1. OPERATION
1-6
1.7
Tuning the Receiver
The radar receiver can be tuned automatically or manually, and the default tuning
method is automatic.
1.7.1
Automatic tuning
In automatic tuning, the radar is automatically tuned every time the radar is
switched to transmit. The tuning indicator and the indication AUTO at the top right
corner show the tuning circuit is working. Generally, the longer the tuning bar the
better the tuning condition, however the length of the bar changes with number of
radar echoes, range and other factors. The receiver may become detuned in
automatic tuning. To re-tune, press the [STBY/TX] key twice.
HDG 234.5
˚
HUP RM
SP
. 125
KM
0.025
Tuning bar
AUTO
Tuning method
(AUTO or MANUAL)
Figure 1-6 Tuning bar
1.7.2
Manual tuning
If you require manual tuning do the following:
1. Press the [MENU] key to display the main menu.
2. Use the trackball to select OTHER MENU and press the [ENTER] key.
3. Use the trackball to select the item “9. Tune.”
4. Select the option Manual followed by the [ENTER] key.
5. While pressing and holding down the [GAIN] control, operate the trackball to
show the longest tuning bar possible.
6. Press the [MENU] key to close the menu.
1.8
Selecting a Range
The range selected automatically determines the range ring interval, the number
of range rings and pulse repetition rate, for optimal detection capability in short to
long ranges. You can select which ranges and pulselength (for 3 and 6 kilometer
ranges) to use through the OTHER menu. The range, range ring interval and
pulselength appear at the top left-hand corner of the display for your confirmation.
Press the [RANGE] key. Each time the range is changed the newly selected
range appears momentarily at the center of the display for your confirmation.
Range is always displayed at the top left corner on the screen.
Summary of Contents for FR-7041R-MARK-2
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