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Bwanna can you check into this.

Started by Dan/Panther, October 20, 2009, 12:27:48 AM

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Dan/Panther

Are the two voltages sent out of phase to each other, or do they just not interfere with each other ?
D/P

The More People I meet, The More I Love, and MISS My Dog.  Dan Robinson

Phonesrfun

Well, I guess the short answer is that they just don't interfere. 

DC is constant, so it has no phase. 

Even the AC voice frequencies that are created by talking into the transmitter and the AC sounds you hear over the phone line ride "on top" of the DC current, so even they are superimposed over the DC.  Kind of hard for me to explain it.
-Bill G

bellsystemproperty

You've seen the picture of my lineman phone with the two nails, red and green. I can put the alligator clip on either nail and it works fine, so they're not polarity sensitivite. Every time the phone rings and I am close I run over to plug the alligator clips to the live nails and I just randomly put the clips on either nail and it works. Hopefully I won't Westinghouse myself.

Tonyrotary

Pretty amazing that the telephone actually uses AC and DC voltage at the same time.