I was hoping that someone could explain how XM Satellite radio wiring works a bit. Specifically XM's satellite radio box uses Ground, Audio Common, and Drain Wire is shown in the Connector Terminal Identification section of the manual. Ground has bunch of noise from the all the automotive electronics, making it seem like it would be impossible to get clean audio into the radio. Which leaves me to believe that the "Drain Wire" and "Audio Common" are used in some way to produce a clean audio signal.
Thanks for your time!
Thanks for your time!
A couple of notes...
If you're using this with a car head unit, there is no audio common. For most all head units, the output channels are bridged with both wires at 6v.
If the noise is the same on the common AND the signal lines, the input circuit may allow the noise to cancel out.
If the noise is only one one signal OR common, an ultrasonic filter may remove the noise.
If the noise is ultrasonic, it may not be an issue.
If you're using this with a car head unit, there is no audio common. For most all head units, the output channels are bridged with both wires at 6v.
If the noise is the same on the common AND the signal lines, the input circuit may allow the noise to cancel out.
If the noise is only one one signal OR common, an ultrasonic filter may remove the noise.
If the noise is ultrasonic, it may not be an issue.
Well you're wrong... look at the images.
Anyway, I was able to figure it out. Has to due with a PICO Fuse filtering out GND and Audio GND
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