User's Manual

Performance Checks - Monthly or Be fore Leav ing Port
8 The performance of the magnetron, transmission line and receiver circuits is checked by
carrying out a performance monitor check.
9 The performance monitors consist of:
(1) Transmission Monitor - comprises a monitor arm fitted to the outer case of the
scanner unit. The monitor arm neon is ionised as the antenna passes over the arm,
and a ‘plume’ is shown on the screen.
(2) Receiver Monitor - uses a resonant cavity (X-band) or signal source (S-band) to
generate a reference signal. The signal is shown as 'fingers' on the screen for an
S-band transceiver and as a 'sun' on the screen for an X-band transceiver.
10 To carry out the performance monitor check, proceed as follows:
(1) Switch the visual display unit power to ON.
(2) After the Tx warm-up period, go to transmit in either single or dual radar mode.
(3) Select the 12 nautical mile range. Ensure the radar image is correctly tuned.
(4) Left-click on the on-screen PM button.
(5) Using the VRM facility, measure the length of the 'plume'. Record the length of
the 'plume' in the users record under the PERFORMANCE MONITOR heading
in the TX.... nm. This data must be recorded as it will be used to identify
degradation in performance.
(6) Select 1.5 nautical mile range (X-band) or leave on 12 nautical mile range
(S-band) and PERF.MON, (this on-screen button is located at the top left-hand
corner of the radar operational area).
(7) By using the VRM facility, measure the length of the radar 'fingers' or diameter of
the 'sun' on the screen.
(8) Record the length of the 'fingers' or diameter of the 'sun' in the users record under
the PERFORMANCE MONITOR heading in the RX.... nm. This data must be
recorded as it will be used to identify degradation in performance.
(9) Compare the results with those previously recorded. If there is a significant
degradation since the last reading, refer to the Performance Check Degradation
paragraphs below.
Page 4.4 Issue 5 (Jan 09)
KH2060-4