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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: Stefan; I know your busy but are you using your house ant [30 meter vertical] for such results on8.9 kHz?? Your already DXing like with the kite ant!!! > Date: Sun, 15 Dec 2013 17:33:12 +0100 > From: Stefan.Schaefer@iup.uni-heidelberg.de > To: rsgb_lf_group@blacksheep.org; paul@abelian.netcom.co.uk > Subject: Re: LF: A short VLF experiment at DK7FC > > Hi Peter, VLF, > > Did you see a trace on your grabber? Can you show me a link or a screenshot? > The signal is well visible on Paul Nicholson's excellent VLF grabber, > http://abelian.org/vlf/fbins.shtml#p=1387116000&b=110&s=sp but far from > stable. Is instability is due to my signal of course. Distance to Paul > is 880 km, http://no.nonsense.ee/qth/map.html?qth=IO83XQ&from=jn49ik00wd > > You are right, there are many things to optimise. One thing is the > housing of the PA. Now it is just mounted on a wooden plate. It is a H > bridge using 4x IRFP460, switching directly at 230V*1.41, so the output > of the PA is on mains potential! There is no galvanic decoupling > transformer on the output (which would allow to use a grounded coax > then) because such a transformer would have to be a VERY big ferrite > core with many many turns (> 100). So the PA output is directly > connected to the primary winding of the loading coil, which couples its > field into the resonance winding (1200 turns). So the feed line is > floating on an unknown voltage which depends on the capacitive coupling > to sourrounding things. In the field experiments 2010/2011 this was no > problem. But now it is. I guess this is causing EMC problems to the /2 > frequency divider, sometimes. Thus, i will put it into a metallic box > which is grounded to earth potential. > > Another problem is the parallel capacitor which i have to add to come on > resonance. It's capacity is not high enough and i have to add about 10m > or wire hanging arround. This additional wire is moving in the wind > blasts and causes further instability of the signal (kind of AM due to > modulated resonance peak, i.e. antenna current). Another way would be to > add more turns to the coil but this antenna system is voltage limited > and it doesn't matter at all if i have to put [...] Content analysis details: (-0.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [65.55.116.48 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 -0.5 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: eec106d36eb876515d296e51093c048c Content-Type: multipart/alternative; boundary="_f530f8c3-71f9-476b-a317-4bcdd5df7e47_" Subject: RE: LF: A short VLF experiment at DK7FC X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=FORGED_HOTMAIL_RCVD, 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 Status: O X-Status: X-Keywords: X-UID: 1468 --_f530f8c3-71f9-476b-a317-4bcdd5df7e47_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Stefan=3B I know your busy but are you using your house ant [30 meter vertical] for s= uch results on8.9 kHz?? Your already DXing like with the kite ant!!! =20 > Date: Sun=2C 15 Dec 2013 17:33:12 +0100 > From: Stefan.Schaefer@iup.uni-heidelberg.de > To: rsgb_lf_group@blacksheep.org=3B paul@abelian.netcom.co.uk > Subject: Re: LF: A short VLF experiment at DK7FC >=20 > Hi Peter=2C VLF=2C >=20 > Did you see a trace on your grabber? Can you show me a link or a screensh= ot? > The signal is well visible on Paul Nicholson's excellent VLF grabber=2C=20 > http://abelian.org/vlf/fbins.shtml#p=3D1387116000&b=3D110&s=3Dsp but far = from=20 > stable. Is instability is due to my signal of course. Distance to Paul=20 > is 880 km=2C http://no.nonsense.ee/qth/map.html?qth=3DIO83XQ&from=3Djn49i= k00wd >=20 > You are right=2C there are many things to optimise. One thing is the=20 > housing of the PA. Now it is just mounted on a wooden plate. It is a H=20 > bridge using 4x IRFP460=2C switching directly at 230V*1.41=2C so the outp= ut=20 > of the PA is on mains potential! There is no galvanic decoupling=20 > transformer on the output (which would allow to use a grounded coax=20 > then) because such a transformer would have to be a VERY big ferrite=20 > core with many many turns (> 100). So the PA output is directly=20 > connected to the primary winding of the loading coil=2C which couples its= =20 > field into the resonance winding (1200 turns). So the feed line is=20 > floating on an unknown voltage which depends on the capacitive coupling=20 > to sourrounding things. In the field experiments 2010/2011 this was no=20 > problem. But now it is. I guess this is causing EMC problems to the /2=20 > frequency divider=2C sometimes. Thus=2C i will put it into a metallic box= =20 > which is grounded to earth potential. >=20 > Another problem is the parallel capacitor which i have to add to come on= =20 > resonance. It's capacity is not high enough and i have to add about 10m=20 > or wire hanging arround. This additional wire is moving in the wind=20 > blasts and causes further instability of the signal (kind of AM due to=20 > modulated resonance peak=2C i.e. antenna current). Another way would be t= o=20 > add more turns to the coil but this antenna system is voltage limited=20 > and it doesn't matter at all if i have to put 400W or 500W into the syste= m. >=20 > BTW this night/day it was 850 mA antenna current and about 400W RF=20 > power. I will plan to do more QRO=2C when the new capacitor is ready to u= se. >=20 > Here is an image of the arrangement=2C taken 30 minutes ago:=20 > https://dl.dropboxusercontent.com/u/19882028/VLF/20131215_165406.jpg >=20 > As soon as the C of "DK7FC" is finished=2C i will run some OPDS32=20 > sequences for DF6NM and Paul Nicholson and others :-) > BTW i have disconnected my VLF grabber antenna since the RX is=20 > overloaded anyway. Now it is easier to identify eventual phase glitches=20 > (could be on the RX side as well=2C though). >=20 > 73 and thanks for watching. >=20 > Stefan/DK7FC >=20 >=20 >=20 > Am 15.12.2013 14:49=2C schrieb PA1SDB=2C Peter: > > Stefan=2C > > Signal is O.K.=2C but stabillity is'nt :-( > > To much spread around center frequency. > > > > (I know.... I'm complaining about 0.01 Hz drift..........) > > > > 73's Peter > > > > > > ----- Original Message ----- From: "Stefan Sch=E4fer"=20 > > > > To: =3B "Paul" > > Sent: Sunday=2C December 15=2C 2013 4:14 AM > > Subject: Re: LF: A short VLF experiment at DK7FC > > > > > > Since 4:10 UTC=2C the signal is available without interruptions now on > > 8.97000500 kHz. > > > > 73=2C Stefan/DK7FC > > > > Am 14.12.2013 20:50=2C schrieb Stefan Sch=E4fer: > >> Hi all=2C > >> > >> Tomorrow the rain probability is just 10% and so i think i can risk=20 > >> to run a short VLF experiment on 8970.00500 Hz. I'm using the fixed=20 > >> antenna at JN49IK00WD. These days=2C the QRN is very low for quite a=20 > >> long time! The plan is to run about 500W RF power=2C or more=2C depend= ing=20 > >> on the voltage limit of the antenna. And the plan is to start=20 > >> transmitting tonite=2C after the experiment with VO1NA=2C i.e. i'll co= me=20 > >> on air arround 2 UTC=2C hopefully. I will run the test until the late= =20 > >> afternoon. First i'm TXing a stable frequency until 9 UTC=2C later som= e=20 > >> DFCW-600=2C and then maybe some tests in OPDS32. > >> Suggestions welcome. > >> BUT it all depends on the WX. If it starts to rain then i have to stop= . > >> Will someone give it a try and watch for me? > >> > >> 73=2C Stefan/DK7FC > > >=20 = --_f530f8c3-71f9-476b-a317-4bcdd5df7e47_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Stefan=3B
I know your busy bu= t are you using your house ant [30 meter vertical] for such results on8.9 k= Hz?? =3B Your already =3BDXing like with the kite ant!!!
 = =3B
>=3B Date: Sun=2C 15 Dec 2013 17:33:12 +0100
>=3B From: = Stefan.Schaefer@iup.uni-heidelberg.de
>=3B To: rsgb_lf_group@blackshee= p.org=3B paul@abelian.netcom.co.uk
>=3B Subject: Re: LF: A short VLF e= xperiment at DK7FC
>=3B
>=3B Hi Peter=2C VLF=2C
>=3B
&g= t=3B Did you see a trace on your grabber? Can you show me a link or a scree= nshot?
>=3B The signal is well visible on Paul Nicholson's excellent V= LF grabber=2C
>=3B http://abelian.org/vlf/fbins.shtml#p=3D1387116000&= amp=3Bb=3D110&=3Bs=3Dsp but far from
>=3B stable. Is instability i= s due to my signal of course. Distance to Paul
>=3B is 880 km=2C http= ://no.nonsense.ee/qth/map.html?qth=3DIO83XQ&=3Bfrom=3Djn49ik00wd
>= =3B
>=3B You are right=2C there are many things to optimise. One thin= g is the
>=3B housing of the PA. Now it is just mounted on a wooden p= late. It is a H
>=3B bridge using 4x IRFP460=2C switching directly at= 230V*1.41=2C so the output
>=3B of the PA is on mains potential! The= re is no galvanic decoupling
>=3B transformer on the output (which wo= uld allow to use a grounded coax
>=3B then) because such a transforme= r would have to be a VERY big ferrite
>=3B core with many many turns = (>=3B 100). So the PA output is directly
>=3B connected to the prim= ary winding of the loading coil=2C which couples its
>=3B field into = the resonance winding (1200 turns). So the feed line is
>=3B floating= on an unknown voltage which depends on the capacitive coupling
>=3B = to sourrounding things. In the field experiments 2010/2011 this was no
= >=3B problem. But now it is. I guess this is causing EMC problems to the = /2
>=3B frequency divider=2C sometimes. Thus=2C i will put it into a = metallic box
>=3B which is grounded to earth potential.
>=3B >=3B Another problem is the parallel capacitor which i have to add to co= me on
>=3B resonance. It's capacity is not high enough and i have to = add about 10m
>=3B or wire hanging arround. This additional wire is m= oving in the wind
>=3B blasts and causes further instability of the s= ignal (kind of AM due to
>=3B modulated resonance peak=2C i.e. antenn= a current). Another way would be to
>=3B add more turns to the coil b= ut this antenna system is voltage limited
>=3B and it doesn't matter= at all if i have to put 400W or 500W into the system.
>=3B
>=3B= BTW this night/day it was 850 mA antenna current and about 400W RF
>= =3B power. I will plan to do more QRO=2C when the new capacitor is ready to= use.
>=3B
>=3B Here is an image of the arrangement=2C taken 30 = minutes ago:
>=3B https://dl.dropboxusercontent.com/u/19882028/VLF/20= 131215_165406.jpg
>=3B
>=3B As soon as the C of "DK7FC" is finis= hed=2C i will run some OPDS32
>=3B sequences for DF6NM and Paul Nicho= lson and others :-)
>=3B BTW i have disconnected my VLF grabber antenn= a since the RX is
>=3B overloaded anyway. Now it is easier to identif= y eventual phase glitches
>=3B (could be on the RX side as well=2C th= ough).
>=3B
>=3B 73 and thanks for watching.
>=3B
>= =3B Stefan/DK7FC
>=3B
>=3B
>=3B
>=3B Am 15.12.2013 1= 4:49=2C schrieb PA1SDB=2C Peter:
>=3B >=3B Stefan=2C
>=3B >= =3B Signal is O.K.=2C but stabillity is'nt :-(
>=3B >=3B To much spr= ead around center frequency.
>=3B >=3B
>=3B >=3B (I know.... = I'm complaining about 0.01 Hz drift..........)
>=3B >=3B
>=3B &= gt=3B 73's Peter
>=3B >=3B
>=3B >=3B
>=3B >=3B ----- O= riginal Message ----- From: "Stefan Sch=E4fer"
>=3B >=3B <=3BStef= an.Schaefer@iup.uni-heidelberg.de>=3B
>=3B >=3B To: <=3Brsgb_lf_= group@blacksheep.org>=3B=3B "Paul" <=3Bpaul@abelian.netcom.co.uk>=3B<= br>>=3B >=3B Sent: Sunday=2C December 15=2C 2013 4:14 AM
>=3B >= =3B Subject: Re: LF: A short VLF experiment at DK7FC
>=3B >=3B
&g= t=3B >=3B
>=3B >=3B Since 4:10 UTC=2C the signal is available with= out interruptions now on
>=3B >=3B 8.97000500 kHz.
>=3B >=3B<= br>>=3B >=3B 73=2C Stefan/DK7FC
>=3B >=3B
>=3B >=3B Am 14= .12.2013 20:50=2C schrieb Stefan Sch=E4fer:
>=3B >=3B>=3B Hi all= =2C
>=3B >=3B>=3B
>=3B >=3B>=3B Tomorrow the rain probabi= lity is just 10% and so i think i can risk
>=3B >=3B>=3B to run a= short VLF experiment on 8970.00500 Hz. I'm using the fixed
>=3B >= =3B>=3B antenna at JN49IK00WD. These days=2C the QRN is very low for quit= e a
>=3B >=3B>=3B long time! The plan is to run about 500W RF pow= er=2C or more=2C depending
>=3B >=3B>=3B on the voltage limit of = the antenna. And the plan is to start
>=3B >=3B>=3B transmitting = tonite=2C after the experiment with VO1NA=2C i.e. i'll come
>=3B >= =3B>=3B on air arround 2 UTC=2C hopefully. I will run the test until the = late
>=3B >=3B>=3B afternoon. First i'm TXing a stable frequency = until 9 UTC=2C later some
>=3B >=3B>=3B DFCW-600=2C and then mayb= e some tests in OPDS32.
>=3B >=3B>=3B Suggestions welcome.
>= =3B >=3B>=3B BUT it all depends on the WX. If it starts to rain then i = have to stop.
>=3B >=3B>=3B Will someone give it a try and watch f= or me?
>=3B >=3B>=3B
>=3B >=3B>=3B 73=2C Stefan/DK7FC
= >=3B >=3B
>=3B
= --_f530f8c3-71f9-476b-a317-4bcdd5df7e47_--