Noisy fluorescent lights

Here is an example of fluorescent light RFI; thought to be RF quiet, but in reality far from amateur radio friendly.  Even though the observed noise on the radio was low, this is an example of “just another” noise source adding to the overall rise in the noise floor.     Key words: Fluro lights

Read More

Tracking and resolving Garage Door Controller noise – noisy PSU

Another noisy garage door causing havoc on HF. A  group of hams decided to use QRM guru to help with some unknown RF noise.  Using the DF Loop the garage door opener was found to be the cluprit The garage door controller was removed and taken to the workshop for further analysis. Model Herculife RDO-V12   […]

Read More

Tracking and resolving Garage Door Controller noise – software setting

Thanks David, a VK3 amateur for this article. Like many amateurs, I live on a suburban block surrounded by local neighbourhood RF hash.  My noise level on 40M was typically S9 plus with crackling interference. In the past the basic checks were completed, LED lights, solar inverter etc and without any real conclusion, I became convinced […]

Read More

MFJ-1025 Noise Cancelling Signal Enhancer

Craig VK3MET demonstrates the effectiveness of MFJ interference cancelling technology that uses a sensing antenna to suppress interference by introducing an out-of-phase sample signal. Such tools can prove very effective in some situations.  In ths case the noise cancelling technology is suppressing what is most likely a plasma TV noise source. (disclaimer: neither the author, […]

Read More

Locating Power Line Noise

The below videos give a real world example of power line noise suffered by Allan VK2CA.  The second video shows first hand how you can use a simple VHF/UHF receiver to narrow down the offending power pole.   QRM.guru thanks Allan for providing these videos.     This video illustrates first-hand the horrible sounds that […]

Read More