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Total 673 documents matching your query.

281. Re: LF: keep cool (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Tue, 05 Dec 2000 17:01:14
Hello Mal, Thanks for your tips to prevent the loadingcoil from overheating, this will be usefull for those who can get 10A or more into the antenna. Just one remark : Dont waste all those hundreds o
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00484.html (9,297 bytes)

282. LF: weekend 1-3 december (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Tue, 05 Dec 2000 15:18:57
The reflector seems to be working again, so here comes a short weekend report : - M0BMU was seen with a good 'O' signal on 70.65kHz, beaconing with call and locator. Signal was audible but too weak f
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00489.html (9,292 bytes)

283. LF: Noise at night (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Wed, 31 Jan 2001 16:57:50
If a significant part of the nighttime QRN/QRM is realy coming from the east then a directional receiving antenna should be considered. Two small loops spaced 1/8 wavelength (275m) and fed with 90 de
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00013.html (9,165 bytes)

284. LF: CFH back on air ? (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Wed, 31 Jan 2001 10:11:14
Last night the was a carrier on 137.040 (+/-) was S4 at 19.30 UT and went up and down between S2 and S8. It was still on at 23 UT when I went to bed. It seemed an unmodulated carrier to me. Maybe Ala
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00037.html (8,100 bytes)

285. Re: LF: Earth Rods / Spectrograms (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Tue, 30 Jan 2001 16:14:18
I was really amused at the 'China Syndrome' thought. That hadn't occurred to me (it's rock here), but it is a valid point, hi! It sure is, the first time I 'watered' a rod in the soil I didn't secure
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00054.html (9,055 bytes)

286. Re: LF: Earth Rods / Spectrograms (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Tue, 30 Jan 2001 11:47:56
I found an easy way to drive in earth rods made from copper water pipe is like this: I found a steel rod of a slightly bigger diameter than the pipe, put a point on the end, and hammered it in to the
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00065.html (9,843 bytes)

287. Re: LF: Re: VA3LK seen in ON (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Tue, 30 Jan 2001 10:38:29
I have just looked around and I can not find the file I referenced, please send me a description of DFCW, I am of the impression, apparently wrong, that DFCW involved dual frequencies, which I have i
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00066.html (10,077 bytes)

288. Re: LF: Re: VA3LK seen in ON (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Fri, 26 Jan 2001 18:41:15
I studied DFCW and the linear requirement is not possible of course. Larry, to avoid misunderstandings : DFCW does not need linear amplification. 73, Rik ON7YD
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00171.html (9,363 bytes)

289. Re: LF: Re.Re LF Beacon signals (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Fri, 26 Jan 2001 18:36:26
Laurie, you're right about the 8-shaped pattern, in fact the pattern is very similar to that of a lambda/2 dipole (in free space). A Marconi antenna has more directivity than a loop (4.8dBi versus 1.
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00173.html (9,043 bytes)

290. LF: Time efficient code (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Fri, 26 Jan 2001 15:50:50
If we want to develope a new 'code' for a time effecient mHz bandwidth modulation first thing we should do is to make a list of requirements. My list would be : - suitable with non-linear amplifiers
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00181.html (9,958 bytes)

291. Re: LF: Re LF Beacon signals (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Fri, 26 Jan 2001 15:09:00
Hi Laurie, The other thing is what about a Loop Rx ant.? that should give a few dbs improvement in S/N due to directivity. A loop can be very efficient to null out one source of QRM/QRN, due to the v
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00182.html (8,959 bytes)

292. Re: LF: RE: VA3LK seen in ON (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Fri, 26 Jan 2001 13:07:46
Alberto, besides the need for a linear PA each of the tones would also have only 50% of the power. Wouldn't that 'give away' 3dB SNR ? 73, Rik ON7YD Just out of curiosity : I was thinking, a few week
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00188.html (9,921 bytes)

293. LF: VA3LK seen in ON (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Fri, 26 Jan 2001 10:49:30
Hi Larry, I had a look for you this morning and saw a interrupted trace popping up just over the noisefloor. QRN was bad, but I could make a VA out of it (with some imagination). I'm pretty sure to h
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00191.html (10,132 bytes)

294. Re: LF: Re: VA3LK beacon (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Thu, 25 Jan 2001 14:59:40
Larry, sorry if I caused any misunderstandings, I wasn't aware that the beacon is at a remote site. I will try to copy your signal in the morning and let you know if I have any succes. Thanks for tak
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00209.html (9,648 bytes)

295. LF: VA3LK beacon (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Thu, 25 Jan 2001 13:18:48
Hi Larry, I'd like to give it another try to copy your beacon over the weekend as best chances seems to be just after sunrise (in Europe). Is your beacon still non stop in the air ? I believe you are
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00214.html (8,543 bytes)

296. Re: LF: Stability (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Thu, 25 Jan 2001 13:10:14
hi Mike, what antenna are you using for receiving ? I'm using my transmitting antenna and found that I can add up to 40dB attenuation between antenna and RX (Kenwood TS440) before the bandnoise hits
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00215.html (8,900 bytes)

297. Re: LF: Beacon signals tonight (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Thu, 25 Jan 2001 10:50:04
I measured the frequency difference as 1.75Hz at 20.30UT (using Spectogram). I can not measure absolute strengths but the higher frequency was 2dB stronger here. Both signals were well above noise, w
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00222.html (10,540 bytes)

298. Re: LF: Waterproof Loading Coil (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Wed, 24 Jan 2001 18:15:01
At 10:49 24/01/01 -0500, DK8KW wrote: ... I don't really understand why and how my own setup works ... a large loading coil (3.8 mH) about 1/3 height up the mast .... in wind and rain and snow, witho
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00253.html (8,997 bytes)

299. Re: LF: Please more normal CW activity on Saturday and Sunday morning (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Wed, 24 Jan 2001 11:54:44
I have a bit of a problem with some recent mails. I agree that CW activity has decreased over the last months but I do not thing that QRSS is to blame for it. Apart from one case of unintentional QRM
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00269.html (11,707 bytes)

300. Re: LF: Re: vector potential (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Tue, 23 Jan 2001 10:32:47
Hi Peter, I did a little test on saturday afternoon : I did put the lower part of the loading coil (that is normally in horizontal position) vertical (directly under the wire). I did measure the ante
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-01/msg00320.html (9,337 bytes)


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