Unfortunately, DTV signals are line-of-sight so anything from a building
near the Tx tower ten miles from you or the woods, trees, hills, general
terrain, etc., can make a weak signal fluctuate. It's normal to lose
reception during storms, snow, rain or even high humidity in some cases.
The higher the channel frequency (not the channel number you receive on),
the worse the symptoms will be.
We're in a fringe area and have an 80 dBm amp running in order to get
anything to come in and you should see how bad it gets here! Digital has a
considerably shorter reception range than the old analog signals. Our
gummint critters are work.
On 01/14/10 10:37 am, news.eternal-september.org wrote:
Actually, No! We had flaky analog pictures on some channels but
crystal-clear HD on the digital channels on the same TV with the same
antennas (two antennas pointing in different directions to deal with the
widely spread transmitters).
Not always the case. My digital signals are much better than the analog
ones used to be and I haven't lost any stations in the switchover. I
can't pick up the San Bernardino PBS station digital signal (about 60
miles away), but then I never could get their analog signal either.
A few comments: DTV signals are no more 'line of sight'
than analog signals were. The degree of loss from not being
'line of sight' depends solely upon the RF transmit
frequency rather than if the modulation is analog or
digital. DTV signals do suffer more from dynamic multipath
What is an 80 dBm amp? Is that the same as (80-30) dB?
I bought 30 feet of cable to try my antenna at various indoor and
outdoor locations. I bought an amplifier because it would have been a
good idea with UHF analog using that much cable. I never tried the amp
because I discovered I could get all the channels indoors on the ground
floor that I could get outdoors 30 feet above the ground. That
convinced me that a few dB of gain wasn't important with HDTV.
One station 80 miles away would break up in some weather conditions.
Reception improved if I turned the antenna 90 degrees from the
transmitter. That must have reduced my gain by a lot of dB. I wouldn't
have received anything at all with UHV analog, but digital worked.
I think multipath distortion from a reflection off the sky was causing
the breakup. I don't know how turning the antenna helped. I was
unaware of that kind of distortion with analog TV, perhaps because the
ghost image was offset by only a millimeter or so.
I'm on a hill. My BIL is in a hole three miles from me. When we both
had rooftop antennas, my reception was better than his. He couldn't get
analog reception after he took his antenna down. He watched recorded
I told him to try HDTV indoors. He had a cable and a 4-bay bowtie
antenna. He paid $6 for the only balun available at Radio Shack. He
couldn't get any channels, but when I unscrewed the balun and put my
finger on the center conductor of the cable, he received some channels.
Apparently that balun was causing reflections what would have been
acceptable with analog TV.
I gave him a 25-cent balun and he was in business. He gets most of my
channels and some I don't get, down in a hole with his antenna indoors,
80 miles from some of the transmitters. I doubt he has line-of-sight
reception on any channel.
A good old style UHF corner reflector antenna s working great for me,
I picked it up at rogers flea market for 10 bucks. come spring I will
put it on the peak of roof with rotor. currently is ty wrapped to my
chain link fence post.
weather was too cold for much else, on most channels its 90+ signal
sears sells this. its a digital video recorder. its time based
recordings not name based like tivo but works well, and is high def.yu
can start watching a show while its recording which you cant do with a
I am REALLY PISSED AT DISH NETWORK. I am a 13 year subscriber. they
kept programing package prices the same, but hiked their fees
dramatically if you have more than one receiver. 17 bucks a receiver
plus other fees is insane
I've had the exact same experience here. My antenna is highly
unidirectional. It should need a rotator to point it exactly to each
transmitter for each different channel. But that just doesn't work
here. I do recieve good signal over a wide area with the antenna
aproximitly 90 degrees off. For one PBS station I need to rotate it but
even that is iffy if it will work pointing to the tower or turn it 180
degrees and it picks up good signal from the rear of the antenna. I
never know which is going to work best that day.
can't do much about aircraft,but if strong storms or high winds are
affecting your reception,perhaps your antenna is not aimed optimally,or
it's mounting is not strong enough. One thing,though;10 miles may actually
be -too close-,as you may be UNDER the station's antenna pattern.
Thus the need for an outside rooftop antenna.
WRT the xmit power issue,many stations REDUCED xmitted power after a trial
period. They wanted to save on their electric bill.
I also lost a low-VHF station(Ch.2) in the conversion.
It's NBC,so no great loss.
I bought 5 or 6 antennas, tested them out, and returned the rest. The
most expensive antenna was worse than average. Antenna
selection/positioning will take some trial and error work, but once
it's done, that's it! Comcast must hate me because I got many
neighbors into using power antennas.
maybe you should try that Make TV homemade antenna,it uses coathanger
wire,a small board,some screws and washers,and a 75:300 ohm matching
transformer.I get pretty good results with it,no amplifier needed.
It's a "quad bowtie" type of antenna.
OTA isn't my primary reception method, but I'm about 40 miles from
most San Francisco TV transmitters and I get nearly 50 stations
(including subchannels) with an indoor bowtie. I'm in the flatlands,
so my view of Sutro Tower is not blocked by hills.
You'll need to go to TVFool.com or AntennaWeb.org and put in your
address to see what the likely results would be at your house.
Because of frequency, power, and antenna height changes (and sometimes
even antenna location changes), your experience could be better or
worse with the digital versions of specific local stations.
Also, alt.video.digital-tv is a better place to get information.
Watch out for the rabid pro- and anti-digital TV posters, but if
you've been on Usenet for long, you already know to avoid the
people with agendas.
I had poor reception with analog: severe ghosts on strong stations and
severe snow on others. In preparation for going digital, I bought a
so-called HDTV amplified set-top antenna. It made strong and weak
stations much better.
That antenna was terrible when I got a digital TV. I got an old 4-bay
outdoor antenna out of the closet and made a stand by sticking a pipe
onto the pedestal of a broken office chair. I think I got 40 channels,
all better than my best analog reception.
I took the antenna and TV outside, hoisted the antenna to a limb above
rooftop level, and used a cord to aim it toward each station the FCC
said was within 80 miles. I got the same 40 I got with the antenna
beside the TV in my dining room. My most reliable reception comes from
transmitters 80 miles away, while I can't receive from some transmitters
20 miles away.
It seems HDTV can work beautifully with weak signals because all that is
necessary is to count pulses. Multipath distortion can break the train
of pulses, causing trouble for HDTV. That's why I had trouble with the
amplified set-top antenna. Multipath distortion can come from
reflections in your house, outdoor obstacles like mountains, and even
reflections off the sky in some conditions. An impedance mismatch
between your antenna, cable, and TV can cause a similar problem.
I live about 30-40 miles from my stations and am located on the
backside of a hill between me and the stations. Analog signals were
adequate but not good but the digital signals are very good. With
analog I got 4 channels. With digital I get 14 channels. Note
however that's channels and not stations since most stations are
broadcasting 3 channels each. I only picked up 1 additional station
when they went to digital, but at least I didn't lose any like many
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