Section 6--Testing Procedures
6.7
10. Lightly strike the lower speed tuning fork on a hard,
non-metallic surface. Place it approximately 1 inch in
front of the antenna. Verify that the patrol speed
displayed is the speed stamped on the fork. While
holding the lower speed tuning fork in front of the
antenna, lightly strike the higher speed tuning fork on a
hard, non-metallic surface and place it in front of the
antenna at the same time.
The TARGET speed display should read 30 MPH for K-
Band, 25 (or 30) for Ka-Band (35 km/h). Closing speed,
65 (55), minus patrol speed, 35 (30), equals 30 (25). (80
km/h minus 45 km/h equals 35 km/h).
6.5.1. Tuning Fork Test Failure
If proper speed-readings are not obtained during the
previous tests, check the following:
1. Verify that the tuning forks are the proper tuning forks
supplied with the unit.
2. Striking the tuning forks too hard or on a metallic surface
will cause spurious overtones from the tuning forks.
This may cause the speed-readings to be slightly higher
than specified. These readings are only momentary and
the proper readings should appear as the false overtones
dissipate.
NOTE: Do not move the tuning forks after they have been
placed in front of the antenna.
3. Ensure that the Eagle II is not in the HOLD mode and
that the RANGE control is set to 6 (maximum range).
4. If the antenna label reads “DCM”, the radar system must
be placed in TEST mode for the unit to read tuning
forks. Press the TEST button. The radar system will
remain in TEST mode for 30-seconds and will be
indicated by the flashing TEST LED indicator.
