Hello Andy,
I am running different RX stations at different locations.
"DK7FC" is from the city, an active E field antenna, 38m above ground,
on the top of the institute in JN49IK00.
Grabber:
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_MF_Grabber.html
The second location is my garden, about 300m outside the city, in JN49IK24,
2.4 km distant, a solar powered remote station. There i'm running a
stereo receiver, or two identical receivers. They use different
antennas. One is a passive E field T-antenna, the other one is a loop
beaming to about 300/120 deg. The MF spectrum is sent via a stereo
vorbis stream and WLAN to a PC here in the institute, where i'm running
2 WSPR instances and 6 SpecLab instances to generate spectromgrams
beeing uploaded to
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_Grabber.html
Both WSPR instances working on the remote stream signals are running as
"DK7FC/P". My idea was to use the same call for these 2 different
antennas to reduce the number of spots beeing uploaded under my call.
Normally the WSPR database rejects an upload if it is already existing.
So there should be just one upload from DK7FC/P for each decode.
However sometimes it happens that both spots are uploaded. I don't know
why and i cannot decide to upload only the spot having the best SNR :-/
So i can see the difference between the city location and the garden
and the difference between loop and T ant. Often the Loop has less QRN
and signals from UK are better on the loop. For example LA3EQ often
does not appear on the loop but on the T antenna and sometimes the city
RX produces a better SNR as the gardens T ant (both E field /
omnidirectional). Sometimes i can see a difference in the QSB between
city and garden over that short distance.
It's a big playing field! :-)
Ah, then, there is a 3rd WSPR instance running just sometimes in
daytime, also as DK7FC/P. There i'm combining E+H with a certain
time/phase delay within SpecLab and feed it via VAC to WSPR. This forms
a cardioid directional antenna. I can receive DH5RAE and DJ0ABR in
daytime then, but only with this combined signals. There is an
improvement of about 8 dB on the signal!
73, Stefan
Am 01.11.2015 17:15, schrieb F6CNI - Andy - JN19QB:
Hello Stefan.
Just one question : On WSPR you just gives me 3 reports at the
same moment :
| 2015-11-01 16:02 |
F6CNI |
0.475638 |
-21 |
0 |
JN19qb |
0.02 |
DK7FC |
JN49ik |
389 |
82 |
| 2015-11-01 16:02 |
F6CNI |
0.475635 |
-26 |
0 |
JN19qb |
0.02 |
DH5RAE |
JN68qv |
730 |
88 |
| 2015-11-01 16:02 |
F6CNI |
0.475636 |
-24 |
0 |
JN19qb |
0.02 |
DG8RW |
JN69cv |
644 |
78 |
| 2015-11-01 16:02 |
F6CNI |
0.475636 |
-28 |
0 |
JN19qb |
0.02 |
DK7FC/P |
JN49ik |
389 |
82 |
| 2015-11-01 16:02 |
F6CNI |
0.475636 |
-20 |
0 |
JN19qb |
0.02 |
PI4THT |
JO32kf |
430 |
34 |
| 2015-11-01 16:02 |
F6CNI |
0.475638 |
-21 |
0 |
JN19qb |
0.02 |
DK7FC/P |
JN49ik |
389 |
82 |
- One from DK7FC with –21 dB
- Two from DK7FC/P with –28 and –21 dB.
I wonder what are the two differents reports coming from the
same call DK7FC/P ?
Best 73
Andy.
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