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[98.138.215.180]) by mx.google.com with ESMTPS id sc12si13505543igb.4.2014.01.19.07.11.57 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Sun, 19 Jan 2014 07:11:57 -0800 (PST) Received-SPF: pass (google.com: manual fallback record for domain of sentto-85080895-3563-1390144316-daveyxm=virginmedia.com@returns.groups.yahoo.com designates 98.138.215.180 as permitted sender) client-ip=98.138.215.180; Authentication-Results: mx.google.com; spf=pass (google.com: manual fallback record for domain of sentto-85080895-3563-1390144316-daveyxm=virginmedia.com@returns.groups.yahoo.com designates 98.138.215.180 as permitted sender) smtp.mail=sentto-85080895-3563-1390144316-daveyxm=virginmedia.com@returns.groups.yahoo.com; dkim=pass header.i=@yahoogroups.co.uk DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoogroups.co.uk; s=oscaro; t=1390144316; bh=Y9+vBYs0jkEPhJs8xfd0ZYrg4fqa38cPcJo0iMfRKf8=; h=Received:Received:X-Yahoo-Newman-Id:X-Sender:X-Apparently-To:X-Received:X-Received:X-Received:X-Received:X-Received:To:Cc:References:In-Reply-To:Message-ID:X-Mailer:X-MimeOLE:Thread-Index:X-Provags-ID:X-Originating-IP:X-eGroups-Msg-Info:From:X-Yahoo-Profile:Sender:MIME-Version:Mailing-List:Delivered-To:List-Id:Precedence:List-Unsubscribe:Date:Subject:Reply-To:X-Yahoo-Newman-Property:Content-Type; b=GfUfYwCzhgaXad8YxKEL12A1igkNO9hON/UyapVhTHP9tm+ta/Sn3l24cJC6Hd9cK3rK5E77yPXXn5WiUhMPU/pq4l9648yDPfvCbbhqq9Qk89uYEMj1qrTMMquXLb/sRQKvUTJW8f51s9ahMkhyhD+/5GgYX6qlYIyc2xjz9SE= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=oscaro; d=yahoogroups.co.uk; b=Bh/ylor7MAM7/n/Ayq5rUSb9MATfi5nXCiXnxVpMKoaghzvIHB2t6CAsHjUDDGYaL1/oUKVgbIEmfEBE29MjB7w3kmsqF8bPMZo1zIA7l5/BqhEeTbh1SnjH/pqNB/MaqHMDT6/6dqCFYnEg4887KPw0GhlEMpv6EMX3h75ixH0=; Received: from [98.138.100.109] by ng9.bullet.mail.ne1.yahoo.com with NNFMP; 19 Jan 2014 15:11:56 -0000 Received: from [10.193.39.23] by tg105.bullet.mail.ne1.yahoo.com with NNFMP; 19 Jan 2014 15:11:56 -0000 X-Yahoo-Newman-Id: 85080895-m3563 X-Sender: cpaul@gmx.net X-Apparently-To: rsgb_lf_group@yahoogroups.co.uk X-Received: (qmail 17937 invoked by uid 102); 19 Jan 2014 15:11:55 -0000 X-Received: from unknown (HELO mtaq1.grp.bf1.yahoo.com) (10.193.84.32) by m2.grp.bf1.yahoo.com with SMTP; 19 Jan 2014 15:11:55 -0000 X-Received: (qmail 19086 invoked from network); 19 Jan 2014 15:11:55 -0000 X-Received: from unknown (HELO mout.gmx.net) (212.227.17.22) by mtaq1.grp.bf1.yahoo.com with SMTP; 19 Jan 2014 15:11:55 -0000 X-Received: from Clemens0811 ([79.237.152.171]) by mail.gmx.com (mrgmx003) with ESMTPSA (Nemesis) id 0MTSrf-1VwHCn3FcF-00SL93 for ; Sun, 19 Jan 2014 16:11:55 +0100 To: Cc: References: <35FE4D7949D24153B93AD287570B1AA6@Clemens0811> <52CDB98E.2090806@iup.uni-heidelberg.de> <07DCC8F8EED14FA7A932FF8F90ED27A6@Clemens0811> <52CDD7DE.8080807@iup.uni-heidelberg.de> <34613E4DA8F14D389A2BCF8A04DDF0DA@Clemens0811> <52D1B87C.80005@freenet.de> <52D1C679.9070506@freenet.de> In-Reply-To: <52D1C679.9070506@freenet.de> Message-ID: <81046BF0DF784FB18751214A2CE7347A@Clemens0811> X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 Thread-Index: Ac8PHaJkddXtu+YYTge52Rfv7h0E8gGBpvag X-Provags-ID: V03:K0:NR06jg+meOaqN7HXCsiOE4Bqod980b4KVdx1Oe8FFINnKDrzt3b /n/Dv3q3OAHem3bAFtiSvdUXx+VursC2uYD6zvAPYTVE3PiMn5F1tV4ghlfQ32ESA5D4OQu 8Nn85A6cScT88GrMaDSWdVSbHxNhuc3eR5esPyYAPY3wUS5ppXcyt4ui+Q6b1XJJDZfIZ6o kN5SlDXgc1jmBEWvPbHUA== X-Originating-IP: 10.193.84.32 X-eGroups-Msg-Info: 1:12:0:0:0 From: "Clemens Paul" X-Yahoo-Profile: dl4raj Sender: rsgb_lf_group@yahoogroups.co.uk MIME-Version: 1.0 Mailing-List: list rsgb_lf_group@yahoogroups.co.uk; contact rsgb_lf_group-owner@yahoogroups.co.uk Delivered-To: mailing list rsgb_lf_group@yahoogroups.co.uk List-Id: Precedence: bulk List-Unsubscribe: Date: Sun, 19 Jan 2014 16:11:55 +0100 Subject: [rsgb_lf_group] RE: LF: MW Antenna [was:RE: Clemens on MF!!] Reply-To: rsgb_lf_group@yahoogroups.co.uk X-Yahoo-Newman-Property: groups-email-ff-m Content-Type: multipart/alternative; boundary="SsDgMmpHGy7Zce4XI3V1EWSUNJh7h9O7-bmMLZd" --SsDgMmpHGy7Zce4XI3V1EWSUNJh7h9O7-bmMLZd Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi Wolf, I've tried the T-Antenna mode this weekend. It was excited against PE (protective earth of the house). Matching was surprisingly easy by a series C of around 1340pF, R (the real part) happened to be 50 Ohm (in dipole mode it varies between = 60 and 70 Ohm). The effect was dramatic in any sense.=20 Ground wave signal strength went up by ~ 20dB as measured on a remote Perse= us in Amberg (nr N=FCrnberg) this afternoon. Sky wave signal strength during last night went up by at least 6dB,maybe 10= dB (diifficult to measure because of qsb while changing the configuration) in = DL as well in OH (1900km distance) on a remote Perseus. Now the downside:Rx noise level went up by roughly the same amount (day/nig= ht) and funny things happened when TXing with full power. The TV and some lights in the living room went off and on,there was hum in = the telephone etc. The RX noise problem could easily be solved by switching the two antenna mo= des automatically with the PTT line and a few relays. The EMI problem perhaps by a separate earth? 73 Clemens DL4RAJ=20 =20 >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org=20 >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of wolf_dl4yhf >Sent: Saturday, January 11, 2014 11:32 PM >To: rsgb_lf_group@blacksheep.org >Subject: Re: LF: RE: Clemens on MF!! > >Hi Clemens, > > >Am 11.01.2014 22:58, schrieb Clemens Paul: >> The dipole is a horizontal 90=B0V, 8-15m high and according to=20 >EZNEC it has a spheroidal >> pattern with no nulls. >Ok... that makes a difference. >> The vertical part of the feeder is only about 6m long. >So the rainworms will be cosy and warm around the lower parts of the=20 >antenna, hi.. >> Tomorrow I'll check the impedance of the antenna aagainst=20 >ground with both feeder wires >> connected >> and see if I can match it to 50 Ohm,dependent on the available parts. >That would be a good indicator for the ground conductivity. >At the local antenna farm, the total resistance (after=20 >compensating the=20 >reactive part with a series coil) went up from 26 to approx 35 ohms=20 >within a few months. >During transmit, I simply use the PE (plus possibly the underground=20 >cables) as counterpoise. During RX, the PE is disconnected from the=20 >antenna's own 'ground' which consists of a few buried wires,=20 >to prevent=20 >QRM from the mains creeping in. Another remote RX antenna is already=20 >planned, most likely it will be a small active loop or a system of=20 >crossed loops. > >Cheers, > Wolf. > >( where is everyone .. now hearing only " -... .. .- " ? ) > > --SsDgMmpHGy7Zce4XI3V1EWSUNJh7h9O7-bmMLZd Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable  
=20=20=20=20=20=20 =20=20=20=20=20=20

Hi Wolf,

I've tried the T-Antenna mode this weekend.
It was excited against PE (protective earth of the house).
Matching was surprisingly easy by a series C of around 1340pF,
R (the real part) happened to be 50 Ohm (in dipole mode it varies between = 60 and 70 Ohm).
The effect was dramatic in any sense.
Ground wave signal strength went up by ~ 20dB as measured on a remote Perse= us in
Amberg (nr N=FCrnberg) this afternoon.
Sky wave signal strength during last night went up by at least 6dB,maybe 10= dB
(diifficult to measure because of qsb while changing the configuration) in = DL as well
in OH (1900km distance) on a remote Perseus.
Now the downside:Rx noise level went up by roughly the same amount (day/nig= ht)
and funny things happened when TXing with full power.
The TV and some lights in the living room went off and on,there was hum in = the telephone
etc.
The RX noise problem could easily be solved by switching the two antenna mo= des
automatically with the PTT line and a few relays.
The EMI problem perhaps by a separate earth?

73
Clemens
DL4RAJ


>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of wolf_dl4yhf >Sent: Saturday, January 11, 2014 11:32 PM
>To: rsgb_lf_group@blacksheep.org
>Subject: Re: LF: RE: Clemens on MF!!
>
>Hi Clemens,
>
>
>Am 11.01.2014 22:58, schrieb Clemens Paul:
>> The dipole is a horizontal 90=B0V, 8-15m high and according to >EZNEC it has a spheroidal
>> pattern with no nulls.
>Ok... that makes a difference.
>> The vertical part of the feeder is only about 6m long.
>So the rainworms will be cosy and warm around the lower parts of the >antenna, hi..
>> Tomorrow I'll check the impedance of the antenna aagainst
>ground with both feeder wires
>> connected
>> and see if I can match it to 50 Ohm,dependent on the available par= ts.
>That would be a good indicator for the ground conductivity.
>At the local antenna farm, the total resistance (after
>compensating the
>reactive part with a series coil) went up from 26 to approx 35 ohms >within a few months.
>During transmit, I simply use the PE (plus possibly the underground >cables) as counterpoise. During RX, the PE is disconnected from the >antenna's own 'ground' which consists of a few buried wires= ,
>to prevent
>QRM from the mains creeping in. Another remote RX antenna is already >planned, most likely it will be a small active loop or a system of
>crossed loops.
>
>Cheers,
> Wolf.
>
>( where is everyone .. now hearing only " -... .. .- " ?= )
>
>

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