[time-nuts] Rain, Water, etc

[Dr. David Kirkby]

Tom Clark, K3IO (ex W3IWI) wrote:

> David,
> 
> Maybe we can figure this out. First, the refractive
> index of water is about 1.3. So I think this means
> the propagation speed of radio waves in water is
> down to about 0.75 c, right?

1.3 is about right in the optical region, but I believe the effective 
permittivity at rf is more like 80.


Remember too, n=sqrt (Er * Ur)

So at RF, the index is >> 1.3

You would need to double check this. (I'm sure google would show up some 
data).