Date: Sun, 20 Aug 2017 18:39:56 -0400
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: VLF: Carrier on 4470.005 Hz!
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> Is DL0AO ready for an EbNaut test on 4470.005?=20

Yes, go ahead...

73, Markus

-----Urspr=C3=BCngliche Mitteilung-----=20
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 20. Aug 2017 22:23
Betreff: Re: VLF: Carrier on 4470.005 Hz!


A very clear and stable trace at DL0AO, about 16 dB SNR in 31 uHz.

 Anything on Pauls RX?

 Is DL0AO ready for an EbNaut test on 4470.005?=20

 73, Stefan

 Am 19.08.2017 14:59, schrieb DK7FC:=20
...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!
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<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;">&gt; Is DL0AO ready for an EbNaut test on 4470.005? <br>=
<br>Yes, go ahead...<br><br>73, Markus<br><br>-----Urspr=C3=BCngliche Mitte=
ilung----- <br>Von: DK7FC &lt;selberdenken@posteo.de&gt;<br>An: rsgb_lf_gro=
up &lt;rsgb_lf_group@blacksheep.org&gt;<br>Verschickt: So, 20. Aug 2017 22:=
23<br>Betreff: Re: VLF: Carrier on 4470.005 Hz!<br><br></div>
<div id=3D"AOLMsgPart_2_d8e13d45-7276-4712-b387-bbfb97c72519">
<div class=3D"aolReplacedBody" text=3D"#000000" bgcolor=3D"#ffffff">
A very clear and stable trace at DL0AO, about 16 dB SNR in 31 uHz.<br>
<br>
Anything on Pauls RX?<br>
<br>
Is DL0AO ready for an EbNaut test on 4470.005? <br>
<br>
73, Stefan<br>
<br>
Am 19.08.2017 14:59, schrieb DK7FC:
<blockquote cite=3D"about:blank">
 =20
...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-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html" target=3D"_bla=
nk" rel=3D"noopener noreferrer">http://www.iup.uni-heidelberg.de/schaefer_v=
lf/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>
</blockquote>


</div>
</div></div>
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