|Subject:||Re: ELF: ZEVS reception from a small loop|
|From:||Markus Vester <[email protected]>|
|Date:||Mon, 25 Sep 2017 11:03:50 -0400|
|Dkim-signature:||v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1506351832; bh=/wQVNU7vidwmT5mhaZduSYk8AOqskR832eB9KC1C//c=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=ajk28aXZnU1v6SXEZw/Xgk4iwXqRS6h4eKOYwAzQ9RNP/tZ0j37akt7ZHYYXK0QVG zgZXTehK5GQ4zc0bqlxagwedhhFtyP1PIrVVIFtkOgjUMS+yIrUhgK04mb3U5p4Doh piVulQyBQeE5QW927md1KnaKyg5y88TcQHUVCjIs=|
that's a very nice result!
Have you also tried to look for Schumann resonances in the recording?
Instead of the 84 turns, you could probably employ a single turn loop with a transformer. So perhaps your antenna in the tree might receive ELF as well?
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Cc: Renato Romero <[email protected]>
Verschickt: Mo, 25. Sept 2017 15:18
Betreff: ELF: ZEVS reception from a small loop
Hi LF friends,
You know, a few weeka ago i've been in France. We had a field day and i tested my small loop with its new preamp. Description below.
>From a handy loop with just 0.8 m diameter and 84 turns i didn't expect much. However i saw my 4470.005 Hz carrier quite well even in 424 uHz FFT bandwidth which is not bad at all for 250 km distance. It even was a noisy day.
But now: I reprocessed the recording (which was done by the Raspi and vlfrx tools) again, looking for ZEVS on 82 Hz.
To my surprise ZEVS has a very good SNR from that small antenna! It was up to 25 dB in 3.8 mHz! That's the celarest signal i saw from ZEVS, so far. For the spectrogram i used a 1.5 kHz low pass filter and a noise blanker.
So my loop setup seems to be promising for the next 970 Hz experiment as well :-)
PS: The preamp design is taken from: http://www.vlf.it/feletti2/idealloop.html
Am 18.09.2017 00:56, schrieb DK7FC:
|<Prev in Thread]||Current Thread||[Next in Thread>|