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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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