Digital Audio Noise from the Headphone Jack

I have been searching for a while to see if anyone else has this problem.
I have random faint digital noise (bleeps, bloops, and whirls) from my headphone jack. This happens regardless of application. I can get it going good by just tossing the volume bar back and forth on the sound pref panel.
I have considerably less of this from the line out but still detectable noise.
I have disconnected everything non essential from the Mac Pro and my power outlet are reduced to a minimum. (monitor and Mac)
I have tried numerous headphones including Etymotic ER•6 and Sony MDR-7505.
This has always been present in 10.4.7 and 10.4.8. Like I said, its faint in volume - but it gets annoying!
I have read the following below and believe these do not apply to me because this is not an external powered device.
Power Mac G5: I hear buzzes, beeps, or humming
http://docs.info.apple.com/article.html?artnum=86523
Macintosh: Solutions for noise in the audio signal
http://docs.info.apple.com/article.html?artnum=86655
Thank you!
2 x 2.6 GHz Mac Pro   Mac OS X (10.4.8)   1 GB original RAM

I found out today what is causing the noise on my Mac Pro!
Our next door neighbor has a really high power HAM radio that I am picking up static and transmissions from. I thought I was going insane when I heard weird voices coming out via my headphones. I know it is our neighbor because I heard him relay his name and location. Had to get my wife to listen to prove I was not going crazy.
Here is the weird thing. I do not have AirPort or BlueTooth on the MacPro...so I cannot figure out how the transmission is permeating the Mac. Could it be a shielding issue on some internal component?
Thanks!
Mac Pro 2.66   Mac OS X (10.4.9)   4GB / 1TB

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