TM 11-5840-360-14-1-1
Table 1-14. Receiver Transmitter RT-1240 Performance Characteristics
Parameter
Description
9420 7 MHz
Peak Pulse Power Output
20 kW minimum
Pulse Width
0.06 usec (0.25 to 3 NM); 0.5 usec (6,12 NM);
1 usec (24, 48, 64 NM); 0.5 usec (12 RT)
PRF
3600, 1800, and 900 PPS
Receiver
Intermediate Frequency
45 MHz
IF Amplifier Bandwidth
24 MHz (0.06 usec PW); 4 MHz (0.5 and 1 usec PW)
Video Amplifier Bandwidth
20 MHz equivalent (sampled data system)
Noise Figure
10 dB maximum
Minimum Discernible Signal
-98 dBm
System Environment
Ambient Temperature Range
0to +55C
Relative Humidity (at 550 C)
95%
Shock (all planes)
15G
Vibration
1G at 5-50 Hz
Waterproofing
Drip-proof
The slotted waveguide array is continuously rotated
1.13
INDICATORS IP-1282 (12-INCH) AND IP-1283
by the drive system which reduces the antenna motor
(16-INCH)
shaft speed to the desired antenna rotation speed. The
resolver is an electro-mechanical device which converts
1.13.1 Function of Equipment
the rotation and instantaneous direction of the antenna
These indicators provide PPI display for a full 3600
into electrical signals that cause the PPI trace to rotate
coverage. There are ten display ranges extending from
in synchronism with the antenna. The heading line is
0.25 to 64 miles. An added feature includes an
generated by means of a reed switch that momentarily
Electronic
Bearing
Line
(EBL)
for
accurate
closes once every revolution.
measurement of target bearing and range information.
Heading flash and both fixed and variable range
1.12.2 Performance Characteristics
markers are displayed on the CRT along with targets.
Performance characteristics of the antenna and
1.13.2 Performance Characteristics
pedestal are specified in Table 1-15.
Performance characteristics of the indicators are
1.12.3 Physical Description
specified in Table 1-16.
A physical description of the antenna and pedestal
1.13.3 Physical Description
is found in Table 1-25.
Physical descriptions of the IP-1282 and IP-1283
1.12.4 Power Requirements
are given in Table 1-25.
The power requirements for the antenna are 115
Vac, 10, 60 Hz, 350W.
1.13.4 Power Requirements
The power requirements for the indicators are 115
Vac, 10, 50-60 Hz, 160 W.
1-22
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