Alan,
Unfortunately, I was discussing two diverse things, which may or may not
have explanation in Aurora.
First, what I saw on TIL's 137 signal has to have been some kind of long
delay echo. The reason is that the phase of his MODULATION was visibly near
80 degrees out of phase with the second signal. It shifted toward the 180
degree mark and as it moved it had period of null. The resulting screen
display was like a classroom description of multipath QSB. The signal rose
in value and then slowly decreased in value.
I do not know the period of Scott's sinewave modulator, but I assume that it
is something like 60 or 120 seconds. Half of even 60 is 30 seconds, and
there is nothing in the small bit of radio physics familiar to me that can
explain 30 seconds of time delay.
I have only seen this once, and only on Scott's 137 kHz. LF signal. After
this one event, I began capturing everything I observe and erasing what I do
not feel I will use.... Even this habit is changing, as some of the things
erased so wantonly have been found to have been of value later to others.
Second, the DI2AG QSB or fading... I have been a very active HF operator.
When Aurora rears her lovely head, I usually go out and admire her beauty.
She wears many different gowns, but always wants my undivided attention, and
so shuts off my radio in the circuit between my antenna and those of the
people with whom I wished to speak.
When the radio goes dead, I watch Aurora wave slowly and pulse. There will
be many others in the north who are familiar with these movements. I was
asking if it is possible that the DI2AG fading could have been multipath,
caused by one signal coming via the Auroral path, and if so, it might have
been subject to a moving refractor, changing the length of the Auroral path
relative to the normal signal path.
Imagine one path being a sky wave on a direct path and the second path being
a wave to the nearest point of the Aurora, which is not a stationary target
but one which undulates over many miles. It just happens that the
conditions were right for Aurora when the fading occurred. Again, it is bad
science to assume that Aurora has anything to do with it... It is just an
observation, and a question.
J.
|
