The TS-570 has one filter option slot. All Inrad filters for the TS-570 are mounted on a custom PC-board and plug into the radio in a fashion similar to the factory filters.

TS-570

Sort by: Product Price Default #22 250 Hz 8830 kHz CW 8-pole... See details   #103 400 Hz 8830 kHz CW 8-pole... See details #95 1800 Hz 8830 kHz SSB 8-pole... See details #94 2100 Hz 8830 kHz SSB 8-pole... See details #88 2800 Hz 8830 kHz SSB 8-pole... See details