Honeywell KA 54 - Manual (Page 39)

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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 2-13
006-10536-0010 Rev. 10 Oct/2005
• Avoid the use of right angle or bulkhead coax connectors. Volt-
age standing wave ratios (VSWR) are greater on these types of
connectors and therefore can cause problems. If bulkhead con-
nectors must be used, then connectors such as Kings Electronics
Inc. P/N KA 19-102 or equivalent must be used. If right angle
connectors must be used, they must be specified for operation at
4.3 GHz and extreme care should be exercised in their assembly.
In either case, the tests in 2.6 POST INSTALLATION should be per-
formed.
• Bends tighter than the minimum recommended bend radius can sig-
nificantly increase VSWR. (See TABLE 1-2 CABLE INSTALLATIONS for
minimum bend radii.)
• Excess cable lengths should be lashed securely but not to the
point of cutting or distorting the cable insulation. Cutting the
coax shield causes an altitude return and affects system opera-
tion.
• Tighten all antenna coax connectors slightly more than finger
tight.
CAUTION: DO NOT PAINT ANTENNA. OPERATION AND/OR ACCURACY MAY SUF-
FER AND MAY CAUSE UNIT TO LOCK ON TO ERRONEOUS ALTITUDES.
F. ANTENNA CABLES
After the location of the antennas has been determined, a minimum
length of antenna cable required for the installation may be gauged.
Measure the distance from the receiver and the transmitter
connectors (located on the front of the KRA 405B) to each antenna
adding enough extra length to avoid obstructions in the cable path
and to allow for connection to the antenna connector.
System sensitivity suffers when cables lengths do not comply with
the recommended minimum and maximum lengths.
NOTE: Refer to TABLE 1-2 CABLE INSTALLATIONS to establish min-
imum and maximum cable lengths.