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Is there an online database of the frequencies of high-definition television?

In particular, I am using a Pinnacle TV Center USB TV Tuner Pro in Washington, DC. A channel scan picked up NBC-4, FOX-5, and 66, ION, but not ABC-7, CBS-9, MNT-20, PBS-26, CW-50, or others. I know that these stations are there, because I can get on my real digital TV tuner, and I see here: http://en.wikipedia.org/wiki/List_of_television_stations_in_Washington, _D.C. I would try to manually add these channels. PCTV me know the actual frequency in MHz to add channel: 4-1 676.250 MHz, for example, 604.250 MHz is 5-1. Does anyone know where I can find a list of frequency channels that I miss? It would be great if there was a database of this information somewhere, but I am especially interested in the resort areas of Washington, DC. Thanks!

The following link provides the screen and the real (physical) channels in the area stations Washington DC. You have correctly determined that the channel '4 'is actually transmitted in the cap. 48, which is a center frequency of 677 MHz and a bandwidth of 674-680 Here is how to determine MHz center frequency of digital television in the United States: Ch 2-4: 6x + 45 channel number Ch 5-6: 6x + 49 the number 7-13 Ch Channel: 6x + 135 channel number Ch 14-51: 6 x channel number + 389 Each channel is 6 MHz wide, to add and subtract 3 Mhz each center for a wide freq band channel. Example for the CH. 2: 6 x 2 = 12 + 45 = 57 MHz Channel 2 is about 54-60 MHz, and the center is 57 Mhz. For emphasis, is the strength (physical, or "RF") channel is not the screen (or "virtual" channels). Get specific frequency sub-channels, ie, "4.1" can be tricky. Note that "4.1" Received cap is the fact. 48.3. It seems logical that your USB tuner is more concerned with bandwidth of 6 MHz frequency channel or subchannel central database, which is variable.

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