Re: 2.8kHz roofing filter

Posted by Bill W4ZV on Oct 23, 2010; 8:51pm
URL: http://elecraft.85.s1.nabble.com/2-8kHz-roofing-filter-tp5665995p5666368.html

ab2tc wrote

In USB there is a definite upward tilt of the passband and the opposite for LSB. This is quite audible. Is this normal and is there anything I can do about it (other than asking Elecraft to add by mode equalizer)?

Probably nothing you can do other than tweaking EQ per mode.  It's caused by the filter having an actual amplitude tilt in its passband.  In USB the upward tilt is on the upper side and in LSB it's on the lower side.  I don't think you would notice the small 8-pole offset (typically 50 Hz) in a 2.8k filter, but they are more noticeable in CW filters.

73,  Bill