Chasing down interferance
I've been using my antique radios lately, and it had got to the point where AM was nearly unusable, due to buzzing and interferance.
I located the noise sources by shutting off one breaker at a time, until it went away. I ended up finding one grey market LED lamp, the treadmill, and the power supply to the Wii U. I also unplugged the computer. With all that done, reception is awesome now. If you're struggling with am reception, keep trying, it is possible to get it back. I can get stations which have been lost in noise for years, and the sound is good now. |
I need to go on such a hunt soon. Lately, something has been intermittently interfering with the agile modulators I use to transmit to my TVs.
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What does the interference look like? |
I'm an AM DXer. I found that my CPAP would make noise running and a power brick for my son's laptop would make weird noises. Interference looks like lots of dashed lines in motion.
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Zenith had a device they called "the growler" for testing analog TV sync circuits. It was a metal box with RF input and output ports that contained a vacuum cleaner motor coupled to the signal. It had a two stage speed control circuit that cyclicly varied the speed of the motor and the rate of change of the speed, thus creating interference streaks that ran through all possible phases with respect to vertical and horizontal sync. Eventually, integrated analog sync circuits could sync up when the signal was so much smaller than the noise that you could not make out what the picture content was. |
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A buddy of mine was fond of complaining about how bad the RF interference is in town. 75-40 meters was basically unusable and 20 was pretty rough too. We got a battery for the radio and starting flipping breakers. Turned out he was generating most of the noise! He had all sorts of stuff that was interfering. Got most of it dealt with but he still likes to complain about "the noise in town".
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I once had an RFI problem that made SW listening unbearable. Located the problem at a street light with a bad sensor across the street. Got the city to change out the sensor and the problem went away!
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The FM reception is great when the lights aren't on. :scratch2: |
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