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Name: Doug Moe
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: Around 1995


Question:
I was wondering what effect the newer type of computers, such as Pentium's and so forth will have on radio's, since FM uses from 88 mhz to 108 mhz; and these computers are running at 60 - 90 mhz. It is certain that they will get even faster, too.



Replies:
Good question! I would never have thought about it. But you can be sure that the designers of the computers have. All telecommunications equipment (as well as computers) fall under the scrutiny of the Federal Communications Commission ((FCC). Before a new product can be sold it has to be proven that it will not interfere with normal radio/communications broadcasts (the full band of communications). You may find that if you place a receiver very close to your Pentium you pick up a little additional noise -- I am not sure what the exact FCC requirements are. Remember that the 88 (to 108) MHz specified for broadcast frequencies are the CARRIER frequencies. Any signal you pick up on your receiver would be at a frequency that is the difference in your computer's clock rate and the carrier frequency. Since we are unable to hear sounds at frequencies more than (about) 20,000 Hz there would only be one (narrow) band on your radio where you would pick up signal -- assuming your computer has a stable clock. With TV the signal bandwidth is nearly 5 MHz, but again you should only impact one station (if at all). The interference would probably show up as vertical, moving, lines on your TV screen.

Let me re-iterate. The FCC requires certification of new computer products to avoid any major problems. You SHOULD see no effect.

G Bradburn


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