[Elecraft] K2 Pre Filter

[Stewart Baker]

Hi Benny,

On the face of it your suggestion makes sense, for a little signal attenuation 
get back the lost IMD performance. Is it as simple as that ?

I have copied this to the reflector, so that others more knowledgeable about IMD 
than I might comment.

73
Stewart G3RXQ

On Thu, 24 Mar 2005 23:11:20 +0200, Benny Aumala wrote:
>
>
> Stewart,
>
> something KISS came across when playing with the prefilter idea and
> simulator.
> Voltage response, input impedance and return loss were in my interest for
> close and
> large-band frequencies.
>
> Put a 1,2 - 1,6k resistor across the filter input (between step-up and first
> fiter).
> Or place 200 ohm across input of step-up.
> This gives good large band termination for post-mixer amp and drops the
> signal 1 - 2dB instead of 5dB with resistive
> attenuator. Then only part of pre-filter loss comes into play, and you can
> enjoy the good IMD.
> What say?
>
> Benny  -  oh9nb