Doug Lung /
08.15.2008 12:00 AM
EDN Writer Tries Off-Air DTV – Part Two
Electric Design News (EDN) senior technical editor Brian Dipert continued his tale of off-air TV reception in postings last Friday and this Thursday. Last week Jack Antonio, chief engineer at Reno, Nev. Station KTVN, along with his assistant, Eric Brown, visited Dipert, who was having trouble receiving the station, even though he was able to receive other stations on Slide Mountain, outside Reno.

It turned out the cable in his house was attenuating the high VHF DTV signals by 8 dB. After reviewing the specifications, the engineers confirmed that the Clearstream 2 antenna from Antennas Direct was a UHF-only antenna. Dipert asked Antennas Direct Founder and President Richard Schneider to explain the company’s claim of “consistent gain” through the entire DTV channel spectrum. Schneider responded that designing an antenna that would cover both bands without compromising UHF reception turned out to be harder than expected. The solution they came up with was to redesign the antenna balun to allow the feed line to act as a high-band VHF antenna. The ClearStream 5, a high-band VHF only antenna, is recommended for viewers in fringe areas with high-band VHF reception problems.

In my RF Technology column in the Sept. 3 issue of TV Technology magazine, I’ll look at spectrum usage after Feb. 17, 2009. One quarter of all U.S. TV stations will then be using VHF channels.

See Brian Dipert’s Thin-Air ATSC (And NTSC): An Engineer Visit and An Antenna Reposit for the full story. Also see Thin-Air ATSC (And NTSC): The De-Boost (or Over-Boost) Debacle describing Dipert’s experiences with TV preamplifiers.


Comments
Post New Comment
If you are already a member, or would like to receive email alerts as new comments are
made, please login or register.

Enter the code shown above:

(Note: If you cannot read the numbers in the above
image, reload the page to generate a new one.)

No Comments Found




Thursday 10:05 AM
NAB Requests Expedited Review of Spectrum Auction Lawsuit
“Broadcasters assigned to new channels following the auction could be forced to accept reductions in their coverage area and population served, with no practical remedy.” ~NAB


 
Featured Articles
Discover TV Technology