WhatEver wrote:
: wrote:
: I recall reading about false lobes on the glideslope, and have seen it
: firsthand doing practice approaches in VMC. I thought it was due to antenna
: sidelobes, and thus the localizer might be subject to a similar phenomenon. I have
: yet to see anyone reference this, so is there a technical reason why they don't exist?
: One of the localizer transmitter frequencies have a different antenna pattern to
: interleave the sidelobes perhaps?
:
: -Cory
:

: If properly maintained they cancel out. However, it can be a
: major problem if the facility is not maintained correctly.

: The technical term is null

I've never heard of it called a null. I've only heard that referrered to
either a standing wave null, or a part of an antenna radiation pattern that has zero
radiation. Since the localizer relies on relative strength of two different
transmissions, it seems liek having overlapping sidelobes in their radiation patterns
would produce "false localizers"

-Cory

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************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
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