[TowerTalk] The hunt for a feedline fault - update

[jimlux]

On 11/8/19 4:00 PM, David Gilbert wrote:
> 
> 
> By the way, I was wrong when I said earlier that TLW was telling me I 
> had a dead short.  The graph only made it look like that, and a more 
> careful look at the axis dimensions said that the dips for each 
> frequency were always about 28 ohms resistive at the low power of my 
> analyzer ... which makes more sense than a short for a fault caused by a 
> high power RF arc over.  I find that even more impressive (the data, not 
> my error), since it means that the location of even non-absolute 
> anomalies (neither open nor short) could potentially be found by this 
> method.

It's essentially like doing the FFT of a frequency sweep to do time 
domain reflectometry.. And it's very, very sensitive.  The one thing 
that will cause troubles (with either approach sweeps or TDR) is some 
sort of repetitive partial fault - because of ambiguities.