[AMRadio] Laws of Physics Repealed!


Scott McDonald ka9p at aol.com
Fri Oct 23 16:34:18 EDT 2015


I think there is more than a bit of irony involved here when you make those statements in a magazine that I think still refuses to accept gain numbers because of their unreliability....

73 Scott ka9p

Make something good happen!

> On Oct 23, 2015, at 3:23 PM, Donald Chester <k4kyv at charter.net> wrote:
> 
> 
> First there was the Gotham Vertical.  Then the infamous Max-Com automatic
> antenna matcher.  Now, Cushrcaft is in on the action.
> 
> "R9" vertical.  Low angle radiation gives incredible, easy, world-wide low
> band DX on 75/80m and 40m, plus it covers 30 through 6m with low VSWR on all
> bands, with broadband matching transformer; no antenna tuner needed. Low
> profile blends inconspicuously to keep your HOA happy.  31.5 ft tall.  Best
> of all, NO RADIALS NEEDED!!!
> 
> Only $639. Just plug in your plastic radio and talk, talk, talk!
> 
> See November, 2015 QST, page 2.
> 
> Amazing that hams (or maybe I should say HAMs) swallow that crapola.  31.5
> ft is only an eighth wavelength on 75/80m. The base impedance of a 1/8
> wavelength vertical is about 12 ohms. No matter how much gimmickry such as
> stubs, loading coils, toroidal transformers and porcupine spikes are added,
> that thing will basically be a dummy load unless it is used with a
> SUBSTANTAL radial ground system.  A couple of 8' ground rods won't cut it.
> 
> I had always considered Cushcraft, which has been in the antenna business
> for decades, a reputable outfit, but this makes me wonder.
> 
> 
> Don k4kyv
> 
> 
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