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Stefan
Actually it's a bit more ... the grid square
locater is six digits.
In order to convey ' WD2XNS FN31ls 30 ' in an
approximate 15 minute window (to be on par with WSPR-15) would require
a QRSS5 transmission.
Jay W1VD WD2XNS
WE2XGR/2
----- Original Message -----
Sent: Friday, January 25, 2013 9:40
AM
Subject: Re: LF: WSPR-15 test spectrogram
in YV - Results
PS: Isn't it amazing, the somewhat brighter blurry pixels
arround 10:15 in spectrogram 1, sent in less than 15 minutes, contain "WD2XNS
FN31 30(dBm)"!
Am 25.01.2013 15:35, schrieb Stefan Schäfer:
LF,
Here are two spectrograms showing traces of positive and negative
decodes in WSPR-15.
1: https://dl.dropbox.com/u/74746618/Files%20for%20exchange/WSPR15_25.JAN_10.20UTC.jpg
| Timestamp |
Call |
MHz |
SNR |
Drift |
Grid |
Pwr |
Reporter |
RGrid |
km |
az |
| 2013-01-25 10:15 |
WD2XNS |
0.137611 |
-38 |
0 |
FN31ls |
1 |
YV7MAE |
FK81bd |
3520 |
163 |
| 2013-01-25 09:15 |
WD2XNS |
0.137611 |
-36 |
0 |
FN31ls |
1 |
YV7MAE |
FK81bd |
3520 |
163 |
2. https://dl.dropbox.com/u/74746618/Files%20for%20exchange/WSPR15_25.JAN_05.50UTC.jpg
| 2013-01-25 05:45 |
WD2XNS |
0.137611 |
-34 |
0 |
FN31ls |
1 |
YV7MAE |
FK81bd |
3520 |
163 |
| 2013-01-25 05:15 |
WE2XEB |
0.137621 |
-35 |
0 |
FN12lq |
5 |
YV7MAE |
FK81bd |
3732 |
156 |
| 2013-01-25 05:15 |
WD2XNS |
0.137611 |
-31 |
0 |
FN31ls |
1 |
YV7MAE |
FK81bd |
3520 |
163 |
| 2013-01-25 04:45 |
WE2XEB |
0.137621 |
-37 |
0 |
FN12lq |
5 |
YV7MAE |
FK81bd |
3732 |
156 |
| 2013-01-25 04:45 |
WD2XNS |
0.137611 |
-33 |
0 |
FN31ls |
1 |
YV7MAE |
FK81bd |
3520 |
163 |
| 2013-01-25 04:15 |
WD2XNS |
0.137611 |
-36 |
0 |
FN31ls |
1 |
YV7MAE |
FK81bd |
3520 |
163 |
| 2013-01-25 04:15 |
WE2XEB |
0.137621 |
-36 |
0 |
FN12lq |
5 |
YV7MAE |
FK81bd |
3732 |
156 |
| 2013-01-25 03:45 |
WD2XNS |
0.137611 |
-37 |
0 |
FN31ls |
1 |
YV7MAE |
FK81bd |
3520 |
163 |
Somehow there
seems to be a time difference of 5 minutes in the spectrogram's time marker,
probably coming from the setup process.
The lowest decodes SNR, here
-38 dB, looks quite weak! I would have thought that it looks stronger. So
maybe WSPR-15 is a bit more sensitive than i expected. Comments
welcome.
73, Stefan/DK7FC
Am 24.01.2013 23:23, schrieb
Stefan Schäfer:
LF,
I've added a temporary grabber window to the YV
grabber, http://dl.dropbox.com/u/74746618/LF/YV7MAE_LF_Grabber.html
which displays the WSPR-15 LF range. The spectrogram uses the same scroll
rate and FFT settings as the typical QRSS-60 grabber windows.
The idea
is to compare the SNR indicated by WSPR-15 to the subjective visual SNR.
Of course the RF energy is spread out to a few FFT bins, so the brightness
or SNR must be lower compared to a QRSS trace. But anyway it will be
interesting and give some idea about the performance of WSPR-15 compared
to QRSS-60 or DFCW-90.
73, Stefan/DK7FC
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