The Elecraft K3 has five filter slots in the main receiver. The optional 2nd receiver has five filter slots as well. Inrad filters for the K3 are mounted on custom PC boards, and install in the same manner as the Elecraft 8-pole filters. K3 Sort by: Product Price Default #701 400 Hz 8215 kHz CW 8-pole... See details #708 250 Hz 8215 kHz CW 8-pole... See details #709 2100 Hz 8215 kHz SSB 8-pole... See details #710 6000 Hz 8215 kHz AM 8-pole... See details #711 1800 Hz 8215 kHz SSB 8-pole... See details #716 2800 Hz 8215 kHz SSB 8-pole... See details #718 1000 Hz 8215 kHz CW 8-pole... See details #725 13000 Hz 8215 kHz FM 8-pole... See details #727 1500 Hz 8215 kHz SSB 8-pole... See details #728 500 Hz 8215 kHz CW 8-pole... See details #734 2400 Hz 8215 kHz SSB 8-pole... See details
Inrad filters for the K3 are mounted on custom PC boards, and install in the same manner as the Elecraft 8-pole filters.