Check the voltage regulators in the control box. I had a similar problem
and one of the regulators was open and the voltage was varying causing very
>>> I have an older model HDR 300. The digital display is all over the
place. It zeros out okay, but once the antenna begins rotating the digits
are jumping plus or minus10 to 15 degrees. Tried replacing the filter
capacitor C5, no luck. Tried adjusting gain and zero, no luck.
Short of junking the conroller, does anyone have any ideas?
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