toutes bandes et Un adaptateur long-fil tout simple pour votre récepteur

Le site web de l’UIT est instructif. Vous y trouverez
beaucoup de choses intéressantes à savoir :
http://www.itu.int/fr/Pages/default.aspx
L’acronyme de février
UTC : On l’appelait "Greenwich" dans le temps.
Maintenant, c’est UTC. C’est le césium qui lui donne toute
sa précision.
VCO Il y en a au moins un dans quasiment tous les
transceivers modernes. Et vous en avez probablement
déjà construit sans le savoir.
Mais que signifient-ils ? Réponse à l’adresse de la revue
Les bulletins DX et contests
ARLP08 Propagation Bulletin
ZCZC AP08
QST de W1AW
Propagation Forecast Bulletin 8 ARLP008
From Tad Cook, K7RA
Seattle, WA February 22, 2013
To all radio amateurs
Average daily sunspot numbers over the past seven days,
February 14-20, rose modestly by 27 points to 78.3.
Average daily solar flux was up marginally, only 1.6
points to 105.6. Geomagnetic indices rose also, with the
planetary A index from 5.6 to 6.4, and the middle latitude
A index from 5.1 to 6. This is compared to the previous
seven days, February 7-13 reported in last week's
bulletin.
There was a more substantial rise in both solar flux and
sunspot numbers for a recent three days, at 104.7, 112.4
and 113.5 for solar flux, and 92, 117 and 106 for sunspot
numbers. But that turned around when the sunspot
number dropped from 106 to 75 on Thursday, February
21 and solar flux declined from 113.5 to 108.5.
The predicted solar flux is 105 on February 22-23, 100 on
February 24, 95 on February 25-26, 100, 105 and 110 on
February 27 through March 1, 100 on March 2-3, 95 on
March 4-14, 100 on March 15-16, 115 on March 17, and
120 on March 18-20, which represents a peak for the next
45 days.
The predicted planetary A index is 8 on February 22, 10
on February 23, 8 on February 24, 5 on February 25-28,
10 and 8 on March 1-2, 5 on March 3-10, 7 on March 11-
12, and 5 on March 13-27.
Over the next month we can look forward to improving
HF conditions as we progress toward the Spring Equinox,
which occurs on Wednesday, March 20 at 1102z.
Using a propagation prediction program such as
W6ELprop gives us a rough idea of what the seasonal
improvement might be. Running two instances of the
program simultaneously, once for February 21 and the
other on March 21, but with the same solar flux (I used
107) allows me to flip back and forth between the results.
I did one for Seattle to Japan, and the 15 meter opening
from 2200z to 0030z on February 21 shows up as a 2130-
0500z opening on March 21. Similarly, a 17 meter
opening from 2130-0230z on February 21 stretches to
2030-0500z on March 21.
OK1HH predicts the geomagnetic field as quiet to active
on February 22, active to disturbed on February 23,
mostly quiet February 24-25, quiet on February 26-28,
quiet to unsettled March 1, quiet to active March 2,
mostly quiet March 3, quiet to unsettled March 4, quiet
March 5-6, mostly quiet March 7-8, quiet March 9, and
quiet to active March 10.
Several news articles, such as
http://www.upi.com/Science_News/2013/02/20/NASA-
instrument-sees-giant-sunspot-forming/UPI-
80691361403797
and
http://www.science20.com/news_articles/giant_sun_spo
t_size_6_earths_grows_48_hours-104269 mentioned a
huge growing sunspot group 1678 that might spit out
solar flares. But this spot is way over on the western
horizon (yes, the right side is referred to as "west" on the
Sun) and about to slip away from view. It is not geoeffective,
which it would be if it appeared in the center of
the visible solar disc.
Jon Jones, N0JK of Lawrence, Kansas (where I was born!)
has long enjoyed working 6 meter E-skip and even DX
using very modest and even compromised antennas. Jon
reported on February 16: "Julian, XE2JS DL68 had a nice 6
meter Es opening to the Midwest Saturday evening
(February 17 UTC). I worked Julian while I was mobile on
highway 40 west of Lawrence, KS EM28 with 58 to 59
signals at 0135 UTC. My 6 meter mobile antenna is a 2
meter 5/8 mag. mount whip (quarter-wave on 6 meters).
Saw ZL1RS worked TI5/N5BEK earlier at 2254 UTC
February 16."
Yes, Jon feeds that 2 meter whip directly on 6 meters, no
change in loading or any modification. That distance
between him and XE2JS is a little less than 1,000 miles.
QSP N°29 Février 2013 51