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 wAOB9K9H020928 for ; Sat, 24 Nov 2018 12:09:26 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gQVja-0006Pg-GP for rs_out_1@blacksheep.org; Sat, 24 Nov 2018 11:04:22 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gQVjZ-0006PX-Na for rsgb_lf_group@blacksheep.org; Sat, 24 Nov 2018 11:04:21 +0000 Received: from smtp2web.tin.it ([212.216.176.236]) by relay1.thorcom.net with esmtp (Exim 4.91_59-0488984) (envelope-from ) id 1gQVjW-0003mA-Jn for rsgb_lf_group@blacksheep.org; Sat, 24 Nov 2018 11:04:20 +0000 Received: from feu23 (10.192.64.33) by smtp2web.tin.it (8.6.060.43) id 5B27C1730432F366 for rsgb_lf_group@blacksheep.org; Sat, 24 Nov 2018 12:04:16 +0100 Received: from (95.249.73.43) by webmailtin.pc.tim.it; Sat, 24 Nov 2018 12:04:16 +0100 Message-ID: <16745643c4d.marcocadeddu@tin.it> Date: Sat, 24 Nov 2018 12:04:16 +0100 (CET) From: "marcocadeddu@tin.it" To: Mime-Version: 1.0 X-Originating-IP: 95.249.73.43:1133 X-Spam-Score: 1.0 (+) 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 Markus, are you meaning DC as direct current or District of Columbia? :-)) have a nice weekend MF / LF fellows! Content analysis details: (1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.216.176.236 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (marcocadeddu[at]tin.it) 0.0 HTML_MESSAGE BODY: HTML included in message 1.0 FREEMAIL_REPLYTO Reply-To/From or Reply-To/body contain different freemails X-Scan-Signature: 92b6515a4252c45136e975e6745a1e0d Subject: R: Re: R: SLF: Carrier transmission at 80 Hz Content-Type: multipart/alternative; boundary="----=_Part_12348_21837319.1543057456208" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=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 ------=_Part_12348_21837319.1543057456208 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Markus, are you meaning DC as direct current or District of Columbia? :-)) have a nice weekend MF / LF fellows! Marco, IK1HSS ----Messaggio originale---- Da: markusvester@aol.com Data: 23-nov-2018 22.33 A: Ogg: Re: R: SLF: Carrier transmission at 80 Hz Wait until Stefan reaches DC! Then when the sun doesn't shine, he can conne= ct the receive antenna on the tree to the battery ;-) 73, Markus -----Urspr=C3=BCngliche Mitteilung----- Von: marcocadeddu@tin.it An: rsgb_lf_group Verschickt: Fr, 23. Nov. 2018 16:36 Betreff: R: SLF: Carrier transmission at 80 Hz ehm... some time ago I wrote here that there were worries at the Pentagon := -)))) =20 simply incredible! If next weekend I ear some hum coming from my devices now I know who is gui= lty! ;-))) FB Marco, Ik1HSS ----Messaggio originale---- Da: selberdenken@posteo.de Data: 23-nov-2018 10.21 A: Ogg: SLF: Carrier transmission at 80 Hz Dear SLF friends,=20 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 ------=_Part_12348_21837319.1543057456208 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Markus,

are you meaning DC as direct current or District of Colum= bia? :-))

have a nice weekend MF / LF fellows!

Marco, IK1HSS<= br>
----Messaggio originale----
Da: markusvester@aol.com
Data: 23-nov-2018 22.33
A: <rsgb_lf_group@blacksheep.org>
Ogg: Re: R: SLF: Carrier transmission at 80 Hz

Wait until Stefan reaches DC! Then when the sun doesn't = shine, he can connect the receive antenna on the tree to the battery&n= bsp;;-)

73, Markus



-----Urspr=C3=BCngliche Mitteilung= -----
Von: marcocadeddu@tin.it <marcocadeddu@tin.it>
An: rsgb_l= f_group <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 23. Nov. 20= 18 16:36
Betreff: R: SLF: Carrier transmission at 80 Hz

ehm... some time ago I wrote here that there were wo= rries at the Pentagon :-))))
 
simply incredible!

If next= weekend I ear some hum coming from my devices now I know who is guilty! ;-= )))

FB

Marco, Ik1HSS

----Messaggio originale----
Da: selberdenken@posteo.de
Data: 23-nov-2018 10.21
A: <rsgb_lf_group@blacksheep.org>
Ogg: 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/DK7F= C_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 fo= r 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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