Return-Path: Received: from mtain-di03.r1000.mx.aol.com (mtain-di03.r1000.mx.aol.com [172.29.64.7]) by air-dd05.mail.aol.com (v129.4) with ESMTP id MAILINDD051-860b4d77c306375; Wed, 09 Mar 2011 13:12:22 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-di03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7913A380000A3; Wed, 9 Mar 2011 13:12:17 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PxNr5-0001jw-Eb for rs_out_1@blacksheep.org; Wed, 09 Mar 2011 18:11:27 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PxNr4-0001jn-Pb for rsgb_lf_group@blacksheep.org; Wed, 09 Mar 2011 18:11:26 +0000 Received: from smtpa1.mediabeam.com ([194.25.41.13] helo=smtpa2.mediabeam.com) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PxNr2-0007TJ-HK for rsgb_lf_group@blacksheep.org; Wed, 09 Mar 2011 18:11:26 +0000 Received: from UMS02-SMTP3 (balancer04.mediabeam.com [10.100.1.40]) by smtpa2.mediabeam.com (8.13.8/8.13.1) with ESMTP id p29IBIf2008518 for ; Wed, 9 Mar 2011 19:11:18 +0100 From: uwe-jannsen@kabelmail.de To: rsgb_lf_group@blacksheep.org Message-ID: <10133bbf243e4bd39ecf8e194140557c@kabelmail.de> Date: Wed, 09 Mar 2011 19:11:17 +0100 X-Priority: 3 (Normal) MIME-Version: 1.0 X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55 Subject: Re: Re: LF: VLF dj8wx on 8970.022Hz Content-Type: multipart/alternative; boundary="----41A0D5C589F545A682AC1E5D2558CC80" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_MESSAGE,NO_REAL_NAME, PRIORITY_NO_NAME 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d40074d77c30014e1 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) ------41A0D5C589F545A682AC1E5D2558CC80 Content-Type: text/plain; charset=Windows-1252 Content-Transfer-Encoding: quoted-printable Hello Gerhard, thanks for confirming the possibility of the high voltage. concerning the hot part of coil end:=20 the pvc insulating here is of no use when using 3A radial current.=20 if hanging=A0 p.e. a one metre long also isolated wire=A0 on the aerial= feeder one can see the blue Tesla fire.=20 best regards Uwe/dj8wx Von: rsgb_lf_group@blacksheep.org Gesendet: 08.03.2011 20:40 An: rsgb_lf_group@blacksheep.org Betreff: Re: LF: VLF dj8wx on 8970.022Hz Hello Uwe! Regarding to my experience, the 40kV are real. Considering the high power (anf thus current) you are running, the voltage would be much higher on my 550mH coil. 550mh =3D 31kOhm at 9000Hz =3D 3A*31kOhm =3D 93kV.....luckily I just can manage to get about 0.6A and thus Voltages are lower! Voltages above 10kV are usual when transmitting on VLF and therefore every effort should be taken on insulating the "hot" part of the antenna.=20 73 OE3GHB Gerhard Am Dienstag, den 08.03.2011, 19:27 +0100 schrieb uwe-jannsen@kabelmail.de: > Hi all, >=20 >=20 >=20 > Im doing some measurements trying to find out how low (high?) the ERP > of my system is. >=20 >=20 >=20 > the test lead of the oscilloscope in use has a resistor of 10Mohm. The > oscilloscope advise text says that I have to multiply the result by > 10. >=20 > OK. I added two other 10Mohm in series multiplyed the result by 1000 > and got 40000Vpp >=20 > using the twentieth of max TX power. 40kV? Is that possible? >=20 > the current from the coile foot into the radials was 0.145A (3 A with > max power).=20 >=20 > I cant measure the Tesla voltage when the power is raised because the > oscilloscope or other=20 >=20 > instruments indicate results without connected to the object under > test. >=20 >=20 >=20 > the station is on the air in mode QRSS3600 on 8970.022Hz since today > 1640UTC. >=20 >=20 >=20 > current into the radials: one Ampere. >=20 >=20 >=20 > who will try to calculate the ERP? >=20 > the aerial in use can be seen at=20 >=20 >=20 >=20 > http://dj8wx-dl.de/hompage500kHz/TX%20equipment.htm >=20 >=20 >=20 > fourth pic on the site. The shown 23m long wire has been lengthened to > 43m. >=20 >=20 >=20 > best regards >=20 > Uwe/dj8wx=20 >=20 >=20 >=20 > ------41A0D5C589F545A682AC1E5D2558CC80 Content-Type: text/html; charset=Windows-1252 Content-Transfer-Encoding: quoted-printable Hello Gerhard,

thanks for confirming the possibility of the high voltage.

concerning the hot part of coil end:
the pvc insulating here is of no use when using 3A radial current.
if hanging  p.e. a one metre long also isolated wire  on the aer= ial feeder one can see the blue Tesla fire.

best regards
Uwe/dj8wx
 
Von: rsgb_lf_group@blacksheep.org
Gesendet: 08.03.2011 20:40
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: VLF dj8wx on 8970.022Hz

Hello Uwe!

Regarding to my experience, the 40kV are real. Considering the high
power (anf thus current) you are running, the voltage would be much
higher on my 550mH coil. 550mh =3D 31kOhm at 9000Hz =3D 3A*31kOhm =3D 93kV.....luckily I just can manage to get about 0.6A and thus Voltages are lower!

Voltages above 10kV are usual when transmitting on VLF and therefore
every effort should be taken on insulating the "hot" part of the
antenna.

73
OE3GHB
Gerhard






Am Dienstag, den 08.03.2011, 19:27 +0100 schrieb
uwe-jannsen@kabelmail.de:
> Hi all,
>
>
>
> Im doing some measurements trying to find out how low (high?) the ERP=
> of my system is.
>
>
>
> the test lead of the oscilloscope in use has a resistor of 10Mohm. Th= e
> oscilloscope advise text says that I have to multiply the result by > 10.
>
> OK. I added two other 10Mohm in series multiplyed the result by 1000=
> and got 40000Vpp
>
> using the twentieth of max TX power. 40kV? Is that possible?
>
> the current from the coile foot into the radials was 0.145A (3 A with=
> max power).
>
> I cant measure the Tesla voltage when the power is raised because th= e
> oscilloscope or other
>
> instruments indicate results without connected to the object under > test.
>
>
>
> the station is on the air in mode QRSS3600 on 8970.022Hz since today<= br /> > 1640UTC.
>
>
>
> current into the radials: one Ampere.
>
>
>
> who will try to calculate the ERP?
>
> the aerial in use can be seen at
>
>
>
> http://dj8wx-dl.de/hompage500kHz/TX%20equipment.htm
>
>
>
> fourth pic on the site. The shown 23m long wire has been lengthened= to
> 43m.
>
>
>
> best regards
>
> Uwe/dj8wx
>
>
>
>


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