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Total 21 documents matching your query.

1. Re: LF: Closure of German Longwave Broadcast (score: 1)
Author: Richard Rogers <>
Date: Thu, 01 Jan 2015 07:35:43 +1100
Very well said. On 01-Jan-15 2:21 AM, Markus Vester wrote: As announced before, the German longwave broadcast transmissions on 153 and 207 kHz (Deutschlandfunk) and 177 kHz (Deutschlandradio) will be
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-12/msg00326.html (14,800 bytes)

2. Re: LF: Fwd: Licence variations (score: 1)
Author: Richard Rogers <>
Date: Fri, 09 Jan 2015 07:52:17 +1100
What is RSL E? Please explain. On 09-Jan-15 12:24 AM, Stewart Bryant wrote: FYI -- Forwarded Message -- Subject: Licence variations Date: Thu, 8 Jan 2015 11:29:34 +0000 From: Graham Coomber <Graham
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-01/msg00194.html (16,178 bytes)

3. Re: LF: Low Pass Filtering (score: 1)
Author: Richard Rogers <>
Date: Mon, 14 Jan 2019 09:01:05 +1100
G'day Andy, When Robert AX2TAR was experimenting on 180KHz, he tried a transmitter of my design without the low pass filter. I could hear his 3rd harmonic and the 17th, 19th, 21st and 23rd harmonics.
/rsgb_lf_group-archives/html/rsgb_lf_group/2019-01/msg00161.html (14,480 bytes)

4. LF: Compact fluorescent lamps (score: 1)
Author: Richard Rogers <>
Date: Fri, 03 Apr 2009 17:13:00 +1100
G'day, I have been modifying my LF receiving setup to suit the 136KHz band which will soon be available here and found that a compact fluorescent lamp in my kitchen was noisy on 136KHz. Other compact
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-04/msg00100.html (8,785 bytes)

5. Re: LF: Information (score: 1)
Author: Richard Rogers <>
Date: Sat, 30 May 2009 20:57:31 +1000
Try http://www.hy-q.com.au lawrence mayhead wrote: Does anybody manufacture Xtals to specific frequencies these days? I have trawled Google to no avail, unless I want to go to China!!! Nothing in Rad
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00380.html (10,644 bytes)

6. LF: General Electric Review 1920 (score: 1)
Author: Richard Rogers <>
Date: Wed, 16 Dec 2009 17:55:43 +1100
G'day. There's a copy of the General Electric Review on Ebay at the moment which contains articles about the Anderson alternator and aerial system as used at SAQ. See http://shop.ebay.com.au/rdc1601/
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-12/msg00410.html (8,111 bytes)

7. LF: High Voltage Phenomena (score: 1)
Author: Richard Rogers <>
Date: Fri, 09 Dec 2011 08:46:14 +1100
G'day, LF high power merchants may like to read Radio Frequency High Voltage Phenomena by Alford and Pickles in Electrical Communication for October 1939. It's available at http://archivodigital.coit
/rsgb_lf_group-archives/html/rsgb_lf_group/2011-12/msg00651.html (9,172 bytes)

8. Re: LF: LF E-H combiner, ideas? (score: 1)
Author: Richard Rogers <>
Date: Fri, 24 Aug 2012 09:04:00 +1000
G'day, When I used to listen to the ZLs on 180KHz (15 years ago!), I used an active vertical and a loop combined in this circuit https://dl.dropbox.com/u/100084148/Phasing%20antennas.tif The circuit
/rsgb_lf_group-archives/html/rsgb_lf_group/2012-08/msg00374.html (11,863 bytes)

9. Re: LF: GBR is 75 (score: 1)
Author: "Richard Rogers" <>
Date: Tue, 29 May 2001 23:56:12 +1000
For those with an interest in VLF reception please listen to 16kHz (yes 16 not 60kHz!) on Tuesday 29th May 2001 at 1200GMT and 1345GMT." I could just hear GBR. They finished at 1346z with "taking pla
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-05/msg00032.html (8,474 bytes)

10. Re: LF: harmonics / LF antenna (score: 1)
Author: "Richard Rogers" <>
Date: Fri, 11 May 2001 09:10:53 +1000
G'day, Robert, AX2TAR, tried his switch mode LF transmitter without a low pass filter. His 3rd harmonic was just visible on Argo, but his 19th harmonic at about 3.3MHz was S9 here about 10km away. Th
/rsgb_lf_group-archives/html/rsgb_lf_group/2001-05/msg00215.html (10,828 bytes)

11. RE: LF: Spelling of units (score: 1)
Author: "Richard Rogers" <>
Date: Tue, 26 Feb 2002 08:05:39 +1100
A lot of the variations on symbols for units seem to be due to computers; for instance, most CAD and simulation software can't do Greek letters and is not case-sensitive. The Pspice simulator that I
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-02/msg00014.html (11,886 bytes)

12. Re: LF: Jason versions and DDS COntroller (score: 1)
Author: "Richard Rogers" <>
Date: Wed, 23 Oct 2002 18:24:39 +1100
Following the presentation on Data at the HFC, I have been thinking about methods of generating Jason. It seems to me that one of the difficulties is building the transmitter, which either requires a
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-10/msg00151.html (9,921 bytes)

13. Re: LF: MF Challenge (score: 1)
Author: "Richard Rogers" <>
Date: Sun, 10 Aug 2003 07:20:35 +1000
G'day, I saw KFIs carrier last night at Hobart, Tasmania, Australia. A screen shot is at www.qsl.net/vk7ro/640khz.jpg When using an HF dipole antenna the signal was overwhelmed by several "local" sta
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-08/msg00063.html (11,922 bytes)

14. Re: LF: Effect of LP-filter om efficiency (score: 1)
Author: Richard Rogers <>
Date: Wed, 09 Jun 2004 10:51:39 +1000
G'day. Robert, AX2TAR, tried transmitting without a lowpass filter. I live about 15Km from him and could barely hear the 3rd harmonic, but his 19th harmonic at about 3.4MHz was very strong. Presumabl
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-06/msg00036.html (11,712 bytes)

15. Re: LF: ZM2E LF DX aspirations (score: 1)
Author: Richard Rogers <>
Date: Tue, 04 Oct 2005 20:42:02 +1100
G'day all, I saw a trace on 137.7876KHz (+/- .5Hz?) from about 0820z to 0840z on 4 Oct 05. Active vertical, suburbia Hobart, sunset 0819z. At 09:08 PM 10/3/05 +1300, you wrote:  Hi all, sunset and
/rsgb_lf_group-archives/html/rsgb_lf_group/2005-10/msg00225.html (10,385 bytes)

16. LF: VA7LF CW Testing (score: 1)
Author: Richard Rogers <>
Date: Wed, 05 Apr 2006 16:39:07 +1000
via 7RO This is a bulletin from VA7LF located on South Pender Island, B.C. For the next two overnight periods, VA7LF will be attempting to complete a low-frequency QSO with ZM2E in New Zealand. Opera
/rsgb_lf_group-archives/html/rsgb_lf_group/2006-04/msg00227.html (9,582 bytes)

17. Re: LF: Re:Spark (score: 1)
Author: Richard Rogers <>
Date: Wed, 28 Jun 2006 23:20:29 +1000
snipped G'day, 7AA, later VK7DX who died in 1931 from TB (and too many late nights?) : 23rd May 1923 1.48 am VIM de VIA ur spark is not up to tem... VIA de VIM think gap open too much see ltr VIM 2.5
/rsgb_lf_group-archives/html/rsgb_lf_group/2006-06/msg00204.html (9,574 bytes)

18. LF: Harmonics (score: 1)
Author: Richard Rogers <>
Date: Tue, 04 Feb 2014 08:43:12 +1100
G'day, When Robert, AX2TAR, was experimenting here on 178KHz, I built a 100W class D transmitter for him to try. He thought the five element low pass filter on the output was redundant as the antenna
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-02/msg00104.html (9,648 bytes)

19. LF:EWE antenna (score: 1)
Author: Richard Rogers <>
Date: Sat, 19 Apr 2014 07:55:15 +1000
Hello Edgar, I simulated your EWE antenna using EZENEC4 and saw a cardiod pattern with an elevated null to the rear. But I don't have much faith in the results as the ground resistance is unknown. Yo
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-04/msg00024.html (10,446 bytes)

20. Re: LF:EWE antenna (score: 1)
Author: Richard Rogers <>
Date: Sat, 19 Apr 2014 09:01:14 +1000
OK, With a wire joining the bottom ends 10cm above ground and no earth connection, the best front to back seems to be with an 800 ohm resistor. Would you like me to send you some plots? Thank you for
/rsgb_lf_group-archives/html/rsgb_lf_group/2014-04/msg00194.html (10,170 bytes)


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