Re: Video Transmitter/Receiver question - radio license question
- From: hhc314@xxxxxxxxx
- Date: 28 May 2006 12:45:38 -0700
Jason, I was simply posting what my experience is, and not why spread
spectrum is now being widely uses for video transmissions.
I really am not very interested in where and how the video originates,
only in its transmission. The advantages of spread spectrum include
virtual elimination of multipath effects (which was a real problem in
the early 420-Mhz amateur TV days), and license free communication.
It's honestly a hard concept for a non-engineer to grasp, since it
depends on spectral dispersion of the signal in a pre-assigned
statistical manner, which makes for great communication at high
bandwiths, and is virtually undetectable unless you have receiving
equipment that has the same frequency shifting key and algorithm as the
transmitter. On top of this, a 5-mile link range is relatively easy to
achive, and inexpensively. This makes it the choice of most new highway
surveilance video systems and many remote control applications.
Harry C.
.
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