Recently purchased a 500Hz CW filter for my FT-77. Purchased the rig used, so I have no manual. It's been a great performer here in the shack as a backup, but since I stay on the lower end of the bands, I really needed to be able to zero in on signals and get rid of some of the QRM.
I figured the filter installation was as simple as dropping in the 4-pole unit, four quick solder points, and I'd be done...but I tried that without success.
The rig still works as normal with a wide reception, but when I switch to the narrow filter, I get no change.
Am I overlooking something obvious? If anyone's familiar with this rig and has any answers or suggestions, please let me know. Thanks in advance!
73,
Doug, K4EK