AW: Re: VLF: 8270.000 Hz and forest VLF grabber preparations...DONE..

[uwe-jannsen@kabelmail.de]

sri. the TX has been switched off. it is snowing.
until better wx.
Uwe/dj8wx

 

Von: DK7FC <selberdenken@posteo.de>
Gesendet: 17.02.2016 21:49
An: <rsgb_lf_group@blacksheep.org>
Betreff: Re: VLF: 8270.000 Hz and forest VLF grabber preparations...DONE..

 

Uwe,

You will get some more receivers!
My idea to install a VLF rx system into the tree proceed faster then i thought :-)

Am 15.02.2016 22:03, schrieb DK7FC:

More news: I managed to run 2 soundcards on a Raspberry Pi 2B. They are streaming simultaneously. I will install this on the tree in the forest. So one is stereo and for the 2 MF loops, the other one will be mono and for VLF and will run on request or when there is plenty of energy reserve. I will try to install an actice E field antenna there. Experiments in the past have been very promising!

That was 2 days ago.

Yesterday i prepared the soundcard so it can be "unpluged" and "pluged" by a GPIO pin. The soundcard consumes 19mA at 5VDC. Not much but why not adding this feature, so i can save energy if VLF is not running.
See https://dl.dropboxusercontent.com/u/19882028/VLF/VLF%20soundcard%20switchable%20by%20GPIO.jpg

Today in the morning i tested the loop in the office and later in the afternoon i installed both on the tree.
https://dl.dropboxusercontent.com/u/19882028/VLF/Hule%20Hup%20VLF%20loop%2021m%20up.jpg

The loop is pointing N-S, i.e. in your direction.
There will be a VLF forest grabber soon. It is also a big advantage for my next local VLF transmissions because i can observe the signal in 3.5km distance which is still the near field but far away to overload the ADC...

Thanks for your transmissions. So far for now from here :-)

73, Stefan


Am 17.02.2016 17:54, schrieb uwe-jannsen@kabelmail.de:

OK, Paul.
Stefan, it was neither GI nor Ni.
you get some more opportunity:
carrier is on.
message:
start 2016-02-17 18:00:00
same settings but::
repeat on hour until the wx gets too bad.

Uwe/dj8wx