First, does it only on a few select bands, or on all bands? If one or two
bands only chances are it is a hetrodyne crystal that has aged and is going
out of lock. Some of those crystals are used one more than one band. One
clue is that the rig will work well when cold, and then act up when the
pizza oven that encloses those PLL boards gets hot. TenTec provided no
airflow, and there are two pass regulator transistors on the aluminum lid
that adds to the heating problem. There is a procedure for setting the
lock range for each crystal that requires using a good scope to monitor a
point on the uP control board. I've fought that problem on three or four
Omni VI rigs I own. Pete
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