Date: Wed, 15 Feb 2017 12:45:48 -0500
From: Markus Vester <markusvester@aol.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: VLF: Antenna switching
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Hmmm Stefan, if unannounced transmissions can buy me precious East-West ant=
enna time, I guess I should revert to surprise operations as well ;-)) In m=
y opinion, the favoured solution would be to kick out NMEA and listen on bo=
th antennas simultaneously, with only 1pps superimposed on the right channe=
l.

Best 73,
Markus
 =20

-----Urspr=C3=BCngliche Mitteilung-----=20
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mi, 15. Feb 2017 15:21
Betreff: VLF: Antenna switching


Hello Markus, VLF,

My antenna switch works now. I wrote a small script (just my level of=20
skills, while loops and so on ;-) ) that allows tto switch from the=20
north-south loop over to the east-west loop to a certain time and then=20
back to another time.
The script is now tested the first time, i switched to EW since 14 UTC=20
and will be back on NS at 16 UTC. You can see the difference at=20
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
So, Markus, if you want to try a short EbNaut transmission soon in the=20
morning, just tell me the day before, then i can switch the antenna to=20
you just during the start of your transmission, while i'm still=20
sleeping. And then back into Uwes direction, who prefers unannounced=20
transmissions :-)
I als removed the grounding on the relay pin of the unused antenna,=20
which caused a coupling between the loops. Now it all should work well...

It opens new playing fields, e.g. testing an alternative E field antenna=20
on the second input. That will be a better choice for the 970 Hz=20
experiments...

73, Stefan
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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;">Hmmm Stefan, if unannounced transmissions can buy&nbsp;m=
e precious East-West antenna time, I guess I should&nbsp;revert to&nbsp;sur=
prise operations as well ;-)) In my opinion, the&nbsp;favoured&nbsp;solutio=
n would be to kick out NMEA&nbsp;and listen&nbsp;on both antennas&nbsp;simu=
ltaneously, with only 1pps superimposed on the right channel.<br><br>Best 7=
3,<br>Markus<br>&nbsp;&nbsp;<br><br>-----Urspr=C3=BCngliche Mitteilung-----=
 <br>Von: DK7FC &lt;selberdenken@posteo.de&gt;<br>An: rsgb_lf_group &lt;rsg=
b_lf_group@blacksheep.org&gt;<br>Verschickt: Mi, 15. Feb 2017 15:21<br>Betr=
eff: VLF: Antenna switching<br><br></div>Hello Markus, VLF,<br><br>My anten=
na switch works now. I wrote a small script (just my level of <br>skills, w=
hile loops and so on ;-) ) that allows tto switch from the <br>north-south =
loop over to the east-west loop to a certain time and then <br>back to anot=
her time.<br>The script is now tested the first time, i switched to EW sinc=
e 14 UTC <br>and will be back on NS at 16 UTC. You can see the difference a=
t <br><a href=3D"http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Gr=
abber2.html" target=3D"_blank">http://www.iup.uni-heidelberg.de/schaefer_vl=
f/DK7FC_VLF_Grabber2.html</a><br>So, Markus, if you want to try a short EbN=
aut transmission soon in the <br>morning, just tell me the day before, then=
 i can switch the antenna to <br>you just during the start of your transmis=
sion, while i'm still <br>sleeping. And then back into Uwes direction, who =
prefers unannounced <br>transmissions :-)<br>I als removed the grounding on=
 the relay pin of the unused antenna, <br>which caused a coupling between t=
he loops. Now it all should work well...<br><br>It opens new playing fields=
, e.g. testing an alternative E field antenna <br>on the second input. That=
 will be a better choice for the 970 Hz <br>experiments...<br><br>73, Stefa=
n<br><br><br></div>
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