JRC JMA-7710-6 Instruction Manual page 129

[Page 3] 3. GAIN OFFSET
• Corrects the sensitivity in the state where the function mode is called.
• Delicate adjustments of sensitivity are necessary to achieve the optimum sensitivity since the noise
level that is displayed changes according to the combination of video processing and radar interference
processing.
• The gain offset function enables achievement of constant optimum sensitivity without having to
operate the [GAIN] control at switching of the function mode by storing the [GAIN] control correction
value in each function mode.
• Set the value to "+" to increase the sensitivity.
• Set the value to "-" to reduce the sensitivity.
• For radar interference processing, set the gain offset value to "+" side, since the noise level decreases
as the value increases.
• When "PROC1" or "PROC2" is used, set the gain offset value to the "+" side since the noise level
decreases.
• When "PROC3" is used, set the gain offset value to "-" side since noise remains on the screen exceeding
the image processing threshold value.
• When "TGT EXPANSION" is used, set the gain offset value to the "-" side since noise is emphasized.
[Page 3] 4. TRANSMISSION (XMIT) REPETITION FREQUENCY
• Select one of three transmission repetition frequency types.
• The transmission repetition frequency relates to the sensitivity and power consumption (life span of
magnetron).
• When the transmission repetition frequency is high, the sensitivity improves, however, the power
consumption also increases, reducing the life span of the magnetron.
• When the transmission repetition frequency is low, the power consumption decreases, increasing the
magnetron life span, however, the sensitivity deteriorates.
• The radar trails reduction processing demonstrates the effect when the transmission repetition frequency
is "ECONOMY".
NORMAL : Balanced setting for the sensitivity and the life span of the magnetron.
HIPOWER : Hipower setting; use for detecting small targets.
However, the life span of the magnetron is reduced.
ECONOMY : Economy setting. The maximum life span of the magnetron can be increased.
However, the sensitivity deteriorates slightly.
Use this mode at radar trail fine line processing.
When the fales echoes appear by anomalous propagation, using this mode reduces
those fales echoes.
See section "6.4 [V] Anomalous Propagation".
Page 3
1. VIDEO LATITUDE
2. VIDEO NOISE REJECTION
3. GAIN OFFSET
4. XMIT REPETITION FREQUENCY
5. SMALL BUOY DETECTION
6. AUTO DR CONT
NORMAL WIDE
OFF LEVEL1
± NUMERIC VALUE
NORMAL HIPOWER
OFF ON
OFF ON
3 – 70
NARROW
LEVEL2
ECONOMY
3.4
3