[Elecraft] K2 filter attenuation

[k6se@juno.com]

Colin, N0YGY wrote:

"I've noticed that when trying to grab a weak signal I have to keep the
filter wide. If I try to narrow the filter selection to block out an
adjacent signal there seems to be some (significant) attenuation to the
filter. That's not a problem for strong signals but for the very weak
signals I will totally lose the station. So if I want to work a weak
signal I have to put up with other stations  well off the centered
frequency. Is this normal? I've checked the alignment (according to Don,
KD5NDB) and the 40M birdie remains fairly consistent in pitch as I switch
through the filters. Any suggestions?"
==========
Sounds like the classic BFO temperature drift to me, which causes the
desired sigbal to drift out of the passband of narrow CW filter settings.
 Try running Spectrogram when the problem occurs.

73, de Earl, K6SE