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Re: LF: WSPR-15 test spectrogram in YV - Results

from [Stefan Schäfer] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: WSPR-15 test spectrogram in YV - Results
From: Stefan Schäfer <[email protected]>
Date: Fri, 25 Jan 2013 15:35:18 +0100
Cc: Joe Taylor <[email protected]>
In-reply-to: <[email protected]>
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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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