9.21 Manual tuning procedure for the 6000i or 6100i system
Note: The following manual tuning procedure is provided only for possible situations where the unit's automatic tuning does not perform well with a Northstar 6000i or 6100i system. At present, Navico is not aware of any such situation and recommends that automatic tuning be used, unless a reason is found to use this manual procedure.
¾Begin by restoring all radar settings to their factory settings (except trigger delay, heading calibration and whether or not a heading sensor is installed), as follows:
•From the main radar page, press Page 1.
•Press Restore... .
•Press Restore factory settings to return the unit to its state when it was shipped (with the exception of trigger delay, heading calibration and whether or not a heading sensor is installed).
•Press Return and Done to return to the main radar screen.
¾Next, set the rain clutter and sea clutter to 0 and the gain to 150 as follows:
•From the main radar page, press Page 2.
•If necessary, press Mode to make it read Manual.
•Press Rain Clutter to activate the control.
•If necessary, press Rain Clutter again to make it read Manual.
•Press 0 twice on the keypad to set the rain clutter value to zero.
•Press Sea Clutter.
•Press 0 twice on the keypad to set the sea clutter value to zero.
•Press Gain to activate the control.
•If necessary, press Gain again to make it read Manual.
•Press 1, 5, and 0 on the keypad to set the gain to 150.
•Press Return and Done to return to the main radar screen.
¾Next, set the scale to 1/8 nautical miles as follows:
•Press zoom Range - several times to access the 1/8 nautical miles scale. (The current scale is shown in the upper left corner of the screen, identified as "RNG").
•From the main radar page, press Page 2, Page 3, Page 4, and Install... .
•Press Tune... to display the tuning screen.
•Press Tune Mode (repeatedly if necessary) to set it to Manual.
•Set the rough tune value to 128 (if necessary) by selecting Tune Preset and typing 128 on the keypad.
•Press Tune.
•Adjust the tune preset value upwards by pressing the up arrow key on the cursor pad until the quantity and strength of visible targets is maximized.
•If the quantity and strength of targets does not increase, return to 128 by typing 128. Then adjust the tune preset value upwards by pressing the down arrow key on the cursor pad until the quantity and strength of visible targets is maximized.