Operation; The Following Is For The Jumpers In The Junction Box. (Setting 1); The Following Is For The Jumpers In The Junction Box. (Setting 2) - JRC RADAR 1800 Instruction Manual

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Operation

The following is for the jumpers in the junction box. (Setting 1)

TB1 = 1 - 2, TB2 1 - 2
Display unit 1 and display unit 2 can alternately use the antenna each time
they are turned ON, whichever display unit is already ON is turned OFF.
Example:
Turning ON display unit 2 while display unit 1 is ON turns OFF the power
to display unit 1. After display unit 2 has been running for 1 minute and 30
seconds the magnetron is finished pre-heating, allowing it to use the antenna for
transmission.
In the same way, turning ON display unit 1 while display unit 2 is ON turns
OFF the power to display unit 2, allowing it to use the antenna.

The following is for the jumpers in the junction box. (Setting 2)

TB1 = 1 - 2, TB2 = 2 - 3
The power to display unit 1 stays on even when the power to display unit 2 is
turned ON.
However, access to the antenna is given to display unit 2 if display unit 2 is
turned ON.
When display unit 2 is turned ON, and display unit 1's power is turned ON,
the power of display unit 2 is automatically turned OFF, and display unit 1 is
allowed access to the antenna.
Example:
Display unit 1, which is normally ON and used when underway, from
departure to arrival, also provides the electric power to operate the GPS receiver, it
is used to store and display the ship's route.
By turning ON display unit 1, while display unit 2 is operating, display unit
2's power can be turned OFF, and display unit 1 gets priority access to the
antenna.
By turning ON display unit 2 while display unit 1 is transmitting, because
the priority access to the antenna moves from display unit 1 to display unit 2 an
antenna rotation error (BZ error) occurs at display unit 1.
Therefore, to turn ON display unit 2's power, first put display unit 1 into
standby, then put display unit 1 into standby status, and then turn ON display
unit 2.