Need help with RFI on 20 Meters

  • 1
  • Problem
  • Updated 3 years ago
  • Solved
Only on 20 meters and only with antenna connected.  I have a dipole, so I cannot null the noise. Strongest source seems to be a -40DB carrier with broad band noise at -90 DB on 13.560 MHz. There are other peaks as follows:
MHz           -DB
14.408        108
14.195        108
14.117        106
14.063        105
13.984        106

Screen shot of the worst:



At 14.117 MHz,  zoomed in max. major spikes at about 170 to 180 KHz



On one occasion I saw this:



And for comparison, no antenna connected:



So...my questions:

1. Any one recognize this as a common source of RFI?

2. How do I track it down?

3. I would like to log this with an Arduino 24/7.  Any suggestions as to how?
    ( I have done Arduino projects, have RTC.  Maybe rectify spkr. output and read analog          voltage?) or is there a convenient output on the 6300?

note: Utility wiring is underground.  I have disconnected household suspects.

Any and all help appreciated!
Photo of butch alline

butch alline

  • 38 Posts
  • 9 Reply Likes

Posted 3 years ago

  • 1
Photo of butch alline

butch alline

  • 38 Posts
  • 9 Reply Likes
Official Response
Thanks for all the input guys!

Problem solved in house.  Found an unused and defective Linksys wall wart behind a sofa.

I used a wireless headphone to listen to the radio audio as I walked through the house.  
I then found one circuit breaker that killed the buzz when the breaker was turned off.  
Then I went to each receptacle on that breaker and finally found the culprit.

Wireless 900 MHz headphones are very useful for TV, Stereo and now RFI hunting!  They are available on eBay for about $30.