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Total 325 documents matching your query.

1. LF: Simple audio clipper (score: 1)
Author: "Dick Rollema" <>
Date: Mon, 6 Dec 1999 15:59:26 +0100
To All from PA0SE On LF I use a simple audio signal clipper that brings all signals in the headphones to the same level. It may not improve readibility but makes listening much less tiring by limitin
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00012.html (11,118 bytes)

2. LF: Aerial insulators (score: 1)
Author: "Dick Rollema" <>
Date: Thu, 16 Dec 1999 12:03:56 +0100
To All from PA0SE I can supply against cost of shipping a limited number of professional quality aerial insulators. They are dog bone shaped (a centre part of 2.5 cm diameter with 3.5 cm diameter end
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00073.html (8,913 bytes)

3. LF: Signals measured (score: 1)
Author: "Dick Rollema" <>
Date: Wed, 5 Jan 2000 17:03:55 +0100
A Happy New Year to All from PA0SE! It is my intention to measure signals received here as I did twice before. I will listen and measure during the morning and perhaps part of the afternoon coming Sa
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00025.html (9,369 bytes)

4. LF: Results of signals measured (score: 1)
Author: "Dick Rollema" <>
Date: Mon, 10 Jan 2000 15:44:02 +0100
To All from PA0SE Here are the results of my signal measurements during the weekend Time Call Field strength Input RX S-report Remark UTC dB(uV)/m dBm Friday January 7 2328 CFH? (137 kHz RTTY) 27 -70
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00089.html (31,412 bytes)

5. Fw: LF: Loops (score: 1)
Author: "Dick Rollema" <>
Date: Wed, 12 Jan 2000 10:14:45 +0100
To All from PA0SE Provided you are not too bothered about the deep nulls loop antennas with side-by-side windings are good for DX if they are over a metre in diameter. This construction (see the PA0S
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00119.html (8,465 bytes)

6. LF: Re: LORAN-C (score: 1)
Author: "Dick Rollema" <>
Date: Wed, 19 Jan 2000 13:26:46 +0100
To All from PA0SE Hi folks! Just for information, I've found and interesting Web page regarding LORAN C. You'll find the complete list of transmitters, with their locations and power output, at: http
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-01/msg00218.html (8,947 bytes)

7. LF: Re: LF Antenna Radiation (score: 1)
Author: "Dick Rollema" <>
Date: Wed, 9 Feb 2000 11:14:15 +0100
To All from PA0SE Jim, M0BMU, wrote Comparing these calculated field strengths with the measured values shows that the actual field stength is about 7.5dB down on the calculated field strength. Incre
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00104.html (11,352 bytes)

8. LF: Surface Wave (score: 1)
Author: "Dick Rollema" <>
Date: Wed, 9 Feb 2000 15:11:57 +0100
To All from PA0SE Further to my email of 11.14: I'm afraid I did not make very clear that the vertical radiation pattern of antennas, as found in the books, do not include the surface wave. The null
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00107.html (8,883 bytes)

9. LF: Re: "Low loss inductors" ..EW&WW (score: 1)
Author: "Dick Rollema" <>
Date: Sat, 26 Feb 2000 10:44:02 +0100
To All from PA0SE Hi All, a little technical conundrum . I was musing about some of the text in the article flagged up by Christer in Electronics World (Wireless World to all us older ones!) It gives
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00261.html (13,331 bytes)

10. LF: Re: Re: Low loss inductors (score: 1)
Author: "Dick Rollema" <>
Date: Sun, 27 Feb 2000 11:31:43 +0100
To All from PA0SE I find that rather impossible to believe - 300m of thick cable being a dummy load at 137kHz ! Go back to the fundamental equations and calculate properly rather than rely on tables
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00272.html (14,061 bytes)

11. LF: Re: Field strength measurements (score: 1)
Author: "Dick Rollema" <>
Date: Sun, 27 Feb 2000 15:55:03 +0100
To All from PA0SE Last weekend I made some field strength measurements on my own station. http://home5.swipnet.se/~w-54761/fs.htm I use an untuned loop and a selective level meter. The output from th
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00275.html (11,363 bytes)

12. LF: Re: Re: Low loss inductors (score: 1)
Author: "Dick Rollema" <>
Date: Mon, 28 Feb 2000 15:28:39 +0100
To All from PA0SE I am strongly of the view that coaxial cable with the far end either short or open termination is mostly reactive at LF when "looking" in to the near end of the cable. The main issu
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00296.html (11,706 bytes)

13. LF: 73 kHz (score: 1)
Author: "Dick Rollema" <>
Date: Tue, 7 Mar 2000 09:56:11 +0100
To All from PA0SE Having recently installed Spectogram I gave it a try on 73 kHz this morning. It works perfectly and I saw several G-stations. But I also copied them by ear! Reports by ear are: G3XT
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00076.html (9,423 bytes)

14. LF: Cross band QSO's 73/136 kHz (score: 1)
Author: "Dick Rollema" <>
Date: Tue, 7 Mar 2000 15:55:24 +0100
To All from PA0SE Just made cross band normal CW QSO's with M0BMU (sent 559, received 559) and G3LDO (sent 569, received 559). My antenna system was tuned to 136 kHz. But tuning to 73 kHz probably wo
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00084.html (8,353 bytes)

15. LF: Re: Antennas (score: 1)
Author: "Dick Rollema" <>
Date: Fri, 10 Mar 2000 12:30:21 +0100
To All from PA0SE Software such as EZNEC gives the result that there is zero propagation along the horizontal with anything other than perfectly conducting ground, but we all know this is not so. Tha
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00121.html (9,024 bytes)

16. LF: Re: 73kHz Cross - band QSO's (score: 1)
Author: "Dick Rollema" <>
Date: Thu, 23 Mar 2000 20:39:50 +0100
It makes me happy to learn that England is not part of Europe. That makes my G-QSO's not only international, but even intercontinental .... .. 73, Dick, PA0SE
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00228.html (8,476 bytes)

17. LF: Re: Re: Fast CW and big antennas... (score: 1)
Author: "Dick Rollema" <>
Date: Thu, 30 Mar 2000 19:44:13 +0200
To All from PA0SE Older LF Receivers. While at Amberley museum, a few weeks ago, I came across a Marconi receiver, the CR200. It covers from about 15 to 500kHz in 4 bands so I asked if I could borrow
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00304.html (11,638 bytes)

18. LF: Re: Re: S-meter readings... (score: 1)
Author: "Dick Rollema" <>
Date: Thu, 6 Apr 2000 11:13:02 +0200
OK thanks. I have a clearer picture now. Doing a napkin analysis and taking into account the logarithmic nature of the S-meter readings, it seems that, for example, if you have, say, S5 noise alone
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00068.html (9,956 bytes)

19. LF: LF-Group at Hastings (score: 1)
Author: "Dick Rollema" <>
Date: Sun, 9 Apr 2000 13:53:27 +0200
To All from PA0SE David, G0MRF, requested reports on their signal from their Hastings beach location. So I set-up my measuring equipment. G0MRF/G4KLF certainly had a nice signal but not as strong as
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00098.html (16,805 bytes)

20. LF: Fw: Opration from ex-Decca station (score: 1)
Author: "Dick Rollema" <>
Date: Wed, 12 Apr 2000 12:17:49 +0200
To All from PA0SE At 1737 UTC I heard and worked G3WSC/P with Derek, G3GRO at the key. Their signal was -70 dBm (S9 + 3dB) at the receiver input. The corresponding field strength is 32 microvolt/mete
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00121.html (9,495 bytes)


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