Hi Jay, LF,
Am 28.09.2013 03:06, schrieb [email protected]:
Stefan
Memory fuzzy here ... not sure if I've seen a -40 snr on your signal in
the past. Do you recall?
2013-09-28 00:30 DK7FC 0.137610 -40 0 JN49ik 1 W1VD FN31ls
6099 295
Jay W1VD WD2XNS WE2XGR/2 WG2XSR/2
Yes i do. When you search the database for my call, last 2 weeks and
sorted by SNR you will see that -40 is rare. But even -41 is possible!
See:
| Timestamp |
Call |
MHz |
SNR |
Drift |
Grid |
Pwr |
Reporter |
RGrid |
km |
az |
| 2013-09-25 00:00 |
DK7FC |
0.137610 |
-41 |
0 |
JN49ik |
1 |
RW3ADB |
KO85ro |
2045 |
59 |
| 2013-09-26 21:00 |
DK7FC |
0.137610 |
-41 |
0 |
JN49ik |
1 |
RW3ADB |
KO85ro |
2045 |
59 |
| 2013-09-23 17:00 |
DK7FC |
0.137610 |
-40 |
0 |
JN49ik |
1 |
SV8RV |
KM07ks |
1621 |
139 |
| 2013-09-25 22:00 |
DK7FC |
0.137610 |
-40 |
0 |
JN49ik |
1 |
4X1RF |
KM72ls |
2850 |
121 |
| 2013-09-21 18:00 |
DK7FC |
0.137610 |
-40 |
0 |
JN49ik |
1 |
R3LW |
KO54mq |
1626 |
60 |
| 2013-09-18 19:00 |
DK7FC |
0.137610 |
-40 |
0 |
JN49ik |
1 |
RW3ADB |
KO85ro |
2045 |
59 |
| 2013-09-23 06:30 |
DK7FC |
0.137610 |
-40 |
0 |
JN49ik |
1 |
UW8SM |
KN28iv |
1163 |
87 |
| 2013-09-28 00:30 |
DK7FC |
0.137610 |
-40 |
0 |
JN49ik |
1 |
W1VD |
FN31ls |
6099 |
295 |
RW3ADB usually has rather poor RX results (often 10 dB lower SNR than
other RX stns close to him). That supports my thought that the decode
level appears even lower if there is QRM in the passband.
One could make a test: Use a white noise generator with a high level
and a notch at 136.610 Hz (my TX QRG), maybe 10 Hz notch BW. My signal
must be close to the decode limit. The rest of the 200 Hz wide passband
of WSPR should be covered with noise, maybe 20 dB above my signal.
Theorectically there should be a decode but the SNR must be terrible,
maybe you can get -42 dB SNR. That would be a new record, hi :-)
73, Stefan/DK7FC
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