven in tests 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.

TAPR DCC 2013 DATV-Express Slides (.PPT)

BATC 2012 Convention - Presentation on DATV-Express - by G4GUO

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)

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ARRL - TAPR DCC 2012 Proceedings on Digital-ATV - by G4GUO and W6HHC

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.

TAPR DCC 2012 DATV-Express Slides (.PPT)



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 DATV Slides (.PPT)     TAPR DATV Proceedings Paper (PDF)



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.

TAPR PSR Paper on DVB-S Modulation (PDF)



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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