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 x3K9XTvs019290 for ; Sat, 20 Apr 2019 11:33:30 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1hHm4G-00056u-JM for rs_out_1@blacksheep.org; Sat, 20 Apr 2019 10:13:52 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1hHm0p-00056j-0X for rsgb_lf_group@blacksheep.org; Sat, 20 Apr 2019 10:10:19 +0100 Received: from emout03.email.it ([212.97.34.22]) by relay1.thorcom.net with esmtp (Exim 4.92) (envelope-from ) id 1hHm0d-00020U-AR for rsgb_lf_group@blacksheep.org; Sat, 20 Apr 2019 10:10:08 +0100 Received: from emout03.email.it (localhost [127.0.0.1]) by emout03.email.it (Postfix) with ESMTP id 96702961B3; Sat, 20 Apr 2019 11:10:04 +0200 (CEST) Received: from emout04.email.it (emout04.email.it [212.97.34.71]) by emout03.email.it (Postfix) with ESMTP id 740F4961AC; Sat, 20 Apr 2019 11:10:04 +0200 (CEST) Received: from emout04.email.it (localhost [127.0.0.1]) by emout04.email.it (Postfix) with ESMTP id 33AA1961D3; Sat, 20 Apr 2019 11:10:04 +0200 (CEST) Received: from x220.localnet (62-11-170-138.dialup.tiscali.it [62.11.170.138]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by emout04.email.it (Postfix) with ESMTPSA id 105EA961A5; Sat, 20 Apr 2019 11:10:03 +0200 (CEST) From: Claudio Pozzi To: rsgb_lf_group@blacksheep.org Cc: rsgb-lf-group@groups.io Subject: Re: LF: NEW VLF antenna Date: Sat, 20 Apr 2019 11:10 +0200 Message-ID: <8322825.7mmXssLqGI@x220> User-Agent: KMail/4.14.1 (Linux/3.16.0-4-amd64; KDE/4.14.2; x86_64; ; ) In-Reply-To: References: <5CADE53C.30201@posteo.de> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="nextPart2574788.FxR2rD87uU" Content-Transfer-Encoding: 7Bit X-Spam-Score: -0.4 (/) 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: On Thursday, April 18, 2019 07:31:13 PM DK1IS wrote: SNIP > Anyway, the idea is fascinating. Having no VLF crystals up to now, I > made some preliminary tests with a randomly available HC-6-U quartz, QRG > 2434 kHz, wavelength 123 m. And yes, it works! > > * [...] Content analysis details: (-0.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [212.97.34.22 listed in list.dnswl.org] 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (smtp01[at]email.it) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (smtp01[at]email.it) 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 318d3d373f5ffaa82e0969bd1985b258 X-SA-Exim-Scanned: No; SA Timed out after 180 secs 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. --nextPart2574788.FxR2rD87uU Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Thursday, April 18, 2019 07:31:13 PM DK1IS wrote: SNIP > Anyway, the idea is fascinating. Having no VLF crystals up to now, I > made some preliminary tests with a randomly available HC-6-U quartz, QRG > 2434 kHz, wavelength 123 m. And yes, it works! > > * TX: Sythesizer Schomandl MG100M, 300 Hz ... 100 MHz, smallest step > 0.1 Hz, Ri = 50 Ohms, P = 10 dBm, output tied to first leg of > quartz, alternatively direct to the antenna wire > * RX: Perseus SDR with an active rod antenna on my garage, fed by a > solar system, no external wire connections, air-line distance 100 m > to my shack > * Antena wire: 2 m or 4 m, laid out in the shack, tied to second leg > of quartz, alternatively direct to the TX output > > Results with 2 m antenna wire: > > * with quartz resonator: fres = 2,433,908.8 Hz, RX level at resonance > = - 63,1 dBm, - 3dB-bandwidth = 48.3 Hz resulting in Q = 50391 > * without quartz resonator: RX level = - 85,4 dBm resulting in a gain > of 22.3 dB with quartz > * comparision: my 13 m T-Marconi with top load 4 x 33 m, tuned to 2434 > kHz and fed by the synthesizer with 10 dBm results in a RX level of > - 32.1 dBm ;-) 63.1 dBm - 32.1 dBm = 31.0 dB : the quartz adapted antenna radiated power is 1/1000 respect the T-Marconi, so the efficiency is 0.1% Good DX ;-) Claudio, IK2PII -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui http://posta.email.it/caselle-di-posta-z-email-it.php?utm_campaign=email_Zimbra_102014=main_footer/f Sponsor: Soluzioni di email hosting per tutte le esigenze: dalle caselle gratuite a quelle professionali su piattaforma Zimbra, da quelle su proprio dominio a quelle certificate PEC. Confronta le soluzioni Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=13325&d=20-4 -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui http://posta.email.it/caselle-di-posta-z-email-it.php?utm_campaign=email_Zimbra_102014=main_footer/f Sponsor: Caselle con tuo dominio su piattaforma Zimbra, fino a 30 GB di spazio, sincronizzazione dati e backup Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=13324&d=20-4 --nextPart2574788.FxR2rD87uU Content-Transfer-Encoding: 7Bit Content-Type: text/html; charset="us-ascii"

On Thursday, April 18, 2019 07:31:13 PM DK1IS wrote:

 

SNIP

 

> Anyway, the idea is fascinating. Having no VLF crystals up to now, I

> made some preliminary tests with a randomly available HC-6-U quartz, QRG

> 2434 kHz, wavelength 123 m. And yes, it works!

>

> * TX: Sythesizer Schomandl MG100M, 300 Hz ... 100 MHz, smallest step

> 0.1 Hz, Ri = 50 Ohms, P = 10 dBm, output tied to first leg of

> quartz, alternatively direct to the antenna wire

> * RX: Perseus SDR with an active rod antenna on my garage, fed by a

> solar system, no external wire connections, air-line distance 100 m

> to my shack

> * Antena wire: 2 m or 4 m, laid out in the shack, tied to second leg

> of quartz, alternatively direct to the TX output

>

> Results with 2 m antenna wire:

>

> * with quartz resonator: fres = 2,433,908.8 Hz, RX level at resonance

> = - 63,1 dBm, - 3dB-bandwidth = 48.3 Hz resulting in Q = 50391

> * without quartz resonator: RX level = - 85,4 dBm resulting in a gain

> of 22.3 dB with quartz

> * comparision: my 13 m T-Marconi with top load 4 x 33 m, tuned to 2434

> kHz and fed by the synthesizer with 10 dBm results in a RX level of

> - 32.1 dBm ;-)

 

 

63.1 dBm - 32.1 dBm = 31.0 dB : the quartz adapted antenna radiated power is 1/1000 respect the T-Marconi, so the efficiency is 0.1%

 

Good DX ;-)

 

Claudio, IK2PII




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