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341. Re: LF: Spectrum Lab help please! (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Fri, 18 Jun 2010 14:00:11 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00215.html (9,192 bytes)

342. Re: LF: Soundcard frequency calibration for 8.97kHz tests (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Wed, 09 Jun 2010 22:08:20 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00495.html (10,728 bytes)

343. Re: LF: Soundcard frequency calibration for 8.97kHz tests (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 06 Jun 2010 23:55:44 +0200
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").
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00596.html (10,917 bytes)

344. Re: LF: Soundcard frequency calibration for 8.97kHz tests (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 06 Jun 2010 23:19:29 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00693.html (12,990 bytes)

345. LF: CQ Ham Radio - Friedrichshafen (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Tue, 22 Jun 2010 17:30:52 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00709.html (7,945 bytes)

346. Re: LF: Soundcard frequency calibration for 8.97kHz tests (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Tue, 08 Jun 2010 23:39:56 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-06/msg00753.html (12,366 bytes)

347. Re: VLF: SAQ? (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Fri, 16 Jul 2010 18:06:59 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00065.html (13,812 bytes)

348. Re: LF: Re: Re: Re: SAQrx soundcard VLF receiver moved to new web site (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Wed, 14 Jul 2010 18:33:36 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-07/msg00171.html (12,564 bytes)

349. Re: VLF: DK7FC's 6th VLF kite experiment (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 01 Aug 2010 10:02:05 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00093.html (11,216 bytes)

350. Re: VLF: DK7FC's 6th VLF kite experiment (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 01 Aug 2010 16:25:02 +0200
.. 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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00331.html (10,706 bytes)

351. Re: VLF: DK7FC's 6th VLF kite experiment (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 01 Aug 2010 09:56:36 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00482.html (16,568 bytes)

352. Re: VLF: DK7FC's 6th VLF kite experiment (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 01 Aug 2010 11:15:20 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00517.html (13,848 bytes)

353. Re: VLF: DK7FC's 6th VLF kite experiment (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Wed, 04 Aug 2010 23:29:15 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00555.html (14,816 bytes)

354. Re: VLF: DK7FC's 6th VLF kite experiment (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 01 Aug 2010 17:03:20 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00657.html (12,040 bytes)

355. Re: VLF: DK7FC's 6th VLF kite experiment (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 01 Aug 2010 11:47:32 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-08/msg00735.html (15,807 bytes)

356. Re: VLF: Re: DK7FC's 7th VLF kite experiment (score: 1)
Author: wolf_dl4yhf <[email protected]>
Date: Sat, 02 Oct 2010 15:20:03 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-10/msg00011.html (11,964 bytes)

357. Re: VLF: Re: Detections of 5 microwatt transmission (score: 1)
Author: wolf_dl4yhf <[email protected]>
Date: Sun, 17 Oct 2010 13:43:17 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-10/msg00143.html (20,737 bytes)

358. Re: VLF: Stepping signal on 8904 Hz (score: 1)
Author: wolf_dl4yhf <[email protected]>
Date: Sat, 02 Oct 2010 17:50:23 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-10/msg00239.html (13,395 bytes)

359. Re: LF: DK7FC's 8th VLF kite experiment (score: 1)
Author: wolf_dl4yhf <[email protected]>
Date: Sat, 23 Oct 2010 18:27:06 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-10/msg00264.html (9,081 bytes)

360. Re: LF: New OE3GHB grabber online (score: 1)
Author: wolf_dl4yhf <[email protected]>
Date: Thu, 28 Oct 2010 18:21:04 +0200
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
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-10/msg00336.html (9,598 bytes)


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