Hello, Swap my Inrad #704 (455) 250 Hz filter for: Inrad #713 (455) 1000 Hz, Inrad #718 (8.215) 1000 Hz or Inrad #716 (8.215) 2800 Hz. Thanks and 73! Hans PA1HR Sites: www.remeeus.nl www.qsl.net/pa1hr e-mail: [email protected]