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Ferrite choke to block out FM?

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fmulder13

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Sep 1, 2006
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218
Location
Minneapolis, MN
So I'm realizing the Pro-2096 is probably one of the most noise-prone scanners there is. I'm getting a strong local FM station come over a couple different frequencies as interference, neither of which are harmonics of this station's frequency. Would a radio shack ferrite choke snapped on to the antenna coax do the trick?
 

prcguy

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Jun 30, 2006
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So Cal - Richardson, TX - Tewksbury, MA
Nope. A snap on ferrite will strip off RF on the outside of the coax (common mode) and a single ferrite doesn't do much unless you pass the cable through the core several times for VHF. For HF it might take 10 turns through the core to have much choking benefit. It sounds like you could benefit from an FM notch or band stop filter. This will keep the FM band out of your scanner and probably clean up a lot of intermod interference created in the scanner from strong FM broadcasters overloading the front end or other stages.
prcguy
So I'm realizing the Pro-2096 is probably one of the most noise-prone scanners there is. I'm getting a strong local FM station come over a couple different frequencies as interference, neither of which are harmonics of this station's frequency. Would a radio shack ferrite choke snapped on to the antenna coax do the trick?
 
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