Nautel Vector-LP VR125 - 3.6.15 Viewing Power Related Parameters and Setting ATU Current Feedback

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Page 3-36 Vector-LP Radio Beacon Transmitter Technical Instruction Manual

Issue 1.1 Section 3 Operating Instructions

3.6.15 Viewing Power Related

Parameters and Setting ATU

Current Feedback

View the transmitter’s power menu and, if

necessary, set the status of the ATU

current feedback circuit as follows:

NOTE

The ATU current feedback circuit attempts

to regulate the antenna current over a

range of RF output power. The two ATU

options in the power menu are only

available when the transmitter is attached

(using a RS485 serial link) to an ATU-LP or

ATU500.

(a) From the meter screen, press Power.

The current forward power, reflected

power, carrier reference, VSWR,

antenna current, B+ voltage (for the

active side’s power supply) and dc

current (for the active side’s power

supply).

(b) To edit the Fwd. Power or ATU

Current Feedback field, press Modify

and then use f and g to edit:

x Fwd. Power changes in 1 W steps

x ATU Current Feedback toggles

between ON and OFF.

(Not used for ATU500)

NOTE

The transmitter regulates the antenna

current to the ATU Current Setpoint value

displayed on the GUI. Ensure the

transmitter’s RF output is set to the desired

level before setting the ATU Current

Feedback field to ON.

Forward Power: 0W

0 600 1200

Reflec. Power: 0.0W

0 100 200

VSWR: 1.00

01 2

Main Menu Status Power

12:43:16 Power: 0W Side A Bypass

Forward Power: 0W

0 600 1200

Reflec. Power: 0.0W

0 100 200

VSWR: 1.00

01 2

Main Menu Status Power

12:43:16 Power: 0W Side A Bypass12:43:16 Power: 0W Side A Bypass

Fwd. Power : 108W Rfld.Power: 0.0W

Carr. Ref: 59 VSWR: 1.00

Ant. Curr. : 1.8A B+ Volt A: 75.2V

DC Curr A: 0.70A

ATU Current Feedback: OFF

ATU Current Setpoint: 1.8

Main Menu Modify Meters