locked Re: Clock Sync #Timesync


Hi Jim,

"If one assumes the velocity factor of a USB cable is about 80%, that means about 250 microseconds of propagation delay per meter."

Let's see...  the speed of light is 3 x 10^8 m/s, so the delay in a 1 meter cable is 1.0/(0.8x3x10^8) = 4.2 x 10^-9.  I make it around 4 nanoseconds, not 250 microseconds.  But you're certainly right, the cable delay is well under a millisecond.  :-)

  -- 73, Joe, K1JT

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