Re: LF: ZEVS

[Markus Vester <markusvester@aol.com>]

Hi Edgar,

to say the truth, I don't know for sure. Eddie G3ZDO used to monitor ZEVS regularly, and a trace was present in June 2016: http://www.g3zjo.talktalk.net/vlfgrabber.htm . On the other hand, Renato's live grabber http://www.vlf.it/cumiana/livedata.html currently shows nothing on 82 Hz (scroll down to "Marconi Antenna + Geophone" ). Last time I looked myself was Sep 2014, and ZEVS was easily captured then on an E-field antenna with a simple FET source-follower.

The classic Stanford paper http://www-ee.stanford.edu/~acfs/82Hz.pdf mentions a fieldstrength measurement in Dunedin, New Zealand at -141 dB A/m (including a 1.5 dB correction for RX antenna orientation), and 13 dB SNR with 2 minute averaging. Assuming E/H = 377 ohm, the fieldstrength would be equivalent to E = 34 uV/m. It may be slightly weaker in Tasmania due to less focussuing gain further from the antipode.

Good luck if you want to try the experiment, I'm curious to learn wether you can find ZEVS down under!

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: edgar <edgarjtwining@virginbroadband.com.au>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 21. Jan 2017 11:06
Betreff: LF: ZEVS

Is the Zevs transmitter active?

Regards, Edgar
Moonah,Tasmania.