Re: Scanned Antennas book by Kraus


"Cecil Moore" <nospam@xxxxxxxxx> wrote in message
news:accZh.3018$HX7.605@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Dave (from the UK) wrote:
http://www.pmillett.com/Books/Kraus_antennas.pdf (7.9 MB)

This is great, Dave. Everyone who wants to see the standing
wave phase shift up and down a 1/2WL antenna can look at
page 239. Kraus shows a ~3 degree phase shift all up and
down the antenna. EZNEC shows the same thing. Now how did
Roy use this current to determine the phase shift through
a loading coil if it cannot be used to determine the phase
shift through a wire?
--
73, Cecil http://www.w5dxp.com

A real shame you cant copy and paste text from a pdf file.

Jimmie


.

Relevant Pages

  • Re: Current through coils
    ... there is a phase shift between applied voltage and maximum ... What happens in an antenna is voltage and current are out-of-phase by ... the coil would have a noticable ...
    (rec.radio.amateur.antenna)
  • Re: Current through coils
    ... missing antenna to bring the vertical to resonance. ... That is one of the laws of reflection ... Your above antenna loading coil ... presupposes no phase shift through an inductance. ...
    (rec.radio.amateur.antenna)
  • Re: Current through coils
    ... electrical length is EXACTLY where the big myth is at, ... undergoes approximately a 90 degree phase shift from ... of the antenna back to the feedpoint. ... coil is the only other thing in the whole system. ...
    (rec.radio.amateur.antenna)
  • Re: Current through coils
    ... The phase shift along the coil plus the phase shift along antenna ... Having the phase shift along the antenna and coil add to 90 degrees would require a 90 degree shift of current phase across the coil, regardless of the size of the coil or the antenna. ... Pluck a guitar string and watch it oscillate. ...
    (rec.radio.amateur.antenna)
  • Re: Current through coils
    ... It is NOT 90 degree resonant antenna with "80 degrees of ... The antenna, without a loading coil, is composed of three terms: resistance, self capacitance, and self inductance. ... In a shortened antenna the self capacitance dominates and the resultant phase shift is NOT zero. ... degrees long and the self inducance does not reduce the reactive phase shift to zero PHASE SHIFT MUST BE ADDED TO THE ANTENNA for resonance. ...
    (rec.radio.amateur.antenna)