Dynamic multipath interference, in which the delay and magnitude of reflections are rapidly changing, is particularly problematic for digital reception. While this just produces moving and changing ghost images for analog TV, it can render a digital signal impossible to decode. The 8VSB-based standards in use in North American ATSC broadcasts are particularly vulnerable to problems from dynamic multipath; this has the potential to severely limit mobile or portable use of digital television receivers. Solving the problem might require that different standards be adopted for mobile use.
Chuck ----- Original Message ----- From: "wd8chl" <[email protected]> To: <[email protected]> Sent: Monday, February 23, 2009 9:10 AM Subject: Re: [Repeater-Builder] Somewhat OT - How to make HDTV *really* work > JOHN MACKEY wrote: >> If the digital is on a very different frequency, then the frequency >> change is a reason why digital reception may be problematic. For >> example, if you are using a VHF antenna to try to receive >> a UHF digital signal, that will be problematic. > > I should be able to use any normal TV antenna. If it works on analog Ch > 7, for instance, it should work on digital ch 7. Period. If it doesn't, > there is something inherently wrong with the medium. > Again, RF is RF. The antenna doesn't care how it's modulated. > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
