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This roofing filter mod kit can help reduce the third order intermodulation from multiple strong signals in the 2 to 20 kHz region either side of the tuned frequency. Installation is simple and requires soldering B+ and ground wires. One coax is moved and a coax jumper is added.
Please see our document titled "A Few Words About Roofing Filters" for more details.
Full installation instructions are available here:
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