From: Ian Liston-Smith <ian.ls@...> Sent: 20 July 2020 13:00 To: VLF group <vlf_group@...> Subject: NASA Inspire VLF-3 receiver Looking at the NASA Inspire 3 VLF receiver, I'm puzzled at what the func

Paul, from the signals you have received so far, what is your estimation regarding the ERP (not the EMRP) of DL0HOT? My estimate was 7 dBm. I think the effective height of the antenna is 30 m (my esti

Hi VLF friends, There was a first EbNaut test transmission from DL0HOT last night. The QRN levels were high but maybe someone can catch it anyway. *f = 8270.01 Hz Start time: 03.August.2020 20:00:00 U

This afternoon, DFCW greetings from DL0HOT were received in 3.8 mHz spectrograms at DK7FC and DL0AO. 73, Markus

Looks like https://omniweb.gsfc.nasa.gov/vitmo/cgm.html can provide that. You provide the "Starting Point" and in the next section ask for the conjugate point information that you want. Dennis

Hello group I have searched for a simple online calculator that would give the geomagnetic conjugate point for a given receiver site. So far no luck. Found a neat looking site (http://www.geomag.bgs.a

Much appreciated Shawn! Dennis

Both being wet and JFET robustness are both fair observations…he says as thunder rolls across his local countryside. Did I say I had nothing to do with the current design? Even that could be for the b

Both SAQ transmissions on 05/07/2020 well received in West London despite storm. Details about reception and station setup can be watched at https://www.youtube.com/watch?v=tKZFpDfUwVU&feature=youtu.b

Hi, I am new to IO group and becoming fascinated by the world of vlf Signals and phenomena. I've managed to get my sound card set up as a VLF receiver, but because my knowledge of practical electronic

More info here: https://alexander.n.se/alexanderson-day-2020/?lang=en Johan

Excellent copy of SAQ this morning in JN45sl, using the Roelof's mini whip (thanks !). All the details here : http://saq.weaksignals.com Also the complete audio can be heard from that page. Anyway thi

Hi VLF, Yesterday i visited the operators of DL0HOT at their TX site. They have a large T antenna with 1.4 nF capacity at up to 40m above the ground. Their coil for 8270 Hz is heavy and they currently

I have read how Stanford and other groups are using vlf to detect precursors to earthquakes by receiving vfl radio signals. These signals are thought to be caused by changing strain on piezoelectric m

I am interested in attempting transmission at 8 khz. I understand extreme stability is needed in frequency to operate qrss. A question: is a crystal oscillator at 8 mhz using a digital frequency divid

https://www.youtube.com/watch?v=XR28BOmktwE ...in German language, by DF6NM and DF9RB. A great overview, also the historic mile stones of VLF amateur radio... 73, Stefan

Hello Alberto, Thanks for the interesting information. Where do we find more informations? What is the exact location? Is it on the hill we can see on the image on the top of the website? A very very

Looking onto DL0AO and DK7FC grabbers, I happened to notice fuzzy stripes with 0.183 Hz spacing, resembling the spectral signature of a WSPR-15 signal. Checking WSPRnet indeed showed 17 (!) decodes fr

Oops...forgot to put the date in May 25, 2020. 0355:19.5162 UTC

Is it possible for vtrtlsdr in the vlfrxtools kit to do direct sampling? I know there are other Linux solutions, I would like though to stay with the vlfrxtool kit functionality. S. Shoemaker Mobile