Hello Harry, I'd also vote to update to Spectrum Lab V2.75 b11 (or later), and use one of the 'Very Slow CW' configs from the menu. Do I use "image cancelling DC receivers" These are only for softwar
Hi Laurence and group, Sorry, your provider hotmail rejected the following message (it has blacklisted mine for whatever reason), so I'm sending it this way... Wolf - thanks for the latest - all load
The b11 version, which will be out soon.. including two preconfigured settings for Dreamer's Band. For the impatient, try b10, and load DF6NM's settings (through the file menu, "Load Settings From").
Hi Roger and group, I will try to explain the procedure in simple words, as soon as time permits, possibly tomorrow. A (probably too long) detailed explanation of how the continuous sampling rate 'ca
Just in case someone here also visits the Ham Radio fair in Friedrichshafen (July 25 - 27) : I will put out a few local 'cq LF' calls on 439.475 MHz in FM on friday 25 th, and visit the RSGB stand ar
Hello Mike and the group, I have now published it, as a 'Beta' version, here: http://dl4yhf.ssl7.com/speclab/install_speclab_beta.zip ('subject to frequent change', this one is actually Spectrum Lab
Not 100 % sure if it's SAQ but Peter's Longwave Monitor confirms your observation: http://www.df3lp.de/cgi-bin/fh/plot_channel.cgi?date=10-07-16&freq=17.2KHz Cheers, Wolf . Stefan Schäfer schrieb: VL
Hello Roelof, Stefan, and the group, I have a Perseus, but don't use it for VLF due to the input filters, so cannot comment on its performance there. What I did use for "portable" operation (before d
This has just been posted by Paul Nicholson (QTH Todmorden) in the yohoo VLF group: I'm also on receive, and streaming to Paul's server. If anyone in southern DL has found Stefan's exact TX frequency
.. just getting visible on Stefan's own grabber, arond 6470 Hz : http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html Here, in northern DL, strong QRN making copy very difficult. Che
Horst, You need to change the frequency of the "1st mixer" : Options.. FFT Settings ... Center Frequency [Hz] . This reprograms the software NCO, and thus the displayable frequency range. Cheers, Wol
Hello Markus and group, Thanks for the info .. Markus Vester schrieb: Dear Roger, LF, the weak line on 8970.2 Hz has often been visible on Stefan's grabber, seems to be some sort of local spur. Talke
Hi Daniele, Yes, the sferic blanking and / or clipping can be done in Spectrum Lab, too. Paul uses his on Linux-based toolchain of analysis programs, but the principle is very similar. What I will ad
Hi Peter, yes the noise is terrible at the moment. But after activating a clipper, level 3 dB above average, the signal now looks better. See attached screenshot (taken from the same signal fed to th
Not sure, but on Markus' grabber I now see something around 6500.05 Hz : http://www.mydarc.de/df6nm/vlf/vlfgrabber.htm Nothing seen here (in JO42FD) yet, besides a few faint drifting lines. Cheers, W
Again "oo" copy until 12:5x UTC, here now back at 22 mHz FFT bandwidth. 73 and GL everyone, Wolf DF0WD / DL4YHF . P.S. Markus - I didn't hear Stefan on 144.060 MHz but keep sending occasional reports
Congrats Markus and Paul for this achievement ! I think you used a GPSDO with 10 kHz output on both ends - Thunderbolt, Trimble, or similar ? (still thinking about a simple but reliable, non-GPS solu
Hello Markus, Daniele, and group, Yes... strange indeed. The signal seems to be symmetrically around a center of ( 8907 Hz +9085.5 Hz ) / 2 = 8996.25 Hz, like "sidebands" (see screenshots below), bu
Stefan's 8970 Hz signal SNR was over 20 dB with 200 uHz effective receiver bandwidth, observed at DF0WD (rural area) with a small, resonant, active loop antenna hanging in a tree. Screenshot here: ht
Hello Gerhard, Today I swapped the RX of my grabber to SDR and the antenna to a PA0RDT-design. I also did some minor changes to my grabber-page. (..) I do not use a I/Q-setup, though the RX is I/Q. I
