[600MRG] Antenna help sought

[Roger Graves]

John,

Is it a straight, single wire, dipole (not a folded dipole)?
Is there a balun at the antenna/feedline junction?

If the answers to both above are “NO”, then it seems that your feedpoint should be capacitive at 475 kHz and require a loading coil to resonate,
IDK why your analyzer would indicate otherwise. 
Anyway, why not just add some inductance and see whether the resonant point moves down, as you expected, or up (as the analyzer is suggesting). That should be easy enough to do.

Good Luck!

Roger

On Oct 30, 2017, at 11:14 AM, John Harper <johnae5x at gmail.com> wrote:

> I wonder if any antenna gurus here could take a look at my results of
> feeding my 80m dipole and 90 feet of vertical ladder line leading up to it
> as a vertical T on 630 meters.
> 
> I was all set to wind a coil, achieve resonance and finally be on the air
> but it appears I'll need a capacitor. Not sure what type is called for...?
> 
> Here is a description of the antenna and the measured results. If anyone
> can suggest what I need to make it happy on 630m, I'm all ears:
> 
> https://ae5x.blogspot.com/2017/10/problems-converting-80m-dipole-to-630m.html
> 
> Tnx and 73,
> -- 
> 
> John AE5X
> https://ae5x.blogspot.com
> _______________________________________________
> 600MRG mailing list
> 600MRG at w7ekb.com
> http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com