Southern Avionics Company SD100 Manual Do Utilizador

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3.26 On the PC set Mode to Continuous

3.27 On the PC set and increase  modulation in steps from 10 to 100% verifying  a proper sinusoidal  

modulation envelope. 

3.28 With Modulation at 100%, scope the output at the Dummy load and adjust R20 CCW until the 

shutdown occurs. the Controller / Monitor should indicate a fault condition.

3.29 Back off R20  and reset the fault on the PC. Verify Modulated output returns.

3.30 Increase Modulation to 120% and adjust R20 CCW again slowly until a shutdown occurs.

3.31 On the PC adjust the Modulation to 95%, then set the Mode to IDENT.

3.32 Monitor the output for one minute and verify no faults occur

3.33 The RF Power Amplifier Alignment is complete

Safety Note:  Dangerous RF voltages are present on this PCB during power on tests. Be very careful when working 
on this board.   

1.0

PRELIMINARY SET-UP

1.1

Verify that all ac and dc power switches are turned off 

1.2

Connect a PC to the Controller / Monitor local port with an RS232 null modem cable. 

1.3

Turn the PC on and Load and Run the Controller / Monitor USER  Software supplied with the 
System

1.4

Remove the Filter/Bridge PCB from the RF Section and place it on an extender fixture

1.5

Adjust R7 and R11 fully CW

1.6

Set jumper JP13 and  JP14 to B

1.7

Set jumpers  JP1 thru JP12 according to the Frequency Band Chart on the Filter/Bridge Schematic 
(SEP10002 / 0x ) sheet 1 of 3. 

2.0

POWER BRIDGE BALANCE 

2.1

Turn The Main AC power switch ON 

2.2

Turn the Controller / Monitor AC distribution switch ON

2.3

Turn the Transmitter (1 or 2) AC distribution switch ON

2.4

On the PC screen Click on OPEN PORT 

2.5

Click on ID CONFIG and set up for the proper Site RF frequency and Tone

2.6

Click on Power ON and observe the HV lamp on the PAPS comes on

2.7

Click on Control  and when the window opens select CARRIER MODE

2.8

Set the Carrier Power level to 25 watts