Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id wANEJ72D014948 for ; Fri, 23 Nov 2018 15:19:13 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gQCCH-0008Dr-LP for rs_out_1@blacksheep.org; Fri, 23 Nov 2018 14:12:41 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gQCCH-0008Di-78 for rsgb_lf_group@blacksheep.org; Fri, 23 Nov 2018 14:12:41 +0000 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1gQCCB-0000hU-47 for rsgb_lf_group@blacksheep.org; Fri, 23 Nov 2018 14:12:40 +0000 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id 9B99216005D for ; Fri, 23 Nov 2018 15:12:33 +0100 (CET) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1542982353; bh=oEy5j1hl43q5aLZ8Hgz33yfssY7pvU3guEinNXA47ps=; h=Date:From:To:Subject:From; b=m6+Ub3wxNmEup/yczZzrwgike7NZO4FFWJ1+NWme2h6DgLJrNp1ikg+8hiIXKyq5h x1HliyzUuHAWyPDvxUaxYFAWE4CEgKoc4gw8L7VTHemQeYMJO5//TONZNPR+vx/62e aBLPr6D+WsA5oJ3ASJaCxC1EH2mXX2iO7vjoDqDdehdQNcmEGxRxA0wCXPF6u0FsZi vUlzLlWTeyDGNYKIL4hDBz+5zy3HrcJy9dc2p4eBMsv17qOMEwR5lVfFlVP352UYiG XuQEiQZ8JMhadsDz7ydqhZSEc39KIm7rdDCypDofNWLIAqB5YPYidaxoWNWCpUhsij sPvRyE37awVkw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 431dYX6NMrz6tmB for ; Fri, 23 Nov 2018 15:12:30 +0100 (CET) Message-ID: <5BF80ACE.2040904@posteo.de> Date: Fri, 23 Nov 2018 15:12:30 +0100 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <5BE0C0CE.10008@posteo.de> <5BE19D5E.7000408@posteo.de> <5BF7C6B4.8090104@posteo.de> <6DB8451D7F3D3947A5918808A59621EA14E215A9@servigilant.vigilant.local> In-Reply-To: <6DB8451D7F3D3947A5918808A59621EA14E215A9@servigilant.vigilant.local> X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Hi Luis, Well, some PA designs using ferrite input transformers will have problems at that frequency. But i built that H bridge for the guide rail antenna experiments in a way that it can work down to ELF, i.e [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.65 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_KAM_HTML_FONT_INVALID BODY: Test for Invalidly Named or Formatted Colors in HTML 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 0.0 DC_PNG_UNO_LARGO Message contains a single large png image X-Scan-Signature: 59dfa31c87e93cf4a32c8e0c1ddc303c Subject: Re: LF: RE: Carrier transmission at 80 Hz Content-Type: multipart/mixed; boundary="------------030602030703010405010604" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false This is a multi-part message in MIME format. --------------030602030703010405010604 Content-Type: multipart/alternative; boundary="------------010500060409030802080504" --------------010500060409030802080504 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Luis, Well, some PA designs using ferrite input transformers will have problems at that frequency. But i built that H bridge for the guide rail antenna experiments in a way that it can work down to ELF, i.e. < 30 Hz. It simply uses IR2110 half bridge drivers. I'm also using this PA in this experiment. So the output voltage is a rectangle. The transformer would handle a rectangle but quite a high input voltage is needed. However, if you use a capacitor in series to the primary winding you series-resonate the complete RLC network where the antenna is one part. This is what i have done. With the 470 pF on the output of the transformer i need about 20 uF for that. Then the output voltage is a very well looking sine wave. And, just 8 V DC (and abt 1.2 A) is needed for the bridge supply voltage to reach 5 kV rms at the output. Oh BTW regarding crazy, last night was very cold (< 0 C), clear, the moon was fully shining. I took the scope on the top of the building. With a 1:1000 HV probe i measured the voltage directly across the antenna. It is all a great fun and moments to think back in some time. Let me attach another small png file showing the voltage across the wire :-) These oil ignition transformers are very fine and become rare! I had 3 of them but meanwhile they are all damaged :-( Tom DK1IS seems to operate with them at the moment but he will report later i think. However these types of transformers are designed to be run just for a minute or so, then you have to let them cool down. I don't think they will handle the high voltage 24/7, even if nearly no output power is token. Just measure the input current during normal operation (with a continous arc on the secondary side) and then without an arc. I would assume that the difference is only a factor 2 or so and the cos phi will be quite resistive, i.e. it will heat up after less than a hour i guess. But maybe i'm wrong. You have that remote RX location in 7 km, right? That may be ideal for such experiments. 73, Stefan Am 23.11.2018 14:06, schrieb VIGILANT Luis Fernández: > > Hi XLF > > Great stuff Stefan. I save it to show to a neighbour, just in case > they say I'm crazy ;-) > > I assume you are not using a resonant antenna at 80Hz, right ? > > So, no coil. Just the inverted L element and ground at the HV > transformer secondary ? > > Mmmm. I have a similar device around which was the spark generator of > an oil heating boiler > > Wait for you at DC > > 73 de Luis > > EA5DOM > > *De:* owner-rsgb_lf_group@blacksheep.org > [mailto:owner-rsgb_lf_group@blacksheep.org] *En nombre de *DK7FC > *Enviado el:* viernes, 23 de noviembre de 2018 10:22 > *Para:* rsgb_lf_group@blacksheep.org > *Asunto:* SLF: Carrier transmission at 80 Hz > > Dear SLF friends, > > A new step forward towards DC: Since yesterday 22:30 UTC i'm TXing a > carrier at * 80.005 Hz*. That's the *3750 km band*, where the far > field begins at a distance of 598 km. > > The antenna voltage is just 5 kV and i'm getting 1.2 mA antenna > current, giving an *ERP of 20 fW* (2E-14 W). > > The voltage is even higher than in my recent experiment on 270 Hz, > anyway the S/N is lower, indicating that my RX lacks of sensitivity. > Indeed this experiment helps to estimate the lack of sensitivity. > Looks like i'm missing about 10 dB on that frequency. Anyway the > signal is making the path of 3.5 km to my tree grabber, as usual shown > at > http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html. > Not a big distance but still well beyond most garden fences! > The signal leaves a barely visible trace in the ZEVS window which is > running at 3.8 mHz FFT bin witdh. Unfortunately ZEVS is off the air > since a week or so. actually i wanted to transmit side by side with > ZEVS, of course a bit deeper even. > > From a quiet period at night, i calculated the SNR of a 1 hour carrier > period using vlfrx-tools: carrier *S/N: 16.83 dB in 277.8 uHz*, -18.73 > dB in 1Hz > > For the crazy homebrewers i'd like to share that website where i > ordered the HV-transformer, > http://www.hosin.de/Specials/HV-Trafo/hv-trafo.html A nightmare for > all safety-fetishists! For the completeness it must be mentioned > together with that page: http://kurts-werkstatt.de/hv-trafo.htm > > 73, Stefan > --------------010500060409030802080504 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Luis,

Well, some PA designs using ferrite input transformers will have problems at that frequency. But i built that H bridge for the guide rail antenna experiments in a way that it can work down to ELF, i.e. < 30 Hz. It simply uses IR2110 half bridge drivers. I'm also using this PA in this experiment. So the output voltage is a rectangle. The transformer would handle a rectangle but quite a high input voltage is needed. However, if you use a capacitor in series to the primary winding you series-resonate the complete RLC network where the antenna is one part. This is what i have done. With the 470 pF on the output of the transformer i need about 20 uF for that. Then the output voltage is a very well looking sine wave. And, just 8 V DC (and abt 1.2 A) is needed for the bridge supply voltage to reach 5 kV rms at the output.

Oh BTW regarding crazy, last night was very cold (< 0 C), clear, the moon was fully shining. I took the scope on the top of the building. With a 1:1000 HV probe i measured the voltage directly across the antenna. It is all a great fun and moments to think back in some time.
Let me attach another small png file showing the voltage across the wire :-)

These oil ignition transformers are very fine and become rare! I had 3 of them but meanwhile they are all damaged :-( Tom DK1IS seems to operate with them at the moment but he will report later i think.
However these types of transformers are designed to be run just for a minute or so, then you have to let them cool down. I don't think they will handle the high voltage 24/7, even if nearly no output power is token.
Just measure the input current during normal operation (with a continous arc on the secondary side) and then without an arc. I would assume that the difference is only a factor 2 or so and the cos phi will be quite resistive, i.e. it will heat up after less than a hour i guess. But maybe i'm wrong.
You have that remote RX location in 7 km, right? That may be ideal for such experiments.

73, Stefan


Am 23.11.2018 14:06, schrieb VIGILANT Luis Fernández:

Hi XLF

 

Great stuff Stefan. I save it to show to a neighbour, just in case they say I’m crazy ;-)

 

I assume you are not using a resonant antenna at 80Hz, right ?

So, no coil. Just the inverted L element and ground at the HV transformer secondary ?

 

Mmmm. I have a similar device around which was the spark generator of an oil heating boiler

 

Wait for you at DC

 

73 de Luis

EA5DOM

 

De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: viernes, 23 de noviembre de 2018 10:22
Para: rsgb_lf_group@blacksheep.org
Asunto: SLF: Carrier transmission at 80 Hz

 

Dear SLF friends,

A new step forward towards DC: Since yesterday 22:30 UTC i'm TXing a carrier at 80.005 Hz. That's the 3750 km band, where the far field begins at a distance of 598 km.

The antenna voltage is just 5 kV and i'm getting 1.2 mA antenna current, giving an ERP of  20 fW (2E-14 W).

The voltage is even higher than in my recent experiment on 270 Hz, anyway the S/N is lower, indicating that my RX lacks of sensitivity. Indeed this experiment helps to estimate the lack of sensitivity. Looks like i'm missing about 10 dB on that frequency. Anyway the signal is making the path of 3.5 km to my tree grabber, as usual shown at http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html. Not a big distance but still well beyond most garden fences!
The signal leaves a barely visible trace in the ZEVS window which is running at 3.8 mHz FFT bin witdh. Unfortunately ZEVS is off the air since a week or so. actually i wanted to transmit side by side with ZEVS, of course a bit deeper even.

>From a quiet period at night, i calculated the SNR of a 1 hour carrier period using vlfrx-tools: carrier S/N: 16.83 dB in 277.8 uHz, -18.73 dB in 1Hz

For the crazy homebrewers i'd like to share that website where i ordered the HV-transformer, http://www.hosin.de/Specials/HV-Trafo/hv-trafo.html A nightmare for all safety-fetishists! For the completeness it must be mentioned together with that page: http://kurts-werkstatt.de/hv-trafo.htm

73, Stefan

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