Conference cookie::notes$archive:cd_v1

    
    Anything's possible.  I've picked up CB calls from my *turntable*
    while taping in the past and currently someone in my neighborhood
    has some RF-generating device that causes a tape deck hooked up
    to an amplifier in my basement to pick up blasts of static!!!  (This
    static also affects my TV, AM/FM reception and my guitar amplifiers!!!)
    
    

It seems more likely that your tape deck is the culprit.  Tape
decks contain slope detection circuits (read: FM demodulators)
in the biasing sections, and they contain a little antenna (the
heads) as well.  It is however possible that your CD machine may
also have similar circuits (to control the laser servoes &
such).  The plastic face of the Maggie does make a pretty good
wave guide too.

Try sheilding various components with tinfoil (don't block
ventilation or short any electrical components) to see what
happens.  You might also try rotating the various components to
see what happens.

This problem happens a lot in Boston too.

                A very likely cause (and impossible to either prove or
        track down) was somebody (police, taxi, delivery company, etc.)
        was near your house and transmitted (I know that wasn't what you
        heard - but bear with me).
                
                What happens here is the unknown transmitters signal
        mixes with a standard FM broadcast signal producing additional
        signals, one of which fell into a spot that something in your
        system in the signal path from CD to tape picked up. This
        phenomenon even has a name when applied to radio gear, it's
        called intermod (short for intermodulation products).
                
                To sum it up, unless it happens frequently, it isn't
        something to be concerned about in any way.
                
                /s/     Bob

As an addendum to .3, please note that your CD player
(or tape deck or smoke detectors or microwave etc.)
might be the transmitter of the signal that FM radio
may beat (and therefore heterodyne down).  Any thing
with a crystal oscillator which isn't well shielded
will broadcast to some extent.  [That's why the FCC
gets to approve computer hardware.]

Note again that if the signal you were hearing was
FM, you still need a circuit to decode it (unlike AM).
Tape decks certainly have such circuits, and CD players
probably also do.

I guess that I can add this to my lists of reasons why
I like solid metal packages on my electronic gear.

Wow!  This is all very interesting.  But I'm not going to run out and buy the 
Philips player yet!  For one thing, it's pretty ugly compared to the CDB465.

I remember a humerous incident when I worked for The Glass Harmonica in 
Bloomington IN.  CB's are very popular out there, and the pick-up-truck types 
would come in from the boonies on Sundays after church service to try to find 
some arbitrary classical records.  One Sunday, this guy came in who didn't 
like classical at all, so he went back to the car while his wife was in the 
store shopping.  His pick-up was right next to the front window of the store.  

Before we knew what was going on, we stopped getting music out of the speakers 
(the turntable was the source), and started picking up a VERY dirty CB 
conversation he was having with his mistress!  At TOP VOLUME!  The wife's 
face turned crimson, she ran out of the store, and that was the last we saw 
of that couple!


				Mark

    I used to work for a company that made cash registers for the fast
    food industry. We used to have problems with drive through equipment
    when those pick-up trucks with their KW CBs came through.
    
    It took a lot of careful shielding of equipment and cables (including
    power filtering) to solve the problem. And that was digital and
    a lot less sensitive to electromagnetic interference than audio
    stuff.
    
    Les