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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: Markus; Proves you don't need an exotic ground system and 40 meter tall antenna! Works well for you. 73, Bob From: Sat, 11 Jan 2014 19:13:04 +0100 Subject: Re: VLF: 8270 (antenna and grounding) Yes. I sneaked a separate ground wire down the chimney to the basement, where PE and heating system are connected to the metal water inlet pipe. On a cold and dry winter day, the antenna resistance at LF (including the coil) is as low as 15 ohms. This probably is probably aided by a Faraday shielding effect from the thermal insulation under the roof, which is covered by a vapor-stop layer consisting of very thin aluminium foil strips - seems the roof is acting as a sort of ground screen. [...] Content analysis details: (-0.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [65.55.116.46 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (rjraide[at]hotmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.1 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 5888f019f789bb7da964f45b5f85ee04 Content-Type: multipart/alternative; boundary="_3f34d4b4-a885-411d-a30c-951eec4fe988_" Subject: RE: VLF: 8270 (antenna and grounding) X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=FORGED_HOTMAIL_RCVD,HTML_40_50, HTML_MESSAGE,TO_ADDRESS_EQ_REAL 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 --_3f34d4b4-a885-411d-a30c-951eec4fe988_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Markus=3B Proves you don't need an exotic ground system and 40 meter tall antenna! W= orks well for you. 73=2C Bob =20 From: markusvester@aol.com To: rsgb_lf_group@blacksheep.org Date: Sat=2C 11 Jan 2014 19:13:04 +0100 Subject: Re: VLF: 8270 (antenna and grounding) =0A= =0A= =0A= =0A= =0A= =0A= =0A= Yes. I sneaked a separate ground wire down the chimney to the =0A= basement=2C where PE and heating system are connected to the =0A= metal water inlet pipe. On a cold and =0A= dry winter day=2C the antenna resistance at LF (including the coil) is as l= ow =0A= as 15 ohms. This probably is probably aided by a Faraday =0A= shielding effect from the thermal insulation under the roof=2C which is =0A= covered by a vapor-stop layer consisting of very thin aluminium foil =0A= strips - seems the roof is acting as a sort of ground screen.=0A= =0A= The telescopic rod consists of several sliding =0A= sections separated by insulating plastic rings=2C which I thought was =0A= good. But I was plagued by erratic partial discharge problems between =0A= segments=2C which sometimes came and went away with wind-induced =0A= bending. Strong noise in my neighbour's FM radio=2C and strange krrrk krrrr= rk =0A= sounds coming out of the chimney doorlet. In a recent rework=2C =0A= I have connected all segments with little bolts=2C and tied =0A= the bottom of the mast to ground potential.=0A= =0A= 73=2C Markus=0A= =0A= =0A= =0A= From: Bob Raide =0A= Sent: Saturday=2C January 11=2C 2014 6:44 PM=0A= To: rsgb_lf_group@blacksheep.org =0A= =0A= Subject: RE: VLF: 8270=0A= =0A= Markus=3B That is an amazing antenna! That short to work so =0A= well at VLF. Evan for LF but it really works for you. I see no =0A= provision for ground system and would guess you use house plumbing for grou= nd =0A= system? =20 =0A= =0A= =0A= From: markusvester@aol.com To: rsgb_lf_group@blacksheep.org Date: =0A= Sat=2C 11 Jan 2014 18:26:30 +0100 Subject: Re: VLF: 8270 =0A= =0A= =0A= Bob=2C=0A= =0A= it's the same antenna that I use for LF. The =0A= mast is a fishing rod on an aluminium telescopic pole=2C pushed out of an u= nused =0A= chimney. It carries three topload legs (N=2C W and S)=2C about 42 m wire in= =0A= total (230 pF). The apex is 20 m AGL or 11 m above the roof=2C but the =0A= effective height is only 9 m (calibrated at 138 kHz). On VLF frequencies = =0A= this is probably even a bit lower due to increased shunting effect from tre= es. =0A= Assuming heff =3D 0.8 m=2C radiation resistance on 8.3 kHz would be 0.08 = =0A= milliohm. With 60 Watts input=2C I got 0.3 A and 25 kV rms=2C =0A= and radiated power (EMRP) would be around 7 microwatts.=0A= =0A= =0A= =0A= Here's a sketch of the wire layout and the =0A= auxiliary H- and E-field receive antennas:=0A= http://dl.dropboxusercontent.com/u/26404526/Hans-Fallada-59_antennas.jpg = =0A= =0A= One could actually see the antenna in Google =0A= Map's slant view=2C but the imagery may have changed since:=0A= http://dl.dropboxusercontent.com/u/26404526/googlemaps_df6nm_antenna.jpg=0A= http://maps.google.de/maps?ll=3D49.4158=2C11.1350&z=3D21=0A= =0A= Best 73=2C=0A= Markus=0A= =0A= From: Bob Raide =0A= Sent: Saturday=2C January 11=2C 2014 5:37 =0A= PM=0A= To: rsgb_lf_group@blacksheep.org =0A= Subject: RE: VLF: =0A= 8270=0A= =0A= Markus=3B What are you using for antenna =0A= on 8270? =20 =0A= =0A= =0A= =0A= From: bvgbob@hotmail.com To: =0A= rsgb_lf_group@blacksheep.org Date: Sat=2C 11 Jan 2014 14:28:32 +0100 Subject: RE: VLF: =0A= 8270 =0A= =0A= =0A= Hello Markus!=0A= Nice signal here=2C =0A= congratulations!=0A= =0A= Lubos=2C OK2BVG =0A= =0A= =0A= =0A= From: markusvester@aol.com To: =0A= rsgb_lf_group@blacksheep.org CC: paul@abelian.netcom.co.uk Date: =0A= Sat=2C 11 Jan 2014 13:59:58 +0100 Subject: Re: VLF: 8270 =0A= Took the carrier off air at 12:48. Looks =0A= like a good trace at OK2BVG=2C and a dash with marginal SNR in Todmorden UK= . =0A= =0A= =0A= 73=2C Markus=0A= =0A= =0A= From: Markus Vester =0A= =0A= Sent: Saturday=2C January 11=2C =0A= 2014 11:33 AM=0A= To: rsgb_lf_group@blacksheep.org =0A= Subject: VLF: =0A= 8270=0A= =0A= At 10:23 I have started to transmit a =0A= straight carrier on 8270.000 Hz=2C estimated ERP around 14 uW. If all stays= well=2C =0A= I'll leave it on for a couple of hours=2C trying to leave a dash on Lubos' = =0A= and perhaps Paul's spectrograms.=0A= =0A= 73=2C Markus =0A= (DF6NM) = --_3f34d4b4-a885-411d-a30c-951eec4fe988_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Markus=3B
Proves you don't ne= ed an exotic ground system and 40 meter tall antenna! =3B Works well fo= r you. 73=2C Bob
 =3B
From: markusve= ster@aol.com
To: rsgb_lf_group@blacksheep.org
Date: Sat=2C 11 Jan 201= 4 19:13:04 +0100
Subject: Re: VLF: 8270 (antenna and grounding)

= =0A= =0A= =0A= =0A= =0A= =0A= =0A=
Yes. =3BI =3Bsneaked =3Ba separate ground wire down the chimne= y to the =0A= basement=2C where =3BPE =3Band heating system are connected to the = =0A= metal =3Bwater inlet pipe. =3BOn a cold and =0A= dry winter day=2C the =3Bantenna resistance at LF (including the coil) = is as low =0A= as 15 ohms. =3BThis probably is =3Bprobably aided by =3Ba Farad= ay =0A= shielding effect from =3Bthe thermal insulation =3Bunder the roof= =2C which is =0A= covered =3Bby a vapor-stop layer consisting =3Bof very thin alumini= um foil =0A= strips - seems the roof is acting as a sort of ground screen.
= =0A=
 =3B
=0A=
The telescopic rod consists of several=  =3Bsliding =0A= sections separated by insulating plastic rings=2C which I thought was =0A= good. =3BBut I was plagued by =3Berratic partial discharge problems= between =0A= segments=2C which =3Bsometimes came and went =3Baway with wind-indu= ced =0A= bending. =3BStrong noise in my neighbour's FM radio=2C and strange krrr= k krrrrrk =0A= sounds coming out of the chimney doorlet. In a recent rework=2C =0A= I =3Bhave =3Bconnected all segments =3Bwith little bolts=2C and=  =3Btied =0A= the bottom of the mast to =3Bground potential.
=0A=
 =3B
=0A=
73=2C Markus
=0A=
=0A=

=0A=
=0A=
From: Bob Raide=
=0A=
Sent: Saturday=2C January 11=2C 2014 6:44 PM
=0A= =0A=
Subject: RE: VLF: 8270
=0A=

=0A=
Markus=3B
That is an amazing antenna! =3B That shor= t to work so =0A= well at VLF. =3B Evan for =3BLF but it really works for you. = =3B I see no =0A= provision for ground system and would guess you use house plumbing for grou= nd =0A= system?
 =3B
=0A=
=0A=
=0A= From: markusvester@aol.com
T= o: rsgb_lf_group@blacksheep= .org
Date: =0A= Sat=2C 11 Jan 2014 18:26:30 +0100
Subject: Re: VLF: 8270

=0A= =0A= =0A=
Bob=2C
=0A=
=  =3B
=0A=
it's the same antenna that =3BI us= e for LF. The =0A= mast is a fishing rod on an aluminium telescopic pole=2C pushed out of an u= nused =0A= chimney. =3BIt carries three topload legs (N=2C W and S)=2C about 42 m = wire in =0A= total (230 pF). The =3Bapex =3Bis 20 m AGL or 11 m above the roof= =2C but the =0A= effective height is only 9 m =3B(calibrated at 138 kHz). On VLF frequen= cies =0A= this is probably even a bit lower due to increased shunting effect from tre= es. =0A= Assuming heff =3D 0.8 m=2C radiation resistance on 8.3 kHz =3Bwould be&= nbsp=3B0.08 =0A= milliohm. With 60 Watts input=2C =3BI got =3B0.3 A and 25 kV rms=2C= =0A= and =3Bradiated power (EMRP) would be around 7 microwatts.
= =0A=
= =0A=
=0A=
 =3B
=0A=
Here's a sketch of the wire layout and= the =0A= auxiliary H- and E-field receive antennas:
=0A= =0A=
 =3B
=0A=
One could actually see the antenna&nbs= p=3Bin Google =0A= Map's slant view=2C =3Bbut =3Bthe imagery may have changed since:
=0A= =0A= =0A=
=  =3B
=0A=
Best 73=2C
=0A=
Markus
=0A=

=0A=
From: Bob Raide =0A=
Sent: Saturday=2C January= 11=2C 2014 5:37 =0A= PM
=0A= =0A=
Subject: RE: VLF: =0A= 8270
=0A=

=0A=
Markus=3B
What are you = using for antenna =0A= on 8270?
 =3B
=0A=
=0A=
=0A=
=0A=
From: bvgbob@hotma= il.com
To: =0A= rsgb_lf_group@blacksheep.org
Date: Sat=2C 11 Jan 2014 14:28:32 +0100
Subjec= t: RE: VLF: =0A= 8270

=0A= =0A= =0A=
Hello Markus!
= =0A=
Nice signal here=2C =0A= congratulations!
=0A=

=0A=
Lubos=2C OK2BVG

=0A=
=0A=
=0A=
=0A=
From: markusvester@aol= .com
To: =0A= rsgb_lf_group@blacksheep.org
CC: paul@abelian.netcom.co.uk
Date: =0A= Sat=2C 11 Jan 2014 13:59:58 +0100
Subject: Re: VLF: 8270

<= /div>=0A=
Took the carrier off air a= t 12:48. Looks =0A= like a good trace at OK2BVG=2C and a dash with marginal SNR in Todmorden UK= . =0A=
=0A=
 =3B
=0A=
73=2C Markus
= =0A=
 =3B
=0A=

= =0A=
From: Markus Veste= r =0A=
=0A=
Sent: Saturda= y=2C January 11=2C =0A= 2014 11:33 AM
=0A= =0A=
Subject: VLF:= =0A= 8270
=0A=

=0A=
At 10:23 I have started to= transmit a =0A= straight carrier on 8270.000 Hz=2C estimated ERP around 14 uW. If all stays= well=2C =0A= I'll leave it on for a couple of hours=2C trying to leave a dash on =3B= Lubos' =0A= and perhaps Paul's spectrograms.
=0A=
 =3B
=0A=
73=2C Markus =0A= (DF6NM)
= --_3f34d4b4-a885-411d-a30c-951eec4fe988_--