A couple of days ago, Markus posted Eb/N0 numbers for WSPR and OPERA, for comparison to the BPSK VLF tests (see below). Some may be interested in a table with Eb/N0 values for some more amateur modes
Not in any, really. I'm not aware of any (published) experiments having been done to establish decoding thresholds for it, which I could use to put it in the table. Compared to regular CW transmitted
Indeed, I was surprised to see the number for the three CW cases match so nicely. However, precisely in the CW case, the results should be taken with grains of salt worth several dB. The aural CW res
Found it, at http://www.wireless.org.uk/signoise.htm . No DFCW there though. The QRSS line in my table is based on ON7YD's tests, http://on7yd.strobbe.eu/QRSS/ I'd be interested, but can't find somet
During the eclipse (and in fact already a few days in advance), I've been logging signal strengths over the entire 0 to 29 MHz spectrum using my WebSDR system in Enschede, The Netherlands. As was to
Interesting! Of course, I had seen the QRM, but somehow didn't notice its frequency also had an eclipse-dip. That seems unlikely since the QRM wasn't there today, even though today was sunny here. Co
Hello Roelof and others, At my location, the 189 kHz signals also had a dip before the peak, like you describe. The dip and peak are less pronounced (i.e., fewer dBs) here than the numbers you mentio
A couple of months ago, there was some discussion on this list about the cheap Tesco 113B kitchen radio performing very well on longwave (see below). This made me curious, particularly since it looke
Well... I'm the operator of the Twente WebSDR, but there is no WSPR decoder running here, although I do hope to add that in the future. So currently the WSPR reports from our receiver must be generat
Hello all, I've added an experimental 137 kHz "grabber" to the Twente WebSDR receiver. It can be found at http://websdr.ewi.utwente.nl:8901/grabber.html The receiver is located in JO32KF, in Enschede
Hello Markus et al., Ah, I see ;-) Actually, the FPGA is a bit bored; it could serve even more and wider bands, but our current server PC can't handle that, unless I reduce the maximum number of list
Hello all, I can't help you with Scandinavia, but last week, I did add the VLF band to the WebSDR at the University of Twente in the Netherlands. The antenna is the same 80 m long wire that we use al
Hello VLF'ers, I have one running at our WebSDR site: http://websdr.ewi.utwente.nl:8901/ for live reception, and http://websdr.ewi.utwente.nl:8901/grabber.html for 5 grabbers (I've just added 5170 an
Hello all, Very nice that Stefan's VLF signals were received in lots of places! Unfortunately, his signals were not seen on the grabber that I installed at the University of Twente's WebSDR (in the N
Since 16:52 UTC this evening :) And also a couple of times in previous days. A half-as-wide system has been active occasionally since January. However, this is _not_ the old http://websdr.ewi.utwente
The almost freeze option only slows the waterfall down, but does not do extra integration as you'd presumably wish. What does that box do? (I'm not very familiar with spec-lab.) About 130 kbit/s or s
Hello Alberto, I'm pretty sure it is selective. We have one (including an additional CRT display module) at our university's radio club, and I remember using it (many years ago) as a spectrum analyze
Ah... seems it's time for me to announce that since a couple of weeks, our WebSDR is also running a WSPR decoder. Or actually 13 of them, continuously monitoring all WSPR frequencies between 0 and 29
If one modulates a carrier simultaneously in phase and amplitude (with the same audio signal), sidebands of the AM and the PM can (partially) cancel each other on one side of the carrier, while reinf
No, I think the shape is mostly irrelevant, as long as the size is small compared to the wavelength. What is relevant is the average height of the probe, for some suitable definition of "average". Th
