[Elecraft] K3: just how wide is it?

[Larry Phipps]

Hi Jack. I've been up for awhile ;-)

For those who are interested, the data was taken from the Rx antenna 
input to the IF output. The scales are either 5dB or 10dB/ vertical 
division, as indicated in the legend at the top of each chart. The 
markers are at roughly the -3dB points. The behavior of the 40m filter 
is caused by the 8.215MHz notch filter.

73,
Larry N8LP



Jack Smith wrote:
> It's probably too early in the morning for Larry, N8LP, to be up, so 
> I'll mention that he has measured K3 RF filter bandwidth data posted 
> at http://www.telepostinc.com/K3_Stuff.html.
>
> Jack K8ZOA
>
>
>
> dj7mgq at muenchen-mail.de wrote:
>> Hi Doug,
>>
>>> OK...just how wide is the bandwidth when "limited by the K3's BP 
>>> filters?
>>
>> For what it's worth...
>>
>> A quick and very dirty attempt to "simulate" one of the filters using 
>> Elsie 2.12 (free version) gave me in the 10m band filter a -3dB width 
>> of roughly 2.7MHz, after some tuning -> 40pF trimmers to 32pF. I 
>> assumed a Q of 1000 for the capacitors and 200 for the inductors.
>>
>> Maybe using Elsie or the AADE filter designer might help give you a 
>> rough idea, if you can't do simulations with Spice.
>>
>> vy 73 de toby
>>
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>