Reg Edwards wrote:
Is it phase delay or time delay along the coil which is dependent on
frequency?

Seems to be both. John P. has already done the math in
another posting. Here's what he said:

John P. said:
Here is that list repeated in units of time, instead of degrees:

MHz ns delay
5.5 7.1
5.89 7.4
6 7.5
7 8.5
8 10.2
9 14.2
10 24.7
11 35.7
12 37.7
13 36.8
13.7 37.3
--
73, Cecil http://www.qsl.net/w5dxp