It’s time again to play: Name That Noise Signal (Video7.wmv) more Amateur Radio RFI (Radio Frequency Interference)

For awhile last night it was quiet … I actually had very low noise levels on most bands. I could hear the RFI, which has a pulsing factor to it - but sounds like electrical noise, but it was not sustaining like it has at other times. I was actually able to hear and work stations on 3.8 and 7.2 Mhz portions of the ham bands. But today it was back again in full force. Although it doesn’t seem to be always holding the same 5 times per second (approximately) pulsing. I’d almost want to say it is a form of modulation or coding. Maybe it is based upon some kind of traffic or messages being sent? Maybe it varies with electrical usage somewhere? Maybe it’s a failure waiting to happen and it can’t quite figure out what to do with the cold temperatures we are experiencing.

Anyway I managed to get a recording again of this noise … I’m monitoring it right now on 3.8 Mhz and it doesn’t seem to have any reliable pattern to it. Sometimes it’s that rapid pulse, then it slows down to a steady electrical buzzing, different lengths of ON time, back to pulsing briefly, and then back to some longer steady ON times. One thing is for sure it won’t go away and play nice. And it’s very broad band. From AM BC band, through HF Ham Bands, and I can find it also up in VHF although quite a bit weaker.

Here is the video:

* If anyone, Ham Radio Operator, or other knowledgeable or expert type, recognizes this noise please let me know. Thanks! 

—
Alan Spicer KA4UDX
http://blog.marinetelecom.net

This entry was posted on 11. January 2010 at 04:23 and is filed under Main, Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response or trackback from your own site.