Re: VLF: Antenna switching

[Markus Vester <markusvester@aol.com>]

Hmmm Stefan, if unannounced transmissions can buy me precious East-West antenna time, I guess I should revert to surprise operations as well ;-)) In my opinion, the favoured solution would be to kick out NMEA and listen on both antennas simultaneously, with only 1pps superimposed on the right channel.

Best 73,
Markus
  

-----Ursprüngliche Mitteilung-----
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
skills, while loops and so on ;-) ) that allows tto switch from the
north-south loop over to the east-west loop to a certain time and then
back to another time.
The script is now tested the first time, i switched to EW since 14 UTC
and will be back on NS at 16 UTC. You can see the difference at
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
morning, just tell me the day before, then i can switch the antenna to
you just during the start of your transmission, while i'm still
sleeping. And then back into Uwes direction, who prefers unannounced
transmissions :-)
I als removed the grounding on the relay pin of the unused antenna,
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
on the second input. That will be a better choice for the 970 Hz
experiments...

73, Stefan