[time-nuts] Cable length calibration
Dr. David Kirkby (Kirkby Microwave Ltd)
drkirkby at kirkbymicrowave.co.uk
Thu Jun 30 17:03:57 EDT 2016
On 30 June 2016 at 09:19, Scott McGrath <scmcgrath at gmail.com> wrote:
> If the nominal velocity of propagation is known and length is known delay
> is easily determined mathematically
>
Except that coax does not have a uniform impedance or velocity factor. Both
will vary as a function of position and frequency. How relevant this is
depends on the accuracy you require, but since it is time-nuts, it is
reasonable to assume that such a simplistic method is not of the standard
expected on time-nuts.
Dave
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