Hi Alan,
My observation is that the sky wave attenuation at daytime in summer is
in the order of 40 dB over that distance. So i think it is groundwave
exclusively. Also i can't see QSB over that distances at daytime (maybe
1 dB).
Water nearly seems to act as an amplifier at 630m :-) Could that be a
reason for the choice of the ex marine frequency? ;-)
73, Stefan
Am 20.05.2014 21:02, schrieb Alan Melia:
Hi Stefan interesting...... at that
distance could it just be different goundwave v skywave phase at the
different receivers. You really need more thn two paths to pin that one
:-))
Alan
-----
Original Message -----
Sent:
Tuesday, May 20, 2014 12:41 PM
Subject:
LF: MF propagation
Hi MF,
| Timestamp |
Call |
MHz |
SNR |
Drift |
Grid |
Pwr |
Reporter |
RGrid |
km |
az |
| 2014-05-20 10:10 |
PA0A |
0.475698 |
+4 |
0 |
JO33de |
1 |
G3XDV |
IO91vt |
466 |
253 |
| 2014-05-20 10:10 |
PA0A |
0.475702 |
-25 |
0 |
JO33de |
1 |
DK7FC |
JN49ik |
449 |
157 |
That shows the difference of MF propagation over sea water and over
land at daytime! (maybe 3 to 6 dB more background noise here?).
73, Stefan
|
|
