DJ0IP wrote: >TEN-TEC 9 MHz FILTERS MODEL: 217 218 219 220 ------------------ --- ----- ----- ------ C/F 9.000xxx MHz: 750 150 750 150 Bad info Rick...The 218 (1800 Hz) and 220 (2400 Hz) are centered at 9.001500, so the "150" above should read "1500". http://www.qsl.net/tentec/manuals/217.pdf 73, Bill W4ZV