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#9
July 20th 07, 12:58 PM
posted to rec.radio.amateur.antenna
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Yagi Antenna
Dave Platt wrote:
In article . net, Duane Allen wrote: If your using the antenna for HDTV, you need only the UHF elements, which for many TV antennas are the shorter elements at the front end of the antenna. The VHF elements will not be needed when all OTA TV stations go to HDTV. I believe that this statement is untrue, or is at least of somewhat limited (regional) truth. Although most TV stations have chosen to use UHF-band for their digital signals, that is not universally true. Some stations whose primary (NTSC analog) transmitters are in the VHF high-band (channels 7 through 13) have decided to use their VHF channels to carry ATSC digital, after the Big Switchover occurs. In a very few areas of the country, there's even a station or two which will be using its VHF low-band frequency slot (channel 2 through 5) for ATSC. The FCC has recommended against using VHF lowband channel 6 for ATSC, in order to prevent interference with the bottom of the FM broadcast band. I believe that these stations are electing VHF for ATSC, rather than using their "interim" UHF channel assignment, because they'll be able to get better ATSC signal coverage that way. They can operate at higher power on the VHF band than they could on UHF (likely because their interim UHF frequency assignment has co- or adjacent-channel users not all that far away). In most areas of the country, a good UHF antenna will suffice for ATSC digital. In a few (e.g. SF bay area) you'll still need to have an antenna capable of both UHF, and VHF high-band, to get all of the local stations... and in one or two areas you'll still need a full-range VHF-lowband/VHF-highband/UHF antenna such as is used today. Some people who have bought "digital TV" or "HDTV" antennas (UHF-only) are likely to be annoyed, when they lose a channel or two on The Big Day. A nationwide table of the ATSC frequency assignments can be found at http://hraunfoss.fcc.gov/edocs_publi...C-06-150A1.pdf Thanks for taking the time to correct my error. |
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