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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 2-18
006-10536-0010 Rev. 10 Oct/2005
It also ensures the absence of an RF leakage path allowing the
4.3 GHz transmitter output to bleed into the system’s receiv-
er, thus bypassing the normal antenna-to-ground-to-antenna
path while flying above 2,500 feet AGL.
The following procedure duplicates a flight altitude greater
than 2,500 feet AGL in order to find these RF leakage paths.
(2) Required Equipment
The items listed below, or their electrical equivalent, may
be used to conduct the tests in this paragraph.
(3) Test Procedures
a. Turn on aircraft primary power.
b. Adjust the DH knob on the indicator to set the DH bug
to 25 feet.
c. Depress the test button on the indicator. The altitude
indicated should be 50 ± 5 feet and the DH lamp should
be out.
d. Slowly advance the DH bug until the DH lamp lights. The
bug should be set at 50 ± 5 feet at this time. Continue
increasing the DH bug setting. The DH lamp should stay
lit.
e. Release the test button. The indicated altitude should
now be 0 ± 5 feet.
NOTE: In some installations, the tolerances given
here may be greater, due to antenna location
and a difference between aircraft touch down
attitude and parked attitude.
QUANTITY DESCRIPTION MANUFACTURER MANU. PART NUMBER
2
(1 ft sq.)
Microwave Absorber Emerson & Cummins
Tel: (800) 650-5740
or: (781) 961-9600
AN 75
2 TNC Female Barrels Americon 3180-0000
2 TNC Male Loads Microlab FXR TA-SMT