[Tech-Assist] Marti STL funny readingsHere's a head scratcher.

[Cowboy]

On Tuesday 26 July 2011 07:44:47 pm Alan Alsobrook wrote:

> The real question is, how does it look on the receive end?
> if it looks good there, I wouldn't worry about it. The Z of the antenna 
> at 950, can be a bit dynamic. If it's working good and the transmitter 
> is happy, it's doing it's job.

 And I would agree.

> I would imagine that if more people measured at the antenna they would 
> see similar anomalies, but unless there's a problem we normally don't go 
> sticking meters at the upper end of the line unless there's a problem.

 And when we do, we are *very* careful with line lengths, connectors,
 type of meter, ( internal dimensions ) and such. An inch doesn't sound like
 much, but at STL frequencies it can be everything.

 The "best" way to do this, is with a TDR sweep. 
 There's reason they calibrate at both ends of the line when doing
 a proper sweep, with no jumpers at all, and do it from the bottom.


-- 
Cowboy