Return to KLUBNL.PL main page

rsgb_lf_group archive search

181. Re: LF: Almost (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Sat, 30 May 2015 23:56:15 +0200

Hi Mike, thanks for the explanations, nice work indeed! I am are also plagued by a lot of local interference from our dense suburban neighbourhood. especially on MF there seems to be a surprising div

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00332.html (17,397 bytes)

182. Re: re:Re: LF: Almost (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Sun, 31 May 2015 00:36:06 +0200

Hi Mike, you won't need separate receivers and PCs just for observing WSPR at both speeds. Frequency bands are adjacent and based on the same dial frequency (475.2 kHz USB). All you need to do is run

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00335.html (21,429 bytes)

183. Re: re:Re: LF: Almost (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Sun, 31 May 2015 00:40:26 +0200

sri, dial 474.2 kHz, once more... From: markusvester@aol.com Markus Vester Sent: Sunday, May 31, 2015 12:36 AM To: rsgb_lf_group@blacksheep.org rsgb_lf_group@blacksheep.org Subject: Re: re:Re: LF: Al

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00337.html (22,268 bytes)

184. LF: Dual-speed WSPR (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Sun, 31 May 2015 01:28:58 +0200

To allow SNR comparisons at different speeds, I will transmit a mixed-mode beacon tonight. It will consist of two WSPR-2 sequences, before and after a WSPR-15 sequence on each odd half hour: hh:28 -

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00341.html (9,363 bytes)

185. Re: LF: Dual-speed WSPR (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Sun, 31 May 2015 02:07:29 +0200

Yeah maybe. But at the moment I'd rather keep things as simple as possible, and I anyway wouldn't expect a sharp optimum regarding speed. The idea is to compare the SNR of the slow sequence with the

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00343.html (14,610 bytes)

186. Re: LF: Dual-speed WSPR (score: 1)

Author: Markus Vester <markusvester@aol.com>

Date: Sun, 31 May 2015 16:07:09 -0400

Hi Wolf, thanks for sharing your observations. In theory. as the SNR output is scaled to the same reference bandwidth (2.5 kHz), it should be independent of speed and (on average) identical for both.

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-05/msg00352.html (23,493 bytes)

187. Re: LF: Small MF ferrite antenna games (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Tue, 2 Jun 2015 00:11:00 +0200

Stefan, antenna by combing the signals of E and H within SpecLab? It is only a mixing of these two signals with a different 'weight', right? This could be done in the 'left to right output amp', righ

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00017.html (18,902 bytes)

188. Re: LF: Dual Mode WSPR Beacon running again (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Tue, 2 Jun 2015 22:35:08 +0200

Hi Andy, LF, attached are examples of SNR plots for WSPR-15 (blue, G8IMR) versus WSPR-2 (red, G4JNT), as extracted from the spot database. Times are hours after midnight last night (ie -2 means 22 UT

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00022.html (12,215 bytes)

189. Re: LF: USB stereo soundcard, CHEAP!? (score: 1)

Author: Markus Vester <markusvester@aol.com>

Date: Wed, 3 Jun 2015 12:54:57 -0400

Good Question! If u find 1, I w1t 1 2 ... 73, Markus --Ursprüngliche Mitteilung-- Von: DK7FC <selberdenken@posteo.de> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org> Verschickt: Mi, 3 Jun 2015 6:46

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00028.html (11,249 bytes)

190. Re: LF: Dual Mode WSPR Beacon running again (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Wed, 3 Jun 2015 23:50:55 +0200

Here are some more example plots from last night, June 2 / 3. To be honest, I can't find much confirmation for my earlier statement of WSPR-15 generally showing higher SNR (with the one exception of

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00042.html (13,537 bytes)

191. Re: LF: Re: USB stereo soundcard, CHEAP!? (score: 1)

Author: Markus Vester <markusvester@aol.com>

Date: Fri, 5 Jun 2015 12:54:42 -0400

Thanks Paul-Henrik and Alan, just ordered a couple of those. There seems to be a similar looking device for only 3.28 Euro on http://www.ebay.de/itm/311030647266 which may or may not be the suspected

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00069.html (13,981 bytes)

192. LF: Gamma spectroscopy (off topic) (score: 1)

Author: Markus Vester <markusvester@aol.com>

Date: Fri, 5 Jun 2015 13:05:38 -0400

Hi Paul-Henrik, I'd be interested to learn more about your soundcard gamma spectrometer, is there a description on the web? The reason why I'm asking: I recently stumbled across several rather enligh

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00070.html (14,052 bytes)

193. Re: LF: Gamma spectroscopy (off topic) (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Sat, 6 Jun 2015 02:04:06 +0200

Hi Paul-Henrik, wow, what a wealth of information and hints. That will give me plenty to read, and I'll surely come up with more questions thereafter. Thanks a lot! 73, and have a good trip, Markus (

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00075.html (20,137 bytes)

194. Re: LF: Re: USB stereo soundcard, CHEAP!? (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Wed, 10 Jun 2015 23:15:47 +0200

Two of those http://www.ebay.de/itm/121666143901 (seller audvidcom2, 13.90 per piece + 1.70 postage, originally Paul-Henrik's link) arrived today Plugged them in and found that they are good: 96 kHz

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00090.html (17,535 bytes)

195. RE: LF: EA5DOM <crazy> vertical (score: 1)

Author: Markus Vester <markusvester@aol.com>

Date: Fri, 12 Jun 2015 05:23:31 -0400

Hi Luis, This might make some sense. A slant loop could be seen as a superposition of a big horizontal loop (which doesn't radiate), plus a low vertical loop (which weakly radiates in a figure-eight

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00097.html (16,552 bytes)

196. Re: LF: WWVB decoded (score: 1)

Author: Markus Vester <markusvester@aol.com>

Date: Sat, 13 Jun 2015 08:12:56 -0400

Hi Edgar, now that's impressive, you should tell them about it! I'm wondering if you couldn't even pull it off also for MSF, your most distant time signal station. The season is good, as you may now

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00099.html (11,079 bytes)

197. Re: LF: VLF vorbis stream, Question (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Sat, 20 Jun 2015 23:01:00 +0200

Hi Stefan, I don't really know the answer but here's a guess: If I remember right, your MF receiver gets the signal from the antenna through a mechanical filter. The passband is some 8 or 10 kHz wide

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00117.html (16,819 bytes)

198. Re: LF: LF activity 22 june (score: 1)

Author: Markus Vester <markusvester@aol.com>

Date: Mon, 22 Jun 2015 03:37:51 -0400

Hi Alex, had a look at some of the grabbers last night and saw your signal twice in Bucharest, Heidelberg, and Nuernberg (see attached screenshot from the second transmission 22:29 - 22:54 UT). Opds

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00121.html (10,977 bytes)

199. LF: 476.181 kHz from indoor loop (score: 1)

Author: Markus Vester <markusvester@aol.com>

Date: Wed, 24 Jun 2015 06:11:17 -0400

I am currently running a DFCW-60 beacon on 476.181 kHz, using the same 10m^2 indoor transmit loop as previously on LF. With 35 Watts of RF input, estimated radiated power is around 2 mW, with lobes p

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00132.html (10,059 bytes)

200. Re: LF: 476.181 kHz from indoor loop (score: 1)

Author: "Markus Vester" <markusvester@aol.com>

Date: Wed, 24 Jun 2015 21:07:56 +0200

Hi Mauro, this is a single turn loop, around 3.5 m wide and 3 m high, now consisting of the braid of a piece of RG-216 coax cable. Required capacitance for 475 kHz is 7.1 nF, made from five 33nF FKP

/rsgb_lf_group-archives/html/rsgb_lf_group/2015-06/msg00134.html (14,025 bytes)