Doppler Weather Radar - METNET - India Meteorological Department

Figure 4.1. Bitex main panel when fault came
At the time when servicing started, the reason why these were displaying red and yellow
were not known. So, the trouble–shooting was done in a systematic way as follows:
(1) Zauto was opened and checked autocal. The calibration was ok.
(2) Antenna and ascope were opened.
(3) DCU general is displaying red and so, on right-clicking it, RF generator status is displayed
with fault at receiver protect.
(4) Then all the orange cable wiring and cable to receiver protector (J4) was checked. It was
found ok.
(5) Later, connected to rvp8 by ssh command and rebooted the rvp8.
(6) As DAU bytes 0-3 was red, it was opened, and it was showing fault in Klystron preheat.
Hence, it was concluded that preheat was not available due to receiver protect signal not
available. So, it was concluded that the cables connecting to receiver protector should be
checked physically.
(7) Hence, all cables connected to receiver protector were checked with CRO and also
physically. It was finally found that one cable no.4 connecting to receiver protector was
found cut and it was soldered. Radar was turned on and then preheat became available.
(8) Then HV was switched on and then radar started working ok.
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