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13 kHz FM-bandwidth Roofing Filter, Factory Installed*

*Required for FM.  AM and FM bandwidth filters are required on the main K3S TX/RX board for TX in AM and FM modes. (Only one AM filter is required for AM TX/RX, or one FM filter for FM and AM TX/RX.) All filters can be used for RX in any mode.

There are 5 filter positions per K3S and per KRX3A. The 2.7 (or 2.8) kHz SSB filter uses one of these positions