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Can a digital signal travel 100 miles?

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Old 04-12-2009, 05:59 PM   #1
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Default Can a digital signal travel 100 miles?

I am learning allot of great info here. Is it possible under PERFECT conditons for someone to pick up a station 100 miles away or is it just not possible? I would think with some luck and flat open LOS to the tower it COULD be possible!!

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Old 04-12-2009, 08:47 PM   #2
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1guy,
Its possible to receive the new digital signal from 200 miles +...
Quote:
under PERFECT conditons
I'm learning to... I'm not sure what you mean by "LOS" but I have been using a directional antenna to pick up a few stations in the new digital signal that are turning off there ol analog signal soon.

I hope this helps.

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Old 04-12-2009, 11:22 PM   #3
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Yes, if you have line of sight digital reception is possible up to 150 miles maybe more.

An instance: Albuquerque NM broadcast towers are located on Sandia Peak NE of Albuquerque at about 10,600 ft. elevation. This gives these channels great reach and if you live on the north slope of some of New Mexico's southern mountains you have LOS (line of sight) to these towers.

According to TVFool, If I lived on the mesa (flat top) of some of the mountains 15 miles west of Capitan NM (about 125 miles south of Albuquerque) my NM(dB) out of Albuquerque is in the low +30's and in addition I can also pick up stations out of El Paso, TX (120 miles South) with a NM(dB) in the mid to lower +20's.

If you can get line of sight it is not improbable that you could get good reception 200 miles away, just getting LOS is the problem.

P.S. There are places in the Rio Grande Valley 90 miles SSW of Albuquerque that have NM(dB) above +40 from these Albuquerque stations, meaning they possibly could get reception with an indoor antenna those 90 miles away.
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Old 04-13-2009, 05:55 AM   #4
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If the earth was a perfect sphere, the amount of drop in 100 miles would be about 6657 feet. At 50 miles the drop is only 1664 feet.

The slight joker in the deck is that my antenna and the transmitting tower are both elevated some.

The jim5506 point of grab up the nearest tall mountain for your transmitting site is all well and fine in certain select areas, but if you live in a basic penaplain area like I do, the nearest mountain is very far off. According to my TV fool report, my farthest line of sight station is 25.9 miles, as I recall our OP loses LOS closer than that. And once you get into 1 edge or 2 edge diffraction, all bets are off as the signal is governed by other laws than just LOS.

And if we consider the deep fringe starting at 55 miles, and signal diminishes at the square of distance, its only 30% as strong at 100 miles.

But in certain rare cases the troposphere can act like a lens, and allow someone incredible distances away to receive a clear signal.
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Old 04-13-2009, 11:12 AM   #5
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Yes, if you have LOS, no amount of distance should be a problem, provided a reasonable amout of power is used (for a true, optical line-of-sight, about 5 kW should do, until the loss to the square distance rule becomes too severe - like beyond the Clarke Belt).
After the LOS (actually transmitter tower LOS + receiving antenna LOS) is exceeded, signal strength starts to fall greatly with increased distance (far more than simply the square of the distance), more so at UHF than VHF. Normal reception of weak signals well beyond LOS is from edge refraction, and may be susceptible to multipath effects from moving vehicles, and interference from other stations, making reception unreliable.
Now, if the question becomes just how far a DTV station -can possibly- be seen, under abnormal conditions, there may be no simple answer. Personally, my own most distant DTV reception to date is 1,010 miles - and others have done better than I.

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Old 04-16-2009, 05:40 AM   #6
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I live in Middlebury Vermont and receive all my TV stations from Albany, NY, approximately 110 miles to the south. I have almost a clear line of sight to the transmitters in that direction, and use a large VHF/UHF antenna, with a secondary Yagi to grab a couple UHF stations transmitting at a slightly different bandwith. Also the standard Radio Shack Pre-Amp 30db.

Its amazing what you can do with good conditions. For me the UHF stations travel better than the VHF.
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Old 04-16-2009, 10:46 AM   #7
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Quote:
Originally Posted by 1happyguy View Post
I am learning allot of great info here. Is it possible under PERFECT conditons for someone to pick up a station 100 miles away or is it just not possible? I would think with some luck and flat open LOS to the tower it COULD be possible!!

Thanks
When the tropo season starts here, the Richmond, & Norfolk, VA stations come in quite frequently in the DC area.(85 to 175 miles) Other than that, the best distant signal that is "always" there , but not quite decodable 24/7 is WBOC-DT 16 in Salisbury, MD.(80 miles) When the strong analogs go dark, DX'ing possibilities should improve somewhat.

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Old 04-17-2009, 12:33 PM   #8
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There was someone here a few months back who posted their TV Fool info from high up in the Sierra Nevada mountains, and they were getting strong LOS signals from the San Francisco locals some 150 miles away.
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