Topband: VERTICAL SPACING

[Rick Karlquist]

Brian Machesney wrote:
> N6RK wrote:
>
>>> You don't need a 1/4 wavelength = 134 ft.  You actually get more gain
>>> with 1/8 wavelength.  Less is more.  Anything in between is OK too.
>
> So true, but be sure to measure the self- and mutual-driving-point
> impedances to calculate network values that will produce equal currents at
> the phase angles you require. In my experience, not doing so will produce
> disappointing results.
>
> I have successfully use the procedure outlined in Chapter 11, section
> 3.2.2
> of ON4UN's "Low Band DXing" to do this several times.
>
> --
> 73 -- Brian -- K1LI

Rather than going to that trouble, simply tune for maximum
front to back ratio.  If you get a 20+ dB null off the back,
you can be sure the currents are equal and at the correct angle.

Rick N6RK