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Palomar line filter

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by WM5TS, Jun 14, 2018.

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  1. WM5TS

    WM5TS XML Subscriber QRZ Page

    Has anyone used the Palomar common mode noise filter? I keep hearing a buzzing sound around 80, 60, and 40 meters. I know band conditions are not good now, just trying to see what I can do to negate some of this noise.

    73
     
  2. NH7RO

    NH7RO Ham Member QRZ Page

    Since Palomar sells torroid kits to slip over coax I suspect that's what the common mode filter is. Common mode chokes can and do reduce noise due to CMC flowing on the outside of the braid. To be the most effective I'd take a look at G3TXQ's choke chart and get some torroids recommended for those bands (probably Mix 31 is best there)---likely a much higher choking impedance with a number of turns of coax through a couple of them).

    73,

    Jeff
     
    WM5TS likes this.

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