The 2.7Khz filter in your 544 is truly an interesting bit of information..
Must have been modified by someone..
I found out how the filter in my 540 was used when it went bad and TT sent me a
I see Inrad does make a 2.8Khz unit for the Triton IV along with many other
choices.. I have Inrad 2.8's in both IF's of my Omni VI, they're great IMHO..
I'm really not sure how cost effective a $115 optional crystal filter would be
in a $200 radio..
The active op-amp audio filters did a good job for CW as I remember.. But,
everyone to thier own thing..
Harry N. Coates
Comstock Park, MI
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