Electronics > Beginners

Oscilloscope doubles as radio station!

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testtube44:
Last year I got the DSO5202P 200Mhz digital oscilloscope as a present for finishing the school year. I like it alot, and am excited to learn how to use it. But recently I discovered a strange issue. I have an old alarm clock (90s) that has an AM and FM radio built in, today I was doing some experiments with it and discovered that the radio background goes dead silent at somewhere around 108Mhz when I turn it on. When I tuned slightly up or down from there, a very loud buzzing is heard emitting from the scope. This is a big deal and the field extends across my entire room, the damn thing is a radio station! Do I have a defective, is this normal? Is there anything I can do to reduce this noise?

james_s:
It's not uncommon with cheap generic Chinese gadgets, but I'm surprised a branded unit like that is spewing so much RFI.

Rerouter:
Best bet, Contact the manufacturer, if its not normal, you may be able to get it replaced.

If no luck there, well 200MHz scope, 108MHz signal, And I suspect either Power supply, or PLL

testtube44:
What should I do now? If I can't get it replaced or its normal is there anyway to stop it radiating?

OwO:
It's normal. A single microstrip transmission line of a few cm will leak enough RFI to be picked up by FM receivers in half of the house. A FCC part 15 radio transmitter will go farther than this.

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