I am looking at upgrading the computer I dedicate to my radio work and I am looking for some advice. It is an old office Dell running at 2.66GHz with 1Gb RAM. There are two reasons: Firstly, I want t
I was involved in the naming of "QRSS". It is simply QRS (slow CW) but the extra 'S' indicates "very", using the same syntax as "QRPP" meaning "very QRP". It is hard to imagine now what a breakthroug
As noted by Andy, G4JNT, recently, this week is the 20th anniversary of the very first Slow CW (now called QRSS) transmission which was between G3PLX and Andy on the old 73kHz band. To commemorate th
An interesting weekend celebrating 20 years of QRSS. Activity was on the 136kHz band. Fortunately, static levels were fairly low in Europe. I had daytime two-way QRSS3 contacts, with DL6II and DF6NM.
Anyone looking for some big plastic pipe to wind their kHz coils on should take a look at: www.bbc.co.uk/news/av/uk-england-norfolk-40886835/giant-pipes-wash-upon-norfolk-beaches Mike, G3XDV ==
I made several modifications to get 5A FSD on my meter. Firstly, I used all of the supplied wire to make 17t on the toroid instead of the recommended 10t. I changed the input resistors which were get
It is really interesting to follow the activities of those using the extremely challenging frequencies below 10kHz, but can I make a plea for anyone testing on VLF to give a day or two notice when an
Thanks, Stefan. I will set a receiver up today. I always lock SpecLab to a utility station, but it is a good suggestion to display an Alpha as a check that all is working. Mike, G3XDV From: DK7FC Sen
I would certainly like to try to receive you again on VLF, Stefan. But I understand that EbNaut cannot be seen on a spectrogram. Is that correct? I don't have GPS timing (though I expect to have it b
Knowing the effective height of a Marconi antenna is essential in the calculation of radiated power /antenna efficiency at LF/MF. The formula for this includes figures for the capacitance to ground o
Thanks to Andy (your pages included the important reference to Watts' VLF Radio Engineering) and to Dave for the pages from Watts. I now see how useful it was for Peter Dodd to digest the original da
Thanks to Stefan for transmitting a carrier overnight. This is very useful for those of us who are not quite ready to decode EbNaut transmissions but want to optimise our VLF reception. My screenshot
Stefan, thanks for the comments. My locator is IO92VT, Welwyn Garden City, just north of London. I was using an "equivalent noise bandwidth" of 44uHz which meant around 9 hours per pixel. If you look
Attached is my reception of Stefan's VLF transmission yesterday. Mike, G3XDV == The following section of this message contains a file attachment prepared for transmission using the Internet MIME mess
Unfortunately, nothing at all seen here on 6470Hz. Using the same system as on 8270, but with filter frequency changed, so should be OK. I am not using any preamplification here, just the LF antenna
I will be making some overnight transmissions on the 136kHz band, using Opera32 in the next few days if you would like to monitor. It is possible to run Opera and WSPR receivers at the same time. I w
Yes, WSPR-15 is possible with the U3. I may have to add a fan to the PA, though, as I have never run a 15 minute continuous transmission at full power before. The U3 is an amazing and cheap piece of
After several weeks of monitoring I finally received WSPR from the US last night. The 0352 and 0356 transmissions from K3RWR were decoded with a SNR of -27 and -26dB at 5920km. Is this the first US t
I had to take my antenna masts down prior to Storm Eleanor to avoid damage. It will take me a few days before I can put it back up again. Mike, G3XDV ==
