Well said Grant.
Glenn, VA7UO
On Thu, Sep 12, 2019 at 8:18 AM Grant Saviers <grants2@pacbell.net> wrote:
>
>
> On 9/11/2019 9:45 PM, David Gilbert wrote:
> >
> > I think most of that is fairly misguided advice when it comes to
> antennas.
> >
> >
> I would agree and the rest well said.
>
> The NEC programs continually amaze me how well they predict behavior and
> performance. There is very little magic left beyond Maxwell. Creative
> ideas? Great - give them a spin in the NEC washing machine. I must have
> 200 bad ones thankfully never built. Plus, EZNEC has some nifty
> generation routines. Want a tapered wound spiral vertical? - easy. A
> few hours of modeling and then we built one - resonance F and R very
> close, measured A/B gain in the predicted minus few db ballpark. Was
> that model perfect? - of course not, some significant variables were not
> possible to model, but the prediction was very close to reality. As
> W8JI pointed out, without controlled A/B performance testing, there are
> just too many variables to declare any sort of victory. That pretty
> much wipes out experimental optimization unless you have a real antenna
> range.
>
> I find it depressing to see hams put up at great effort even simple wire
> antennas that just don't work very well. No need to debate which yagi is
> better. Now when asked to help build a DOG of an antenna, I pass.
> Especially if I was asked and counseled against it. The folklore that
> causes folks to build (and buy) them has amazing staying power.
>
> Junk antennas are likely one reason folks get frustrated and quit the
> hobby. So, I think we have a self interest to encourage building (or
> buying) good ones.
>
> Grant KZ1W
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