JRC JMA-3400 Series, Instruction Manual, Page: 208 / 314

Chapter 8 DETAIL PERFORMANCE SETTINGS
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8.4.1 SLOPE CORRECTION
The dynamic range of scanner receiver is different.
Therefore, adjust the characteristics with this function.
8.4.2 PULSE REPETITION FREQUENCY FINE TUNING (PRF FINE
TUNING)
If radar’s interference patterns are concentrically displayed, increment or decrement the set value by 3 to 4
in order to heighten the effect of interference rejection.
PRF Fine Tuning:
Fine-tune the transmitting repetition frequency of the transmitter in the range 90% to 100%.
This setting cannot be performed simultaneously with the setting of “STAGGER TRIGGER.”
8.4.3 STAGGER TRIGGER
Turn on/off the interference reduction function controlled by the transmission repetition frequency control of
the transmitter.
This function is effective when radar interference does not go away.
This setting cannot be performed simultaneously with the setting of “PRF FINE TUNING.”
8.4.4 SCANNER ROTATION SPEED
Set the scanner rotation speed for each pulse width. The radar sensitivity is higher when antenna is rotating
in low speed.
Short range operation requires a high speed antenna rotation to refresh the screen as soon as possible.
Long range operation requires a low speed antenna rotation to maintain a high sensitivity.
You can select a rotational speed according to your request.
Note:
The following setting values of the rotation speed are the setting values for the motor, and the actual
rotation speed of the antenna will cause a slight error toward the setting value.
In addition, this value is a guide when there is no wind, and errors may occur depending on the wind
direction and wind speed.
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JMA-3406, JMA-3411-4, JMA-3411-6
0=27.0rpm, 1=25.4rpm, 2=23.8rpm, 3=22.2rpm, 4=20.6rpm, 5=19.0rpm, 6=17.4rpm, 7=16.0rpm
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JMA-3404, JMA-3406HS, JMA-3411-4HS, JMA-3411-6HS
0=48rpm, 1=42rpm, 2=36rpm, 3=30rpm, 4=27rpm, 5=24rpm, 6=20rpm, 7=16rpm
8.4.5 PRF OUTPUT MODE
Select the operation mode of the transmitting repetition frequency of the transmitter.
Normal: Default setting is Normal. Both appropriate sensitivity and magnetron life expectancy are
considered.
Economy: Sensitivity lowers, but the service life of magnetron is prolonged when short pulses
are used.
High Power: Sensitivity improves when long pulse is used, but the service life of magnetron is slightly
shortened.
8.4.6 SAFETY SWITCH
Set the status of safety switch.
You can select the status from the following items.
TX-Off/Standby/TX-On/Ignore Error