Date: Sun, 20 Aug 2017 05:11:49 -0400
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
Message-Id: <15dfee99b81-7bd4-26e7d@webprd-a74.mail.aol.com>
In-Reply-To: <59983617.5090506@posteo.de>
MIME-Version: 1.0
Subject: Re: VLF: Carrier on 4470.005 Hz!
Content-Type: multipart/alternative; 
	boundary="----=_Part_189595_1995163166.1503220308862"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: RO

------=_Part_189595_1995163166.1503220308862
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

Hi Stefan,

this morning, an unambiguous peak has come up on the DL0AO cardioid in 31 u=
Hz:=20
http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm
The signal level (-140 dB) seems to be similar to that previously observed =
on 3675 Hz (noting that the gain of the synthetic cardioid summation has si=
nce been reduced by 6 dB to make it equal to the single antennas).  We can =
probably hope for improved SNR during the day.

Well done again!

Best 73,
Markus (DF6NM)  =20


-----Urspr=C3=BCngliche Mitteilung-----=20
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 19. Aug 2017 15:01
Betreff: Re: VLF: Carrier on 4470.005 Hz!


...Rather 5 uW.

 Am 19.08.2017 14:28, schrieb DK7FC:=20
Hello VLF,=20

 I un-wound the defective stack of the large coil which was used for 2970 H=
z. It took about 4 hours to carefully unwound about 1000 turns, or about 1 =
km of wire. The wire will be used for new coils which are already planned.

 Now, the remaining 4 stacks should hold at least 15 kV. I connected the co=
il to the antenna and found the resonance close to 4470 Hz.=20
 Now i'm running (since 12 UTC) a carrier transmission on 4470.005 Hz. The =
antenna current is just 150 mA. That's an ERP of about 3 uW. A first signal=
 on the 67 km band from here :-)
 Let's see how long it holds until there is the next fault :-/

 Reports/Spectrograms welcome...

 As usual there is a monitoring of the signal in 3.5 km distance from my tr=
ee grabber: http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber=
2.html

 73, Stefan

 Am 13.08.2017 22:17, schrieb DK7FC:=20
The repetition of yesterdays message failed. At 15:38 UTC the safety functi=
on tripped. I've just been on the roof, when re-starting the transmission i=
 can see a spark in the center of one of the stacks. So now there is anothe=
r one which has a flash over! :-(
 It must be replaced, which is a lot of work. So the tranmissions on 3675 H=
z will stopp for some time. At least we have some carrier detections and ev=
en EbNaut decodes.

 I need to think about a different coil concept.... More current, more volt=
age, more power, more more more!
------=_Part_189595_1995163166.1503220308862
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable

<div style=3D"font-size:10pt;font-family:arial,helvetica,sans-serif;color:b=
lack;"><div style=3D"color: black; font-family: arial,helvetica,sans-serif;=
 font-size: 10pt;">Hi Stefan,<br><br>this morning,&nbsp;an unambiguous&nbsp=
;peak has come up on the DL0AO cardioid in 31 uHz:&nbsp;<br>http://df6nm.bp=
laced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm<br>The signal level&nb=
sp;(-140 dB) seems to be similar to that previously observed on 3675 Hz (no=
ting&nbsp;that&nbsp;the gain of the synthetic cardioid summation has since =
been reduced by 6 dB to make it equal to the single antennas).&nbsp;&nbsp;W=
e can probably hope for improved SNR&nbsp;during the day.<br><br>Well done =
again!<br><br>Best 73,<br>Markus (DF6NM)&nbsp;&nbsp;&nbsp;<br><br><br>-----=
Urspr=C3=BCngliche Mitteilung----- <br>Von: DK7FC &lt;selberdenken@posteo.d=
e&gt;<br>An: rsgb_lf_group &lt;rsgb_lf_group@blacksheep.org&gt;<br>Verschic=
kt: Sa, 19. Aug 2017 15:01<br>Betreff: Re: VLF: Carrier on 4470.005 Hz!<br>=
<br></div>
<div id=3D"AOLMsgPart_2_9683b59a-bc42-4336-a514-feafecbd60ca">
<div class=3D"aolReplacedBody" text=3D"#000000" bgcolor=3D"#ffffff">
...Rather 5 uW.<br>
<br>
Am 19.08.2017 14:28, schrieb DK7FC:
<blockquote cite=3D"about:blank">
 =20
Hello VLF, <br>
  <br>
I un-wound the defective stack of the large coil which was used for
2970 Hz. It took about 4 hours to carefully unwound about 1000 turns,
or about 1 km of wire. The wire will be used for new coils which are
already planned.<br>
  <br>
Now, the remaining 4 stacks should hold at least 15 kV. I connected the
coil to the antenna and found the resonance close to 4470 Hz. <br>
Now i'm running (since 12 UTC) a carrier transmission on <b>4470.005 Hz</b>=
.
The
antenna current is just <b>150 mA</b>. That's an ERP of about <b>3
uW</b>. A first signal on the <b>67 km band</b> from here :-)<br>
Let's see how long it holds until there is the next fault :-/<br>
  <br>
Reports/Spectrograms welcome...<br>
  <br>
As usual there is a monitoring of the signal in 3.5 km distance from my
tree grabber:
  <a class=3D"aolmail_moz-txt-link-freetext" href=3D"http://www.iup.uni-hei=
delberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html" target=3D"_blank" rel=3D"n=
oopener noreferrer">http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF=
_Grabber2.html</a><br>
  <br>
73, Stefan<br>
  <br>
Am 13.08.2017 22:17, schrieb DK7FC:
  <blockquote cite=3D"about:blank">
   =20
The repetition of yesterdays message failed. At 15:38 UTC the safety
function tripped. I've just been on the roof, when re-starting the
transmission i can see a spark in the center of one of the stacks. So
now there is another one which has a flash over! :-(<br>
It must be replaced, which is a lot of work. So the tranmissions on
3675 Hz will stopp for some time. At least we have some carrier
detections and even EbNaut decodes.<br>
    <br>
I need to think about a different coil concept.... More current, more
voltage, more power, more more more!<br>
  </blockquote>
</blockquote>


</div>
</div></div>
------=_Part_189595_1995163166.1503220308862--