Rich, It should not be necessary to run CAL PLL because of filter adjustments. OTOH, it is a good idea to check (and readjust if necessary) the filters if you have run CAL PLL because you had changed the reference oscillator frequency (C22). 73, Don W3FPR ----- Original Message ----- > Can someone tell me if it is a good idea to run CAL PLL after adjusting any > of the filters? > Rich > --