Ten Tec Model 288 1.8 Khz 8 pole 6.3 Mhz IF filter This filter is used in the Omni series, the Paragon, and the Corsair. It can be used as a wide CW filter or a narrow SSB filter for noisy or crowded bands. It is working perfectly. $70.00 delivered to your door. Thanks & 73, Bill - K6WLM