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[195.171.43.25]) by mx.google.com with ESMTP id du3si3881675wib.66.2014.01.30.11.47.58 for ; Thu, 30 Jan 2014 11:47:59 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=fail (test mode) header.i=@comcast.net Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1W8w3C-0000um-FW for rs_out_1@blacksheep.org; Thu, 30 Jan 2014 18:09:18 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1W8w3B-0000ud-PI for rsgb_lf_group@blacksheep.org; Thu, 30 Jan 2014 18:09:17 +0000 Received: from qmta05.emeryville.ca.mail.comcast.net ([76.96.30.48]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1W8w37-0002F9-R4 for rsgb_lf_group@blacksheep.org; Thu, 30 Jan 2014 18:09:16 +0000 Received: from omta02.emeryville.ca.mail.comcast.net ([76.96.30.19]) by qmta05.emeryville.ca.mail.comcast.net with comcast id LH3M1n0090QkzPwA5J9AAy; Thu, 30 Jan 2014 18:09:10 +0000 Received: from Owner ([166.137.183.18]) by omta02.emeryville.ca.mail.comcast.net with comcast id LJ8o1n00s0QDnGu8NJ8udK; Thu, 30 Jan 2014 18:09:05 +0000 From: "hvanesce" To: References: <000f01cf1d9e$700b49e0$0802a8c0@acer> <52EA67D4.3060604@iup.uni-heidelberg.de> In-Reply-To: <52EA67D4.3060604@iup.uni-heidelberg.de> Date: Thu, 30 Jan 2014 11:08:46 -0700 Message-ID: <08be01cf1de6$5b817c90$128475b0$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJz8+QrnqcKpHJYb2YZ9oDGFnFlnwKcFvPsAjX7FfiZLUXHkA== Content-Language: en-us DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20121106; t=1391105350; bh=FVGZ2CaEcKls0JPaa4Lcii14A13ASB4tZquvINcfLwI=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=oSrKFdfrfCo1qqzz2aicO31bDYtTkL/HPAMYrQOH2ZjrZPRr/PEoUl4z/vjNxlBn4 g68cn6/laoK9PyMVc6mXDcb6hkD01veHwN6mRHFN1wTP9yzFo0jEuuCVVrV59P0tko oTV1R8lhJZDkmnv3RBUnZ6jsZ7uSQoN6PB0HJLw9tAegWzeLFUdlaX9fig1glyVJG4 eh5chAZMnT76IllRx62Mj73SGBBT+TUVvhfznW6Hd+lFUInbKtXQTg6uHlxew5IO+H qf7nllqt/LXggRHWMZ5RC4HshfQgjUfNDJcGwneVPG0hnBLDNNmkmYMxG/BXpH4Ixn ziYXsMZ/kWQUA== X-Spam-Score: -0.4 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Stefan, Is the TX antenna horizontal? (Like a standard dipole or end-fed?). I wanted to confirm, because a short horizontal antenna in the VLF is an interesting case (in theory, near-field strength similar to a vertical antenna, far-field strength less than a vertical antenna, and field strength at intermediate distances more or less than a vertical antenna depending on exact distance, soil conductivity and other factors). Performance at any distance would be interesting, and especially at distances of 1km or longer. [...] Content analysis details: (-0.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [76.96.30.48 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (hvanesce[at]comcast.net) -0.0 SPF_PASS SPF: sender matches SPF record -0.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 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: eec106d36eb876515d296e51093c048c Subject: LF: RE: Local VLF experiments in 3HD Content-Type: multipart/alternative; boundary="----=_NextPart_000_08BF_01CF1DAB.AF2340D0" 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 multipart message in MIME format. ------=_NextPart_000_08BF_01CF1DAB.AF2340D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Stefan, =20 Is the TX antenna horizontal? (Like a standard dipole or end-fed?). I = wanted to confirm, because a short horizontal antenna in the VLF is an = interesting case (in theory, near-field strength similar to a vertical antenna, far-field strength less than a vertical antenna, and field strength at intermediate distances more or less than a vertical antenna depending on exact distance, soil conductivity and other factors). Performance at any distance would be interesting, and especially at distances of 1km or = longer. =20 On another topic, I have some new, stable oscillators, including a very stable oscillator that should support bandwidths less than 50 uHz for 24 hours with or without GPS, over a wide temperature range. I am = interfacing two oscillators to SpecLab today (one oscillator for indoor use and the other for portable RX use). After the oscillators are interfaced to = SpecLab, I will be able to set up a 2-axis VLF grabber (online), and also do some meaningful VLF TX tests. In the past my VLF TX tests have been limited = by oscillator drift in the portable outdoor receiver that I use to measure = the TX field at long ranges. Now I should be able to perform TX tests at = 50uHz and narrower bandwidths for days at a time, at long distances (I can = leave the very-stable GPS-independent oscillator with an RX at remote = locations for long periods, regardless of temperature swings, to measure TX field strength). =20 I=92m looking forward to hearing about your tests; 5.7kHz is an = interesting frequency from a propagation standpoint, and the antenna performance = will be quite interesting.=20 =20 73, Jim AA5BW =20 =20 From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan = Sch=E4fer Sent: Thursday, January 30, 2014 7:55 AM To: rsgb_lf_group@blacksheep.org Subject: LF: Local VLF experiments in 3HD =20 Hi VLF friends,=20 For those how could be interested in local VLF experiments, i'm now transmitting on the 70m long 30m high antenna with the LOPT transformer. = TX power is just 3W. Mode is QRSS-400. The transmit frequency is 5.756666 = kHz, GPS "locked" in SpecLab. Last night i've done a first local test on that frequency, 30m distance. = The signal was visible in the grabber window, as well as a weak 3rd harmonic = was detected (3HD) at 17.27 kHz. Now, with the todays experiment i'm trying to receive that weak signal = on 5.75666 kHz from my home QTH in nearly 1 km distance. If successful, a = few /p receive tests will be done. And, in previous tests, "the big coil" = will be used.=20 73 and gl with your own projects :-) Stefan/DK7FC ------=_NextPart_000_08BF_01CF1DAB.AF2340D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Stefan,

 

Is the TX antenna horizontal? (Like a standard dipole or end-fed?). I = wanted to confirm, because a short horizontal antenna in the VLF is an = interesting case (in theory, near-field strength similar to a vertical = antenna, =A0far-field strength less than a vertical antenna, and field = strength at intermediate distances more or less than a vertical antenna = depending on exact distance, soil conductivity and other factors). = Performance at any distance would be interesting, and especially at = distances of 1km or longer.

 

On another topic, I have some new, stable oscillators, including a = very stable oscillator that should support bandwidths less than 50 uHz = for 24 hours with or without GPS, over a wide temperature range. I am = interfacing two oscillators to SpecLab today (one oscillator for indoor = use and the other for portable RX use). After the oscillators are = interfaced to SpecLab, I will be able to set up a 2-axis VLF grabber = (online), and also do some meaningful VLF TX tests. In the past my VLF = TX tests have been limited by oscillator drift in the portable outdoor = receiver that I use to measure the TX field at long ranges. Now I should = be able to perform TX tests at 50uHz and narrower bandwidths for days at = a time, at long distances (I can leave the very-stable GPS-independent = oscillator with an RX at remote locations for long periods, regardless = of temperature swings, to measure TX field = strength).

 

I’m looking forward to hearing about your tests; 5.7kHz is an = interesting frequency from a propagation standpoint, and the antenna = performance will be quite interesting.

 

73,=A0 Jim AA5BW =A0=A0=A0

 

From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan = Sch=E4fer
Sent: Thursday, January 30, 2014 7:55 = AM
To: rsgb_lf_group@blacksheep.org
Subject: LF: = Local VLF experiments in 3HD

 

Hi VLF = friends,

For those how could be interested in local VLF = experiments, i'm now transmitting on the 70m long 30m high antenna with = the LOPT transformer. TX power is just 3W. Mode is QRSS-400. The = transmit frequency is 5.756666 kHz, GPS "locked" in = SpecLab.
Last night i've done a first local test on that frequency, = 30m distance. The signal was visible in the grabber window, as well as a = weak 3rd harmonic was detected (3HD) at 17.27 kHz.
Now, with the = todays experiment i'm trying to receive that weak signal on 5.75666 kHz = from my home QTH in nearly 1 km distance. If successful, a few /p = receive tests will be done. And, in previous tests, "the big = coil" will be used.

73 and gl with your own projects = :-)

Stefan/DK7FC

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