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
the Alaska screenshot looks pretty similar to what came in here on 20.5 kHz today:
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!
Sent: Wednesday, December 25, 2013 4:53 PM
RJH6X 20.5
Heres a snapshot/cut paste as seen here at around 11z from here in Alaska
http://kl7l.com/RJH6X.jpg
From: [email protected]
To: [email protected]
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
Sent: Wednesday, December 25, 2013 1:19 PM
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
