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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 2-20
006-10536-0010 Rev. 10 Oct/2005
An antenna fault will be detected when its cable is ter-
minated into a 50 ohm load and the indicator needle will
stow behind the mask. Re-bond the antenna if the point-
er is now stowed.
If the indicator pointer still does not stow, this in-
dicates an RF cable or connector problem. Remove both
cables at the antenna and terminate one of them with a
50 ohm RF load. Remove the other cable at the R/T end
and terminate with a 50 ohm RF load. The indicator nee-
dle should stow behind the mask.
h. Repeat this test for the other cable. A fault here can
be addressed by following the suggestions in 2.5 KRA
405B SYSTEM INSTALLATION pertaining to the cables.
D. TEST PROCEDURE
KRA 405B Radar Altimeter Post Installation Test Procedures using
1000 Foot Delay Line.
(1) Purpose of Test.
This test simulates an actual altitude of 1000 feet AGL with
various return signal strengths. Low power output, poor coax
cables, poor connectors and poor R/T performance can be found
using this method.
(2) Required Equipment
The items listed below or their electrical equivalent, may be
used to conduct the tests in this section.
QUANTITY DESCRIPTION MANUFACTURER MANU. PART NUMBER
1 1000 ft Delayline Teledyne M7421B
1 Attenuator Variable
4-8 GHz 0-40 dB
Narda 794-FM
2 Attenuator Fixed
3-6 GHz 20 dB
Narda 773-20
2 Adapter N
F
to SMA
P/N 030-00123-0000
Americon 2082-2300
2 Adapter N
M
to TNC
F
Amphenol 78800
1 Adapter N
M
to TNC
M
Amphenol 78875
1 6 ft RG 393/U with TNC
M
con-
nector