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RFI help stop the insanity

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  • Geoff Millar
    commented on 's reply
    Thanks Bill, we have a Dyson stick vacuum which doesn't seem to produce the same noise through the receiver, however, its loud 'hissing ' noise also gives me the 'toms' (British rhyming slang).

    Geoff

  • billfitzmaurice
    commented on 's reply
    For sure, especially since Hendrix favored single coil pickups rather than humbuckers. When I was a teenager my band used to practice in a house within sight of radio transmitter towers. When our instruments were turned up the radio was always there in the background. Turning off the instrument volume controls or unplugging the instrument cords from the amps got rid of it.
    The noise from the vacuum is probably from the motor brushes. Time for a brushless cordless vacuum. I just got one, and it's so easy to grab and go that I use it almost as much as I should.

  • Geoff Millar
    replied
    Sort of related: when I'm listening to anything on our system, and the vacuum cleaner is going, there's a high pitched whine/whistle through the speakers: presumably there's something going into our Yamaha RX-596 receiver from the motor in the cleaner? As soon as the vacuum stops, the noise stops.

    As an observation about the RFI issue, Jimi Hendrix' Isle of Wight concert in 1970 was plagued by local walkie-talkie conversations coming through his amps - same problem, perhaps?

    Geoff

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  • fpitas
    replied
    But with all that compression, more songs can fit in your head

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  • davidB
    replied
    'Havana Syndrome' - when an otherwise good, but overcompessed pop song gets stuck in your head.

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  • fpitas
    commented on 's reply
    Yes, some stations have enormous power, and if you're unfortunate enough to live near them you often get to hear them, like it or not.

    Also, some amplifiers do not tolerate RF well on the inputs or outputs. The RF gets rectified and amplified.

  • djg
    replied
    https://www.reddit.com/r/todayilearn...radio_station/

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  • DeZZar
    replied
    ^
    ha!

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  • 129Decibel
    replied
    Looks like the speaker cable was the problem all bunched up and twisted separated the L R and C channels and the station went away just the slight buzz from the carvers. Also had two old sub woofer speaker wires in the wire jacket removed those, going to shorten all the wires then but them back in the jacket. Sound great again thanks for the help.

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  • Steve Lee
    replied
    ^
    ha!

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  • billfitzmaurice
    replied
    Disconnect the speaker cables at the amp. If they're what's picking up the RFI the sound won't go away. Considering the voltage level required for said airborne RFI to be audible through the speakers I wouldn't want to be in that house for fear of Havana Syndrome.

    Leave a comment:


  • DeZZar
    replied
    Originally posted by DeZZar View Post
    If you move your speaker cables around during this interference does it change at all?
    Originally posted by billfitzmaurice View Post
    Speaker cables aren't the problem..
    Originally posted by 129Decibel View Post
    30 ft speaker cable, ...left is closest to the amp so there is bout 9ft of extra wire the L is the speaker with the loudest RFI..
    Originally posted by billfitzmaurice View Post
    ...if you've got that extra nine feet of wire coiled that coil is a pair of series inductors, which could conceivably be causing back EMF.
    ¯\_(ツ)_/¯.....like, its a two second experiment to eliminate the possibility...

    Leave a comment:


  • fpitas
    replied
    Originally posted by Mike C View Post
    "Clamp-on ferrite cable beads may help, too."

    Wrapping the cable around the core and then snapping it closed works better than just
    clamping it on the cable.
    True, if the bead opening is large enough. If not, you can also use a bunch side-by-side.

    Leave a comment:


  • Mike C
    replied
    "Clamp-on ferrite cable beads may help, too."

    Wrapping the cable around the core and then snapping it closed works better than just
    clamping it on the cable.

    Leave a comment:


  • fpitas
    commented on 's reply
    Clamp-on ferrite cable beads may help, too.
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