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 w63JWbG0025140 for ; Tue, 3 Jul 2018 21:32:38 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1faQwx-0002lk-T5 for rs_out_1@blacksheep.org; Tue, 03 Jul 2018 20:26:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1faQws-0002lZ-1x for rsgb_lf_group@blacksheep.org; Tue, 03 Jul 2018 20:26:50 +0100 Received: from mx-out.tlen.pl ([193.222.135.145]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1faQwp-0003zP-36 for rsgb_lf_group@blacksheep.org; Tue, 03 Jul 2018 20:26:48 +0100 Received: (wp-smtpd smtp.tlen.pl 28854 invoked from network); 3 Jul 2018 21:26:43 +0200 Received: from 89-71-156-80.dynamic.chello.pl (HELO LAPTOPCAAOTGEB) (bxi@go2.pl@[89.71.156.80]) (envelope-sender ) by smtp.tlen.pl (WP-SMTPD) with ECDHE-RSA-AES256-GCM-SHA384 encrypted SMTP for ; 3 Jul 2018 21:26:43 +0200 From: "Marcin" To: References: , , <5B38A763.17452.850587@roelof.ndb.demon.nl> <5B3BB75F.9030305@posteo.de> In-Reply-To: <5B3BB75F.9030305@posteo.de> Date: Tue, 3 Jul 2018 21:26:37 +0200 Message-ID: <000601d41303$c6719870$5354c950$@go2.pl> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQKsPnIqvDlTdEZgoXhPv+LdBxmqcAH/6/vgAlk+m5wBUEyh9wFvHCJLAqqLyyeif20M8A== Content-Language: pl X-WP-MailID: 5e4edbbebf07403f33e50431f19a8165 X-WP-AV: skaner antywirusowy Poczty o2 X-WP-SPAM: NO 0000000 [ITP9] X-Spam-Score: 0.0 (/) 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: Hello Stefan! From my experience, erth dipole work best on 630m. Unfortunately, in the north of Poland, the soil is well or very conductive. In rocky ground you can get much better results. I am waiting for autumn to continue my experiments. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [193.222.135.145 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 T_KAM_HTML_FONT_INVALID BODY: Test for Invalidly Named or Formatted Colors in HTML 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: edae4bc128aa121544439b7b7cfd26a1 Subject: LF: RE: Summer games / EARTH ANTENNAS Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01D41314.89FCD970" 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 multipart message in MIME format. ------=_NextPart_000_0007_01D41314.89FCD970 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hello Stefan! >From my experience, erth dipole work best on 630m. Unfortunately, in the north of Poland, the soil is well or very conductive. In rocky ground you can get much better results. I am waiting for autumn to continue my experiments. https://klubnl.pl/wpr/en/index.php/2018/01/09/most-na-wisle-elementem-anteny -czyli-eksperymentow-z-dipolami-ziemnymi-ciag-dalszy/ https://klubnl.pl/wpr/en/index.php/2017/11/26/kolejne-proby-z-antena-dipol-z iemny/ I am looking for a power generator for power supply in the field. Can anyone recommend something? 73! Marcin SQ2BXI From: owner-rsgb_lf_group@blacksheep.org On Behalf Of DK7FC Sent: Tuesday, July 3, 2018 7:50 PM To: rsgb_lf_group@blacksheep.org Subject: LF: Summer games / EARTH ANTENNAS Hi Joe, VLF, You seem to like to 'play' on the very low frequencies during the sunny days :-) Same here! My YL bought a house in JN39XI and we are spending almost each weekend there in the peaceful silence. The forest is really great! I guess you know that, as a Canadian. Now i'm planning to receive some signals in JN39XI07 . BTW a most useful distance for analysing my own signals from Heidelberg (about 55 km QRB). Oh and i think about playing with earth antennas again, you know! BTW did someone (of the group) ever tried to build a full size dipole for 137 kHz? I mean for transmitting! On a stony mountain/hill it could be better than expected. With a Raspi + GPS module one could build up a simple WSPR beacon and a ICL7667, which can be driven by the 3.3 V GPIO output voltage could make a simple and effective 5W PA running at 12V. The wire just needs to be 1000m long or so. In a low frequented forest it could lay there for some days... I remeber experimenting with a full size dipole on 630m in 2012, when the band was quite young. It worked well although the antenna was just 4m above the ground and the soil conductivity was not ideal (medium conductivity). A few CW QSOs were done out of a 7 Ah gel battery and just 50W or so, in July! And what about VLF and ULF using earth antennas? I remember making 45 km distance on 8.97 kHz from the 700m long wire antenna, grounded at each end (250W RF power if i remember correctly). That was about 15 dB in 3.8 mHz. But what would be possible on lower frequencies if the far end of the wire is well grounded? Time to fill that summer hole (activity)! 73, Stefan Am 03.07.2018 14:03, schrieb jcraig@mun.ca: This was the first time SAQ was heard here using a mobile RX. It was in a quiet location, a km from mains lines and other RF pollution. SAQ became quite weak when the RX was in the forest however. The trees must be good conductors at VLF. Is the low-power miniwhip mentioned below the same new one designed with help from G4COL with a J310, Rs= 47-270 ohm and the FT-37-43 xfmr? I'd like to try that at VLF. ------=_NextPart_000_0007_01D41314.89FCD970 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hello = Stefan!

From = my experience, erth dipole work best on 630m. Unfortunately, in the = north of Poland, the soil is well or very conductive. In rocky ground = you can get much better results. I am waiting = for autumn to continue my experiments. <= /p>

https://klubnl.pl/wpr/en/index.php/2018/01/09/most-na-wisle-= elementem-anteny-czyli-eksperymentow-z-dipolami-ziemnymi-ciag-dalszy/<= /p>

https://klubnl.pl/wpr/en/index.php/2017/11/26/kolejne-= proby-z-antena-dipol-ziemny/

I am looking for a power generator for = power supply in the field. Can anyone recommend = something?

 

73! Marcin = SQ2BXI

 

From: owner-rsgb_lf_group@blacksheep.org = <owner-rsgb_lf_group@blacksheep.org> On Behalf Of = DK7FC
Sent: Tuesday, July 3, 2018 7:50 PM
To: = rsgb_lf_group@blacksheep.org
Subject: LF: Summer games / EARTH = ANTENNAS

 

Hi Joe, VLF, =

You seem to like to 'play' on the very low frequencies during = the sunny days :-)

Same here! My YL bought a house in JN39XI and = we are spending almost each weekend there in the peaceful silence. The = forest is really great! I guess you know that, as a Canadian.
Now = i'm planning to receive some signals in JN39XI07 .  BTW = a most useful distance for analysing my own signals from Heidelberg = (about 55 km QRB).
Oh and i think about playing with earth antennas = again, you know!

BTW did someone (of the group) ever tried to = build a full size dipole for 137 kHz? I mean for transmitting! On a = stony mountain/hill it could be better than expected. With a Raspi + GPS = module one could build up a simple WSPR beacon and a ICL7667, which can = be driven by the 3.3 V GPIO output voltage could make a simple and = effective 5W PA running at 12V.
The wire just needs to be 1000m long = or so. In a low frequented forest it could lay there for some = days...

I remeber experimenting with a full size dipole on 630m = in 2012, when the band was quite young. It worked well although the = antenna was just 4m above the ground and the soil conductivity was not = ideal (medium conductivity). A few CW QSOs were done out of a 7 Ah gel = battery and just 50W or so, in July!

And what about VLF and ULF = using earth antennas? I remember making 45 km distance on 8.97 kHz from = the 700m long wire antenna, grounded at each end (250W RF power if i = remember correctly). That was about 15 dB in 3.8 mHz. But what would be = possible on lower frequencies if the far end of the wire is well = grounded?

Time to fill that summer hole (activity)!

73, = Stefan


Am 03.07.2018 14:03, schrieb jcraig@mun.ca: =

This = was the first time SAQ was heard here using a mobile RX.  It was in = a quiet location, a km  from mains lines and other RF = pollution.  SAQ became quite weak when
the RX was in the forest = however.  The trees must be good conductors at VLF.

Is the = low-power miniwhip mentioned below the same new one designed with =
help from G4COL with a J310, Rs=3D 47-270 ohm and the FT-37-43 = xfmr?  I'd like
to try that at VLF. =

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