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by RF_Enthusiast
1167 days ago
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Broadcast transmitters need certification or other forms of verification as a way to certify that they do not put out spurious emissions. Many uncertified transmitters put out emissions at 10.6 and 21.2 MHz above the operating frequency. 90.5 MHz plus 21.2 equals 111.7 MHz, which is in middle of a band of frequencies used for aircraft navigational aids. You can easily imagine how that can be a danger. Pirate stations generally don't fork out the extra cash to get a certified or verified transmitter. And uncertified/unverified transmitter manufacturers generally don't test for compliance regarding interference to public safety bands. |
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