RE CEIVER MONI TOR
22
The X-Band receiver monitor comprises a resonant
cavity fitted to the waveguide transition joint at the
entry to the transmitter. The resonant cavity contains an
adjustable plunger that is factory set, according to
magnetron frequency. When the monitor is activated, by
pressing PM (Performance Monitor) on the display, a ‘sun’
shows in the centre of the radar screen area.
TRANS MIS SION MONI TOR
23
The Transmission Monitor comprises a monitor arm
fitted to the outer case of the turning mechanism.
Selecting PM (Performance Monitor) on the display
activates the transmission monitor. The monitor arm neon is
ionised as the antenna passes over the arm and the radiated
signal impinges on the integral neon lamp. This causes a
‘plume’ to be displayed on the radar screen.
SPECI FI CA TION
24
Technical specifications for the MkIV Transceiver are
provided in Table 1, below.
Table 1 - MkIV Transceiver Specification
Frequency:
X-Band 9410
±
30MHz
Peak Power output:
X-Band 25kW nominal
Magnetron Life:
10,000 Hours typical
Pulse Length and P.R.F:
Short: (S):
X-Band 0.07
m
s (0.045-0.085)
1500 ±40, or 3000 pps
±
80
Medium (M)
0.25
m
s (0.20-0.30)
750pps
±
20 or 1500
±
40
Long (L)
1.0
m
s (0.85-1.0)
750pps
±
20
Long-Low PRF (VL)
1.0
m
s (0.85-1.0)
375pps ±10
Sync. Output:
3 x 75 Ohm outputs
(Downmast)
1 x 75 Ohm output (Upmast
not less than +12V amplitude
Receiver (used for all transceivers):
Type:
Logarithmic Receiver
Transfer Characteristics:
Nominal
I.F.
60MHz
Video Outputs
3 x 75 Ohm outputs
(Downmast)
2 x 75 Ohm outputs (Upmast)
5.5 peak amplitude.
NOTES:
(1) The PRF oscillator can be preset with a basic frequency
range of 2400 - 3400 Hz (nominal 3000 Hz).
(2) Short pulse can be set to 3000 or 1500 Hz base.
(3) Medium pulse can be set to 1500 or 750 Hz base.
(4) Pulse to pulse jitter can be selected and set to
±
15
m
s
from nominal.
DI AG NOS TICS
25
The Algorithms detailed in Figures 7a to 10a provide
an aid to fault diagnosis in the transceiver. Entry to the
algorithms is via Failure Messages generated at the display.
PRE REQ UI SITES
26
Before any fault diagnosis and rectification is
implemented, the radar system must be in a standard
configuration, as detailed at the top of the appropriate fault
diagnosis algorithm.
FAIL URE MES SAGES
27
The failure messages detailed in Table 2 below,
appear in the data field of the display monitor if certain
signals are missing.
Table 2 - Failure Messages
SIGNAL
FAILURE
MESSAGE
Sync.
No Sync.
Video
No Video
28
Refer to Figures 7 to 10 for fault diagnosis algorithms
associated with these failures.
TEST EQUIP MENT
29
Routine field maintenance requires fault location down
to fuse replacement level, or to change suspect
PCBs/Units for known working ones. The only test
equipment required for fault finding is a high impedance
Multimeter and a 100MHz oscilloscope.
Original
7a.5
May 01
KH 2020
Chap 7a
Summary of Contents for Kelvin Hughes Nucleus 3 5000 Series
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