Re: RSGB RadCom December 2007 Issue

Cecil, W5DXP wrote:
"I suapect they (reflections) are originating at the feedpoint, i.e. the
forward wave travels all the way around the loop and is reflected from
the impedance discontinuity at the feedpoint."

That would be a reflection from a virtual impedance bump wouldn`t it?

The wave travels both wires of a feedline simultaneously, and enters
both ends of the loop at the same time. The collision is at the midpoint
of the loop opposite the feedpoint.

Arnold B. Bailey says on page 399 of "TV and Other Receiving Antennas":
"Now, in the loop, the far-end reflection point is a short circuit, and
hence, the current is high at this far end."

Best regards, Richard Harrison, KB5WZI

.

Relevant Pages

  • Re: RSGB RadCom December 2007 Issue
    ... "I suapect they are originating at the feedpoint, ... forward wave travels all the way around the loop and is reflected from ... That would be a reflection from a virtual impedance bump wouldn`t it? ...
    (rec.radio.amateur.antenna)
  • Re: iterate through methods
    ... >> I would like to iterate through several methods and I cannot seem to find ... > I'm sure a loop of less methods would have made your problem clear:) ... but it can be done using reflection. ... an array of function pointers would be ...
    (comp.lang.java.programmer)
  • Re: Information about my experience with Magnetic Loop antennas on my homepage
    ... It simply travel  trough the loop and looks like the "reflected with the ... because there is no impedance discontinuity at that point. ... cause a reflection. ...
    (rec.radio.amateur.antenna)
  • Re: Again on ADSL line
    ... :loop is large enough such that you can't see a "sharp" reflection. ... :to deduce its length with a TDR. ... Even the local fault techs can do line tests from their laptops. ...
    (sci.electronics.design)
  • Re: Spherical radiation pattern
    ... the reflection has added another 180 degrees for a total of 360 degrees ... or back in phase with the forward current at the feedpoint. ... At the open circuited ends of a resonant antenna there is almost double ... dorward and reflected currents at the open circuit. ...
    (rec.radio.amateur.antenna)