User's Manual

SYSTEM OPERATION

TUNING FORK TEST

The DRU III unit can be configured to output speeds of

targets that are approaching only, receding only, both

approaching and receding, or all targets including non-

directional targets. Tuning forks can only be reliably

read in the all targets mode. (Tuning fork signals are

generally non-directional targets).

NOTE: Some display systems only display non-

directional target for a short time after power up.

A 35 MPH (or 45 KPH) tuning fork is supplied with the

radar. Strike the tuning fork on a hard, non-metallic

surface. Hold the vibrating tuning fork approximately one

inch in front of the antenna. The output speed should

(KPH) are considered acceptable.

If the proper reading is not obtained:

1. Make sure that Kustom Signals K-Band tuning forks

have been used ("K-Band" is stamped plainly on each

fork). A different band tuning fork, or tuning forks

designed for other manufacturers' radar, will not give

the proper readings.

2. Striking the tuning forks too hard may produce false

overtones, which may be read as speeds above or below

those specified. These possible false readings are

momentary, and the proper readings should appear as

the false overtones dissipate. Do not move the tuning

forks after placing them in front of the antenna.