Icom FL431

FL431

3kHz 1st IF roofing  filter

The IC-9100/IC7410 comes with a built-in 15kHz 1st IF filter and can accept up to two optional filters (3kHz FL-431 and 6kHz FL-430).

By changing the first IF filter width according to the operating mode, the desired signal is protected from adjacent inband signals at the later stages.

This 3kHz first IF filter is especially effective in the CW and SSB modes.