Kustom Signals Golden Eagle II Operator's Manual page 67

Section 9--Recommended Care & Maintenance
Broken power and antenna cables are a common cause
of intermittent operation.
6. If the radar exhibits decreasing range over a period of
time, the unit should be examined by an authorized
service center for possible receiver diode degradation.
Receiver diode degradation has no effect on the unit's
accuracy, but will result in unsatisfactory target range.
7. Kustom Signals recommends periodic maintenance of
the Golden Eagle II radar system. Check with your
local service center and judicial district for
requirements.
9.2