RE: LF: VLF

["hvanesce" <hvanesce@comcast.net>]

Markus and Laurence,

 

Thank you, your comments and screenshots are very helpful.

 

Yes, the signal was at 20.5kHz. I talked myself out of taking a screenshot until I realized the signal was long gone, then found out that I don’t know how to extract data from Spec Lab buffers, or properly set up the buffers.

 

I have accordingly taken the bold steps of (a) downloading the Spec Lab manual, and (b) starting to read the manual. I am accustomed to the traditional manual style in which all references are circular, compliments to Wolf for breaking tradition.

 

I did not notice a dishwasher signature, but will know what to look for next time.

 

Thanks very much to all, next time I will have pictures.

 

73, Jim AA5BW

 

 

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Markus Vester
Sent: Wednesday, December 25, 2013 10:41 AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: VLF

 

Hi Laurence, Jim,

 

the Alaska screenshot looks pretty similar to what came in here on 20.5 kHz today:

http://dl.dropboxusercontent.com/u/26404526/vlfwide_20k5_131225_1726.png

 

The cursor for the spectrum plot was moved to the twin peaks around 10:39. Please ignore the complex, digitally looking patterns from 10:20 to 12:00 UT - it's not the railway but the microcontroller in my neighbour's dishwasher!

 

Best 73,

Markus (DF6NM)

 

 

 

From: Laurence KL7 L

Sent: Wednesday, December 25, 2013 4:53 PM

To: rsgb_lf_group@blacksheep.org

Subject: RE: LF: VLF

 

RJH6X 20.5

Heres a snapshot/cut paste as seen here at around 11z from here in Alaska

http://kl7l.com/RJH6X.jpg

---

From: markusvester@aol.com
To: rsgb_lf_group@blacksheep.org
Date: Wed, 25 Dec 2013 13:52:23 +0100
Subject: Re: LF: VLF

Hi Jim, what frequency is that, 20.5 kHz? Did you happen to take a screenshot? 73, Markus

 

From: hvanesce

Sent: Wednesday, December 25, 2013 1:19 PM

To: rsgb_lf_group@blacksheep.org

Subject: LF: VLF

 

While working on VLF receiver noise this morning (~1100 UT) in Arizona a 35dB S/N signal ~ 50Hz wide (somewhat rectangular) appeared on the RJH6x marker for a few minutes, then disappeared. It didn’t appear to be local noise; could it have been RJH6x? It was 20dB over NPM, which makes me think that it couldn’t have been too distant.

 

73, Jim AA5BW