SAM Electronics GmbH NG3028X25KW Manual Do Utilizador

ED 3038 G 232 / 01 (2002-06) 

b_r1_e72.fm / 21.06.02

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Checking the transmitter performance

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Checking the receiver sensitivity

With the Performance Monitor, the transmitter performance and the receiver sensitivity can be checked.

To check the transmitter performance, the antenna gearbox contains an auxiliary antenna in the radi-
ating region of the main antenna. The signal received by this auxiliary antenna is processed and
produces a "good/bad" display. This check thus covers the entire RF transmitting branch of the trans-
ceiver, including the magnetron (which is subject to natural aging), the waveguide and the antenna.

The receiver sensitivity is checked by inputting a signal directly at the receiver input, which leads to a
"good" display if, and only if, the amplification is adequate.

1.

Perform tuning as described in 

2.

Click on the buttons MENU,  UTILITIES and PERFORMANCE
MONITOR one after the other. After the safety-related question
which then appears has been answered suitably, the radar is
automatically switched to the following settings:
-

RANGE  =  24  NM

-

RAIN  =  0

-

SEA = 0

-

CLEAN SWEEP = OFF

-

IR  =  OFF

If the high revolution rate of the antenna is switched on, a switch-over to the normal revolution rate
takes place automatically.

Beside the GAIN area, the coloured symbol

 appears. indicating that the Performance Monitor

is switched on.

3.

Perform tuning and set the gain so that the noise is only just visible and no more.

4.

On the PPI, a sector is displayed as the result for the check of the transmitting performance, and a
circle is displayed as the result for the check of the receiving performance.