[Elecraft] K2: 40m bandpass filter

[Don Wilhelm]

  Sorry,  I saw C228 through my morning eyes and answered about the LPF, 
but the question was about the BPF - it has been answered by Sverre.

73,
Don W3FPR

On 1/15/2011 8:56 AM, Don Wilhelm wrote:
>    David,
>
> The 40 meter LPF was changed to an elliptical filter - you can see by
> comparing the old and new circuits.
> I am not certain of the reason, but I have assumed that it provides
> better performance for both 50 and 40 meters (better harmonic rejection
> for 60 meters).
>
> 73,
> Don W3FPR
>
> On 1/15/2011 3:21 AM, David Pratt wrote:
>> Don W3FPR:
>> A query about C228 a few days ago prompted me to look at my own K2
>> manual which does not show C228. Unless my old grey cells deceive me, I
>> recall the 40m bandpass filter being changed several years ago. In fact,
>> I have found an old envelope in which I have gathered together the
>> necessary five capacitors to make the change.
>>
>> My question is: What was the reason for the change of the 40m bandpass
>> filter and is it worth doing?  BTW, I do use my K2 on 60m.
>>
>> 73 de David G4DMP
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