Topband: Efficiently Matching Low-Impedance Antennas to 50ohms

[Barry Gross]

On 9/23/05, Ulrich Weiss <dj2ya at t-online.de> wrote:
>
> hello Ron,
>
> From: "Herb Schoenbohm" <herbs at vitelcom.net>
> > You can get close to what you want (about 25 ohms) by tying two pieces
> of
> > 50 ohm coax equal half wave lengths (in coax factoring the velocity
> factor)
> > in parallel hooked shield to shield and center conductor to center
> > conductor...in series with the 50 ohm coax feed and the antenna. This
> > should bring you in the ballpark and totally avoid any tuner losses.
>
> Herb's suggestion will reduce your SWR to 1.6... using 75 ohm line would
> yield 1.4 and if you can get hold of 60 ohm line you'd be pretty close to
> a
> perfect match...
> after reading Maxwell's, Another Look at Reflections, I ask myself (and
> the
> reflector) if it's really worthwile to improve the match at the feedpoint
> of
> the vertical...
> regards


Shouldn't the coax lengths be electrical quarter wavelength rather than half
wavelength?

73,
Barry N1EU