Japan Radio Co. JFE-680, Instruction Manual

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A A dj dj u u s s t t i i ng ng Recei Recei v v er er Sens Sens i i t t i i v v it it y y
Select the step from 0 to Select the step from 0 to 30. 30.
Pressing the (GAIN) + key increases sensitivity. Pressing the (GAIN) + key increases sensitivity.
Pressing the (GAIN) – key decreases sensitivity. Pressing the (GAIN) – key decreases sensitivity.
If the receiver sensitivity is set too high, noise will also be displayed on the screen, making it If the receiver sensitivity is set too high, noise will also be displayed on the screen, making it
difficult to
difficult to distinguish the distinguish the seabed. seabed. The seabed The seabed color should color should be be orange, red orange, red or color or color between between
orange a orange and red. nd red. Adjust the Adjust the sensitivity sensitivity to an a to an appropriate ppropriate value by value by monitoring monitoring the image the image
being plotted on the screen. (See being plotted on the screen. (See figure below) figure below)
Increase Increase
sensitivity
sensitivity
Good Decrease Good Decrease
sensitivity sensitivity
Au Au t t o o ma ma t t i i c c Gain Gain
In the Automatic gain mode, In the Automatic gain mode, the sensitivity is the sensitivity is automatically adjusted. automatically adjusted.
Press and Press and hold both hold both the (GAIN) + the (GAIN) + and – keys and – keys for three sec for three seconds. onds. Once Once Automatic gai Automatic gain mode n mode
is selected, the text is selected, the text “GAIN:AUTO” will appear on the screen and LONG “GAIN:AUTO” will appear on the screen and LONG will be selected at will be selected at
STC function. STC function.
The Automatic range mode is cancelled by pressing the (GAIN) + or – key. The Automatic range mode is cancelled by pressing the (GAIN) + or – key.
Note: Note:
1. The Automatic gain mode can be set by
1. The Automatic gain mode can be set by a dedicated menu function. a dedicated menu function.
2. Default setting of the automatic gain is 10 in the steps 0 2. Default setting of the automatic gain is 10 in the steps 0 to 20. to 20.
4. 4. Operation Operation 12 12