At what speed does mobile dtv reception become a problem?

O-O · 08-23-2009, 10:13 AM

For ATSC-M/H reception, at what speeds does reception of signals become impossible? Over 100MPH? Just curious.

CptlA · 08-24-2009, 06:21 PM

Quote:

Originally Posted by O-O

For ATSC-M/H reception, at what speeds does reception of signals become impossible? Over 100MPH? Just curious.

The speed of light.

jsmar · 09-01-2009, 11:49 AM

Quote:

Originally Posted by O-O

For ATSC-M/H reception, at what speeds does reception of signals become impossible? Over 100MPH? Just curious.

In looking up details for the Kenwood unit mentioned in another post, I noticed it mentioned reception up to 130 MPH. I don't know if that is an advanced capability that you get for your $500, or if all ATSC M/H receivers will be capable of reception at any speed you are likely to drive.

I wonder if the DVB-H standard is capable of higher speeds for those driving on the Autobahn!

Aaron62 · 09-01-2009, 12:14 PM

Quote:

Originally Posted by jsmar

In looking up details for the Kenwood unit mentioned in another post, I noticed it mentioned reception up to 130 MPH. I don't know if that is an advanced capability that you get for your $500, or if all ATSC M/H receivers will be capable of reception at any speed you are likely to drive.

I wonder if the DVB-H standard is capable of higher speeds for those driving on the Autobahn!

Up to speeds 155 MPH would be nice, actually if I'm not mistaken, all German made cars have a governed speed of 155MPH. Then again, who the heck would want to watch TV at speeds 100+ MPH?

jsmar · 09-01-2009, 12:53 PM

Quote:

Originally Posted by Aaron62

Up to speeds 155 MPH would be nice, actually if I'm not mistaken, all German made cars have a governed speed of 155MPH. Then again, who the heck would want to watch TV at speeds 100+ MPH?

Perhaps the passengers who are trying to forget that they are in a car traveling at that speed?

HTNut · 09-01-2009, 01:16 PM

Quote:

Originally Posted by Aaron62

Then again, who the heck would want to watch TV at speeds 100+ MPH?

My wife would be too busy clubbing me over the head.

cjswann · 09-01-2009, 08:32 PM

Had a dvd/vhs system with an analog tuner that all came with the purchase of the car. I got used to watching the news on the way to work and watching the start of football games after leaving church on Sundays. Anyway, the conversion happened and I got a new radio/monitor system plus a DTV tuner. I though all was well with the world until I pulled out of the installer's parking lot, lost the signal, got it back at the light, lost it again when I starting moving, either that or the tiling thing going on.

What can I do??????

Piggie · 09-02-2009, 01:10 PM

Quote:

Originally Posted by CptlA

The speed of light.

"186,000 miles per second is not only a good idea, it's the law", Albert Einstein.

Piggie · 09-02-2009, 02:43 PM

Quote:

Originally Posted by O-O

For ATSC-M/H reception, at what speeds does reception of signals become impossible? Over 100MPH? Just curious.

I am not sure at what speed this would occur, but it could be calculated. The higher the channel number the slower this speed would occur due to shorter wavelengths.

But I am not talking about loosing the signal, but actually receiving it.

At some point you are passing through the peaks and nulls so fast with enough memory to interpolate signal loss in the device, it would have an easier time averaging out the data and drop out less!

From my experience using my ears and brain to interpolate audio data received on 146MHz, about 60 mph, one is driving so fast enough through the peaks and valleys of the signal the multipath flutter on FM audio all but goes away.

So it's possible that at 100 mph your reception on ATSC (not M/H) might be better than at 20 mph.

As far as ATSC-M/H goes, I don't think there is such a thing as driving too fast. The entire point of it was redundant data streams for error correction.