Return-Path: X-Spam-DCC: paranoid 104; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t5ONI890026147 for ; Thu, 25 Jun 2015 01:18:08 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Z7tss-0006h8-Ni for rs_out_1@blacksheep.org; Thu, 25 Jun 2015 00:15:10 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Z7tss-0006gz-8l for rsgb_lf_group@blacksheep.org; Thu, 25 Jun 2015 00:15:10 +0100 Received: from omr-m10.mx.aol.com ([64.12.143.86]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from ) id 1Z7tso-0000c8-0r for rsgb_lf_group@blacksheep.org; Thu, 25 Jun 2015 00:15:09 +0100 Received: from mtaout-mae01.mx.aol.com (mtaout-mae01.mx.aol.com [172.26.254.141]) by omr-m10.mx.aol.com (Outbound Mail Relay) with ESMTP id 7B8A2705B9F0B for ; Wed, 24 Jun 2015 19:15:03 -0400 (EDT) Received: from White (ipb21bee4a.dynamic.kabel-deutschland.de [178.27.238.74]) by mtaout-mae01.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id C44DB3800008F for ; Wed, 24 Jun 2015 19:15:02 -0400 (EDT) Message-ID: <886C368E2090465FB7AD063731AEF28C@White> From: "Markus Vester" To: Date: Thu, 25 Jun 2015 01:15:00 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1435187703; bh=Do88RqjSx5suiEkqatbhYJm7sGmgS4wBVJ6MZhEGK9U=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=eV7kPk6y+tbcs2yzzq4zAoxX5vxlRJw5Y/of+c3jpIBTEBiI7juMWrawZSyPUD9mg ITRFPxrffGcyxDqcBCkeKBOI0yf6HB8NrMpVSSLHx4dOst+EUYV2gCwmK2RPenHGJy eTUVEydryJ9OGaNjrqTqyizIENlHW3w5Bc6zN5Io= x-aol-sid: 3039ac1afe8d558b39f6224e X-AOL-IP: 178.27.238.74 X-Scan-Signature: 4b1739ed9f8a5c36a1958dbdf5306bf7 Subject: Fw: LF: 476.181 kHz from indoor loop Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01D0AEE4.5B9C4990" 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3529 Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0015_01D0AEE4.5B9C4990 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Domenico, no, not me. The strong signal in = https://dl.dropboxusercontent.com/sh/qx230q4lxerepeo/AAD7lpktx1thN2B5rIgg= KW52a/argo0034.jpg is probably IQ2MI from Milano sending QRSS-3. To help save the planet, I have now reverted to the omnidirectional = electrical antenna and a 1.5 W QRP transmitter (ie. the driver of my = class-D LF PA). The antenna is currently in the low position 3 m above = the roof so radiated power is only around 5 mW. Now sending occasional = WSPR-2 sequences on 475.790 kHz. All the best, Markus From: Domenico IZ7SLZ=20 Sent: Wednesday, June 24, 2015 11:02 PM To: Markus Vester=20 Subject: LF: 476.181 kHz from indoor loop Good evening Markus,=20 please take a look to my Argo screenshots (every 5 minutes) https://www.dropbox.com/sh/qx230q4lxerepeo/AAA2TI6YL7zeSv8v_Noo4V-aa?dl=3D= 0 i'm not shure if this is your signal becouse my rx is not calibrated. = Are you sending some psk? 73 and have fun with your loop! Domenico iz7slz On Wednesday, 24 June 2015, Markus Vester wrote: Hi Mauro, this is a single turn loop, around 3.5 m wide and 3 m high, now = consisting of the braid of a piece of RG-216 coax cable. Required = capacitance for 475 kHz is 7.1 nF, made from five 33nF FKP capacitors = from the junk box, plus a couple of styroflex for fine tuning. It's fed = through a small ferrite toroid, 32 turns primary, 4 secondary. Loop = resistance at MF is about 0.57 ohm (Q~83), presumably largely affected = by losses from the nearfield environment (reinforced walls, house = wiring, etc). Using 35 W RF the loop current is 7.8 A. Some pics of the = former LF loop tests (32 A, 250 uW) are at = http://df6nm.bplaced.net/LF/Indoor_Loop/ . The purpose of this experiment is mainly to be able to provide a = signal for receiver testing, which (unlike my Marconi) can be left on = air during unfavourable weather. But it's really inefficient: An old ENI = broadband linear amplifier converts 140 W DC into 35 W of RF, of which = only ~ 2 mW are radiated. Yes it works also for WSPR - a couple of nights ago I did get spotted = by DK7FC, F59706 and SP5XSB. During the daytime the range would be much = shorter, and the signal is definitely too weak for a decode in = Heidelberg. Best 73, Markus (DF6NM) From: IK1WVQ Mauro=20 Sent: Wednesday, June 24, 2015 7:30 PM To: rsgb_lf_group@blacksheep.org ; rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: 476.181 kHz from indoor loop very interesting for WSPR tests ! few questions: - mono-turn or multi-turn ?? - what are you using for match to TX ??? many thanks and 73 de Mauro IK1WVQ At 12:11 24/06/2015, Markus Vester wrote: >I am currently running a DFCW-60 beacon on 476.181 kHz, using the=20 >same 10m^2 indoor transmit loop as previously on LF. With 35 Watts=20 >of RF input, estimated radiated power is around 2 mW, with lobes=20 >pointing west and east. > >The daytime groundwave signal is visible in the bottom panel of the=20 >DK7FC MF grabber. Going by the CCIR plots for 3 mS/m conductivity,=20 >the groundwave attenuation for this distance would be about 23 dB in=20 >excess off lossless 1/r propagation, resulting in approximately 0.2=20 >uV/m in Heidelberg. > >Best 73, >Markus (DF6NM) > > ------=_NextPart_000_0015_01D0AEE4.5B9C4990 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Domenico,
 
no, not me. The strong signal in https://dl.dropboxusercontent.com/sh/qx230q4l= xerepeo/AAD7lpktx1thN2B5rIggKW52a/argo0034.jpg is=20 probably IQ2MI from Milano sending QRSS-3.
 
To help save the planet, I have now = reverted to the=20 omnidirectional electrical antenna and a 1.5 W QRP transmitter (ie. = the=20 driver of my class-D LF PA). The antenna is currently in = the low=20 position 3 m above the roof so radiated power is only=20 around 5 mW. Now sending occasional WSPR-2 sequences on = 475.790=20 kHz.
 
All the best,
Markus

Sent: Wednesday, June 24, 2015 11:02 PM
Subject: LF: 476.181 kHz from indoor loop


Good evening Markus,=20
please take a look to my Argo screenshots (every 5 minutes)

https://www.dropbox.com/sh/qx230q4lxerepeo/AAA2TI6YL7zeSv= 8v_Noo4V-aa?dl=3D0

i'm not shure if this is your signal becouse my rx is not = calibrated. Are=20 you sending some psk?

73 and have fun with your loop!

Domenico iz7slz


On Wednesday, 24 June 2015, Markus Vester <markusvester@aol.com>=20 wrote:
Hi Mauro,
 
this is a single turn loop, around = 3.5 m wide and=20 3 m high, now consisting of the braid of a piece of RG-216 coax cable. = Required capacitance for 475 kHz is 7.1 nF, made from five 33nF FKP = capacitors=20 from the junk box, plus a couple of styroflex for fine tuning. It's = fed=20 through a small ferrite toroid, 32 turns primary, 4 secondary. = Loop=20 resistance at MF is about 0.57 ohm (Q~83), presumably largely = affected=20 by losses from the nearfield environment (reinforced walls, = house=20 wiring, etc). Using 35 W RF the loop current is 7.8 = A. Some pics of the former LF loop tests (32 = A, 250 uW)=20 are at http://df6nm.bplaced.net/LF/Indoor_Loop/ .
 
The purpose of this experiment = is mainly to=20 be able to provide a signal for receiver testing, which (unlike = my=20 Marconi) can be left on air during unfavourable weather. But=20 it's really inefficient: An old ENI broadband linear amplifier=20 converts 140 W DC into 35 W of RF, of which only ~ = 2 mW=20 are radiated.
 
Yes it works also for WSPR - = a couple of=20 nights ago I did get spotted by DK7FC, F59706 and SP5XSB. = During the=20 daytime the range would be much shorter, and the signal is definitely = too weak=20 for a decode in Heidelberg.
 
Best 73,
Markus (DF6NM)

From: IK1WVQ=20 Mauro
Sent: Wednesday, June 24, 2015 7:30 PM
To: rsgb_lf_group@blacksheep.org=20 ; rsgb_lf_group@blacksheep.org=20
Subject: Re: LF: 476.181 kHz from indoor = loop

very interesting for WSPR tests !

few=20 questions:

- mono-turn or multi-turn ??
- what are you using = for=20 match to TX ???

many thanks and
73 de Mauro = IK1WVQ


At=20 12:11 24/06/2015, Markus Vester wrote:
>I am currently running a = DFCW-60=20 beacon on 476.181 kHz, using the
>same 10m^2 indoor transmit = loop as=20 previously on LF. With 35 Watts
>of RF input, estimated = radiated power=20 is around 2 mW, with lobes
>pointing west and = east.
>
>The=20 daytime groundwave signal is visible in the bottom panel of the =
>DK7FC=20 MF grabber. Going by the CCIR plots for 3 mS/m conductivity, =
>the=20 groundwave attenuation for this distance would be about 23 dB in=20
>excess off lossless 1/r propagation, resulting in = approximately 0.2=20
>uV/m in Heidelberg.
>
>Best 73,
>Markus=20 = (DF6NM)
>
>


= ------=_NextPart_000_0015_01D0AEE4.5B9C4990--