> MM> Out of idle curiosity, why the extra 5%?
> I could be wrong on this (correct if so - Roy), but I believe
> the added 5% changes the feedpoint impedance to more closely
> match the feedline, just as the drooping of radials at a 45
> deg angle changes it as well... I don't remember (from the
> tech-ref) which way it changes, but know that it does :) I
> wouldn't be surprised if the added length on the radials
> changes the arrays' angle of radiation, too...
Not too sure about that, however I -do- know that dropping the radials at a
40 deg angle effectivly creates a center-fed half-wave vertical antenna.
By dropping the radials down to such an angle, not only draws the feedpoint
impedance to nearer 50ohms, it does, in fact, as you stated, change the angle
of radiation. More of a 'blanket' in the area affected by the radiated field
of the antenna.
73 = Best Regards
-Jeff KA5THB
ka5thb@bigfoot.com
--- FMail 1.02
---------------
* Origin: Electronic Avenue BBS 210-533-5668 San Antonio, TX (1:387/510)
|