Consistantly over the past 40 years I reaffirm on a daily basis that, at
least on 40M, as the sun lowers in the west I can hear European stations
about 45 minutes to an hour before they can hear me.
I have no explanation for it but suspect that the signal level is the same
on both ends but the background noise from the daylight side masks the
signal as it appears in Europe.
Tom K2TA
----- Original Message -----
From: "Kevin Rock" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, November 30, 2006 10:17 PM
Subject: Re: [Elecraft] One-Way Propagation?
Howdy Jeff,
If you get on 20 meters in the morning, while you are in the early
morning hours and the operator with whom you are working is in an area
later in the day, you will find some odd occurrences. Some days you hear
better than the other op and some days it is the reverse. The ionosphere
is not a perfectly spherical reflector. From empirical evidence I have
found it to be quite oddly shaped indeed. Think of the layer you're
bouncing your signals off as a boiling layer where the surface changes
direction rapidly. This describes rapid QSB. Other times you'll hear
very slow, but deep, QSB. At that point the reflecting layer is starting
to calm down a bit but there are still bumps in it. Under perfect
conditions the received and transmitted signal meet a perfectly smooth
reflective sheet which allows the two of you to communicate quite equally.
As far as being truly one way? Occasionally I hear ops extremely well
but they cannot hear me. I hope it is not that they are ignoring me but
simply cannot hear me. This is what I call one-way propagation.
Please accept this as a non-scientific, entirely empirical experiment of
my own accord on propagation characteristics.
Kevin. KD5ONS
On Thu, 30 Nov 2006 17:05:12 -0800, Jeff <[EMAIL PROTECTED]> wrote:
Kevin, KD5ONS, wrote:
"One way propagation is not unheard of..."
Is there really such a thing as one-way ionospheric propagation? My
intuition says no, but I don't have the physics knowledge to back it up.
On the other hand, sometimes it sure seems that stations who ought to be
able to hear my QRP signal cannot.
73 & 72,
Jeff
WB5GWB
Long Island, NY
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