[Elecraft] K2 TX audio response mod?

[Bill Coleman]

On May 7, 2010, at 8:52 PM, Casey wrote:

> Hi All,
> 
> I didn't see in the K2 spec what the TX audio response is, but I assume 
> it tops out at 3KHz.
> Has anyone seen a K2 mod to widen this range, to, say, 4KHz or higher?

Audio response is set primarily by the OP1 crystal filter. You could probably substitute a different set of capacitors / crystals and taylor the response. However, widening the filter will tend to worsen the near signal IMD rejection. I can't imagine why anyone would want to do this, particularly if they are using the "2.6" filter already.

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901