On 07/24/2012 09:43 PM, Brian Barker wrote:
At 09:16 24/07/2012 -0400, Tim Lungstrom wrote:
Also the "lag time" for satellite can be up to 15 seconds from ground
station through a satellite to the ground station.
Oh dear: the speed of light must have decreased by a factor of 63
since I was at school! Has someone told the scientific community?
(The delay on the double journey to and from a geostationary satellite
is about a quarter of a second.)
Brian Barker
The lag time is due to the equipment, not the "travel time".
I have both standard and digital cable boxes in my place. If I have
both TVs on the same channel, the digital TV has a 2 second lag for
audio and video than the non-digital TV's box. That is do to the time
it takes to convert the TV channel to the digital system and then the
conversion back to the coax cable going into the digital TV's coax
input. Just in that simple case, there is a lag due to the equipment
involved.
As for the time lag I gave you, that is the lag time given in my course
in telecommunication and communication networking. The problem is the
equipment's lag time doing the processing of the signal to be
transmitted and then the process of converting the signal back to the
original format.
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