Login  Register

How to center K1's crystal filters?

Posted by cottersay on Jan 26, 2016; 12:17am
URL: http://elecraft.85.s1.nabble.com/How-to-center-K1-s-crystal-filters-tp7613108.html

I built my K1 years ago, but I also just re-read the K1 manual, yet I still do not quite understand how to adjust the Xtal filter's bandwidth to center on my chosen sidetone frequency of 500Hz.  (The way I check the K1's xtal filter's center frequency is to display the K1's audio output noise into a PC's spectrum analyzer, as shown below).

K1 audio output (FL1)

How do I adjust FL1, FL2, and FL3's center frequency without messing up any other parameter?

Thank you!