I would like to trade for or purchase a 250 Hz filter for the 9.0 MHz IF (Tentec 219, 2019, or INRAD equivalent). I have an extra 500 Hz filter (9.0 IF) (217) which I can trade for it. I have decided to populate the N1 and N2 positions with 500 and 250s and move the 1000Hz INRAD to the OmniV. -- 73 Allan K7GT