Does anyone know the difference between the IC-53 and the IC-53A cw filters? I know the 53A works with the 765, does the 53? Thanks, Matt--K7BG --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.394 / Virus Database: 224 - Release Date: 10/03/2002