[BC] Directional Antenna Proofs <SoM1GkFk0>

[Cowboy]

On Thursday 21 June 2012 11:41:22 pm James B. Potter wrote:
> There is one minor clue, but I don't know what to do with it.  Tower #4 is
> our reference tower, and the only one that is top-loaded using the guy
> wires. 

 Should be irrelevant.

> For some reason, we can't get an impedance reading with our in-line 
> bridge; but we can on the other 4 towers.  But the base current, current
> ratio and phase are what they are spec'd to be.

 Hmm.....
 What you're saying ( this is a question ) is that the other 4 are what
 they are spec'd to be ??
 The reference by definition has a phase zero ratio one, no matter what.

> If that tower really was 
> out of the range of the impedance bridge, I would expect real trouble with
> the current and phasor, but not the case. 

 Then pre-set the bridge to what the base Z was in the last full proof,
 and expect to find the reading +/- 10 ohms ( probably a lot less )
 for both R and X, depending on monitor parameters of the other
 sticks, particularly high current ( not necessarily high power ) towers.

 The reference is usually ( but not always ) fairly high powered 
 relative to the array, so also switch out the amp ( if any ) and
 use DIRect for the detector, not TUNE.
 Might be hard to see, but it'll be true.

-- 
Cowboy