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241. Re: LF: Re: 136kHz WSPR experiment (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Sat, 27 Jan 2018 00:59:08 +0100
Hi Jacek on my own checks it seems to be posters out side the UK who occasionally have trouble ( some ISPs are permanently locked out it seems). I also noticed on the turn of the year there are a lot
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00371.html (13,110 bytes)

242. LF: Re: 136kHz T/A this weekend (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 19 Feb 2018 14:09:57 +0100
Hi Mike I had been watching triggered by a comment from Steve Nichols preparing the RSGBNews Prop report. The Thursday geomag event was much weaker than expected I havent checked but I suspect the IM
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00377.html (11,173 bytes)

243. LF: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one? (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Thu, 08 Mar 2018 15:10:21 +0100
Chris my take on this.....not having used this level of power at LF.....if the core is gettting hot it is not providing a particularly high Q !! My line is that LPF are best made with air cored induc
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00055.html (12,237 bytes)

244. LF: Re: RE: Re: Can an air cored LPF inductor have as high a "Q" as a toroidal wound one? (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Fri, 09 Mar 2018 21:18:40 +0100
Hi Clemens yes I realised that from later posts I should have realised materials 2 & 3 were iron dust. I doubt from the reports that it is getting to the kind of temperatures that would give non-line
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00073.html (13,377 bytes)

245. LF: Re: Antenna splitter question (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Wed, 14 Mar 2018 00:11:09 +0100
Chris if you are not listening to the same frequency on both you dont want a splitter you need a diplexer. This is effectively two filter with a common input, one is lowpass for LF one is HP for MF (
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00093.html (10,468 bytes)

246. LF: Re: RE: Antenna splitter question (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Wed, 14 Mar 2018 16:15:37 +0100
Hi Clemens I agree with that but the splitter loses you 6dB on both sides against the diplexer :-)) Probably not significant at LF/MF but it can give some protection against out of band big signals.
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00098.html (10,629 bytes)

247. Re: LF: RE: RE: Antenna splitter question (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Thu, 15 Mar 2018 14:10:29 +0100
Hi Chris, no Worms :-)) its just that simple questions often have a ''less than simple'' answer :-)) Alan -- Original Message -- From: "Chris Wilson" <[email protected]> To: "Clemens Paul" <rsgb_lf
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00110.html (11,522 bytes)

248. Re: LF: Pre amp *after* BPF?? (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Sat, 17 Mar 2018 17:29:53 +0100
Hi Mike I would agree with that. When I started trying to record stations in the pre-waterfall period (DCF, SXV, CFH etc near 136 I had a thick band on the plot around 8 to 10dB wide. I experimented
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00141.html (13,464 bytes)

249. Re: VLF: DL to VK7 ? (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Sat, 17 Mar 2018 22:35:23 +0100
Hi Jim that would be a good idea, but may not be necessary. I seem to remember that the NATO VLF station in Europe have very stable phase. (Stanford report using phase variation on Jim Creek for SID
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00144.html (18,630 bytes)

250. LF: Re: 2200m Trans-Atlantic QSO dream... (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 19 Mar 2018 17:54:48 +0100
Lots of people talk about a ''season'' but in propagation terms there isn't one. you can get as good a propaga tion in summer as in winter. There is possibly less noise to listen to in winter and the
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00167.html (10,848 bytes)

251. LF: Re: Loran line (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Thu, 22 Mar 2018 01:01:08 +0100
Hi Laurence I think Anthorn is still running though its a slave without a master since Lessay and Sylte closed Trinty house are probably still paying the lecky bill to Babcock Int. I think the contac
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00222.html (10,824 bytes)

252. LF: Re: MF path to Reunion still alive (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Fri, 23 Mar 2018 12:05:04 +0100
Hi Luis that is interesting. I presume signal and spotter were active during the the earlier low Dst period?? I had wondered whether that path might not be so severely affected by electron precipitat
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00240.html (10,912 bytes)

253. LF: Re: RE: Re: MF path to Reunion still alive (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Fri, 23 Mar 2018 15:07:14 +0100
Ok Luis thank you for that, I find it one of the problems with WSPR that one doesnt know when the stations are off-air or spots not loaded, power changed, timing changed. I suppose if one analysed en
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00249.html (20,680 bytes)

254. Re: LF: Spectrum Lab question (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 26 Mar 2018 16:26:50 +0100
Paul Spectrum Lab is very ''technical'' and very flexible. For visual modes download Alberto's Argo. It won't do EbNaut but it has a proud history in LF visual modes since about 2003 it will also ser
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00330.html (12,051 bytes)

255. Re: LF: CORRECTION regarding 2E0ILY-N1BUG QSO (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Sat, 31 Mar 2018 18:06:49 +0100
Paul and Markus, I was triggered to do a little searching today. (BTW I did NOT say there HAD been US<>EU 2-way QSOs with Warren K2ORS's Part 5 licencees, I just indicated I thought it unlikely there
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-03/msg00412.html (15,103 bytes)

256. Re: LF: CORRECTION regarding 2E0ILY-N1BUG QSO (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Sat, 31 Mar 2018 23:26:57 +0100
Hi Alex yes I am sure we all had our bouts of 'unlicenced experimentation' The LF community was so small that anything like a T/A qso would probably not go unnoticed. RU6LAs collection of events was
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00002.html (16,979 bytes)

257. Re: LF: W1VD amp help - more waveforms (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 9 Apr 2018 15:21:48 +0100
Paul I think you need to step back from this a little. One point, design/cable routing at 137kHz is normally not that critical and it is unlikely it is having much effect. Many us have ''haywired'' P
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00120.html (18,534 bytes)

258. Re: LF: W1VD amp help - more waveforms (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 9 Apr 2018 16:26:34 +0100
Hi Jay yes indeed but I think that the Vds(max) is quite high, and certainly not a prob at 12v, or even 28v. Alan -- Original Message -- From: <[email protected]> To: <[email protected]
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00124.html (20,223 bytes)

259. Re: LF: W1VD amp help - more waveforms (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 9 Apr 2018 18:39:01 +0100
Ah I see what confused me.....I missed the first spike which is up to the top of the screen and not so obvious because of the shadow. That is high for 13v but the usual design criterial is to allows
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00131.html (20,762 bytes)

260. Re: LF: W1VD amp help - more waveforms (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Thu, 12 Apr 2018 21:43:41 +0100
Paul, Chris, Jay et al Just a wild thought....Jays LPF is not inside the PA box. The filter is giving a frequency dependent load on the PA. Could it be possible that some reflected impedance is exage
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-04/msg00202.html (15,876 bytes)


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