[Elecraft] CW roofing filters for the K3

[Bill Tippett]

W2KJ:
 >Am wondering though if the Elecraft lab has made any measurements in
comparing the performance of the 5 pole  500hz CW filter as opposed to the 8
pole 400hz CW filter.

http://marc.info/?l=elecraft&m=118970837128258&w=2

Here you go! These are recent measurements from our lab.

Filter            20kHz  10kHz  5kHz  2kHz
200 Hz, 5 pole    100+   100+   100+   95
250 Hz, 8 pole    100+   100+   100+   95
400 Hz, 8 pole    100+   100+   100+   95
500 Hz, 5 pole    100+   100+   100+   94
1 kHz, 8 pole     100+   100+   100    94
2.7 kHz, 5 pole   100+   98      92    n/a
2.8 kHz, 8 pole   100+   100     93    n/a

These are typical numbers and may vary a couple of dB from radio to
radio or filter to filter.

73, Eric  WA6HHQ