Fred,
If 40 meters works, then 30 should also. They share the same low pass
filter and the inductors of the bandpass filter and Pre-Mixer bandpass
filter.
One possibility is that the crystal for 30 meters has gone bad. You can
check for that with an oscilloscope or RF Probe at P1 pin 4.
I just acquired a K1 4 bander from a ham in Ottawa. It has 40,30,20 and 15
meters in it. All bands operate and function as they should except for 30
meters. Have done some searches on this possible issue but nothing solid as of
yet. Anyone have a starting point where I might look to see or find
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