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Hello Stefan,
My idea is to use the PC as VLF RX under
10 kHz. I think that the level noise increased in my urban environment because I
don´t copy the Alpha´s transmissions now, however I could copy
them some years ago, when I worked on 137 kHz. I´ll try to
improve my provisional antenna system, perhaps with a loop I can reject some of
the "made man noise" :-) I´ll tell you about the experiences.
73 de José, EA1PX
----- Original Message -----
Sent: Tuesday, June 14, 2011 12:18
PM
Subject: LF: VLF in Spain
Hello José,
OK. Do you already have a receiver for VLF?
If so, which one? The PC's soundcard? Or do you just guess that you have
strong QRM?
Many stations are in the city, like 4X1RF, SQ5BPF and me.
Anyway there is good reception, 4X1RF even at above 2500 km! Others are in the
countryside and have never really got good reception, so mostly its an EMC
issue.
Thus i would suggest to built a suitable antenna and run a suitable
software and monitor the total spectrum of your soundcard input which is
mostly 0...24 kHz, often called "wideband". You can see these windows running
on many grabbers such as
http://www.mydarc.de/df6nm/vlf/vlfgrabber.htm
http://www.ok2bvg.cz/vlfgrabber/
http://qsl.net/4x1rf/yo/vlfgrabber.htm
http://simnet.is/halldorgudmunds/TF3HZ_VLFgrabber/index.html
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html
and many others.
Then, you'll get immediately an impression of the actual
situation and see effects like mains hum, sferics and the Alphas system and
some MSKs.
Seeing the Alphas and the sferics (i.e. the gap arround 8...11
UTC) is a first good indicator for sensitivity!
Actually all you need
is a few Euros to build that RX antenna which can be a loop or a E field
antenna. Mosty receptions were done with the E field antennas which have some
advantages due to their low weight and volume. But loop antennas have shown
very good results as well, mostly in quiet locations (like Paul Nicholson,
F4DTL, M0BMU...).
73, Stefan/DK7FC
Am 14.06.2011 00:08,
schrieb Jose Manuel:
Stefan,
I´ll try to do some experience on sub 9kHz
reception; I´ll try to find a quiet location on holiday, because I live in a
very noisy urban environment.
Regarding 137 kHz I had some 2-way QSO´s in the
past with your country, with Wolf, Markus and others, but currently my LF
antenna is down and I need to repair the SLM as well.
73 de José, EA1PX
-----
Original Message -----
Sent:
Monday, June 13, 2011 11:42 PM
Subject:
Re: LF: ZEVS tonight.jpg
Josè,
You can get many informations about the
Dreamers Band (<9) at G3XBMs sub 9 kHz website: https://sites.google.com/site/sub9khz/
Here
you find record lists and advice for antennas. And you can get every
information needed HERE! :-)
73, Stefan/DK7FC
Am 13.06.2011
23:30, schrieb Jose Manuel:
Mal and all,
You know that reception on 9 kHz is much
more difficult than on 137 kHz.
I never tried to receive below 10 kHz,
perhaps in a couple of weeks, when I´m on holiday ;-)
73, José, EA1PX
-----
Original Message -----
Sent:
Monday, June 13, 2011 7:53 PM
Subject:
Re: LF: ZEVS tonight.jpg
Jose
In the past you were able to copy me on
CW no problem, with XBAND qso
de mal/g3kev
-----
Original Message -----
Sent:
Monday, June 13, 2011 4:14 PM
Subject:
Re: LF: ZEVS tonight.jpg
Hi Stefan and all,
I´m in the NW of Spain, locator IN53ti,
but with a very long path with you ;-)
73 de José, EA1PX
-----
Original Message -----
Sent:
Sunday, June 12, 2011 11:57 PM
Subject:
Re: LF: ZEVS tonight.jpg
Eddie,
Where in France will you be? http://no.nonsense.ee/qthmap/
:-)
Will you be RX QRV on LF/VLF? If you are in the south, this
would be an interesting region. Unfortunately there is nothing yet
from Spain on VLF...
QRN will be high i assume so maybe it
wouldn't be easy. Anyway iz would be worth a try. BTW i just
checked for wind and the next weekend looks promising so far. If
it will hold on, i'll try a kite VLF experiment but still much can
change until then...
73, Stefan/DK7FC
Am
12.06.2011 23:27, schrieb qrss:
Hello Nicolas
Yes almost 100% transmissions
at 0800 and 1700UTC.
Each data element is 4min and
there are 6 of those plus 'start' and 'space' makes 8 total, 32
minutes then the final long carrier 'stop' is 1
Hour.
Good luck with the antenna, yes urban noise is the
big problem. Soon I will come to France to try some really quiet
places, I look forward to that.
73 Eddie G3ZJO
On
12/06/2011 21:34, [email protected] wrote:
Henny, Eddy beautifull captures.
It's every day at the same hour ? 0800 and 1700 UTC
?
How long the ZVES transmissions ?
I built an new VLF antenna and I'll start soon
receptions.I would be in campaign to reduce urban
noise.
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