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121. Re: [rsgb_lf_group] RE: Cheap and nasty sources - was LF: DK7FC WSPR bad quality problem (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Tue, 29 Mar 2016 18:20:05 +0200
A modern PIC like the dsPIC33EP32GS202 (which I am currently playing with) can possibly be used for that purpose. It has a multiple high-speed PWM outputs which can be programmed for periods and puls
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-03/msg00370.html (50,383 bytes)

122. LF: Re: [rsgb_lf_group] Fast Serial Interfacing with PICs (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Thu, 7 Apr 2016 22:49:33 +0200
Hi Andy, It was me, using a PIC16F1783 with 1 MBaud on an FTDI-based interface. At higher bitrates, there were occasionally lost samples depending on the CPU load of the PC. So it wasn't a problem wi
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00073.html (14,072 bytes)

123. Re: LF: Weaver Modulator with Spectrum Lab (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Thu, 14 Apr 2016 19:27:57 +0200
Hi Warren, It's not strictly the Weaver method but there is an SSB 'up-converter' with I and Q outputs in SL. It actually uses a forward and inverse FFT, and cos^2 windowing (with 50 percent overlap)
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00177.html (9,993 bytes)

124. Re: LF: Weaver Modulator with Spectrum Lab (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Thu, 14 Apr 2016 20:29:38 +0200
Well the main purpose of the filter is filtering. Letting it produce an I/Q output is more or less a by-product, and it works extremely well. Am 14.04.2016 um 19:54 schrieb Andy Talbot: That seems a
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00179.html (9,909 bytes)

125. Re: LF: sending EbNaut with SL on 137485.00 Hz (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sat, 16 Apr 2016 17:44:35 +0200
Hi Domenico, It's important to turn off 'differential encoding' in the digimode terminal. Most PSK-modes have that option set by default, but for Ebnaut it must be cleared. When you set the symbol ra
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00208.html (13,754 bytes)

126. Re: VLF: EbNaut transmission on 8270.005 Hz (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Tue, 26 Apr 2016 22:47:35 +0200
Ummh.. why am I thinking about Sesame Street now ? http://www.amazon.de/Butlers-BUTLERS-ZINC-M%C3%BClltonne-Oskar/dp/B006IFQW5S/ref=sr_1_1?ie=UTF8&qid=1461530074&sr=8-1&keywords=m%C3%BClltonne+metall
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00331.html (10,616 bytes)

127. Re: VLF: A single turn RX loop for VLF (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Wed, 27 Apr 2016 19:11:55 +0200
Hello all, I can confirm such a single-turn loop with a big ferrite transformer works well - even with a very simple amplifier. Construction details and a few spectrograms at : http://www.qsl.net/dl4
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00340.html (15,650 bytes)

128. Re: LF: A transductor instead of a traditional variometer on VLF/LF/MF? Done! (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sun, 15 May 2016 14:12:49 +0200
Greetings all, Interesting application .. but wouldn't the operation of such a simple transductor (wound on a single ferrite core) depend a lot on the 'RF drive' itself, and / or have different influ
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-05/msg00120.html (19,078 bytes)

129. Re: LF: A transductor instead of a traditional variometer on VLF/LF/MF? Done! (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Mon, 16 May 2016 11:20:02 +0200
Hi Tom, Ah, i see.. thanks, I missed that on the photo ... so there won't be kilovolts of AC on the DC exciation coil. Or, depending on how the ring core is oriented in the "mostly air core" coil, th
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-05/msg00134.html (12,946 bytes)

130. Re: LF: Test (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sat, 28 May 2016 14:34:37 +0200
roger 2-7 roger 2-7 roger 2-7 .... :) Am 28.05.2016 um 13:45 schrieb Mal Hamilton: Test27 G3KEV
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-05/msg00211.html (9,706 bytes)

131. Re: LF: SDR-Play and Spectrum Laboratory (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Mon, 30 May 2016 20:47:54 +0200
Hello Dave, By coincidence, one of the developers of SDR-play recently asked me if I'd like to have one of these devices to add support for it. Since I cannot devote lots of time for it, my suggestio
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-05/msg00234.html (11,510 bytes)

132. Re: LF: SDR-Play and Spectrum Laboratory (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Mon, 30 May 2016 21:23:35 +0200
Hello Tobias, Dave, and the group, Great, thanks Tobias - in that case, Dave doesn't need to fool around with virtual audio cables etc. After installing the ExtIO-interface, you can select ("install"
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-05/msg00237.html (13,259 bytes)

133. Re: LF: EbNaut beaconing on LF from JN80 (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Sat, 4 Jun 2016 17:16:55 +0200
Hello Stefan, Michel and all, In fact the 'EbNaut recorder' configuration doesn't use the FFT for decimation. But it uses the same class of pre-processing to decimate the sampling rate for the record
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-06/msg00020.html (16,029 bytes)

134. Re: LF: LF PSK31 (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Wed, 20 Jul 2016 21:31:36 +0200
Greetings all, PSK31 is technically speaking BPSK. But G3PLX doesn't like that name (as he once explained to me, long ago) because there is only "one real PSK31". Ok, there is an experimental QPSK31
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-07/msg00102.html (15,704 bytes)

135. Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2 (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Mon, 24 Oct 2016 22:07:30 +0200
Hello Jim, I still wonder why the sync pulses from the Thunderbolt E are so short - you mentioned 10 us in your email, but what is the exact pulse length ? With a slightly modified software (SL) it m
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-10/msg00306.html (23,828 bytes)

136. Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2 (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Tue, 25 Oct 2016 12:21:43 +0200
Hi Chris, Whow, that's a nice "mass grave" of logic ICs ! - yes of course, you can use the 1 Hz output. If it has a 50 % duty cycle, it will look just like a 500 ms long sync pulse to the software. I
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-10/msg00317.html (15,433 bytes)

137. Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2 (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Tue, 25 Oct 2016 12:40:01 +0200
Hello Jim, Ok thanks for the details. The reason why the Trimble's "Dirac-like" sync pulse didn't work with SL is because SL expects a 'nice' rectangular pulse. It needs that to find out if the sound
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-10/msg00318.html (33,856 bytes)

138. Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2 (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Tue, 25 Oct 2016 12:52:47 +0200
It will possibly work if the software (SL) would not expect a 'normal' rectangular pulse, look for the "valid" low->high transition (because some cards have the bad habit of inverting the polarity),
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-10/msg00319.html (16,344 bytes)

139. Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2 (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Tue, 25 Oct 2016 14:54:07 +0200
Hello Bill, Nice to hear from you again. Indeed it's a good point, if the GPS isn't only used for frequency calibration but also for absolute timing. I looked at Paul Nicholson's principle of centroi
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-10/msg00324.html (15,612 bytes)

140. Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2 (score: 1)
Author: Wolfgang Büscher <[email protected]>
Date: Wed, 26 Oct 2016 23:46:28 +0200
Hello Jim, I wouldn't give up on the Thunderbolt E yet. A double-ovenned 10 MHz sounds intriguing, you should have a very low phase noise which other GPSes (clocked by a cheap 'computer grade' oscill
/rsgb_lf_group-archives/html/rsgb_lf_group/2016-10/msg00353.html (14,085 bytes)


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