Marti Electronics SRPT-30 User Manual page 50

14. Depress and release the front panel EXECUTE pushbutton switch. This command will disable VSWR Foldback.
15. Set the front panel FREQUENCY SELECT pushwheel switches as follows:
DECIMAL 7 (far left digit) = "1"
DECIMAL 6 = "0"
DECIMAL 5 = "4"
DECIMAL 4 = "0"
DECIMAL 3 = "1"
DECIMAL 2 = "0"
DECIMAL 1 (far right digit) = "0"
16. Depress and release the front panel EXECUTE pushbutton switch. The SRPT-40A is now in the Forward Power
Calibration mode.
17. On the FRONT PANEL CONTROL & METER board, adjust S1 dip-switches with switch 1, 2, and 4 "OFF" and
switch 3 "ON".
18. Set the front panel FREQUENCY SELECT pushwheel switches as follows:
DECIMAL 7 (far left digit) = "1"
DECIMAL 6 = "any number"
DECIMAL 5 = "any number"
DECIMAL 4 = "any number"
DECIMAL 3 = "any number"
DECIMAL 2 = "any number"
DECIMAL 1 (far right digit) = "any number"
19. Depress and release the front panel EXECUTE pushbutton switch. This command will set the internal power control
pot to maximum and the position of the POWER ADJUST pot is ignored.
20. Put the TRANSMIT/STANDBY switch in the "TRANSMIT" position. The output power (as indicated by the
WATT METER) should be close to 0 Watts.
THE HIGH VSWR LED MAY BLINK FROM TIME TO TIME, BUT SIMPLY IGNORE IT DURING
21. The front panel TRANSMIT LED should be off. On the SYNTHESIZER, tweak the MAX PWR pot (R74)
clockwise until the TRANSMIT LED just comes on. The output power should increase as indicated by the WATT
METER.
22. Referring to Table (2) - Forward and Reverse Power Calibration, on the TWO-STAGE POWER AMPLIFIER
board, tweak the FP CAL pot (R20) counter-clockwise (slowly) until the output power (as indicated by the WATT
METER) reaches the FWD CAL PWR LEVEL corresponding to your model.
23. On the SYNTHESIZER, tweak the MAX PWR pot (R74) to the desired maximum output power, but do not exceed
the Maximum RF Output Power as specified under ORDERING INFORMATION corresponding to your model.
Notice that this Maximum RF Output Power is slightly less than the FWD CAL PWR LEVEL.
24. On the FRONT PANEL CONTROL & METER board, adjust S1 dip-switches with switch 1, 3, and 4 "OFF" and
switch 2 "ON".
NOTE
THIS CALIBRATION PROCEDURE.
WARNING
THE FP CAL POT (R20) IS NOW CALIBRATED.
DO NOT ADJUST IT ANYMORE!
8/7/2003
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