[Lowfer] Observation...

[Larry Kayser]

Mike et all:

This phenomenon has been documented many times in the years before DSP 
became the tool of choice for seeing/hearing weak signals.  The best 
example is to put your headphones, at normal receive level, into a cut 
glass bowl and step back 10 feet or so.  You should be amazed at what you 
will hear that you did not hear with the headphones on your head.

A few years ago I worked a two yagi EME station with my one yagi EME 
station on 144 MHz by doing just that trick.  He could hear me, I was 
running a full KW, but I was unable to hear him, 150 Watts, but when I put 
the phones in the dish and sat back a bit, in a minute or two I found him 
and was able to copy call and reports etc.

The normal expectation is that the noise is distributed randomly but the 
signal can be positioned to reinforce (the mechanical reflector) and 
becomes audible to the listener.

Larry
VA3LK