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It's 18:40 z and I'm 'listening' (I think) to WWRB. There is some religious
fervert doing his thing. At first I thought it was a pirate as the frequency seemed to be drifting up and down. This guy is shouting so loud into the mic, that I came across his splatter as high as 20 khz and more above his broadcast frequency. In my recent SWL experience, I found that most AM signals could be detected at less than +/- 10 khz (usually 5) from the broadcast frequency. He's on 12.172 (I think). My meter seems to be resting on +30. His lower sideband is unclear, being interrupted by other powerhouse stations. In the ILG database, WWRB's modulation is listed as DAB. What is this, and are SW broadcasters limited to 100% modulation as are (were?) amateur and commercial broadcasters? What is a reasonable bandwidth for an AM station. HankG |
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