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DIGITAL TELEVISION an Radio Amateur Perspective by VIRGIL LEENERTS W ØINK ARRL Technical Specialist

DIGITAL TELEVISION an Radio Amateur Perspective by VIRGIL LEENERTS W ØINK ARRL Technical Specialist. Presentation Topics. Short history of TV Channels DTV Channels – pre & post Feb 2009 TV Standards Comparison of ATV & DTV The Over The Air (OTA) viewer. Effects on Amateur Radio.

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DIGITAL TELEVISION an Radio Amateur Perspective by VIRGIL LEENERTS W ØINK ARRL Technical Specialist

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  1. DIGITAL TELEVISIONanRadio Amateur PerspectivebyVIRGIL LEENERTS WØINKARRL Technical Specialist DTV & Radio Amateur

  2. Presentation Topics • Short history of TV Channels • DTV Channels – pre & post Feb 2009 • TV Standards • Comparison of ATV & DTV • The Over The Air (OTA) viewer. • Effects on Amateur Radio DTV & Radio Amateur

  3. Short History of OTA TV Channels • 1948 – Channel One (44-50MHz) was removed for business com & 6 M band. • 1970’s – Channels 70 thru 83 were removed from band plan for cellular telephones. • 2008 – Channels 52 thru 69 were removed from band plan for other purposes. • 2009 – Channels 2 –36 & 38-51 are allocated for TV. (49 DTV Channels) DTV & Radio Amateur

  4. TV RF Spectrum DTV & Radio Amateur

  5. Additional Channel Notes • Ch 37 is allocated to Radio Astronomy. • Even though digital TV has been mandated by the FCC, low power TV stations may remain analog. DTV & Radio Amateur

  6. Local OTA DTV Channels DTV & Radio Amateur

  7. Local OTA DTV Channels DTV & Radio Amateur

  8. List of Channels in State • Complete list of channels for Colorado and Wyoming can be found by using Google and entering “Digital TV Channels, Colorado or Wyoming”. DTV & Radio Amateur

  9. Television Standards • The analog TV standard ( NTSC ) was developed in 1941 by the “National Television Standard Committee” and was modified later to include color television. • The digital TV standard ( ATSC ) was developed about 2005 by the “Advanced Television Systems Committee”. DTV & Radio Amateur

  10. ATV Transmission • Channel Width – 6 MHz • Picture – AM ( VSB – Vestigial sideband – i.e. Lower side band is filtered ) • Sound – FM ( 25 KHz ) DTV & Radio Amateur

  11. DTV Transmission • Channel Width – 6 MHz • Picture & Sound – AM ( 8-VSB ) • Pilot Carrier ( 310 KHz from lower band edge ) • Details in article “What Exactly is 8-VSB Anyway?” by David Sparano. DTV & Radio Amateur

  12. Analog to Digital Levels DTV & Radio Amateur

  13. RF Spectrum of ATV & DTV DTV & Radio Amateur

  14. DTV Reception • Two ways to receive DTV signals. • Digital TV Receiver • OR • Digital TV Tuner connected to an Analog TV Receiver. Also known as a DTV converter which receives DTV signals and converts to composite video. • $40 Coupons – WWW.dtv2009.gov DTV & Radio Amateur

  15. The OTA Viewer • DTV can have many programs channels for one RF channel. Including HDTV programs. • DTV is less susceptible to power line and other pulse noise – clearer picture. • DTV is more sensitive than ATV by about 6 to 10 dB. • DTV stations can be adjacent to each other. DTV & Radio Amateur

  16. DTV and Amateur Radio • Interference to an DTV signal will be difficult for the viewer to discern source. • Interference level for DTV & ATV is about the same level relative to signal strength. • Locally Ch 2 is moving to Ch 34 (UHF) which is good for 6 meter operators. DTV & Radio Amateur

  17. Conclusion • Overall, DTV is a “Win-Win” • DTV better utilizes RF spectrum. • DTV transmitters are more efficient. • OTA viewers have more program channels. • OTA viewers have clearer pictures with better resolution and less interference. • Amateurs in CO front range will have less interference issues because lower VHF channels will be vacant of stations. DTV & Radio Amateur

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