Section 6--Testing Procedures
6.4
6.5.
Tuning Fork Testing
Supplied with the Eagle II are two tuning forks, 35 MPH
and 65 MPH (45 km/h and 80 km/h) for K and some Ka-
Band, 30 and 55 MPH for other Ka-Band. These tuning
forks will simulate moving vehicles in the stationary or
moving modes.
The tuning fork tests should be conducted in an area with no
traffic. If this is not possible, point the antenna upward to
avoid reflections from moving vehicles.
Tuning fork test tolerance: + 1 MPH (1 km/h).
** Due to the ability of the Eagle II to reject interfering
signals, if the antenna label reads “DCM” the operator
must place the unit in the
TEST mode
to read tuning
forks. Momentarily depress the TEST switch. Upon
releasing this switch, the Eagle II will complete the
internal tests and enter the tuning fork TEST mode. The
Eagle II will remain in TEST mode for 30-seconds as
indicated by the flashing TEST indicator LED.
NOTE: Since striking a tuning fork too hard may cause
harmonic oscillations that will be picked up by the
fan interference filter, blanking all speed-readings,
it is recommended that the operator momentarily
turn the filter "OFF" during this test. (These tests
can be performed without turning the filter off if
the tuning forks are lightly struck.) If the fan
filter is normally used, remember to reset the filter
to the FAN "ON" mode after the tuning fork tests
have been completed.
