[Elecraft] K3 Low Pass Question

[Geoffrey Mackenzie-Kennedy]

Hi David,

If of any interest to you I can send you "off List" some results of my most 
recent two tone "IMD" tests on bandpass filters for use in a receiver's 
front end, which would give you some idea of the effect of a core and its 
size. These show each filter's 3rd order Output Intercept vs. core size vs. 
some core mixes. Bands covered are 160m to 6m inclusive.

Please let me know "off List" if you are interested.

73,

Geoff
GM4ESD


From: "David Cutter wrote on Friday, June 18, 2010 2:47 PM:



> Hi Geoff
>
> I didn't know that about small cores, but, if I were to take on this idea, 
> I
> would use the biggest I could get in there, which is around 45mm.
>
> There's a local radio station on medium wave which has given me grief in 
> the
> past, (pre K3 mind you) and I could change it into a high pass filter just
> for that.
>
> Come to think of it, I wonder if I could make such a filter for use with 
> the
> MFJ259; that might be a better idea.
>
> David
> G3UNA