Tuning Adjustment - JRC JMA-3400 Series Instruction Manual

Range unit is using the NM in marine radar usually. (1 NM = 1,852 m).
Before adjustment
Select a target which range is already known.
Procedure
(1) Radar is set to TX mode.
(2) Adjust GAIN, RAIN and SEA to find the known target on the screen.
(3) Adjust the range on the radar to match to the range of the target described in "Before adjustment."
① Select "Range Adjustment."

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.
① Select "Tune Adjustment."
② MULTI control or cross key
change the value.
①
Known target
② MULTI control or cross key
change the value.
Chapter 7 INITIAL SETTINGS
③ Adjust the value so that
the known target is on the set VRM.
Known target
③ Adjust the tuning adjustment bar
to more than 8 scales.
Tune Adjustment bar
131