On 17 Apr 2006 00:32:58 -0700, "Jzhao" wrote:

+Hi, James,
+
+thanks for your formula, but, one question is what is 299.8 for?
+by the way, something should be defined, i need the answer of this
+question based on the RF 50 Ohm and when it is working on high
+frequency (GHz).
+
+the insertion loss of the adaptor can be calculated approximative.
+with the intention that sometime we need to know the electrical length
+on test measurement technology.
*****

That is the distance that light travels in meters in one second in
free space.

james