[Elecraft] K2 filter performance - Spectogram

[Robert G. Strickland]

Hello, all...

Much thanks for previous assistance.

Running spectogram on #5759 yields the following "indications:"

- stop band for CW filters around 30-40 dB
- using a 440 side tone, all CW filter bandwidths show a series of higher 
frequency "humps" [less attenuation] with the following characteristics:

         main pass band: 440 cps
         1st "hump:"        1345 cps, -12 dB [reference main pass band]
         2nd "hump:"        2250 cps, -25 dB
         3rd "hump:"         3150 cps, -30 dB

The "humps" are less noticeable with wider main pass bands and more 
noticeable as the pass band is narrowed. They look like a series of 
diminishing wave peaks at regular intervals. I could have gone a few more 
that the three noted above, but they get washed out eventually. Any Comments?

Thanks.

...robert


Robert G. Strickland PhD ABPH - KE2WY
rcrgs at verizon.net.usa
Syracuse, New York  USA