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 w647dB0H029130 for ; Wed, 4 Jul 2018 09:39:14 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1facDi-0005xS-Dl for rs_out_1@blacksheep.org; Wed, 04 Jul 2018 08:28:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1facDC-0005wf-D1 for rsgb_lf_group@blacksheep.org; Wed, 04 Jul 2018 08:28:26 +0100 Received: from mail-ed1-x52a.google.com ([2a00:1450:4864:20::52a]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1facD9-0004zW-72 for rsgb_lf_group@blacksheep.org; Wed, 04 Jul 2018 08:28:25 +0100 Received: by mail-ed1-x52a.google.com with SMTP id a5-v6so3321540edt.5 for ; Wed, 04 Jul 2018 00:28:23 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=d2jElNnaPN5/FIgo8lZn3DVHWIQ5ZKk3ticc9AuSkBo=; b=M/7eino5UCZhMEwLHp6hrnSxIk6CIY12et2NFZB2oUM0ta8tfB8B4/xln8BpGo0sTh NLb27/xHzdbMlP2SinHlao7qdt2gceZUwx3kMyuGPLBK+zSYPQy8a5NZvkzdR9jmy7b8 yBf4QYCEHiVFTDPmoLshVugXIrCJJix/NHGh5XGFhIIJZHkBPEvGf+QlBYtns6vQSV1O zvwieHODMht7WqxKLpIbbJYGBXu7jZ1aaheFVVlH6GVUWjAXdLYaNPeGw0WWgQV7DoRm Vpq8eEBmGTRxg83u4BanrpesOWAzPuO7pPBrqnnEAoBfDnB2C1EhF8HG9ALZBguVTY3F qLPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=d2jElNnaPN5/FIgo8lZn3DVHWIQ5ZKk3ticc9AuSkBo=; b=uhcVgutZmnskSCsMfkk1LeI/C9T/7fin8HrvDYMZ78fQbVxZIBJ8YyjXBisb6tCPe7 h4FD4NRLt0ldADAIF6+xjN9BFk6mOaWVaXwtFTUqF30/SRaBbYzKky4CPyt7cNnTeq4s x2f63w28l6ejvoqVgp5JfoaiUQyQ/RKm/jNyKpi9ZyEvEG5Ra4BoDA00Fe1UIzGp1BNk KcC+Dw+lDb5/NyeUsYAQAo4OYZ1oMGqBCVgjVHXQTNqOqewaw5hjtAE+VGrCyndwQJ1t zpG5pQu6CE6oXIUQVO0GRd0vgn2p3+bozEHVJTUOSUYtGUaVLPqpGcL7V7EROA/VBBCT mljw== X-Gm-Message-State: APt69E1tO6/pdzQ23fRlToGChmaPgpx3NowD8tQKMS4pt4mGW64K19xM YG8ZmJBS5sL5PqKDu1B9mEztKlSla4bdO8Ds7gk= X-Google-Smtp-Source: AAOMgpfs7Aev/URsmSglVATaIEwGJ5w7fCIU6ILYDta+f9vruvb8p4WLpjyE2v0x5DS2whmqnmHkZfG6TOWdHW/KnuQ= X-Received: by 2002:a50:f4aa:: with SMTP id s39-v6mr1488640edm.262.1530689302334; Wed, 04 Jul 2018 00:28:22 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a50:9626:0:0:0:0:0 with HTTP; Wed, 4 Jul 2018 00:28:21 -0700 (PDT) In-Reply-To: <645966D6-E55F-4FFD-AFE9-4A2805A6C37E@gmail.com> References: <5B38A763.17452.850587@roelof.ndb.demon.nl> <5B3BB75F.9030305@posteo.de> <000601d41303$c6719870$5354c950$@go2.pl> <5B3BEDA5.9050902@posteo.de> <645966D6-E55F-4FFD-AFE9-4A2805A6C37E@gmail.com> From: Andy Talbot Date: Wed, 4 Jul 2018 08:28:21 +0100 Message-ID: To: LineOne 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. 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Content preview: That was my Tee antenna. 7 metres high, 12m top hat of three wires spaced 80mm I've never used ground loops Andy www.g4jnt.com On 4 July 2018 at 07:38, John Rabson wrote: [...] 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 [2a00:1450:4864:20:0:0:0:52a listed in] [list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (andy.g4jnt[at]gmail.com) -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 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 882bdeb3d60c37e569eb1f790f5c4a0f Subject: Re: LF: RE: Summer games / EARTH ANTENNAS Content-Type: multipart/alternative; boundary="00000000000020913c05702760d5" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=HTML_60_70,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 --00000000000020913c05702760d5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable That was my Tee antenna. 7 metres high, 12m top hat of three wires spaced 80mm I've never used ground loops Andy www.g4jnt.com On 4 July 2018 at 07:38, John Rabson wrote: > I found this in the files: > > "From G4JNT: 1mW (0dBm) of EIRP on 73kHz got 393km from me to G3PLX way > back in 1996. That was using slow CW (long before someone coined the nam= e > QRSSS for it) with a dot period of 40 seconds.=E2=80=9D > > Andy: did you use an earth current system, or was that a G0 (now SK)? > > John F5VLF > > On 3 Jul 2018, at 23:41, DK7FC wrote: > > 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 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 gues= s > 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 simp= le > 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 abo= ve > 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 Ju= ly! > > 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 en= d > (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 wir= e > 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 becam= e > 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. > > > --00000000000020913c05702760d5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
That was my Tee antenna.=C2=A0 7 metres high, 12m top hat = of three wires spaced 80mm
I've never used ground loops
<= br>


On 4 July 2018 at 07:38, John Rabson <john.rabson07@gmail.com> wrote:
<= div style=3D"line-height:1.22em;font-family:Georgia;font-size:13px">I found= this in the files:

"From G4JNT: 1mW (0dBm)=C2=A0 of EIRP on 73kHz = got 393km from me to G3PLX way back in 1996.=C2=A0 That was using slow CW (= long before someone coined the name QRSSS for it) with a dot period of 40 s= econds.=E2=80=9D

Andy: did you use an earth current system, or was that = a G0 (now SK)?

John F5VLF

On 3 Jul 2018, at 23:41, DK7FC <selberdenken@posteo.de> wrote:
Hi Marcin,= =C2=A0
<= br style=3D"font-family:Helvetica;font-size:12px;font-style:normal;font-var= iant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;= text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;bac= kground-color:rgb(255,255,255);text-decoration:none">Keep = us informed about your experiments. For you it may be more useful to try ki= te antennas! Give it a try, it is very easy a nd exciting!

For power generation i used such a= cheap generator:=C2=A0https://www.amaz= on.de/dp/B000QD1EHY/
For 500W it was running quite well, until i made t= he mistake to mix the oil and fuel BEFORE filling it into the tank.=C2=A0
It is ch= eap and not very high quality but it is possible to carry it on your own, w= hich 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 di= pole 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.=C2=A0I am waiting for autumn to contin= ue my experiments.=C2=A0
I am looking for a power generator for power supply in the f= ield.=C2=A0Can anyone recommend somet= hing?
=C2=A0
73! Marcin SQ2BXI
=C2= =A0
From:=C2=A0owner-rsgb_lf_group@blacksheep.org=C2=A0<owner-rsgb_lf_group@blacksheep.org>=C2=A0On Behalf O= f=C2=A0DK7FC
Sent:=C2=A0Tuesday, July 3, 2018 7:50 PM
To:=C2=A0rsgb_lf_group@blacksheep.org
Subject:=C2=A0LF: Summer gam= es / EARTH ANTENNAS
= =C2=A0
Hi Joe, VLF,=C2=A0

You seem to like to 'play= ' on the very low frequencies during the sunny days :-)=C2=A0

Same here! = My YL bought a house in JN39XI and we are spending almost each weekend ther= e in the peaceful silence. The forest is really great! I guess you know tha= t, as a Canadian.=C2=A0
Now i'm planning to receive some signals in=C2=A0JN39XI07=C2=A0.=C2=A0 BTW a most useful distance fo= r analysing my own signals from Heidelberg (about 55 km QRB).
Oh and i t= hink about playing with earth antennas again, you know!=C2=A0

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 I= CL7667, which can be driven by the 3.3 V GPIO output voltage could make a s= imple and effective 5W PA running at 12V.
The wire just needs to be 1000= m 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, w= hen 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 conduct= ivity). A few CW QSOs were done out of a 7 Ah gel battery and just 50W or s= o, in July!

And what about VLF and ULF using earth antennas? I remem= ber making 45 km distance on 8.97 kHz from the 700m long wire antenna, grou= nded 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 (act= ivity)!

73, Stefan


Am 03.07.2018 14:03, schrieb=C2=A0jcraig@mun.ca:
This was the first time SAQ was he= ard here using a mobile RX.=C2=A0 It was in a quiet location, a km=C2=A0 fr= om mains lines and other RF pollution.=C2=A0 SAQ became quite weak when=C2=A0
the= RX was in the forest however.=C2=A0 The trees must be good conductors at V= LF.=C2=A0=

Is the low-power miniwhip mentioned below the same new one designed= with=C2=A0
help from G4COL with a J310, Rs=3D 47-270 ohm and the FT-37-43 xfmr?= =C2=A0 I'd like=C2=A0
to try that at VLF.=C2=A0
=

--00000000000020913c05702760d5--