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 w64GKSrH030848 for ; Wed, 4 Jul 2018 18:20:31 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fakFn-0007UP-FU for rs_out_1@blacksheep.org; Wed, 04 Jul 2018 17:03:39 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fakFL-0007UE-81 for rsgb_lf_group@blacksheep.org; Wed, 04 Jul 2018 17:03:11 +0100 Received: from mout.web.de ([212.227.17.12]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fakFJ-0005pG-Lu for rsgb_lf_group@blacksheep.org; Wed, 04 Jul 2018 17:03:10 +0100 Received: from [192.168.0.21] ([95.90.200.47]) by smtp.web.de (mrweb101 [213.165.67.124]) with ESMTPSA (Nemesis) id 0MHXxg-1fXQrH3lMK-003NH2 for ; Wed, 04 Jul 2018 18:03:07 +0200 To: rsgb_lf_group@blacksheep.org References: <5B38A763.17452.850587@roelof.ndb.demon.nl> <5B3BB75F.9030305@posteo.de> <000601d41303$c6719870$5354c950$@go2.pl> <5B3BEDA5.9050902@posteo.de> From: Eike DL3IKE Message-ID: Date: Wed, 4 Jul 2018 18:03:09 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <5B3BEDA5.9050902@posteo.de> Content-Language: de-DE X-Provags-ID: V03:K1:9LlWEPtlRB13wQa5f4cNZNC6sTtbGoPqq0hYZuDYjv6WSQv3Kgm 71T0CP66A/ISDWJQGuYtDWGtAPDEeVc9QyqSDv5OAIPpp/dgjtC2+2cW4x4kuMZuOHHx77I Wb4CSMdWBnt6G1Zp/L+5DtYMx27EmcdTnC0HX6X8PtMwOj7EdTNeJsaezX5+B3ZHTzBotId rf558ZSfonvxR5yscFQrA== X-UI-Out-Filterresults: notjunk:1;V01:K0:BcIo3TGN0Do=:NC741J9hbwyrQ/vpsbDAw/ nOE14/g93S8D+SBTh15YF/oR8iP0EYYfjHv7cpeWTGGjRDiNokdsVPE/u64xrbdDCGSt7Hovv ST40BfyKyjzpfeNdcuWYzRVyxZ7kBUF1IiqhW2FIlwSl/4ZQZ7PIRKt09uC6gtRfkx93hF0iD +0B/eCFEvp85/b2QLijZmLSTO7+Oetgo9jQGR4iSeQgpGaQqXkLAVjXzVnDidJZVX7/pERlip 4lnLD6WBJOA9HPa6jgvzcII3LR5Hsrz+oytGpzf8AZzcoMcFCaF3jSKX2QXuD/mH32yV4g7hB T6lUObLTpGbfj4rd5JDlFLhMPtwpdxjZNuobc4jE9HFA56sgjnh5SjDEiqcM5BjWVvjebsli4 oDKT+3AFVqwKwncUqE3lamkcKBg4IQdZv25RJbxv4pwshoMJC7gre4gGIyor28OWkTI96lTJo iQD8tZSm5jnhGHWiJ0OH7i8C6PpTtGBmlehSUAFBmsgk/NjfwafpAod8iLJ/UVTNRTo3k7BcG zH8SH+6v0vDiPaeJBEIuIt2+EybIyuknN+wg2Y6RegYfp7Up9c+8lNge/SuLXwMV6oqFsI4KO w8J934J7c3DydJO60/7DHI6W0+0s4IqxwMyFdiPYU+7+/JaW8pIW9HzeXZ4Eq74ll2qpTr3Aq /sHJ8DrTVH3lx3+eHJbbro/zC6zIXjgSVkKC9a8vOn5oGCOGpNAQBKp0k0dsOw5kxJh+jzL6m u9bHx1jSS6OFidFIxu6fbOQ0MJ2WcciTeV8sM4wDiN7hdU7yZhvnP4oiLEiCJukd0UPpfB0bU MsYWxNX X-Spam-Score: -0.7 (/) 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 all, what about these antenna ideas: Find a cross between a guardrail on a freeway and a non-electrified railroad. Connect one pole of the transmitter to the guardrail and one pole to the railroad. Also possible: connect one pole of the transmitter to the grounding of the power connection and one pole to the telephone line, which hangs a long distance on wooden poles. In both cases, the signal is spread over many kilometers. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [212.227.17.12 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dl3ike[at]web.de) -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 29f208b223fe7a2cb359508e38e2ea2d Subject: Re: LF: RE: Summer games / EARTH ANTENNAS Content-Type: multipart/alternative; boundary="------------6221D45E8239F72135E30A52" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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. --------------6221D45E8239F72135E30A52 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Hi all, what about these antenna ideas: Find a cross between a guardrail on a freeway and a non-electrified railroad. Connect one pole of the transmitter to the guardrail and one pole to the railroad. Also possible: connect one pole of the transmitter to the grounding of the power connection and one pole to the telephone line, which hangs a long distance on wooden poles. In both cases, the signal is spread over many kilometers. 30m aluminum foil strengthened with 30m bookbinding foil results in an area of approx. 18m ² to free space around. The slide can be pulled up by a kite as a top load and result in higher antenna currend. The kite antenna can also use the guardrail, the railwaytrack or the ground of the energy supplier as ground. These are certainly unusual ideas. But I think they´ll work well 70 Bäume de Eike DL3IKE >> >> >> 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 >> --------------6221D45E8239F72135E30A52 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 8bit Hi all,

what about these antenna ideas:
Find a cross between a guardrail on a freeway and a non-electrified railroad.
Connect one pole of the transmitter to the guardrail and one pole to the railroad.
Also possible: connect one pole of the transmitter to the grounding of the power connection
and one pole to the telephone line, which hangs a long distance on wooden poles.
In both cases, the signal is spread over many kilometers.

30m aluminum foil strengthened with 30m bookbinding foil results in an area of approx. 18m ² to free space around.
The slide can be pulled up by a kite as a top load and result in higher antenna currend. The kite antenna can also use the guardrail, the railwaytrack
or the ground of the energy supplier as ground.

These are certainly unusual ideas. But I think they´ll work well

70 Bäume de Eike DL3IKE


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


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