[Elecraft] [K3] Filters for mixed JT65 and JT9 HF

[Bob]

Just be aware that current DSP firmware in the K3 limits the receive
bandwidth to something around 3400 Hz.  So even if you have a wider filter,
like the 6 KHz AM filter, you will not be able to utilize the full 4 KHz
bandwidth of WSJT-X for JT65/MT9 modes.

Lyle is aware of this issue and it is on his list to work on in the future.

And even if you are in Split mode, rest assured that you know exactly where
you are transmitting -- on the exact audio offset indicated on the display.
 Operating Split is the way to go.  The only drawback I've seen is that
WSJT-X does nothing to make sure the K3 is in the Split mode, it just
assumes it is.

73, Bob, WB4SON