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Oops, got carried away and added an extra "0" there. The correct amount is 2,000 times.
30 dB=1x10^3=1,000x
3 dB= 2x
1,000 * 2 = 2,000
FM broadcasts have a nasty habit of interfering with TV reception, almost always on VHF channels where, in the case of a single interfering FM station, the FM frequency, when doubled, falls into the occupied bandwidth of a TV channel. There are more complex interactions regarding two or more FM stations and also computing the sum and difference frequencies. A lot of it has to do with the failure of TV set designers to make their tuner's more selective so that the interfering frequencies are rejected before they get into the first mixer stage of the tuner. FMI can be reduced or eliminated with the use of a simple inexpensive FM filter.
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