Tuning Adjustment; Antenna Height Set Up - JRC JMA-3400 Series Instruction Manual

7.4 TUNING ADJUSTMENT

The physical dimensions of the magnetron tube in the transmitter dictate the precise transmitter output
frequency of the particular set.
The tuning function control fine-tunes the receiver circuits to match their maximum sensitivity to that
transmitted signal. Tuning adjustment is necessary for maintaining a high performance.
But the tuning adjustment had been already set at the factory. This adjustment value should not be changed
greatly when started up the radar at first.
Select Tune Adjustment.

7.5 ANTENNA HEIGHT SET UP

Set up the antenna height.
This set up is related to sea clutter rejection control.
At a short range, sea clutter level is proportion to the height of the scanner.
Thus, an optimum sea clutter rejection constant must be selected according with the height of antenna.
Select "Antenna Height."
MULTI control or cross key
change the value.
Select an appropriate antenna height.
Chapter 7 INITIAL SETTINGS
Adjust the tuning adjustment bar
to more than 8 scales.
Tune Adjustment bar
137