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Conference hips::uk_audioo

Title:You get surface noise in real life too
Notice:Let's be conformist
Moderator:GOVT02::BARKER
Created:Thu Jul 28 1988
Last Modified:Mon Jun 02 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:550
Total number of notes:3847

300.0. "Noise on FM from a CD Player?" by SIOG::POCONNELL (Godot's been and gone!) Fri Aug 02 1991 14:38

    I noticed the following problem recently. 

    [set-up consists of:
    Technics Cassete (can't remember the number) on unit top
    NAD 7125 Receiver
    DENON DCD 1700 CD
    Stacked in that order (Denon at the bottom) on shelf under
    unit top
    with DUAL 505 beside the Technics
    Speakers B&W 220]

    When I switch to FM on receiver while the CD is still powered
    on I get 'noise' on the FM signal. Power off CD, Noise
    disappears; power on CD the noise returns.

    I removed the receiver from the CD player and placed it under
    the tape deck on the unit top; no improvement.

    Do I have a problem with signal leads and power cables or is
    the power supply in the Denon doing nasties?

    Help appreciated.

    Pat. 

T.RTitleUserPersonal
Name
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300.1A common fault ?WIKKIT::WARWICKTrevor WarwickFri Aug 02 1991 18:487
    
    I have exactly the same problem. I have a Mission tuner, and I notice
    interference on the signal with my current CD player (Arcam), and with
    my previous one (Phillips).
    
    
    Trevor
300.2WOTVAX::HARRISCNot very nice at allFri Aug 02 1991 18:497
    Re -1
    
    This is probably due to the CD giving off signals that the tuner is 
    picking up..  Shouldn't be a problem though, when do you play a CD and
    listen to the radio?
    
    ..Craig
300.3ASICS::EDMUNDSstrange magicFri Aug 02 1991 19:021
    When (ahem) taping a CD?
300.4screen one from the otherSKIWI::EATONMarketing - the rubber meets the skySun Aug 04 1991 04:374
	Do you have an internal or external aerial ?

	You could always try the old trick of screening one component (CD)
	by using an aliminum plate which you can eart.
300.5IOSG::HORSFIELDGee, darling, is that Darjeeling? infused Earl Grey, teasinglySun Aug 04 1991 09:347
	you could try changing the stacking order.

	fwiw, i have a pioneer old, cheapo tuner sitting on top
	of a Denon 1500 Mk2 CD - no problems


	jack 
300.6thanksSIOG::POCONNELLGodot's been and gone!Tue Aug 06 1991 10:029
    Thanks for the suggestions. I visited our local Audio 'Consultancy'
    (you know, fancy surroundings, fancier prices) and his considered
    opinion was that the DACs in the CD were causing the problem. He
    claimed that the problem is worse again with the high-end transport/DAC
    separates. What was his suggestion? Switch off the CD when listening to
    FM (BTW the signal comes from the local cable company and for the most
    part is only barely acceptable)
    
    Pat
300.7If all else fails, try the sheel of aliminium.SKIWI::EATONMarketing - the rubber meets the skyTue Aug 06 1991 22:432
At least he didn't suggest that the problem would be solved by the purchase of
a high-end CD...
300.8KERNEL::HUDSONthat's what I thinkWed Aug 07 1991 10:119
    re: .0
    
    I used to have a similar problem with my CD/Tuner, but it disappeared
    when I installed an exterior FM aerial on the roof.  Previously my
    aerial had consisted of a bit of wire sellotaped along the wall of the
    lounge.  So perhaps the problem is proximity of CD player to aerial,
    rather than the tuner itself?
    
    nick
300.9VOGON::ATWALMaybe a Sun reader could tell us more...Wed Aug 07 1991 12:179
I've had a similar problem when placing a Sony personal CD player near a TV set,
resulting in a lot of noise/fuzzy picture on the TV (which has a rooftop aerial
mounting).

I just stopped using the CD when the TV was on. Do full size CD players also 
cause this effect?


...art
300.10Strange ain't it ?SKIWI::EATONMarketing - the rubber meets the skyWed Aug 07 1991 23:261
Funny, I haven't had the same problem with my record player ;-)
300.11my 2p worth....BAHTAT::SALLITTFri Aug 09 1991 11:1113
    I have my tuner on the shelf above my CD player, with only about 1.5"
    space, and I don't have a problem with interference. But I also have a
    roof aerial which gives a nice big fat signal into the tuner.
    
    If .0 is only using the giveaway aerial that comes with most items, not
    only will it be ideally placed to pick up the rf gunge from the CD
    player, the aforesaid gunge will only have to compete with a feeble
    wanted radio signal.
    
    Whether or not the CD is only turned on when required, a good rooftop
    aerial is a wortwhile investment.
    
    Dave