Raymarine Marine GPS System - Manual (Page 109)

RayTech Navigator User’s Guide
5-18
Tuning the Receiver
The TUNE control is used to fine-tune the receiver in the scanner for
maximum target returns on the display. In Auto mode, the radar tunes
itself automatically on all range scales. Raymarine recommends
that you leave the TUNE control in Auto mode.
If you set the TUNE control to Manual, you will need to adjust it
about 10 minutes after you have turned on the radar, since the required
setting changes after the magnetron has warmed up.
Adjust the control to obtain the maximum signal strength, as indicated
in the 8-step signal strength bar above the slider.
To tune the radar:
1. Select a range appropriate to the adjustment you want to
make. The optimum Tune setting varies slightly for
different ranges, depending on the pulse width used.
2. On the Pathfinder Panel, click the MULTI button.
3. Press the TUNE button. The button toggles the control
between Auto and Manual mode.
4. Select Manual mode to display the arrow control buttons
and signal-strength meter. Use the up/down arrows to
increase/decrease the Manual TUNE adjustment to obtain
the maximum reading on the meter. Important: Because
the changes to the settings are made immediately, you
cannot revert to the previous setting by clicking
CLEAR .
5. When you have set the controls to the levels you require,
click ENTER , CLEAR , or BACK to return to the default
menu level of the Functionbar.