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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 1-6
006-10536-0010 Rev. 10 Oct/2005
C. KRA 405B RECEIVER/TRANSMITTER (cont.)
Load Capability: 4 loads, @ 2 kΩ per load
Off Scale Voltage:
Precision Equipment Output: -28.0 ± 1.5 Vdc
Auxiliary Out #1: +17.3 ± 0.5 Vdc
Auxiliary Out #2: -11.2 ± 0.6 Vdc (-0101)
Auxiliary Out #2: 27.5 ± 1.5 Vdc (-0202)
Time Constant:
Precision Equipment Output: 0.1 second maximum
TRANSMITTER OUTPUT:
Power: 160 mW nominal, FMCW
Center Frequency: 4300 ± 15 MHz
Modulation Frequency:
Primary: 100 Hz nominal
Secondary: 105 Hz nominal (in dual installation)
TRANSMITTER OUTPUT: (cont.)
FM Deviation P-P: 100 MHz
Type of Service: Continuous
WARNING SYSTEM:
FCS Warn:
Normal Operation: +18 to +32 Vdc at less than 250 mA
Warn Condition: Less than 10 μA
Altimeter Valid:
Normal Operation: +18 to +32 Vdc at less than 250 mA
Warn Condition: Less than 10 μA
Rad_Alt Valid:
Normal Operation: +18 to +32 Vdc at less than 250 mA
Warn Condition: Less than 10 μA
ALTITUDE TRIPS:
Tripped (Locked R/T): +0.5 Vdc maximum at less than 250 mA
Untripped (Unlocked R/T): 10 μA maximum at less than +30 Vdc
TONE GENERATOR CIRCUIT:
DH Tone Enable Active Level: Low: < 3.5 Vdc
Inactive Level: High: > 17 Vdc
Tone Active Time: 2.5 seconds ± .5 seconds
Output Frequency: 587 HZ ± 20 Hz (music tone D)
Output Level (-0202): 30mW ± 10 mW into a 500 Ω load
Noise Level: 60 dB min below rated level
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