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101. VLF: DK7FCs 5th VLF experiment... (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Sat, 15 May 2010 14:25:17 +0200
Dear group, I is a long time ago that i have done the last experiment. Tomorrow, the WX could be suitable and i have time and motivation to try the next experiment on 8,97 kHz. But the WX is a little
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00178.html (11,745 bytes)

102. Re: LF: 8.97kc - TV transformer info needed (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Mon, 31 May 2010 17:13:34 +0200
Hi Mike, Just count the number of turns you used and multiply the number by 0.65. This is the new number of turns. Or, remove 35% of the turns ;-) 73, Stefan Am 31.05.2010 17:02, schrieb Mike.WE0H: H
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00185.html (12,320 bytes)

103. Re: LF: Alpha dashes (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Thu, 20 May 2010 15:43:21 +0200
Tnx Mal. Dont't you want to be one of those amateurs as well? You could surely become one of the TXing group as well! Stefan/DK7FC Am 20.05.2010 15:08, schrieb mal hamilton: Stefan You are doing well
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00195.html (11,356 bytes)

104. VLF: Outdoor test for different places for active E-field antennas for VLF (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Thu, 13 May 2010 20:48:13 +0200
Dear group, Today i checked 3 different places for my VLF grabber antenna. The currently used antenna was not touched. I used a second antenna that uses a fiber optic cable + battery that totally dec
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00207.html (12,109 bytes)

105. Re: LF: Re: DK7FCs 5th VLF experiment... (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Wed, 19 May 2010 11:20:07 +0200
Hello Jim, Aah, ok. Well, i haven't done this test. As usual, i took all the time to transmit although i wanted to prepare that test. The QRN level was to high and Markus told me that he is not visib
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00210.html (13,412 bytes)

106. Re: LF: RE: 8,97 kHz active antenna circuit and pictures (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Tue, 11 May 2010 12:04:16 +0200
Hello Horst, VLF, Am 11.05.2010 10:45, schrieb Horst Stöcker: TV Transformer, interesting. I think it should work well on lower distance. QRP on 9kHz, hi. I also had this idea after my first tests on
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00237.html (13,996 bytes)

107. Re: VLF: Clipping or blanking?? (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Fri, 21 May 2010 00:15:20 +0200
Hello Peter, Indeed, there was something wrong arround 24 kHz. Now i have switched to my /p USB soundcard (that contains its own driver). Now, DHO is available :-) Additionally there is a button that
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00256.html (14,523 bytes)

108. Re: LF: VLF propagation (continued..) (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Thu, 06 May 2010 10:06:11 +0200
Hi Piotr, Wow, that are really interesting simulation results. Mni tnx! You have partly answered the questions i just asked Paul ;-) So, if possible, i will try to transmit even lower :-) It is some
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00259.html (12,123 bytes)

109. Re: VLF: Activity (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Thu, 06 May 2010 09:47:44 +0200
Thank you Paul. BTW, my special permission for a 300m kite vertical becomes more probably in the last time. Maybe i will get it in the summer, what is not optimal. But in that time i can make several
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00279.html (11,392 bytes)

110. Re: LF: Dreamer RX (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Thu, 13 May 2010 14:19:18 +0200
Hi Laurence, Am 12.05.2010 22:10, schrieb Laurence KL1X: Im waiting for a day when its safe to stand in an open field and not become part of a damped tuned circuit! But Im happy with my 9Khz rx syste
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00300.html (10,890 bytes)

111. Re: LF: RE: Re: RE: Dreamer RX (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Thu, 13 May 2010 14:17:20 +0200
Hello Jim, Nice to see that TX stations coming up in the UK!! I watch this with interest and am dreaming about a QSO, even if it will take hours ;-) The "dx window" becomes smaller, about 3 hours (6
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00315.html (14,897 bytes)

112. Re: LF: Re: TV transformer (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Sat, 15 May 2010 13:46:18 +0200
Mal, It is used in my test antenna, for local tests. I tried to reach my grabber out of a distance of 1,1km (home QTH to work QTH). Generally this is a method to become on air for a first step but is
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00329.html (11,793 bytes)

113. VLF: QRSS-6000 transmitter test window (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Fri, 07 May 2010 15:19:05 +0200
Dear LF/VLF, Since yesterday i have added a "QRSS-6000 transmitter test window" on my grabber. It is on the bottom of the page. 1 Pixel is 40 minutes long. Above, there is the ALPHA beacon on 11904,7
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00343.html (11,453 bytes)

114. Re: VLF: Clipping or blanking?? (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Thu, 20 May 2010 16:49:09 +0200
Peter, Ok, but it could be a IM with another signal?! Because i know that the sample rate is 48000 and it is successfully locked to GBZ. Additionally the main IM product, 9 kHz (due to strong LF broa
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00417.html (12,955 bytes)

115. LF: GPS frequency locking (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Wed, 12 May 2010 17:42:53 +0200
Dear group, Can anyone help me with a GPS receiver i want to use for frequency locking? Just before 2 minutes i got a GPS hand held device. It is at least 8 years old. It is a "Magellan Blazer 12". C
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00445.html (11,838 bytes)

116. Re: VLF: Clipping or blanking?? (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Thu, 20 May 2010 18:20:55 +0200
...additionally i even added a 8th window. It seems to look like a childish game what i am doing here but it helps me much, understanding to see how the clipper acts and so on. I just want to share t
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00450.html (12,368 bytes)

117. Re: LF: Re: Clipping or blanking/9kHz intermods (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Sat, 22 May 2010 12:37:29 +0200
Hello Peter, VLF, Am 22.05.2010 11:33, schrieb pws: Stefan, you are observing well known sunrise/-set effects and your monitor works fine now. I rather think that the amplifiers gain is now much more
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00455.html (13,546 bytes)

118. Re: LF: Alpha signal (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Wed, 19 May 2010 11:47:14 +0200
Hello Marco, You still can see on the grabber that it was switched out on saturday night until now. There is 3 hours time difference to UTC so it is switched out at 21UT. This happens each few weeks.
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00464.html (9,397 bytes)

119. Re: LF: Re: DK7FCs 5th VLF experiment... (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Tue, 18 May 2010 12:56:41 +0200
Hello Jim, Am 16.05.2010 18:20, schrieb James Moritz: So a negative result here this time, although I see signals were visible at DF6NM and DL4YHF - how was reception on the vertical antenna? Cheers,
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00485.html (12,225 bytes)

120. Re: LF: ref LD30 (score: 1)
Author: Stefan Schäfer <[email protected]>
Date: Sat, 15 May 2010 13:52:59 +0200
Mal, I assume you know your antenna capacitance so you can easily calculate your needed inductance. Or, if you know your L for 137kHz, it will be about (137/9)^2 at 9 kHz! Stefan/DK7FC Am 14.05.2010
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00486.html (10,801 bytes)


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