[Elecraft] Thoughts of K2 xtal prefilter

[Benny Aumala]

Installing prefilter IN STEAD of KNB2 gives the possibility to
place 5dB 140 ohm attenuator on the same board in front of the prefilter.
Then the 5dB pad should be temporarily taken out of function on main rf-board.

Installing prefilter on top of KNB2 :
-Input of KNB2 seems to have the necessary attenuation. 
-Output can be taken from top of C6 and L2 and noise gate also
 connected here through C8. This saves the step-up coil in xtal filter.
-Original 5dB pad off in main rf-board
-For removal, this KNB2 + prefilter unit must be replaced with a
 simple board with that 5dB pad.

Benny      OH9NB