Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v0FNEmgt010174 for ; Mon, 16 Jan 2017 00:14:49 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cStxE-00005b-3e for rs_out_1@blacksheep.org; Sun, 15 Jan 2017 23:11:16 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cStxD-00005S-Jj for rsgb_lf_group@blacksheep.org; Sun, 15 Jan 2017 23:11:15 +0000 Received: from omr-a011e.mx.aol.com ([204.29.186.59]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.87) (envelope-from ) id 1cStxA-00088H-8e for rsgb_lf_group@blacksheep.org; Sun, 15 Jan 2017 23:11:14 +0000 Received: from mtaomg-aah02.mx.aol.com (mtaomg-aah02.mx.aol.com [172.27.1.144]) by omr-a011e.mx.aol.com (Outbound Mail Relay) with ESMTP id F369538000BA for ; Sun, 15 Jan 2017 18:11:09 -0500 (EST) Received: from core-acb09h.mail.aol.com (core-acb09.mail.aol.com [172.27.24.9]) by mtaomg-aah02.mx.aol.com (OMAG/Core Interface) with ESMTP id B4EE838000089 for ; Sun, 15 Jan 2017 18:11:09 -0500 (EST) Received: from 188.192.95.60 by webprd-a16.mail.aol.com (10.72.58.192) with HTTP (WebMailUI); Sun, 15 Jan 2017 18:11:09 -0500 Date: Sun, 15 Jan 2017 18:11:09 -0500 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <159a4661096-4946-10800@webprd-a16.mail.aol.com> In-Reply-To: <587BE3EB.5070806@posteo.de> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.95.60] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1484521869; bh=yE1N1Hwn9pZ2jGbJ/jkJ0Irv0d3gRuetxoG8ipdePDI=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=gwSTxaPcjp/UZAc+2elCy4E9naSPGIaiiNd3lk9uPn6Hr8lZkzSWmPFcVFGCIgjA+ beaecqeFZ+cpz5K5XY3uUyaBclt1Il1ZbaJEj8CGWyFHZOoUVuIfmyJdcEk1OhiXQq 8bA1Wm3lQads65ObsEpFQ6EhUEQ+kYmeoxhR+guM= x-aol-sid: 3039ac1b0190587c018d18a3 X-Scan-Signature: cbf9d9751ac5f32708197d03fa6d8d74 Subject: Re: VLF: Back on 5.17 kHz / 58 km... Content-Type: multipart/alternative; boundary="----=_Part_85339_1150381954.1484521869460" 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 X-Scanned-By: MIMEDefang 2.75 Status: O X-Status: X-Keywords: X-UID: 10196 ------=_Part_85339_1150381954.1484521869460 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable No need for Paul to stay in the cold all night... I guess the idea is to ra= ise the kite to 60 m slant altitude above the anchor point, and let the ant= enna wire drop 170 m downwards (sic!) from there, straight to the house ;-)= =20 The signal on Jan 1st wasn't mine. My last VLF transmissions were Oct 1st = and Oct 30, both pure carrier on 8270.0025 and still visible in the Todmord= en spectrogram history. A somewhat stronger signal was radiated from a ball= oon on July 19.=20 Lacking sensitivity on lower frequencies, my poor grabber has been starving= . So we're looking forward to Stefan trying his new coil.=20 All the best, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: So, 15 Jan 2017 10:07 pm Betreff: Re: VLF: Back on 5.17 kHz / 58 km... Am 15.01.2017 20:46, schrieb Paul Nicholson: > > Yes I keep thinking about kites. It sounds like a lot > of fun. It is! But of course it's effort too. And you need the wind but i can=20 imagine that in north UK you will have enough wind on such a hill, even=20 with a power sled 24. > > I've had a powersled 36TT on order from Kiteworld (UK) > since last May, for some reason they don't seem to be > able to send one. I think that's like the one you > used in 2010 for your first series of VLF experiments. Mine was without TT. > I'll have to order one direct from Germany. Oh yes! ;-) > > Meanwhile I have a powersled 24 which is quite big > enough. It flies very steady. In the UK we are > limited to only 60m height above ground. I am > surrounded by hills of over 100m so I might anchor > the kite at the top of the hill behind the house - if > the wind is right it will be 60m above the anchor and > 170m above the house! Sounds very good. I hope there are no trees on that hill. But far away from the house you will need a generator which is heavy, so=20 you need a car. QRP in combination with kite antennas is not satisfying=20 i assume. And then, on LF the nights are more promising of course. But=20 then it's dark and cold :-( A piece of land on that hill, with a fence arround it, with a shed and=20 an oven and a generator and some accus as a buffer, and a BIG coil for=20 the band of interest! That's a DREAM! Why didn't we yet see a signal from you if the kite flies steady in the=20 wind? :-) What is missing to come on the air? > > > i tested (again) my new coil for 8270 Hz. > > It is a long time since I saw a signal on the 8270Hz > band. There was a carrier for 2 hours at 8270.002 on > 1st Jan 10:20 to 12:20 approx. Markus? The last strong > signal was 17th Dec from DJ8WX. Maybe you will see one in the next hours. > > I've been experimenting with changes to the sferic > blanking. Gained about 1dB at 5170. Your recent 24 char > daily repeats: > > Was Now > 10th -5.8 dB -4.5 dB (-62.6 dB in 2500Hz) > 11th -5.3 dB -4.5 dB > 12th -4.9 dB -3.7 dB (-61.8 dB in 2500Hz) Very interesting! And good that you have some data to experiment with.=20 And a significant improvement! Do you still have the data of my recent=20 transmissions, e.g. the 75 character message on 6470 Hz. Would be=20 interesting to see if less daily transmissions would have been=20 sufficient for a decode. And good to see that there's still more to be=20 gained! Maybe an interesting option for SpecLab? And what about the=20 super-AGC, Markus, Wolf? :-) > > The trick is to duplicate the VLF into 2 channels, > one channel triggers the blanker, the other channel > gets the blanking. Different filter settings on > each channel. 3kHz b/w on the triggering channel, > 1kHz b/w on the channel to be blanked. I think > there's still more to be gained but it takes a long > time to trial all the permutations. Interesting, i'm looking forward to the end-result. > > > i tried to install vlfrx-tools on my Raspi today! > > Don't be too disappointed. The USB on RPi is rubbish. > An old laptop would do better. OK, good to know. My idea is that i may need more gain in future ULF reception=20 experiments. A loop and an E field receiver, both working on separate=20 soundcards, combined and weighted with vlfrx-tools, to form a cardioid=20 pattern, that could help to gain maybe 6 dB SNR?! But it's probably not=20 an easy task to do that, at least as a beginner... OK, i'm on the roof again... 73, Stefan ------=_Part_85339_1150381954.1484521869460 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
No need for Paul to stay in the cold all night... I gues= s the idea is to raise the kite to 60 m slant altitude above= the anchor point, and let the antenna wire drop 170 m downw= ards (sic!) from there, straight to the house ;-) 

T= he signal on Jan 1st wasn't mine. My last VLF transmissions were Oct 1= st and Oct 30, both pure carrier on 8270.0025 and still visible in the Todm= orden spectrogram history. A somewhat stronger signal was radiated from&nbs= p;a balloon on July 19.

Lacking sensitivity on lower frequenci= es, my poor grabber has been starving. So we're looking forward t= o Stefan trying his new coil. 

All the best,
Markus&nbs= p;(DF6NM)


-----Urspr=C3=BCngliche Mitteilung-----
Von: DK7FC= <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blac= ksheep.org>
Verschickt: So, 15 Jan 2017 10:07 pm
Betreff: Re: VLF:= Back on 5.17 kHz / 58 km...

Am 15.01.2017 20:46, schrieb Paul= Nicholson:
>
> Yes I keep thinking about kites. It sounds lik= e a lot
> of fun.
It is! But of course it's effort too. And you ne= ed the wind but i can
imagine that in north UK you will have enough win= d on such a hill, even
with a power sled 24.
>
> I've had a= powersled 36TT on order from Kiteworld (UK)
> since last May, for so= me reason they don't seem to be
> able to send one. I think that's = like the one you
> used in 2010 for your first series of VLF experime= nts.
Mine was without TT.
> I'll have to order one direct from Ger= many.
Oh yes! ;-)
>
> Meanwhile I have a powersled 24 which = is quite big
> enough. It flies very steady. In the UK we are
&= gt; limited to only 60m height above ground. I am
> surrounded by hil= ls of over 100m so I might anchor
> the kite at the top of the hill b= ehind the house - if
> the wind is right it will be 60m above the anc= hor and
> 170m above the house!
Sounds very good. I hope there are= no trees on that hill.
But far away from the house you will need a gene= rator which is heavy, so
you need a car. QRP in combination with kite a= ntennas is not satisfying
i assume. And then, on LF the nights are more= promising of course. But
then it's dark and cold :-(
A piece of lan= d on that hill, with a fence arround it, with a shed and
an oven and a = generator and some accus as a buffer, and a BIG coil for
the band of in= terest! That's a DREAM!
Why didn't we yet see a signal from you if the k= ite flies steady in the
wind? :-) What is missing to come on the air?
>
> > i tested (again) my new coil for 8270 Hz.
><= br>> It is a long time since I saw a signal on the 8270Hz
> band. = There was a carrier for 2 hours at 8270.002 on
> 1st Jan 10:20 to 1= 2:20 approx. Markus? The last strong
> signal was 17th Dec from DJ8= WX.
Maybe you will see one in the next hours.
>
> I've been = experimenting with changes to the sferic
> blanking. Gained about 1d= B at 5170. Your recent 24 char
> daily repeats:
>
> = Was Now
> 10th -5.8 dB -4.5 dB (-62.6 dB in 2500Hz)
>= ; 11th -5.3 dB -4.5 dB
> 12th -4.9 dB -3.7 dB (-61.8 dB in 2500= Hz)
Very interesting! And good that you have some data to experiment wit= h.
And a significant improvement! Do you still have the data of my rece= nt
transmissions, e.g. the 75 character message on 6470 Hz. Would be interesting to see if less daily transmissions would have been
suffic= ient for a decode. And good to see that there's still more to be
gained= ! Maybe an interesting option for SpecLab? And what about the
super-AGC= , Markus, Wolf? :-)
>
> The trick is to duplicate the VLF into = 2 channels,
> one channel triggers the blanker, the other channel
= > gets the blanking. Different filter settings on
> each channel.= 3kHz b/w on the triggering channel,
> 1kHz b/w on the channel to b= e blanked. I think
> there's still more to be gained but it takes a= long
> time to trial all the permutations.
Interesting, i'm looki= ng forward to the end-result.
>
> > i tried to install vlfrx= -tools on my Raspi today!
>
> Don't be too disappointed. The US= B on RPi is rubbish.
> An old laptop would do better.
OK, good to = know.
My idea is that i may need more gain in future ULF reception
e= xperiments. A loop and an E field receiver, both working on separate
so= undcards, combined and weighted with vlfrx-tools, to form a cardioid
pa= ttern, that could help to gain maybe 6 dB SNR?! But it's probably not
a= n easy task to do that, at least as a beginner...

OK, i'm on the roo= f again...

73, Stefan

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