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1. LF: Re: TC44/MUR1660 question...thanks..... (score: 1)
Author: "Johan Bodin" <>
Date: Wed, 21 Jan 2004 10:20:33 +0100
Hello Dick and the group, there are many MOSFET drivers on the market. Some examples: Maxim MAX626/627/628 www.maxim-ic.com International Rectifier IR21xx / IR21xxx www.irf.com Intersil HIP408x, ICL7
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-01/msg00247.html (11,653 bytes)

2. LF: Historical transmission on 981 kHz (score: 1)
Author: "Johan Bodin" <>
Date: Thu, 15 Jan 2004 15:27:20 +0100
Dear All, Bernt SM6BHZ asked me to send the following information to the LF reflector: Today, January 15, the amateur radio club of Gothenburg (GSA) will transmit a special programme on medium wave t
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-01/msg00248.html (8,571 bytes)

3. LF: Re: WOLF QSO / data modes (score: 1)
Author: "Johan Bodin" <>
Date: Wed, 14 Jan 2004 09:50:42 +0100
Hello all, In case you didn't know, Joe Taylor W1JT won the Nobel prize in physics in 1993: http://www.arrl.org/news/stories/2002/05/14/100/?nc=1 73 Johan SM6LKM
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-01/msg00249.html (8,498 bytes)

4. LF: Improving the signal quality (score: 1)
Author: "Johan Bodin" <>
Date: Thu, 1 Jan 2004 17:37:55 +0100
Gentlemen, you must see this: http://www.j-walk.com/other/wifispray/ Do you think it will work on LF too? :o) 73 Happy New Year Johan SM6LKM
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-01/msg00250.html (8,772 bytes)

5. Re: LF: Re:: Timing GPS (score: 1)
Author: "Johan Bodin" <>
Date: Wed, 18 Feb 2004 17:19:25 +0100
Operation Temperature range: -300C~+700C -300C !? Quite impressive.... =o) 73 Johan SM6LKM
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-02/msg00149.html (10,267 bytes)

6. LF: Re: Schematics powersupplies 50-100Volt wanted (score: 1)
Author: "Johan Bodin" <>
Date: Tue, 3 Feb 2004 09:27:07 +0100
Hello Dick, I want to run something with an fixed voltage between 50 to 100 Volt, depending on what transformer configuration I'm using. The Windows program "PSU Designer II" from Duncan Amps is a ve
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-02/msg00150.html (9,427 bytes)

7. LF: Re: RE: Ionospheric doppler ? (score: 1)
Author: "Johan Bodin" <>
Date: Tue, 9 Mar 2004 14:07:38 +0100
Alberto, Andy is right. Radio clocks keep the receiver turned off most of the time to save battery power. For example, my own alarm clock ("EuroChron") synchronises to DCF77 once per hour. The "radio
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-03/msg00016.html (9,167 bytes)

8. LF: Free filter design program (score: 1)
Author: "Johan Bodin" <>
Date: Mon, 1 Mar 2004 12:56:17 +0100
Hi, I just found that AADE's filter design software has changed from "payware" to freeware. This is a really nice tool for passive filter design. It even does crystal filters! http://www.aade.com/ 73
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-03/msg00257.html (8,846 bytes)

9. LF: Re: VDC source with microvolt resolution (score: 1)
Author: "Johan Bodin" <>
Date: Thu, 13 May 2004 16:43:40 +0100
Hi Alberto, Jim mentioned using a DAC to interpolate between the PWM steps. The interpolation can also be done by "PWMing the PWM" between two adjacent PWM steps (sort of "controlled dithering" :-).
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-05/msg00044.html (9,613 bytes)

10. LF: Re: Re: VDC source with microvolt resolution (score: 1)
Author: "Johan Bodin" <>
Date: Thu, 13 May 2004 22:43:07 +0100
Hi Alberto, It rests to see if the AT90S8535 (you know that, do you ? :-) allows this "change over the nose" of the PWM limits fast enough to be effective. I can't see that as a problem. Timer1 overf
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-05/msg00053.html (10,982 bytes)

11. LF: Re: Audio Amp IC's on 136kHz. (score: 1)
Author: "Johan Bodin" <>
Date: Sun, 30 May 2004 12:48:23 +0100
Hi David, A switching amplifier with modulated supply should also be able to do the trick. At 15 watts, a single transistor class E amplifier comes to my mind. For example, the modulation can be made
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-05/msg00097.html (8,814 bytes)

12. LF: Re: Effect of LP-filter om efficiency (long) (score: 1)
Author: "Johan Bodin" <>
Date: Tue, 08 Jun 2004 13:53:42 +0100
Dick, you are absolutely right that a "voltage switching" class D amplifier should not be followed by a lowpass filter with shunt C input as this will result in huge current spikes. There are two maj
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-06/msg00032.html (14,052 bytes)

13. LF: Re: Effect of LP-filter om efficiency (shorter...) (score: 1)
Author: "Johan Bodin" <>
Date: Tue, 08 Jun 2004 15:10:21 +0100
Dick, just a few more comments, So it seems to me that class D and E amplifiers should preferably be followed by a low pass filter with a series inductor at the transmitter side. In the case of volta
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-06/msg00034.html (10,256 bytes)

14. LF: Re: Re: Effect of LP-filter om efficiency (correction) (score: 1)
Author: "Johan Bodin" <>
Date: Wed, 09 Jun 2004 13:16:52 +0100
Nathan Sokal WA1HQC has written a very good article about class E design. The article sokal.zip (zipped PDF) can be found on this page: http://mywebpages.comcast.net/tonne/classe.html Jim Tonnes cla
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-06/msg00039.html (9,721 bytes)

15. LF: UNESCO declares SAQ as a World Heritage (score: 1)
Author: "Johan Bodin" <>
Date: Sun, 04 Jul 2004 22:04:30 +0100
Dear LF enthusiasts Today, UNESCO declared the radio station SAQ in Grimeton, Sweden, as a world heritage! http://whc.unesco.org/pg.cfm?cid=31&id_site=1134 http://www.alexander.n.se/ (most info' unfo
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-07/msg00007.html (9,920 bytes)

16. LF: Re: Re: UNESCO declares SAQ as a World Heritage (score: 1)
Author: "Johan Bodin" <>
Date: Mon, 05 Jul 2004 20:16:59 +0100
Unfortunately your reminder was 12 hours too late. I could kick myself for forgetting it was today having heard SAQ for several years past. I'm sorry Bryan. I posted the message on July 2:nd so I bl
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-07/msg00012.html (10,308 bytes)

17. LF: Re: Re: UNESCO declares SAQ as a World Heritage (score: 1)
Author: "Johan Bodin" <>
Date: Tue, 06 Jul 2004 14:49:44 +0100
Hi Alberto, received your message twice... I only got it once, the delayed version. Some space-time anomaly, undoubtedly, with a warping effect... Sure. I will be very scared the day I receive a refl
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-07/msg00033.html (10,922 bytes)

18. LF: Re: Ant test (score: 1)
Author: "Johan Bodin" <>
Date: Fri, 23 Jul 2004 13:03:59 +0100
Hej Bernt, I just running a test transmission on 135,995 kHz 40mW ERP. 40mW!? 599+ on a piece of wire in the shack! BHZ <-- ~80km--> LKM 73 Johan SM6LKM
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-07/msg00185.html (8,209 bytes)

19. Re: LF: QRSS origin (score: 1)
Author: "Johan Bodin" <>
Date: Thu, 19 Aug 2004 13:14:46 +0100
P.S. Isn't the parsec a measure of space and not of time ? Yes, 1 parsec = 3.0857E16 meters = 3.262 lightyears. 73 Johan SM6LKM
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-08/msg00198.html (9,172 bytes)

20. LF: Fw: International longwave meeting Summer 2005 in Sweden (incl World Heritage Grimeton)? (score: 1)
Author: "Johan Bodin" <>
Date: Wed, 08 Sep 2004 13:23:32 +0100
For your information. 73 de Johan SM6LKM --Ursprungligt meddelande-- Från: Svensson Winnie [mailto:] Skickat: den 7 september 2004 08:10 Till: [....] Ämne: VB: Interna
/rsgb_lf_group-archives/html/rsgb_lf_group/2004-09/msg00036.html (14,794 bytes)


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