Return-Path: <owner-rsgb_lf_group@blacksheep.org>
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 w13JxwAN007822
for <rlg@klubnl.pl>; Sat, 3 Feb 2018 21:00:01 +0100
Received: from majordom by post.thorcom.com with local (Exim 4.14)
id 1ei3oy-0007uG-7d
for rs_out_1@blacksheep.org; Sat, 03 Feb 2018 19:49:56 +0000
Received: from [195.171.43.32] (helo=relay1.thorcom.net)
by post.thorcom.com with esmtp (Exim 4.14)
id 1ei3ow-0007u7-DW
for rsgb_lf_group@blacksheep.org; Sat, 03 Feb 2018 19:49:54 +0000
Received: from gmy2-mh809.smtproutes.com ([94.186.192.138])
by relay1.thorcom.net with esmtp (Exim 4.89)
(envelope-from <luis@vigilant.es>)
id 1ei3ot-0008OI-DP
for rsgb_lf_group@blacksheep.org; Sat, 03 Feb 2018 19:49:53 +0000
X-Katharion-ID: 1517687366.10239.gmy2-mh809
Received: from servigilant.vigilant.es ([85.60.35.36]) by
gmy2-mh809.smtproutes.com [(94.186.192.138)] with ESMTP via TCP
(TLSv1/TLS_DHE_RSA_WITH_AES_256_CBC_SHA); 03 Feb 2018 19:49:26 +0000
Received: from servigilant.vigilant.local ([fe80::c40d:8140:d722:5448]) by
servigilant.vigilant.local ([fe80::c40d:8140:d722:5448%13]) with mapi id
14.03.0123.003; Sat, 3 Feb 2018 20:49:25 +0100
From: =?utf-8?B?VklHSUxBTlQgTHVpcyBGZXJuw6FuZGV6?= <luis@vigilant.es>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: VLF Small magnetic antenna for Tx
Thread-Index: AdObiQyh63VNGvw4QcWtV8Wk8Q5/tQACYOGAAAQMOoAAS4JigAANu+4AAAeGw40AAImlYw==
Date: Sat, 3 Feb 2018 19:49:25 +0000
Message-ID: <579355A36AEE9D4FA555C45D556003AB9AB495BA@servigilant.vigilant.local>
References: <579355A36AEE9D4FA555C45D556003AB9AB485D3@servigilant.vigilant.local>
<5A7377F7.4050802@posteo.de> <017101d39bab$2f0e3710$8d2aa530$@comcast.net>
<23159F1ED5BD49AD9654CE5685AFACF6@Clemens0811>,<5A75EA08.9090009@posteo.de>,<579355A36AEE9D4FA555C45D556003AB9AB4958F@servigilant.vigilant.local>
In-Reply-To: <579355A36AEE9D4FA555C45D556003AB9AB4958F@servigilant.vigilant.local>
Accept-Language: es-ES, en-US
Content-Language: es-ES
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [144.178.131.205]
MIME-Version: 1.0
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
the administrator of that system for details.
Content preview: Sorry, Typo: I mean I need 2H to resonate the antenna, not
2mH De: VIGILANT Luis FernĂĄndez Enviado: sĂĄbado, 3 de febrero de 2018 20:46
Para: rsgb_lf_group@blacksheep.org Asunto: Re: LF: VLF Small magnetic antenna
for Tx [...]
Content analysis details: (0.0 points, 5.0 required)
pts rule name description
---- ---------------------- --------------------------------------------------
X-Scan-Signature: 64437c466041e93ffedda7fb96b22b71
Subject: RV: LF: VLF Small magnetic antenna for Tx
Content-Type: text/plain; charset="utf-8"
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=TO_ADDRESS_EQ_REAL
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
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from base64 to 8bit by klubnl.pl id w13JxwAN007822
Sorry, Typo: I mean I need 2H to resonate the antenna, not 2mH
________________________________________
De: VIGILANT Luis FernĂĄndez
Enviado: sĂĄbado, 3 de febrero de 2018 20:46
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: VLF Small magnetic antenna for Tx
Thank you all for the very interesting comments. Looks like there is a lot to investigate in this field
and that is good. Wide room for further investigations :-)
Jacek, you mentioned what I was midnight oiling here
" If you want some semi-DX in the H-field, then try coupling into some long
conductors (pipes, power lines, railway tracks etc)"
What about coupling the loop to my 90m vertical ?
Adding another transformer from loop to vertical or just winding some coils of the vertical over the
small loop ring would work ?
Of course a tuned vertical with a huge coil would work better and run more current. But it is very hard
for me to get more than 180pF antenna capacity and that means 2mH coil for 8270Hz :(
Looks like this is something "easier" to test than winding super coils
What do you think about the coupling system ?
73 de Luis
EA5DOM
________________________________________
De: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] en nombre de DK7FC [selberdenken@posteo.de]
Enviado: sĂĄbado, 3 de febrero de 2018 17:57
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: VLF Small magnetic antenna for Tx
Or here:
https://de.wikipedia.org/wiki/Nahfeld_und_Fernfeld_(Antennen)#Nahfeld
73, Stefan
Am 03.02.2018 11:24, schrieb Clemens Paul:
> Hi Jim,
>
>
>> At 38kHz the impedance of the transmitting loopâs field at 100
>> meters is ~ 25 ohms,
>>
> I've found a graph showing Z_Wave over D/Ę.
> Near the loop: Z_wave = 377*(2pi*D) / lambda
>
> 73
> Clemens
> DL4RAJ
>
>
>
>> -----Original Message-----
>> From: owner-rsgb_lf_group@blacksheep.org
>> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of
>> hvanesce@comcast.net
>> Sent: Thursday, February 1, 2018 11:22 PM
>> To: rsgb_lf_group@blacksheep.org
>> Subject: RE: LF: VLF Small magnetic antenna for Tx
>>