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 w63LwTgX026294 for ; Tue, 3 Jul 2018 23:58:32 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1faT6d-0003UF-2S for rs_out_1@blacksheep.org; Tue, 03 Jul 2018 22:45:03 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1faT3u-0003S0-OH for rsgb_lf_group@blacksheep.org; Tue, 03 Jul 2018 22:42:14 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1faT3j-0004Am-L5 for rsgb_lf_group@blacksheep.org; Tue, 03 Jul 2018 22:42:06 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 8750720E8D for ; Tue, 3 Jul 2018 23:42:00 +0200 (CEST) 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=1530654121; bh=yixJz7GBEp3+QCDxA88fFOhqnFCNHdtpL5x62/GYiwA=; h=Date:From:To:Subject:From; b=HUW6RLkXsqCYV9U33nIIkMIzsXtdQUaMMFguXeSkJVLphk3s+rd1T5LF55gTZ9exZ O9onJ+l4zvuIP6P9kcC7OowqeAXB6N0+tNXLahJiN93f3U3ui+hSV56Sy5Wsu4WfA/ oTfg8k1AzKdi8tGJtSMPWUBAAE4Ho/JB5UgqNPsAZ7F/jGqoEPPJR1/zDnjhFDzLR6 SI8HRM6J9REh4o+eSxPMpiJ1NGFLYYWqk+IQjrSXQ1K3+8Fpy2uy8VWFgbDczQtpWC s4SqwfutI6kur59qitch1r5gnDdmCQ4RJT9eO10CpBaHG6qnjvjw9OiOLjPsFkZptE 8Z0wBngwmMYww== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 41KyJ803G4z10cq for ; Tue, 3 Jul 2018 23:41:57 +0200 (CEST) Message-ID: <5B3BEDA5.9050902@posteo.de> Date: Tue, 03 Jul 2018 23:41:57 +0200 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: , , <5B38A763.17452.850587@roelof.ndb.demon.nl> <5B3BB75F.9030305@posteo.de> <000601d41303$c6719870$5354c950$@go2.pl> In-Reply-To: <000601d41303$c6719870$5354c950$@go2.pl> 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 Marcin, Keep us informed about your experiments. For you it may be more useful to try kite antennas! Give it a try, it is very easy a nd exciting! For power generation i used such a cheap generator: https://www.amazon.de/dp/B000QD1EHY/ For 500W it was running quite well, until i made the mistake to mix the oil and fuel BEFORE filling it into the tank. It is cheap and not very high quality but it is possible to carry it on your own, which was essential for my kite experiments. If you want quality, then by a Honda generator... [...] 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 [185.67.36.66 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 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 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: b64e297c4577ad617411a4f8f6174ca7 Subject: Re: LF: RE: Summer games / EARTH ANTENNAS Content-Type: multipart/alternative; boundary="------------040101060808010107040607" 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. --------------040101060808010107040607 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Marcin, Keep us informed about your experiments. For you it may be more useful to try kite antennas! Give it a try, it is very easy a nd exciting! For power generation i used such a cheap generator: https://www.amazon.de/dp/B000QD1EHY/ For 500W it was running quite well, until i made the mistake to mix the oil and fuel BEFORE filling it into the tank. It is cheap and not very high quality but it is possible to carry it on your own, which was essential for my kite experiments. If you want quality, then by a Honda generator... 73, Stefan Am 03.07.2018 21:26, schrieb Marcin: > > 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-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 > *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. > --------------040101060808010107040607 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Marcin,

Keep us informed about your experiments. For you it may be more useful to try kite antennas! Give it a try, it is very easy a nd exciting!

For power generation i used such a cheap generator: https://www.amazon.de/dp/B000QD1EHY/
For 500W it was running quite well, until i made the mistake to mix the oil and fuel BEFORE filling it into the tank.
It is cheap and not very high quality but it is possible to carry it on your own, which was essential for my kite experiments.
If you want quality, then by a Honda generator...

73, Stefan

Am 03.07.2018 21:26, schrieb Marcin:

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-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= 47-270 ohm and the FT-37-43 xfmr?  I'd like
to try that at VLF.

--------------040101060808010107040607--