1 / 17

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.

Thomas
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related