[Elecraft] Re: L25 L26

[Wayne Burdick]

David Schornak wrote:

> L25 L26
> in the old manual it says both get wound on the red cores with 16 turns
> in the manual that came with my k2 rev b it says to wind 13 on one and 14 on the other I was wondering which is correct I am assuming that the manual that came with my rev b board should be right.

Hi David,

The new manual is correct for your Rev B K2 kit. The original 40-meter low-pass filter has
been redesigned to improve roll-off of the second harmonic when operating on 60 meters, in
anticipation of the future K60XV option (60 meters + low-level transverter I/O). The
original 40-meter filter suppresed the 2nd harmonic on 60 meters to an acceptible degree
(about -50 dB), but the new one is about 10-15 dB better.

73,
Wayne