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Thread: Mobile phone interference

  1. #1
    Join Date: Nov 2010

    Location: Chorley, Lancs

    Posts: 1,948
    I'm Mike.

    Default Mobile phone interference

    While listening to some LP's this afternoon i noticed when i approached the turntable that i was picking up interference from my phone and the closer my phone was to the cartridge the louder the interference, has anyone else noticed this with their gear?


    As the late Colonel Sanders once said
    "I'm too drunk to taste this chicken!!"

  2. #2
    Join Date: Aug 2009

    Location: West Yorkshire

    Posts: 1,534
    I'm Stephen.

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    Although not quite the same as the “mobile effect” you describe I get a similar interference/hum when using my Decca Super Gold when I approach/lift the arm. Not massive but audible. In my case I seem to be inducing a ground loop because if I earth myself by touching a grounded piece of kit or the rack (also earthed) there is no interference/ hum.
    I know these cartridges have a reputation for hum but this is the only situation that mine does.


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    Last edited by worrasf; 26-05-2019 at 07:45.
    Always a little further

  3. #3
    Join Date: Jan 2009

    Location: Sheffield - UK

    Posts: 6,473
    I'm Mark.

    Default

    Both of the issues described are quite common. In Mike’s case it is the phonostage that is the cause and is quite common and some stages seem very much more sensitive to this issue than others. Weirdly, despite the active amplification stages being housed in largely plastic cases, my own stage seems quite immune to RF breakthrough.

    The problem Stephen describes is a different problem altogether and relates to the tonearm grounding. In the past I have found it is down to whether the headshell/arm tube are grounded.

    100% Analogue

  4. #4
    Join Date: Nov 2010

    Location: Chorley, Lancs

    Posts: 1,948
    I'm Mike.

    Default

    it was weird as i'd left my phone near to the TT then in between tracks i heard what i can only describe as "that mobile phone noise" as it happened in between tracks and i didn't realise that i'd left my phone so close i thought it might be something on the LP, but soon worked out the culprit


    As the late Colonel Sanders once said
    "I'm too drunk to taste this chicken!!"

  5. #5
    Join Date: Apr 2016

    Location: Gravesend and France

    Posts: 1,234
    I'm paul.

    Default

    I used to get a bleeping signal through the speakers in my car when the phone was near the radio, radio wasn't even turned on.
    Sony STR 6055 Denon DP80 Stax UA-70 Shure Ultra 500 in a Martin Bastin body with jico stylus Lii audio fast 10 tqwt

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    Garage system another Sony receiver, cassette deck and Lii audio crystal 10


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  6. #6
    Join Date: Nov 2016

    Location: North East England

    Posts: 538
    I'm Mick.

    Default

    I had a similar problem when I used an Angle Audio phono stage. Seemed to pick up all sorts of noise dependant on where it was placed.
    Technics SL1210 MK2 fully rebuilt and repainted. Ortofon 2M Black Cart, Isonoe isolation feet , MN bearing and Funk Firm platter upgrade, Oyaide RCA Tone Arm and speaker cables, Jelco SA-750D Tonearm. Oyaide HS-TF Carbon headshell, MCRU Linear External PSU, High Fidelity Crystal glass turntable matt, Blue LED upgrade, Denon AVR-2808CI Amp, Bowers and Wilkins DM602S3 Speakers,
    Black Rhodium Jazz power cables for amp and turntable, Firebottle mk2 Phono Stage.

  7. #7
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 56,685
    I'm Grant.

    Default

    Could try some ferrite cores. But easiest way is to keep phone away. Older 2g was the worst offender
    Regards,
    Grant .... ؠ

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  8. #8
    Join Date: Sep 2017

    Location: Dublin

    Posts: 263
    I'm Pavel.

    Default

    It seems different components have different degree of sensitivity to mobile phone interference, I used to have a DAC that was bleeping mercilessly when a mobile phone was in the same room. I later had a battery-powered phono stage that was also heavily affected, perhaps because it was not really earthed properly.

  9. #9
    Join Date: Jan 2009

    Location: Essex

    Posts: 20,457
    I'm openingabottleofwine.

    Default

    Yes it does depend on the phonostage. With a previous system I had breakthrough from a taxi radio parked outside my house (a couple of ferrite beads on the leads inside the unit, just behind the phono input sockets cured it).

    I have noticed mobile phone carrier signal breakthrough on some plastic-cased head amps I have tried.

    I response to your post I padded over to my TT and placed my mobile phone as close to the cartridge as possible (a low output Ortofon MC), turned the volume up to my normal listening level - and heard nothing. So I'm quite satisfied with the interference rejection of my preamp/phonostage (Mark Levinson ML25/28).
    Barry

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