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181. RE: LF: RE: Iron dust toroids and heating (score: 1)
Author: "Clemens Paul" <>
Date: Thu, 25 May 2017 13:35:44 +0200
Hello Chris, The reason is that the voltage drop across L2 is almost twice as high as across the outer coils, see attached spice simulation. The yellow trace represents the voltage across L1,green ->
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00209.html (11,309 bytes)

182. RE: LF: Iron dust toroids and heating (score: 1)
Author: "Clemens Paul" <>
Date: Thu, 25 May 2017 14:04:44 +0200
Hello Chris, Markus (DF6NM) has given an excellent expanation in his posting from 7/14/2007: "...the PI-type combiner per se is not the problem. All I was trying to say is that you have to prevent it
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00210.html (11,703 bytes)

183. RE: LF: Iron dust toroids and heating (score: 1)
Author: "Clemens Paul" <>
Date: Thu, 25 May 2017 14:28:55 +0200
Hello Chris, Look what the mini ring core calculator is showing (see attachment) and draw your conclusions. The calculations are completely based on amidon data. I've chosen 600V RMS ,that's the volt
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00212.html (13,715 bytes)

184. RE: RE: LF: Iron dust toroids and heating (score: 1)
Author: "Clemens Paul" <>
Date: Sat, 27 May 2017 00:04:43 +0200
Hi Marco, It is indeed. B =V/ (4.44*F*N*A) No,but I was referring to V across L2, not across the load. See the three attached spice simulations. 73 Clemens DL4RAJ Attachment: Voltage across R.JPG Des
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-05/msg00230.html (15,165 bytes)

185. LF: RE: Transformer questions. (score: 1)
Author: "Clemens Paul" <>
Date: Sat, 24 Jun 2017 12:34:18 +0200
Hi Chris, This would be possible but more or less lossy. What is the impedance as seen by your AIM when you measure on the secondary side of the 1:1 isolation transformer with antenna and feeder conn
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-06/msg00235.html (11,475 bytes)

186. RE: LF: RE: Transformer questions. (score: 1)
Author: "Clemens Paul" <>
Date: Sat, 24 Jun 2017 19:36:00 +0200
Hi Chris, Just to be sure, you I'm not sure if I understand your description correctly so I try with a block diagram. Is it like this? TRX - short coax - autotransformer - longer run of RG-213 - isol
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-06/msg00240.html (12,267 bytes)

187. RE: LF: RE: Transformer questions. (score: 1)
Author: "Clemens Paul" <>
Date: Sat, 24 Jun 2017 20:45:48 +0200
And where is the 1:1 isolation transformer inserted? 73 Clemens DL4RAJ
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-06/msg00244.html (12,027 bytes)

188. RE: LF: RE: Transformer questions. (score: 1)
Author: "Clemens Paul" <>
Date: Sun, 25 Jun 2017 14:19:54 +0200
Hi Chris, ok, I hope I have now understood your set up and what you may possibly want to change. Present configuration: And from an earlier post by you: So you want to modify the combiner-autotransfo
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-06/msg00250.html (12,635 bytes)

189. RE: LF: RE: Transformer questions. (score: 1)
Author: "Clemens Paul" <>
Date: Tue, 27 Jun 2017 20:38:13 +0200
Hi Chris, In my first reply from 24.6.2017 "This would be possible but more or less lossy" it was not clear to me that you would possibly like to tap the transformer *of the combiner* and that the LP
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-06/msg00279.html (14,304 bytes)

190. LF: RE: Scopematch question (score: 1)
Author: "Clemens Paul" <>
Date: Sat, 1 Jul 2017 18:18:10 +0200
Hi Chris, At a given power into a load voltage increases at the sqrt of increasing R because U = sqrt(P*R). When a complex load comes into play V increases with |Z| which is sqrt (R^2 +X^2) So at res
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-07/msg00022.html (10,891 bytes)

191. LF: RE: RE: Scopematch question (score: 1)
Author: "Clemens Paul" <>
Date: Sat, 1 Jul 2017 18:25:20 +0200
Forgot to mention that with with electrically small antennas R nearly stays constant around resonance. 73 Clemens DL4RAJ
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-07/msg00023.html (11,887 bytes)

192. LF: RE: LPF for a valve based (tube based) LF amp? (score: 1)
Author: "Clemens Paul" <>
Date: Fri, 4 Aug 2017 14:10:32 +0200
Hi Chris, at the risk to state the obvious: A LPF of a solid state PA has 50 Ohms in- and output impedance. A tube type PA needs a LPF which transforms from several kOhms on the tube side to 50 Ohms
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00005.html (11,617 bytes)

193. RE: LF: RE: LPF for a valve based (tube based) LF amp? (score: 1)
Author: "Clemens Paul" <>
Date: Fri, 4 Aug 2017 15:36:22 +0200
Hi Wolf, ok about the tank circuit. Do you think that it does not provide enough attenuation for the harmonics so that you need an extra LPF on LF? 73 Clemens DL4RAJ
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00008.html (10,665 bytes)

194. LF: RE: Telefunken (score: 1)
Author: "Clemens Paul" <>
Date: Mon, 14 Aug 2017 16:01:49 +0200
Hi Lubos, go to http://www.classicbroadcast.de/telefunken_download.html then press contr+f for searching the site. Enter just LW 638 (the space is important!) in the mask and you'll hit immediately t
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00072.html (10,564 bytes)

195. RE: LF: Effective antenna height? (score: 1)
Author: "Clemens Paul" <>
Date: Sat, 23 Sep 2017 17:25:45 +0200
Hi Claudio and VLFers, Also this book is downloadable: http://www.introni.it/pdf/Watt%20-%20VLF%20Radio%20Engineering%2014.pdf I've just verified that the link is still valid and working. 73 Clemens
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-09/msg00145.html (9,400 bytes)

196. RE: LF: Effective antenna height? (score: 1)
Author: "Clemens Paul" <>
Date: Sat, 23 Sep 2017 18:07:42 +0200
... ... On page 40 where the capacitance formulas are given reference is made in a footnote to a paper from 1926 and to Terman's Radio Engineers Handbook from 1943. 73 Clemens DL4RAJ
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-09/msg00147.html (10,336 bytes)

197. LF: RE: MF/630 (score: 1)
Author: "Clemens Paul" <>
Date: Sun, 8 Oct 2017 21:22:44 +0200
Mal, I can decode you with 0dB. 73 Clemens DL4RAJ =link&utm_campaign=sig-email&utm_content=emailclient> Virenfrei. =link&utm_campaign=sig-email&utm_content=emailclient>
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-10/msg00067.html (10,107 bytes)

198. RE: VLF: VO1NA in Todmorden on 8270 Hz (score: 1)
Author: "Clemens Paul" <>
Date: Sun, 29 Oct 2017 16:31:06 +0100
There is a article from ARRL,see http://www.arrl.org/news/tiny-lf-signal-makes-the-hop-from-newfoundland-to-the-uk = sent from my gpo creed 7b teleprinter + + 73 Clemens DL4RAJ
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-10/msg00303.html (10,303 bytes)

199. LF: RE: 630m acty (score: 1)
Author: "Clemens Paul" <>
Date: Wed, 1 Nov 2017 21:16:27 +0100
Hi Stefan and MF'ers, And DL3NDR is transmitting *continously* in WSPR since hours. Maybe his PTT keying has get locked? I also see a ca. -40dBc sideband 60Hz above his tx qrg on two different receiv
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-11/msg00007.html (9,708 bytes)

200. LF: Strange signal on MW (score: 1)
Author: "Clemens Paul" <>
Date: Thu, 23 Nov 2017 21:37:07 +0100
Hello MWers! I see and hear a strange noisy broad signal sweeping between about 475,2 and 475.6kHz. On the waterfall it looks like a jamming signal from a SPSU. But I can see and hear it also on the
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-11/msg00190.html (10,550 bytes)


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