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101. Re: LF: Today's soldering (score: 1)
Author: DK7FC <[email protected]>
Date: Wed, 15 Jul 2015 14:16:42 +0200
Yes, there's a JFET on the other side. So far a BF245A. It works well. But the circuit consumes 3.5 mA. I thought it could be less. It is running at 5V DC and the xtal frequency is 1.8432 MHz. I loo
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00075.html (13,285 bytes)

102. Re: LF: Today's soldering (score: 1)
Author: DK7FC <[email protected]>
Date: Wed, 15 Jul 2015 16:18:31 +0200
Am 15.07.2015 15:00, schrieb Andy Talbot: Assume you've tried putting an R||C in the source to bias the BF245 back a bit and still ensure oscillation? Yes, probably during you wrote that mail i have
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00077.html (12,827 bytes)

103. Re: VLF: Tweek mode resonances (score: 1)
Author: DK7FC <[email protected]>
Date: Sat, 18 Jul 2015 10:51:49 +0200
Hello Markus, Thanks for your observation and article! :-) Most interesting. I can indeed confirm there were a number of cloud-cloud lightnings last night, up to 20 per minute were visible at times.
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00079.html (15,019 bytes)

104. Re: VLF: Tweek mode resonances (score: 1)
Author: DK7FC <[email protected]>
Date: Sun, 19 Jul 2015 17:32:24 +0200
Hi Markus, Let's see what is possible. I'm trying to ground the far end of the inv-L to form a vertical loop. I guess that 20 A will be no problem at all but 100 A sound quite optimistic :-) Here is
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00084.html (21,400 bytes)

105. LF: MF diurnal noise background (score: 1)
Author: DK7FC <[email protected]>
Date: Tue, 21 Jul 2015 10:42:45 +0200
Hi all, Yesterday the conds on MF were very good, low QRN levels and good propagation. On my remote grabber i'm running a slow scrolling spectrogram showing the whole 630m band over the last 20 hours
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00094.html (10,107 bytes)

106. Re: VLF: Tweek mode resonances (score: 1)
Author: DK7FC <[email protected]>
Date: Tue, 21 Jul 2015 21:50:01 +0200
Hello Markus, VLF, A few minutes ago i've grounded the far end of my antenna with a massive wire. This would handle 100 A :-) See https://dl.dropboxusercontent.com/u/19882028/VLF/20150721_211722.jpg
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00096.html (21,609 bytes)

107. Re: VLF: Tweek mode resonances (score: 1)
Author: DK7FC <[email protected]>
Date: Tue, 21 Jul 2015 23:31:47 +0200
Hi VLF, Now i continued with measurements of the new loop. I took 3 different capacitors in series and searched for the maximum antenna current for a fundamental frequency. I had and have no idea abo
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00097.html (23,144 bytes)

108. Re: VLF: Tweek mode resonances (score: 1)
Author: DK7FC <[email protected]>
Date: Tue, 21 Jul 2015 23:49:25 +0200
Markus, Am 18.07.2015 06:50, schrieb Markus Vester: The screenshot http://df6nm.bplaced.net/VLF/spherics/dk7fc_VLF_150718_1326.jpg shows a number of narrow tweek-mode resonances at multiples of 1.72
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00098.html (11,721 bytes)

109. Re: VLF: Tweek mode resonances (score: 1)
Author: DK7FC <[email protected]>
Date: Thu, 23 Jul 2015 00:10:55 +0200
Hi VLF, Today I've built a transformer to match the antenna to the PA. This is not the ideal solution for QRO / highest antenna currents but i like to idea of a galvanically decoupled antenna and TX.
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00109.html (24,309 bytes)

110. Re: LF: F6CNI to night testing a tuned loop TX on MF (score: 1)
Author: DK7FC <[email protected]>
Date: Tue, 28 Jul 2015 00:03:38 +0200
Hello Andy, How is this possible? Your Loop points to SE, my loop also points to SE. But we are not in one line. Actually it would be best for us if our loops would point to NE. But i can receive you
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-07/msg00135.html (13,140 bytes)

111. Re: LF: Activity Day, Sun 9 Aug (score: 1)
Author: DK7FC <[email protected]>
Date: Fri, 07 Aug 2015 22:12:09 +0200
Hi all, I had to spend 8 days in the hospital but now i'm back here and on the band(s). I removed the short-circuit on the far end of the antenna, i.e. switched back from loop to inv-L so i can take
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00026.html (15,606 bytes)

112. Re: VLF: Tweek mode resonances (score: 1)
Author: DK7FC <[email protected]>
Date: Fri, 07 Aug 2015 23:02:05 +0200
Just FYI, i found that there was a certain correlation between transmitting and the arrival of the fire brigade (EMC issues)! When using a (linear) audio amp, nothing happend but the currents are sma
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00031.html (23,880 bytes)

113. Re: LF: Activity Day, Sun 9 Aug (score: 1)
Author: DK7FC <[email protected]>
Date: Sat, 08 Aug 2015 21:40:42 +0200
Hi Roman, Uuh, sounds good! I will be there, it's time to heat the LF coil! 73, Stefan Am 08.08.2015 19:27, schrieb Roman: GD Genossen LFers! Russian informed abt Activity Day: http://136.su/index.ph
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00042.html (14,537 bytes)

114. Re: LF: VE3EAR receive WSPR-2 (score: 1)
Author: DK7FC <[email protected]>
Date: Sun, 09 Aug 2015 01:00:57 +0200
Hello Bruce, Soon the sunset will be on your side. There are a few stations active. Condx seem to be rather poor. What about TX stations on your side? It would be nice to have a RX-challenge :-) 73,
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00044.html (9,082 bytes)

115. Re: LF: Activity Day, Sun 9 Aug (score: 1)
Author: DK7FC <[email protected]>
Date: Sun, 09 Aug 2015 12:26:09 +0200
Hi all, I'll give it a try in CW soon. Later then in DFCW. Hope the RIG is still running... 73, Stefan Am 09.08.2015 12:19, schrieb DK1IS: Hello Mike, it seems today we canīt make it directly in real
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00061.html (11,696 bytes)

116. Re: LF: Protecting a MOSFET driver chip from MOSFET failure? (score: 1)
Author: DK7FC <[email protected]>
Date: Mon, 10 Aug 2015 14:34:18 +0200
Am 10.08.2015 14:09, schrieb Chris Wilson: 10 August 2015 Is there a way of protecting a typical MOSFET driver IC from being taken out by a MOSFET failure in a Class E LF amp? Hi Chris, It can be hel
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00090.html (10,710 bytes)

117. Re: LF: Activity Day 136kHz summary (score: 1)
Author: DK7FC <[email protected]>
Date: Mon, 10 Aug 2015 14:41:42 +0200
I agree, it was a very goof idea to make this activity day and it was a big fun. A pity that we don't use the LF band more often. We should try more activity days, in shorter intervalls :-) I want to
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00091.html (10,247 bytes)

118. LF: 5V DC/DC modules for LF/MF (score: 1)
Author: DK7FC <[email protected]>
Date: Thu, 13 Aug 2015 16:30:13 +0200
Hi all, My remote MF system is down at the moment, for doing some upgrades and improvements. I'm replacing a DC/DC converter which supplies the Raspi with a constant 5V voltage. So far i used a LM259
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00112.html (10,705 bytes)

119. LF: DL1HTY (score: 1)
Author: DK7FC <[email protected]>
Date: Fri, 14 Aug 2015 18:00:38 +0200
Hi MF, Last weekend there was some activity by DL1HTY on 630m. They were active /p. I didn't expect so much from what they said before the activity but then i even worked them is CW. They had a relat
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00118.html (8,815 bytes)

120. LF: Some LF again (score: 1)
Author: DK7FC <[email protected]>
Date: Sat, 15 Aug 2015 19:18:53 +0200
Hi LF, I'm back there is WSPR-15 for some time. The power is reduced by 4 dB, unfortunately. Maybe someone can catch a trace anyway :-) 73, Stefan/DK7FC
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-08/msg00128.html (8,891 bytes)


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