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I really like the quality of the DTV reception, it's either perfect or nothing at all. |
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Not only will DTV transmitters continue to broadcast on the VHF-High band, there will be more transmitters on VHF - not only VHF-High (Band III), but also on VHF-Low (Band I and Band II) as well. Soon, ALL US broadcast TV will be on channels 36 and below. The spectrum auction paid TV stations to switch from UHF to VHF (low or high), switch from VHF high to VHF-Low (Including the legendary public TV station WGBH), or give up their spectrum altogether (and even these have the option of remaining licensed TV stations, including must-carry status on cable and satellite providers, if they could find a transmitting station that would sell or donate some of its bits). Locally, WTLW in Lima, Ohio, moved from channel 44 to channel 4. Last edited by Robert Grant; 11-11-2019 at 09:03 PM. |
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jr |
Audiokarma |
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We've had a channel 9 physical around here since the digital start.
Its not hard to get at all. Lots of people get it on a UHF double bowtie antenna. High VHF would be really easy, even compared to UHF, to get if the FCC assigned just a bit higher power. Low vhf would need substantially more power from the power line than analog, or more bays, to get reliably digital. |
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Hi VHF example: WLS-TV in Chicago, RF channel 7 for both analog (55 kW ERP) and digital (4.75 kW ERP). Low VHF caps: analog 100kW; digital 10 kW or 45 kW depending on location. In general, the licensed digital power is adjusted downward to solve interference issues. High VHF caps: analog 316 kW; digital 30 kW or 160 kW depending on location. In general, a particular station's licensed digital power is adjusted downward to solve interference issues. |
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My residence is 41 miles north of Milwaukee, WI. My workshop is 26 miles north, both a short distance from Lake Michigan.
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jr |
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Is the UHF in Great Britain grouped into "bands", band 1 being the channels 14-30, band 2 is chs. 31-40, etc?
It seems that a broadband UHF antenna like a simple bow-tie, so common in North America since the UHF band brought TV reception to smaller cities in 1952, is not the go-to UHF in the UK. There seemed to be more Yagis, selected bands instead of the entire former spectrum. I have tested over a dozen UHF-only antennas of several types, many vintage and some new ones. Often wondered if "tuning" them to the present spectrum of 470-614 Mhz would make them even better. Looking at 50+ year old antennas still on houses, gives some clue to what works in that location. Many of those cute little imported antennas with built in rotators would do nothing in some of the locations I see upstate in wooded mountain areas, but the simple 4-bay was a miracle to many trying to pull in UHF and a Parabolic to those most desperate for reception. Example: 4 and 8-bay bowtie arrays work better in scattered signal locations such as behind evergreen trees BUT a Yagi or corner reflector bowtie will still have the edge on a weak signal with no close-by obstructions.
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"When resistors increase in value, they're worthless" -Dave G Last edited by DavGoodlin; 08-17-2020 at 12:33 PM. |
Audiokarma |
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UHF in the UK is Band IV for channels 21 -37, Band V for channels 38-68. Antennae are grouped according to which set of channels your local transmitter uses. Wideband antennas are common but give less gain. Most antennas are some variant of a multi-element yagi. Log periodic antennas seem to be getting more popular. They give a flatter response and cleaner polar diagram than a yagi.
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