PS: So let's assume you can do QSOs down to -9 dB in 2500 Hz,
reasonable comfortable (i mean real QSOs, with some content except "5nn
JN49 tu", i.e. not just a test. Or an always repeating NDB call in slow
CW). Then you see that WSPR decodes about 20 dB lower. Good for DX
experiments and propagation studies and for radiating some RF when
beeing outside the shack...
73, Stefan
Am 25.09.2015 12:01, schrieb DK7FC:
Hello Fausto,
Good quastion! I've made a quick test and reduced my TX power so i can
receive me in my garden at -6 dB SNR. I then switched to CW and recorde
a wav file. So the background noise is real (not coming from a signal
generator), but it's daytime noise...
Listen:
https://dl.dropboxusercontent.com/u/19882028/MF/CW%20bei%20-6dB%20WSPR_AF.WAV
The first half is at -6 dB, the second at -16 dB (in 2500 Hz).
So, the first part is how John/W1TAG would have heared me last night
:-) It is no problem for a CW QSO. The seconds part is barely audible
but very hard to understand. You could say "i hear you but i cannot
read you"...
But the thing is that such good propagation is VERY (!!) rare! The
chance is very small that you can make a sked and get such a good
propagation just during the time you want to make a QSO. December or
January is the best time for attempts i think. But you will need a good
antenna and loads of power :-)
73, Stefan
Am 25.09.2015 11:00, schrieb Fausto Coletti:
Hi Stefan,
a wspr -6dB sgnal is audible ?
The question is this: with this
condition and if necessary a bit more power it is possible a cw qso?
73, Fausto IK4NMF
----- Original Message -----
Sent:
Friday, September 25, 2015 10:41 AM
Subject:
Re: LF: First MF TA since a longer time
Hi all,
Last night there were excellent condx on 630m on the TA path! G8HUH,
F5WK and DK7FC managed to be decoded in above 5000 km in WSPR.
I've got exceptional good SNR reports!:
| Timestamp |
Call |
MHz |
SNR |
Drift |
Grid |
Pwr |
Reporter |
RGrid |
km |
az |
| 2015-09-25 04:52 |
DK7FC |
0.475683 |
-23 |
0 |
JN49ik |
1 |
WG2XKA |
FN33lq |
5970 |
297 |
| 2015-09-25 04:32 |
DK7FC |
0.475683 |
-16 |
0 |
JN49ik |
1 |
WD2XSH/17 |
FN42pb |
5927 |
294 |
| 2015-09-25 04:32 |
DK7FC |
0.475684 |
-6 |
0 |
JN49ik |
1 |
W1TAG/1 |
FN43sv |
5789 |
296 |
| 2015-09-25 00:32 |
DK7FC |
0.475683 |
-5 |
0 |
JN49ik |
1 |
TF3HZ |
HP94ad |
2440 |
323 |
-6 dB by W1TAG/1 means that many weaker stations could have made the
path as well, in that time slot!
73, Stefan
Nessun virus nel
messaggio.
Controllato da AVG - www.avg.com
Versione: 2015.0.6140 / Database dei virus: 4419/10695 - Data di
rilascio: 25/09/2015
|
|
